70 results about "Time gain compensation" patented technology

The invention provides an ultrasound signal de-noising method based on correlation analysis and empirical mode decomposition (EMD). The method comprises the following steps: firstly fitting the energy curve of the pure noise under ultrasound empty acquisition state to obtain a trend curve Alpha of the noise which changes along with time gain compensation (TGC); then dividing the normally acquired ultrasound echo signals with two continuous frames into two parts, one of which is called main noise signal, the dot product of the echo signals and the Alpha curve and the other of which is called main useful signal, the difference of the echo signals and the first part; carrying out EMD on the main noise part to obtain the energy ratio of the first intrinsic mode function (IMF) component as the weighting coefficient of the signals with two frames and carrying out threshold processing after carrying out correlation analysis on the corresponding IMF component; and finally obtaining the de-noised signal after carrying out weighting reconstruction on the main noise part and the main signal part. The invention has adaptive signal decomposition and noise reduction capabilities, greatly improves the signal to noise ratio of the ultrasound signal and obtains good de-noising effect.

The invention provides a B image balancing method and a system structure based on two-dimensional analysis relating to a data processing technology of ultrasonic B image in medical field. A data buffer region is additionally arranged in an ultrasonic imaging system to store demodulated and desampled data and write the data into 'digital time gain compensation', namely a DTGC parameter generating module, and then the DTGC parameters output by the module are written into a DTGC module; the DTGC module compensates the data of each beam or every adjacent plurality of beams of receiving scanning lines with different DTGC parameters PDM[i][j], wherein, the PDM[i][j] is a two-dimensional array and the value is different for different receiving scanning lines. Compared with the prior art, the method and the system structure have the beneficial effects that the two-dimensional DTGC parameters overcome the defect that the lateral balancing of the image cannot be solved by one-dimensional DTGC parameters only related to depth; in addition, the two-dimensional DTGC parameters full automatically analyze and need no customer involvement, thereby simplifying customer operation.

A method, process and apparatus for compensating for changes to the gain of photo detectors in a nuclear imaging apparatus is disclosed. Specifically, embodiments detect positron annihilation event pulses using photo detectors. Changes to the gain of the photo detectors are compensated for by determining the relationship of a detected event pulse peak with a target event pulse peak. Based on the difference between these two peaks, a corrected gain is determined in a closed-loop control system. The corrected gain can be used to compensate for temperature changes that can affect the gain of the photo detectors.

The present invention relates to an image processing system for enhancing the image quality of an ultrasound image. The image processing system may include: an image data forming unit for forming image data based on image signals acquired from a target object; a log-compression unit for log-compressing the image data to provide a log-compressed image; a TGC processor for analyzing a vertical profile of pixel intensities in the log-compressed image and automatically setting a TGC (time gain compensation) parameter based on the analysis result; a gain processor for calculating mean brightness of pixels included in the log-compressed image applying the set TGC parameter and comparing the calculated mean brightness with predetermined brightness, thereby automatically setting a gain parameter based on a comparison result; a DR processor for automatically setting a DR (dynamic range) parameter by using edge contrast and background roughness of the log-compressed image applying the set TGC and gain parameters; and an image forming unit for applying the TGC, gain and DR parameters to the image data.

Various embodiments include systems and methods for gain auto-correction. Automatic gain optimization or correction may be applied in an ultrasound system, during an automatic gain mode. The automatic gain optimization or correction may comprise automatic time gain compensation (TGC) and/or lateral gain compensation (LGC) optimization or correction. The applying of the gain optimization or correction may comprise determining an optimal gain, such as based on processing input ultrasound images; determining, based on the optimal gain, settings for a plurality of user controls of the ultrasound system (e.g., slides, knobs, etc.), corresponding to the optimal gain; and providing feedback to a user of the ultrasound system, relating to (e.g., showing) the settings for the plurality of user controls that correspond to the optimal gain. The plurality of user controls may be adjustable manually and automatically. The user controls may be physical or virtual.

