Method for correcting a photon counting imaging device detector and photon counting imaging device detector

Abstract

This invention relates to the field of medical device technology, and discloses a calibration method for a detector in a photon counting imaging device, a photon counting imaging device detector, and a storage medium. The photon counting imaging device detector includes a pixel acquisition integrated circuit, a data processing unit, and a storage unit. First, after receiving an instruction to perform electronic calibration, the data processing unit reads initial electronic calibration configuration information from the storage unit and sends it to the pixel acquisition integrated circuit. Then, the pixel acquisition integrated circuit receives the initial electronic calibration configuration information to execute the electronic calibration process, obtains raw data, and transmits it to the data processing unit. Finally, the data processing unit receives the raw data and performs data processing to obtain updated electronic calibration configuration information, which is stored in the storage unit. Both data processing and parameter updating are completed within the detector, shortening the data transmission path and achieving rapid electronic calibration.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a calibration method for a detector in a photon counting imaging device and the detector itself. Background Technology

[0002] Photon counting CT uses a detector module made of special materials to directly convert received photons into electronic signals and counts photons of different energies separately. Photon counting CT can acquire images or analytical conclusions for multiple energy ranges in a single scan.

[0003] However, due to various factors such as materials, processes, and manufacturing, the responses of different detector units to single-photon signals are not consistent, which can lead to a decrease in CT image quality. Therefore, a calibration method for the detectors of photon counting imaging devices is needed. Summary of the Invention

[0004] The embodiments described in this specification aim to at least partially solve one of the technical problems in the related art. To this end, the embodiments of this specification propose a calibration method for a detector in a photon counting imaging device and a detector for the same device.

[0005] This specification provides a calibration method for a detector in a photon counting imaging device. The detector in the photon counting imaging device includes a pixel acquisition integrated circuit, a data processing unit, and a storage unit. The method includes: After receiving the instruction to perform electronic correction, the data processing unit reads the initial electronic correction configuration information from the storage unit and sends it to the pixel acquisition integrated circuit. The pixel acquisition integrated circuit receives the initial electronic correction configuration information to execute the electronic correction process, obtains raw data, and transmits it to the data processing unit. The data processing unit receives the raw data and processes it to obtain updated electronic calibration configuration information, wherein the updated electronic calibration configuration information is stored in the storage unit.

[0006] In one embodiment, the pixel acquisition integrated circuit receives the initial electronic correction configuration information to perform an electronic correction process, obtains raw data, and transmits it to the data processing unit, including: After receiving the initial electronic correction configuration information, the pixel acquisition integrated circuit enters the test configuration state and generates a standard test excitation signal. The pixel acquisition integrated circuit uses the initial electronic correction configuration information to correct and count the standard test excitation signal, obtain the raw data, and transmit it to the data processing unit.

[0007] In one embodiment, the data processing unit receives the raw data and performs data processing to obtain updated electronic calibration configuration information, including: The data processing unit performs data fitting based on the original data and the preset correction model to obtain the updated electronic correction configuration information.

[0008] In one embodiment, the photon counting imaging device detector further includes an image preprocessing and transmission unit and a plurality of front-end detector modules, each of the front-end detector modules including the pixel acquisition integrated circuit, the data processing unit being disposed in the image preprocessing and transmission unit or each of the front-end detector modules, and the storage unit being disposed in the image preprocessing and transmission unit or each of the front-end detector modules.

[0009] In one embodiment, the method includes: Update the electronic calibration configuration information in the pixel acquisition integrated circuit; The scan electrical signal is electronically calibrated using the updated electronic calibration configuration information to obtain scan data; Based on the scan data, image reconstruction is performed to obtain medical images.

[0010] This specification provides a detector for a photon counting imaging device, which includes a pixel acquisition integrated circuit, a data processing unit, and a storage unit. The data processing unit is used to receive the instruction to perform electronic correction, read the initial electronic correction configuration information from the storage unit, and send it to the pixel acquisition integrated circuit. The pixel acquisition integrated circuit is used to receive the initial electronic correction configuration information to execute the electronic correction process, obtain raw data, and transmit it to the data processing unit; The data processing unit is used to receive the raw data and perform data processing to obtain updated electronic calibration configuration information, wherein the updated electronic calibration configuration information is stored in the storage unit.

[0011] In one embodiment, the photon counting imaging device detector further includes multiple front-end detector modules, each of which includes the pixel acquisition integrated circuit, the data processing unit, and the storage unit.

[0012] In one embodiment, the photon counting imaging device detector further includes an image preprocessing and transmission unit and a plurality of front-end detector modules, each of the front-end detector modules including the pixel acquisition integrated circuit, the data processing unit being disposed in the image preprocessing and transmission unit or each of the front-end detector modules, and the storage unit being disposed in the image preprocessing and transmission unit or each of the front-end detector modules.

[0013] In one embodiment, the photon counting imaging device detector further includes a computed tomography (CT) console, a CT fixed-end control unit, and a CT rotating end control unit. The CT console is used to issue instructions to perform electronic correction. The instructions to perform electronic correction are issued from the CT console and sequentially pass through the CT fixed-end control unit, the CT rotating end control unit, and the image preprocessing and transmission unit before being transmitted to the data processing unit.

[0014] This specification provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method described in any of the above embodiments.

[0015] This specification provides a computer program product that includes instructions that, when executed by a processor of a computer device, enable the computer device to perform the steps of the method described in any of the above embodiments.

[0016] In the above-described embodiment, the photon counting imaging device detector includes a pixel acquisition integrated circuit, a data processing unit, and a storage unit. Initial electronic calibration configuration information is pre-stored in the storage unit. First, after receiving the instruction to perform electronic calibration, the data processing unit reads the initial electronic calibration configuration information from the storage unit and sends it to the pixel acquisition integrated circuit. Then, the pixel acquisition integrated circuit receives the initial electronic calibration configuration information to execute the electronic calibration process, obtains raw data, and transmits it to the data processing unit. Finally, the data processing unit receives the raw data and processes it to obtain updated electronic calibration configuration information, which is stored in the storage unit. On the one hand, the data processing unit directly reads and sends the initial electronic calibration configuration information from the detector's internal storage unit, eliminating the need for the CT console, significantly shortening the parameter sending link and saving time for the CT console to send electronic calibration configuration parameters. On the other hand, both data processing and parameter updating are completed within the detector, eliminating the need to upload electronic calibration data to the CT console for processing, shortening the data transmission path, saving data transmission time and processing time, thereby achieving rapid electronic calibration. Attached Figure Description

[0017] Figure 1 A schematic diagram illustrating the calibration process of the detector in the photon counting imaging device provided in this specification. Figure 2 A flowchart illustrating the process of obtaining raw data provided for the embodiments of this specification; Figure 3 A schematic diagram illustrating the process of obtaining medical images provided for embodiments of this specification; Figure 4 A schematic diagram of a detector for a photon counting imaging device provided for embodiments of this specification; Figure 5 A schematic diagram of a detector for another photon counting imaging device provided for embodiments of this specification; Figure 6 This is a schematic diagram of a calibration device for a detector in a photon counting imaging device provided in an embodiment of this specification. Detailed Implementation

[0018] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0019] Photo-counting CT (PCCT) uses a detector module (DM) made of special materials (such as cadmium zinc telluride, cadmium telluride, etc.) to directly convert received photons into electronic signals and count photons of different energies separately. PCCT can acquire images or analytical conclusions from multiple energy ranges in a single scan. Compared to traditional CT, it can reduce the radiation dose received by the patient, and the multi-energy dimension analysis can better describe the disease.

[0020] However, due to various factors such as materials, processes, and manufacturing, the responses of different detector units to single-photon signals are not consistent, leading to a decline in CT image quality. Therefore, electronic calibration of all detector units in a PCCT machine is necessary to ensure consistent electronic characteristics across all channels, thereby improving image quality. After assembly and during actual use, deviations in the electronic characteristics of the detectors in a photon-counting CT scanner accumulate over time, requiring periodic electronic calibration to correct these deviations.

[0021] Electronic calibration is a complex process involving numerous links, large amounts of data transmission, and long processing times. In related technologies, during electronic calibration, the computed tomography (CT) console needs to send electronic calibration configuration parameters to the front-end detector module. The link path is: CT console >> CT fixed-end control unit >> CT rotating-end control unit >> image preprocessing and transmission unit >> front-end detector module. After the front-end detector module performs electronic calibration according to the configuration parameters, it then uploads the electronic calibration data to the CT console for processing. The upload link path is: front-end detector module >> image preprocessing and transmission unit >> CT rotating-end control unit >> CT fixed-end control unit >> CT console.

[0022] Photon-counting CT scanners have dozens of front-end detector modules, and the electronic calibration of these detectors includes various types (such as capacitance consistency electronic calibration, digital quantizer consistency electronic calibration, etc.). Each type of electronic calibration requires the complete download and upload process described above, making the entire electronic calibration process time-consuming; a single complete electronic calibration often takes tens of hours. Considering that the entire PCCT machine needs to undergo electronic calibration at fixed intervals, this severely impacts the effective working time of the CT equipment.

[0023] Based on this, this specification provides a calibration method for a detector in a photon counting imaging device. The photon counting imaging device detector includes a pixel acquisition integrated circuit, a data processing unit, and a storage unit. Initial electronic calibration configuration information is pre-stored in the storage unit. First, after receiving an instruction to perform electronic calibration, the data processing unit reads the initial electronic calibration configuration information from the storage unit and sends it to the pixel acquisition integrated circuit. Then, the pixel acquisition integrated circuit receives the initial electronic calibration configuration information to execute the electronic calibration process, obtains raw data, and transmits it to the data processing unit. Finally, the data processing unit receives the raw data and performs data processing to obtain updated electronic calibration configuration information, which is stored in the storage unit. On the one hand, the data processing unit directly reads and sends the initial electronic calibration configuration information from the storage unit inside the detector, without the need for the CT console, significantly shortening the parameter sending link and saving time for the CT console to send electronic calibration configuration parameters. On the other hand, both data processing and parameter updating are completed inside the detector, eliminating the need to upload electronic calibration data to the CT console for processing, shortening the data transmission path, saving data transmission time and processing time, thereby achieving rapid electronic calibration.

[0024] This specification provides a calibration method for the detector of a photon counting imaging device. Please refer to [link to relevant documentation]. Figure 1The detector of the photon counting imaging device includes a pixel acquisition integrated circuit, a data processing unit, and a storage unit; the calibration method of the detector of the photon counting imaging device may include the following steps: S110: After receiving the instruction to perform electronic correction, the data processing unit reads the initial electronic correction configuration information from the storage unit and sends it to the pixel acquisition integrated circuit.

[0025] The electronic calibration configuration information includes process control parameters and reference calibration parameters. Process control parameters configure the hardware execution logic of the pixel acquisition integrated circuit, including but not limited to key control fields such as the calibration sequence register, averaging count register, and initial / termination column register. These fields specify the order of each calibration step, the cumulative average number of rounds of sampled data, and the starting boundary position of the effective pixel column. Reference calibration parameters are used to handle various coefficients related to the response differences of the pixel acquisition integrated circuit, such as energy threshold parameters and capacitance compensation parameters, thereby ensuring that the amplitude of the output signal after calibration tends to be consistent.

[0026] Specifically, the computed tomography (CT) control console, the CT fixed-end control unit, the CT rotating end control unit, and the image preprocessing and transmission unit are sequentially and communicatively connected to the data processing unit. The command to perform electronic correction originates from the CT control console, passes sequentially through the CT fixed-end control unit, the CT rotating end control unit, and the image preprocessing and transmission unit, and is then transmitted to the data processing unit. Upon receiving the command to perform electronic correction, the data processing unit reads the pre-stored initial electronic correction configuration information from its connected storage unit and then sends the read initial electronic correction configuration information to the pixel acquisition integrated circuit.

[0027] S120: The pixel acquisition integrated circuit receives the initial electronic correction configuration information to execute the electronic correction process, obtains the raw data, and transmits it to the data processing unit.

[0028] Specifically, the pixel acquisition integrated circuit receives and loads the initial electronic calibration configuration information, and uses these parameters to configure the electronic calibration process for each of its channels. Subsequently, the pixel acquisition integrated circuit performs a test configuration state, and uses the initial electronic calibration configuration information to execute the electronic calibration process on the electrical signals obtained in the test, obtains the raw data, and transmits the raw data to the data processing unit.

[0029] It should be noted that the raw data is not the final result after complete or precise correction, but rather the digitized result of electrical signals obtained after applying only the initial correction parameters, still retaining the current non-ideal characteristics of each channel of the chip (such as inconsistent offset, noise, nonlinear response, etc.). This raw data is then transmitted to the data processing unit for further fine correction.

[0030] S130, The data processing unit receives the raw data and processes it to obtain updated electronic calibration configuration information.

[0031] The updated electronic calibration configuration information is stored in the storage unit.

[0032] Specifically, after receiving the raw data, the data processing unit, with the goal of "achieving consistency in the electronic characteristics of each channel," inputs this raw data into a preset calculation model to calculate the correction coefficients required by the pixel acquisition integrated circuit to achieve this desired consistency value. This data processing process obtains updated electronic correction configuration information, which is then stored in the storage unit.

[0033] It should be noted that in the electronic calibration process, regardless of which calibration operation is being performed to update the electronic calibration configuration information, each time the system is executed, it can either read the pre-saved initial electronic calibration configuration information from the storage unit and use it as the reference for the current calibration, or it can read the updated electronic calibration configuration information that has been obtained and saved in the previous calibration process and use it as the reference for the current calibration.

[0034] In the above embodiment, the photon counting imaging device detector includes a pixel acquisition integrated circuit, a data processing unit, and a storage unit. Initial electronic calibration configuration information is pre-stored in the storage unit. First, after receiving the instruction to perform electronic calibration, the data processing unit reads the initial electronic calibration configuration information from the storage unit and sends it to the pixel acquisition integrated circuit. Then, the pixel acquisition integrated circuit receives the initial electronic calibration configuration information to execute the electronic calibration process, obtains raw data, and transmits it to the data processing unit. Finally, the data processing unit receives the raw data and performs data processing to obtain updated electronic calibration configuration information, which is stored in the storage unit. On the one hand, the data processing unit directly reads and sends the initial electronic calibration configuration information from the storage unit inside the detector, without the need for the CT console, significantly shortening the parameter sending link and saving time for the CT console to send electronic calibration configuration parameters. On the other hand, both data processing and parameter updating are completed inside the detector, eliminating the need to upload electronic calibration data to the CT console for processing, shortening the data transmission path, saving data transmission time and processing time, thereby achieving the effect of rapid electronic calibration.

[0035] In some implementations, please refer to Figure 2 The pixel acquisition integrated circuit receives initial electronic correction configuration information to execute the electronic correction process, obtains raw data, and transmits it to the data processing unit, which may include the following steps: S210: After receiving the initial electronic correction configuration information, the pixel acquisition integrated circuit enters the test configuration state and generates a standard test excitation signal.

[0036] The S220 pixel acquisition integrated circuit uses the initial electronic calibration configuration information to calibrate and count the standard test excitation signal, obtain the raw data, and transmit it to the data processing unit.

[0037] The standard test excitation signal types include analog electrical signals or analog photon detector signals, which can be generated by methods such as X-ray tube wiring to simulate the detector's response under real working conditions.

[0038] Specifically, the signal generation circuit inside the pixel acquisition integrated circuit generates a standard test excitation signal with specific amplitude, frequency, and waveform characteristics according to a preset test mode. Then, the pixel acquisition integrated circuit calls upon the received initial electronic calibration configuration information to perform calibration processing on the standard test excitation signal, and performs pulse counting or period counting operations on the calibrated signal to obtain raw data without further parsing or conversion. Finally, the pixel acquisition integrated circuit transmits the obtained raw data to the data processing unit for subsequent parameter update processing.

[0039] It should be noted that, in order to ensure good robustness of subsequent processing, the pixel acquisition integrated circuit needs to continuously acquire the above raw data over a continuous time interval. That is, by acquiring the counting results within a sufficiently long window, subsequent parameter updates can be based on statistically stable samples, thereby improving the anti-interference capability and consistency of the correction process.

[0040] In the above embodiments, after receiving the initial electronic calibration configuration information, the pixel acquisition integrated circuit enters the test configuration state and generates a standard test excitation signal. The pixel acquisition integrated circuit uses the initial electronic calibration configuration information to perform calibration and counting processing on the standard test excitation signal, obtains the raw data, and transmits it to the data processing unit to provide a data basis for subsequent data processing, so as to obtain updated electronic calibration configuration information that is more in line with the actual situation.

[0041] In some implementations, the data processing unit receives raw data and processes it to obtain updated electronic calibration configuration information. This may include: the data processing unit performing data fitting based on the raw data and a preset calibration model to obtain updated electronic calibration configuration information.

[0042] In some cases, unavoidable minor variations in the manufacturing process of pixel acquisition integrated circuits, such as discrete distributions of transistor threshold voltage, capacitance values, or interconnect resistances, can cause the output voltage values ​​of each pixel unit to remain inconsistent, even when the input physical signal is perfectly uniform. This manifests as spatially fixed, non-uniform noise that appears frame-by-frame in the image. To eliminate this noise, the obtained electronic correction configuration information can be used to correct each pixel acquisition integrated circuit, making the output response of each pixel acquisition integrated circuit more consistent.

[0043] Specifically, in the calibration process of the pixel acquisition integrated circuit (ASIC), different electronic calibration configuration information corresponds to different preset calibration models, and each preset calibration model contains its own unique processing flow. After obtaining the raw data without further parsing or transformation, the data processing unit combines it with the currently used preset calibration model and continuously optimizes the electronic calibration configuration information through a data fitting algorithm. In each round of data fitting, the data processing unit adjusts the coefficients or parameter values ​​in the model based on the residual between the output under the current calibration parameters and the expected target until the convergence condition is met, thereby obtaining updated electronic calibration configuration information that makes the output response of each pixel unit tend to be consistent. The data fitting processing operation includes at least one of iterative fitting, nonlinear fitting, and machine learning fitting.

[0044] It should be noted that, in order to improve the robustness of the calibration process, this embodiment continuously acquires the aforementioned raw data within a continuous time interval, that is, it acquires the corresponding updated electronic calibration configuration information at multiple different acquisition time points for the same calibration process. Then, by fitting these multiple updated electronic calibration configuration information obtained within the continuous time interval (e.g., using mathematical methods such as linear regression or polynomial fitting), a more accurate and stable final updated electronic calibration configuration information is obtained, thereby further suppressing random noise or fluctuations introduced by single or short-term acquisition and improving calibration accuracy.

[0045] In some implementations, the preset correction model can be flexibly designed according to actual needs and signal characteristics. For example, some models may first screen the raw data output by the pixel unit, removing abnormal data points caused by transient interference or saturation distortion. Next, the retained data is smoothed and filtered to suppress high-frequency random noise. Subsequently, methods such as polynomials or spline functions are used to compensate and fit the filtered data, thereby correcting the nonlinear response introduced by process deviations. Finally, the bias or gain coefficient of each pixel unit relative to the ideal response curve is calculated.

[0046] In the above embodiments, the data processing unit performs data fitting based on the original data and the preset correction model to obtain updated electronic correction configuration information. After such correction, the fixed pattern noise caused by system hardware inconsistency is significantly suppressed or completely eliminated, and the final output image has a uniform background and a higher signal-to-noise ratio, thereby effectively improving the imaging quality.

[0047] In some implementations, the reference correction parameters include at least one of dead time, threshold bias, capacitance characteristics, leakage current, signal gain correction parameters, reverse charge sharing correction parameters, pulse stacking correction parameters, and channel crosstalk correction parameters.

[0048] Specifically, dead time can be a period of non-response time artificially set during the readout or reset of the electrical signal of a pixel unit to avoid charge injection, clock feedthrough, or amplifier instability. By adjusting the dead time of each pixel unit, the inconsistency in output amplitude caused by differences in switching speed or charge transfer efficiency can be compensated, thereby making the response of each pixel tend to be consistent within the same integration period.

[0049] Threshold bias can be a DC bias correction amount superimposed on the discrete distribution of the inherent threshold voltage of the transistor within each pixel unit. This bias amount counteracts the threshold voltage drift caused by process variations by changing the transistor's turn-on start point or subthreshold slope, ensuring that the transconductance or turn-on current of each pixel unit remains consistent under the same input signal.

[0050] By adjusting the capacitor characteristics, it is possible to correct signal gain differences or charge storage nonlinearities caused by capacitor manufacturing deviations, ensuring that the charge-voltage conversion coefficients of each pixel unit are uniform.

[0051] Leakage current can be the dark current or surface leakage current of nodes such as photodiodes, reset transistors, or transmission gates in a pixel unit under non-illuminated or no-signal conditions. By introducing independent leakage current compensation parameters for each pixel, output drift and fixed pattern noise caused by uneven leakage current distribution can be suppressed, and the output baseline of each pixel can be aligned under long-term integration or low-illumination conditions.

[0052] Signal gain correction parameters are used to compensate for gain nonuniformity in the source follower or column amplifier within each pixel unit caused by process variations, load capacitance differences, or supply voltage fluctuations. This can be achieved by assigning an independent multiplicative gain factor to each pixel, which is obtained by least-squares fitting based on the ratio of the average response across multiple frames under full-array uniform illumination to the mean of the entire array.

[0053] The anti-charge sharing correction parameter addresses the phenomenon of partial charge crosstalk to neighboring pixels during charge transfer caused by overlapping transmission gate timings or parasitic coupling. The anti-charge sharing correction parameter is an off-diagonal element of the coupling coefficient matrix, obtained by testing the charge injection response of adjacent pixel pairs and then deconvolving them.

[0054] Pulse stacking correction parameters are used in high count rate or transient signal scenarios. When multiple events arrive consecutively within the dead time, a stacking identification model is used to post-process and correct the pulse amplitude and arrival time. By monitoring the pulse rise edge interval in real time, a statistical inversion algorithm is used to separate overlapping pulses and recalculate the effective amplitude of each event, ensuring that the linearity of dose rate or flux measurement is extended to more than three times the original dynamic range.

[0055] The channel crosstalk correction parameter characterizes the signal crosstalk between parallel readout channels (including analog signal lines, clock lines, and power rails) caused by coupling capacitance and mutual inductance. A crosstalk coupling matrix is ​​constructed by applying a test signal of known frequency and amplitude to adjacent channels and measuring its leakage component in that channel. The inverse of this matrix is ​​then used to linearly decouple the readout values ​​of each channel, eliminating artifacts and periodic noise introduced by crosstalk, thereby improving the signal-to-noise ratio and reconstruction uniformity of image or projection data.

[0056] In some implementations, the photon counting imaging device detector also includes multiple front-end detector modules, each of which includes a pixel acquisition integrated circuit, a data processing unit, and a storage unit.

[0057] Specifically, to shorten the data transmission link, this embodiment adds a data processing unit and a storage unit inside the front-end detector module. With this configuration, the raw electrical signal acquired by the pixel acquisition integrated circuit no longer needs to pass sequentially through the image preprocessing and transmission unit, the computed tomography (CT) rotating end control unit, and the CT fixed end control unit before finally being transmitted to the CT console for data processing to obtain updated electronic correction configuration information. Instead, the updated electronic correction configuration information can be obtained directly through the data processing unit. Simultaneously, it is no longer necessary for the CT console to send the updated electronic correction configuration information in reverse, sequentially passing through the CT fixed end control unit, the CT rotating end control unit, and the image preprocessing and transmission unit before being transmitted back to the front-end detector module for the configuration of the pixel acquisition integrated circuit. Instead, the updated electronic correction configuration information is directly stored in the storage unit, and when configuring the pixel acquisition integrated circuit, the updated electronic correction configuration information is directly retrieved from the storage unit.

[0058] In the above embodiments, by means of the data processing unit and storage unit integrated inside the front-end detector module, the necessary calibration parameters can be updated and stored directly on the module, thereby avoiding the round-trip transmission of calibration parameters in long links, significantly reducing data transmission latency, shortening data transmission path, saving data transmission time and processing time, and thus achieving the effect of rapid electronic calibration.

[0059] In some embodiments, the photon counting imaging device detector further includes an image preprocessing and transmission unit and multiple front-end detector modules, each front-end detector module including a pixel acquisition integrated circuit, a data processing unit disposed in the image preprocessing and transmission unit or each front-end detector module, and a storage unit disposed in the image preprocessing and transmission unit or each front-end detector module.

[0060] Specifically, the photon counting imaging device detector also includes an image preprocessing and transmission unit and multiple front-end detector modules, each of which contains a pixel acquisition integrated circuit. To shorten the data transmission link, the data processing unit can be located in the image preprocessing and transmission unit or in each front-end detector module. Similarly, the storage unit can also be located in the image preprocessing and transmission unit or in each front-end detector module. Therefore, the deployment locations of the data processing unit and storage unit can be flexibly combined to form various optional configuration architectures.

[0061] In other words, the data processing unit and storage unit can be integrated into the image preprocessing and transmission unit, allowing the front-end detector module to maintain a relatively simple structure. The signal output from the pixel acquisition integrated circuit is directly transmitted to the data processing unit inside the image preprocessing and transmission unit for data processing to obtain the updated electronic correction configuration information. Simultaneously, the updated electronic correction configuration information is transmitted to the storage unit inside the image preprocessing and transmission unit for storage, and is retrieved from the storage unit when configuring the pixel acquisition integrated circuit.

[0062] Alternatively, the data processing unit and storage unit can be located in each front-end detector module. The signal output by the pixel acquisition integrated circuit can be directly processed by the data processing unit to obtain the updated electronic correction configuration information. Simultaneously, the updated electronic correction configuration information is directly stored in the storage unit and retrieved directly from the storage unit when configuring the pixel acquisition integrated circuit.

[0063] Alternatively, a hybrid configuration can be used, where the data processing unit is located in the image preprocessing and transmission unit, and the storage unit is located in each front-end detector module. Or, the data processing unit can be located in each front-end detector module, and the storage unit in the image preprocessing and transmission unit. The signal output from the pixel acquisition integrated circuit does not need to sequentially pass through the computed tomography (CT) rotating end control unit and the CT fixed end control unit before finally being transmitted to the CT console for data processing to obtain updated electronic correction configuration information. Instead, the raw electrical signal can be transmitted directly to the data processing unit for data processing to obtain the updated electronic correction configuration information. Simultaneously, the updated electronic correction configuration information is directly stored in the storage unit and retrieved directly from the storage unit when configuring the pixel acquisition integrated circuit.

[0064] In some embodiments, to shorten the data transmission link, this specific embodiment can add a data processing unit and a storage unit inside the image preprocessing and transmission unit. With this configuration, the raw electrical signal acquired by the detector no longer needs to pass sequentially through the image preprocessing and transmission unit, the computed tomography (CT) rotating end control unit, and the CT fixed end control unit before finally being transmitted to the CT console for data processing to obtain updated electronic correction configuration information. Instead, the raw electrical signal can be transmitted directly to the data processing unit within the image preprocessing and transmission unit to obtain the updated electronic correction configuration information. Simultaneously, it is no longer necessary for the CT console to send the updated electronic correction configuration information in reverse, sequentially passing through the CT fixed end control unit, the CT rotating end control unit, and the image preprocessing and transmission unit before being transmitted back to the front-end detector module for pixel acquisition integrated circuit configuration. Instead, the updated electronic correction configuration information is transmitted to the storage unit within the image preprocessing and transmission unit for storage, and is retrieved from the storage unit when configuring the pixel acquisition integrated circuit.

[0065] By utilizing the data processing and storage units integrated within the image preprocessing and transmission unit, the round-trip transmission of correction parameters in long links is avoided, significantly reducing data transmission latency, shortening data transmission paths, and saving data transmission and processing time, thereby achieving the effect of rapid electronic correction.

[0066] In the above embodiments, the photon counting imaging device detector further includes an image preprocessing and transmission unit and multiple front-end detector modules. Each front-end detector module includes a pixel acquisition integrated circuit. A data processing unit is disposed in the image preprocessing and transmission unit or each front-end detector module, and a storage unit is disposed in the image preprocessing and transmission unit or each front-end detector module. This shortens the data transmission path, saves data transmission time and processing time, thereby achieving the effect of rapid electronic correction.

[0067] In some implementations, please refer to Figure 3 The method may also include the following steps: S310, Update the electronic calibration configuration information in the pixel acquisition integrated circuit.

[0068] S320: Electronically calibrate the scanning electrical signal using updated electronic calibration configuration information to obtain scanning data.

[0069] S330: Reconstruct images based on scan data to obtain medical images.

[0070] Specifically, the updated electronic calibration configuration information is first configured into the pixel acquisition integrated circuit, which can load these parameters in real time. Then, the front-end detector performs a scan, acquiring the raw scan electrical signal. Next, the pixel acquisition integrated circuit uses these parameters to perform electronic calibration on the scan electrical signal output from the front-end detector to eliminate or compensate for electronic noise, channel inconsistencies, and other nonlinear distortions, thereby obtaining calibrated scan data. Finally, the acquired scan data is transmitted to the image reconstruction module, which performs image reconstruction according to the corresponding reconstruction algorithm, thereby generating medical images for clinical diagnosis or analysis.

[0071] In the above embodiments, the updated electronic calibration configuration information is configured in the pixel acquisition integrated circuit, and the scan electrical signal is electronically calibrated using the updated electronic calibration configuration information to obtain scan data. Based on the scan data, image reconstruction is performed to obtain a more accurate medical image.

[0072] This specification provides a detector for a photon counting imaging device, which includes a pixel acquisition integrated circuit, a data processing unit, and a storage unit. The data processing unit receives the instruction to perform electronic correction, reads the initial electronic correction configuration information from the storage unit, and sends it to the pixel acquisition integrated circuit. The pixel acquisition integrated circuit is used to receive initial electronic correction configuration information to execute the electronic correction process, obtain raw data, and transmit it to the data processing unit. The data processing unit is used to receive raw data and process it to obtain updated electronic calibration configuration information, which is stored in the storage unit.

[0073] Specifically, the computed tomography (CT) control console, the CT fixed-end control unit, the CT rotating end control unit, and the image preprocessing and transmission unit are sequentially and communicatively connected to the data processing unit. The command to perform electronic correction originates from the CT control console, passes sequentially through the CT fixed-end control unit, the CT rotating end control unit, and the image preprocessing and transmission unit, and is then transmitted to the data processing unit. Upon receiving the command to perform electronic correction, the data processing unit reads the pre-stored initial electronic correction configuration information from its connected storage unit and then sends the read initial electronic correction configuration information to the pixel acquisition integrated circuit (PIC). The IPC receives and loads the initial electronic correction configuration information, using these parameters to configure the electronic correction process for each of its channels. Subsequently, the IPC performs a test configuration state and executes the electronic correction process on the electrical signals obtained during the test using the initial electronic correction configuration information to obtain raw data, which is then transmitted to the data processing unit. After receiving the raw data, the data processing unit, with the goal of "achieving consistency in the electronic characteristics of each channel," inputs this raw data into a preset calculation model to determine the correction coefficients required by the pixel acquisition integrated circuit to achieve the desired consistency value. This data processing process obtains updated electronic correction configuration information, which is then stored in the storage unit.

[0074] In the above embodiments, the data processing unit directly reads and sends the initial electronic correction configuration information from the detector's internal storage unit, without the need for the CT console. This significantly shortens the parameter sending chain and saves time for the CT console to send electronic correction configuration parameters. Furthermore, both data processing and parameter updating are completed within the detector, eliminating the need to upload electronic correction data to the CT console for processing. This shortens the data transmission path, saves data transmission and processing time, and thus achieves rapid electronic correction.

[0075] In some implementations, the photon counting imaging device detector also includes multiple front-end detector modules, each of which includes a pixel acquisition integrated circuit, a data processing unit, and a storage unit.

[0076] In some cases, to shorten the data transmission link, this specific embodiment adds a data processing unit and a storage unit inside the front-end detector module. With this configuration, the raw electrical signal acquired by the pixel acquisition integrated circuit no longer needs to pass sequentially through the image preprocessing and transmission unit, the computed tomography (CT) rotating end control unit, and the CT fixed end control unit before finally being transmitted to the CT console for data processing to obtain updated electronic correction configuration information. Instead, the updated electronic correction configuration information can be obtained directly through the data processing unit. Simultaneously, it is no longer necessary for the CT console to send the updated electronic correction configuration information in reverse, sequentially passing through the CT fixed end control unit, the CT rotating end control unit, and the image preprocessing and transmission unit before being transmitted back to the front-end detector module for the configuration of the pixel acquisition integrated circuit. Instead, the updated electronic correction configuration information is directly stored in the storage unit, and when configuring the pixel acquisition integrated circuit, the updated electronic correction configuration information is directly retrieved from the storage unit.

[0077] Specifically, please refer to Figure 4 To shorten the data transmission link, this specific embodiment adds a data processing unit and a storage unit inside the front-end detector module. With this configuration, when the computed tomography (CT) scanner needs to perform electronic correction, the CT control console only needs to issue a single command to perform electronic correction. This command sequentially passes through the CT fixed-end control unit, the CT rotating-end control unit, and the image preprocessing and transmission unit before being transmitted to the front-end detector module. Upon receiving the command, the front-end detector module's data processing unit quickly reads the initial electronic correction configuration information from the storage unit and sends it to the pixel acquisition integrated circuit (PIC). The IPC receives the initial electronic correction configuration information and configures it. Next, the signal generation circuit inside the IPC generates a standard test excitation signal with specific amplitude, frequency, and waveform characteristics according to a preset test mode. Then, the IPC calls the received initial electronic correction configuration information to correct the standard test excitation signal and performs pulse counting or period counting operations on the corrected signal to obtain the raw data without further analysis or conversion. Finally, the IPC transmits the obtained raw data to the data processing unit. After obtaining the raw data, the data processing unit combines it with the currently used preset correction model and continuously optimizes the electronic correction configuration information through a data fitting algorithm. In each round of data fitting, the data processing unit adjusts the coefficients or parameter values ​​in the model based on the residual between the output under the current correction parameters and the expected target until the convergence condition is met, thereby obtaining updated electronic correction configuration information that makes the output response of each pixel unit tend to be consistent, and storing the updated electronic correction configuration information in the storage unit.

[0078] It should be noted that in this specific embodiment, the time required to complete an electronic calibration of all front-end detector modules has been reduced from tens of hours to less than one hour, thereby greatly improving the effective working time of the computed tomography (CT) scanner.

[0079] In the above embodiments, the data processing unit directly reads and sends the initial electronic correction configuration information from the detector's internal storage unit, without the need for the CT console. This significantly shortens the parameter sending chain and saves time for the CT console to send electronic correction configuration parameters. Furthermore, both data processing and parameter updating are completed within the detector, eliminating the need to upload electronic correction data to the CT console for processing. This shortens the data transmission path, saves data transmission and processing time, and thus achieves rapid electronic correction.

[0080] In some embodiments, the photon counting imaging device detector further includes an image preprocessing and transmission unit and multiple front-end detector modules, each front-end detector module including a pixel acquisition integrated circuit, a data processing unit disposed in the image preprocessing and transmission unit or each front-end detector module, and a storage unit disposed in the image preprocessing and transmission unit or each front-end detector module.

[0081] Specifically, the photon counting imaging device detector also includes an image preprocessing and transmission unit and multiple front-end detector modules, each of which contains a pixel acquisition integrated circuit. To shorten the data transmission link, the data processing unit can be located in the image preprocessing and transmission unit or in each front-end detector module. Similarly, the storage unit can also be located in the image preprocessing and transmission unit or in each front-end detector module. Therefore, the deployment locations of the data processing unit and storage unit can be flexibly combined to form a variety of optional configuration architectures.

[0082] In other words, the data processing unit and storage unit can be integrated into the image preprocessing and transmission unit, allowing the front-end detector module to maintain a relatively simple structure. The signal output from the pixel acquisition integrated circuit is directly transmitted to the data processing unit inside the image preprocessing and transmission unit for data processing to obtain the updated electronic correction configuration information. Simultaneously, the updated electronic correction configuration information is transmitted to the storage unit inside the image preprocessing and transmission unit for storage, and is retrieved from the storage unit when configuring the pixel acquisition integrated circuit.

[0083] Alternatively, the data processing unit and storage unit can be located in each front-end detector module. The signal output by the pixel acquisition integrated circuit can be directly processed by the data processing unit to obtain the updated electronic correction configuration information. Simultaneously, the updated electronic correction configuration information is directly stored in the storage unit and retrieved directly from the storage unit when configuring the pixel acquisition integrated circuit.

[0084] Alternatively, a hybrid configuration can be used, where the data processing unit is located in the image preprocessing and transmission unit, and the storage unit is located in each front-end detector module. Or, the data processing unit can be located in each front-end detector module, and the storage unit in the image preprocessing and transmission unit. The signal output from the pixel acquisition integrated circuit does not need to sequentially pass through the image preprocessing and transmission unit, the computed tomography (CT) rotating end control unit, and the CT fixed end control unit before finally being transmitted to the CT console for data processing to obtain updated electronic correction configuration information. Instead, the raw electrical signal can be transmitted to the data processing unit for data processing to obtain the updated electronic correction configuration information. Simultaneously, the updated electronic correction configuration information is directly stored in the storage unit and retrieved directly from the storage unit when configuring the pixel acquisition integrated circuit.

[0085] In the above embodiments, the photon counting imaging device detector further includes an image preprocessing and transmission unit and multiple front-end detector modules. Each front-end detector module includes a pixel acquisition integrated circuit. A data processing unit is disposed in the image preprocessing and transmission unit or each front-end detector module, and a storage unit is disposed in the image preprocessing and transmission unit or each front-end detector module. This shortens the data transmission path, saves data transmission time and processing time, thereby achieving the effect of rapid electronic correction.

[0086] This specification provides a detector for a photon counting imaging device. The detector further includes an image preprocessing and transmission unit and multiple front-end detector modules. The image preprocessing and transmission unit includes a data processing unit and a storage unit. Each front-end detector module includes a pixel acquisition integrated circuit. The data processing unit receives the instruction to perform electronic correction, reads the initial electronic correction configuration information from the storage unit, and sends it to the pixel acquisition integrated circuit. The pixel acquisition integrated circuit is used to receive initial electronic correction configuration information to execute the electronic correction process, obtain raw data, and transmit it to the data processing unit. The data processing unit is used to receive raw data and process it to obtain updated electronic calibration configuration information, which is stored in the storage unit.

[0087] Specifically, please refer to Figure 5 To shorten the data transmission link, this specific embodiment adds a data processing unit and a storage unit inside the image preprocessing and transmission unit. With this configuration, when the computed tomography (CT) scanner needs to perform electronic correction, the CT control console only needs to issue one instruction to perform electronic correction. This instruction passes sequentially through the CT fixed-end control unit and the CT rotating-end control unit before being transmitted to the image preprocessing and transmission unit. Upon receiving the instruction, the data processing unit quickly reads the initial electronic correction configuration information from the storage unit and sends it to the pixel acquisition integrated circuit in the front-end detector module. The pixel acquisition integrated circuit receives the initial electronic correction configuration information and configures it. Next, the signal generation circuit inside the pixel acquisition integrated circuit generates a standard test excitation signal with specific amplitude, frequency, and waveform characteristics according to a preset test mode. Then, the pixel acquisition integrated circuit calls the received initial electronic correction configuration information to correct the standard test excitation signal and performs pulse counting or period counting operations on the corrected signal to obtain the raw data without further analysis or conversion. Finally, the pixel acquisition integrated circuit transmits the obtained raw data to the data processing unit in the image preprocessing and transmission unit. After obtaining the raw data, the data processing unit combines it with the currently used preset correction model and continuously optimizes the electronic correction configuration information through a data fitting algorithm. In each round of data fitting, the data processing unit adjusts the coefficients or parameter values ​​in the model based on the residual between the output under the current correction parameters and the expected target until the convergence condition is met, thereby obtaining updated electronic correction configuration information that makes the output response of each pixel unit tend to be consistent, and storing the updated electronic correction configuration information in the storage unit.

[0088] In the above embodiments, by utilizing the data processing unit and storage unit integrated within the image preprocessing and transmission unit, the round-trip transmission of correction parameters in long links is avoided, significantly reducing data transmission latency, shortening data transmission paths, and saving data transmission and processing time, thereby achieving the effect of rapid electronic correction.

[0089] In some embodiments, the photon counting imaging device detector also includes a computed tomography (CT) console, a CT fixed-end control unit, and a CT rotating end control unit. The CT console is used to issue instructions to perform electronic correction. The instructions to perform electronic correction are issued from the CT console and sequentially pass through the CT fixed-end control unit, the CT rotating end control unit, and the image preprocessing and transmission unit before being transmitted to the data processing unit.

[0090] Specifically, the computed tomography (CT) control console, the CT fixed-end control unit, the CT rotating-end control unit, and the image preprocessing and transmission unit are sequentially and communicatively connected to the data processing unit. The command to perform electronic correction originates from the CT control console, passes sequentially through the CT fixed-end control unit, the CT rotating-end control unit, and the CT image preprocessing and transmission unit, and is then transmitted to the data processing unit. Upon receiving the command to perform electronic correction, the data processing unit reads the pre-stored initial electronic correction configuration information from its connected storage unit and then sends the read initial electronic correction configuration information to the pixel acquisition integrated circuit.

[0091] This specification provides a calibration device 600 for a detector in a photon counting imaging device. Please refer to [link to documentation]. Figure 6 The photon counting imaging device detector includes a pixel acquisition integrated circuit, a data processing unit, and a storage unit; the photon counting imaging device detector calibration device 600 includes an electronic calibration command issuing module 610, an electronic calibration execution module 620, and a raw data processing module 630.

[0092] The electronic calibration instruction issuing module 610 is used to read the initial electronic calibration configuration information from the storage unit and issue it to the pixel acquisition integrated circuit after the data processing unit receives the instruction to perform electronic calibration; The electronic calibration execution module 620 is used by the pixel acquisition integrated circuit to receive the initial electronic calibration configuration information to execute the electronic calibration process, obtain raw data and transmit it to the data processing unit; The raw data processing module 630 is used by the data processing unit to receive the raw data and perform data processing to obtain updated electronic calibration configuration information, wherein the updated electronic calibration configuration information is stored in the storage unit.

[0093] For a detailed description of the calibration device for the detector of the photon counting imaging equipment, please refer to the description of the calibration method for the detector of the photon counting imaging equipment above, which will not be repeated here.

[0094] This specification provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method in any of the above embodiments.

[0095] One embodiment of this specification provides a computer program product including instructions that, when executed by a processor of a computer device, enable the computer device to perform the steps of the method described in any of the above embodiments.

[0096] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and editable read-only memory (EPROM or flash memory), an optical fiber device, and a portable optical disc read-only memory (CDROM). In addition, computer-readable media can even be paper or other suitable media on which programs can be printed, because programs can be obtained electronically, for example, by optically scanning paper or other media, followed by editing, interpreting or otherwise processing as necessary, and then stored in a computer storage unit.

Claims

1. A calibration method for a detector in a photon counting imaging device, characterized in that, The photon counting imaging device detector includes a pixel acquisition integrated circuit, a data processing unit, and a storage unit; the method includes: After receiving the instruction to perform electronic correction, the data processing unit reads the initial electronic correction configuration information from the storage unit and sends it to the pixel acquisition integrated circuit. The pixel acquisition integrated circuit receives the initial electronic correction configuration information to execute the electronic correction process, obtains raw data, and transmits it to the data processing unit. The data processing unit receives the raw data and processes it to obtain updated electronic calibration configuration information, wherein the updated electronic calibration configuration information is stored in the storage unit.

2. The method according to claim 1, characterized in that, The pixel acquisition integrated circuit receives the initial electronic correction configuration information to execute the electronic correction process, obtains raw data, and transmits it to the data processing unit, including: After receiving the initial electronic correction configuration information, the pixel acquisition integrated circuit enters the test configuration state and generates a standard test excitation signal. The pixel acquisition integrated circuit uses the initial electronic correction configuration information to correct and count the standard test excitation signal, obtain the raw data, and transmit it to the data processing unit.

3. The method according to claim 1, characterized in that, The data processing unit receives the raw data and performs data processing to obtain updated electronic calibration configuration information, including: The data processing unit performs data fitting based on the original data and the preset correction model to obtain the updated electronic correction configuration information.

4. The method according to claim 1, characterized in that, The photon counting imaging device detector further includes an image preprocessing and transmission unit and multiple front-end detector modules. Each front-end detector module includes the pixel acquisition integrated circuit. The data processing unit is disposed in the image preprocessing and transmission unit or each of the front-end detector modules. The storage unit is disposed in the image preprocessing and transmission unit or each of the front-end detector modules.

5. The method according to any one of claims 1-4, characterized in that, The method includes: Update the electronic calibration configuration information in the pixel acquisition integrated circuit; The scan electrical signal is electronically calibrated using the updated electronic calibration configuration information to obtain scan data; Based on the scan data, image reconstruction is performed to obtain medical images.

6. A detector for a photon counting imaging device, characterized in that, The detector of the photon counting imaging device includes a pixel acquisition integrated circuit, a data processing unit, and a storage unit; The data processing unit is used to receive the instruction to perform electronic correction, read the initial electronic correction configuration information from the storage unit, and send it to the pixel acquisition integrated circuit. The pixel acquisition integrated circuit is used to receive the initial electronic correction configuration information to execute the electronic correction process, obtain raw data, and transmit it to the data processing unit; The data processing unit is used to receive the raw data and perform data processing to obtain updated electronic calibration configuration information, wherein the updated electronic calibration configuration information is stored in the storage unit.

7. The detector of the photon counting imaging device according to claim 6, characterized in that, The photon counting imaging device detector also includes multiple front-end detector modules, each of which includes the pixel acquisition integrated circuit, the data processing unit, and the storage unit.

8. The detector of the photon counting imaging device according to claim 6, characterized in that, The photon counting imaging device detector further includes an image preprocessing and transmission unit and multiple front-end detector modules. Each front-end detector module includes the pixel acquisition integrated circuit. The data processing unit is disposed in the image preprocessing and transmission unit or each of the front-end detector modules. The storage unit is disposed in the image preprocessing and transmission unit or each of the front-end detector modules.

9. The detector of the photon counting imaging device according to claim 8, characterized in that, The photon counting imaging device detector also includes a computed tomography (CT) console, a CT fixed-end control unit, and a CT rotating end control unit. The CT console is used to issue instructions to perform electronic correction. The instructions to perform electronic correction are issued from the CT console and sequentially pass through the CT fixed-end control unit, the CT rotating end control unit, and the image preprocessing and transmission unit before being transmitted to the data processing unit.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 6.

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