A low noise variable gain amplifier and method for processing received signals in an ultrasound medical imaging system is disclosed. Unlike solutions known from the prior art, the signals are amplified by a binary-coded gain amplifier having its amplification factor progressively increased during the penetration of the transmitted pulse into a patient's body. This allows enhancing both the system dynamic range and Signal to Noise Ratio.

The invention discloses a touch time gain compensation control apparatus used in an ultrasonic diagnostic apparatus and a hand-slip type time gain compensation curve setting method. The touch time gain compensation control apparatus comprises a touch inductor used for inducing touch action and a processor which is used for processing an output signal from the touch inductor and sending the processed signal to a host computer. The method comprises the steps as follows: a finger slips over a touch area of a touch time gain compensation device; the touch inductor identifies the slipped position by the finger and outputs a single corresponding to the position; the processor processes the signal from the touch inductor and sends the processed signal to the host computer; and the host computer draws a time gain compensation curve according to the received signal. The touch time gain compensation device and the time gain compensation curve setting method provided by the embodiment of the invention have low cost, high reliability and convenient operation.

Methods for optimizing gain of an ultrasound image may include: acquiring a tissue image and a first noise image under a same imaging condition; de-noising the tissue image by the first noise image to obtain a de-noised tissue image; identifying a tissue region in the de-noised tissue image; determining whether a percentage of the tissue region in the de-noised tissue image exceeds a preset threshold condition; selecting, according to the determination result, a corresponding calculation method to calculate a first master gain and a first time gain compensation (TGC) curve for the tissue image; and applying the first TGC curve and the first master gain obtained through calculation to the tissue image acquired before.

The embodiment of the invention discloses a method and device for achieving the function of adjusting time gain compensation through a touch screen. The method for achieving the function of adjusting the time gain compensation through the touch screen comprises the steps that a time gain compensation control interface is opened according to a touch instruction of a user, the time gain compensation input by the user is obtained through the time gain compensation control interface on the touch screen, and setting of a device is changed according to the time gain compensation input by the user. According to the method and device for achieving the function of adjusting the time gain compensation through the touch screen, the TGC input by the user is obtained through the TGC control interface on the touch screen, and thus TGC setting of the device is changed. When the technical scheme is compared with a technical scheme for adjusting TGC in the prior art, due to the fact that the TGC set by the user is input through the TGC control interface on the touch screen, the user only needs to touch the touch screen, specialized keys are not needed, and the phenomenon that ageing happens after the keys are used for a long time is avoided; meanwhile, the cost for addition of key hardware is reduced, and the problem that the function of adjusting the TGC cannot be conveniently improved is solved.

The invention discloses a self-adapting time-gain-compensation controller of a B-mode ultrasonic scanner system. The self-adapting time-gain-compensation controller comprises a first rom memory and a second rom memory, as well as an either-or selector, wherein, a first time-gain-compensation controlling curve data is stored in the first rom memory and a second time-gain-compensation controlling curve data is stored in the second rom memory; the first rom memory and the second rom memory are respectively connected to the input end of the either-or selector; the either-or selector takes input probe frequencies as selective controlling signals to output the first time-gain-compensation controlling curve data or the second time-gain-compensation controlling curve data according to different probe frequencies. The self-adapting time-gain-compensation controller of the B-mode ultrasonic scanner system sets a plurality of time-gain-compensation controlling curves according to attenuation curves corresponding to the different probe frequencies, and selects the corresponding time-gain-compensation controlling curves according to the different probe frequencies, thereby greatly improving the effect of time gain compensation.

The present invention provides an ultrasound system, which comprises: a signal acquiring unit to transmit an ultrasound signal to an object and acquire an echo signal reflected from the object; a signal processing unit to control TGC (Time Gain Compensation) and LGC (Lateral Gain Compensation) of the echo signal; a TGC/LGC setup unit adapted to set TGC and LGC values based on TGC and LGC curves inputted by a user; and an image producing unit adapted to produce an ultrasound image of the object based on the echo signal. The signal processing unit is further adapted to control the TGC and the LGC of the echo signal based on the TGC and LGC values set by the TGC/LGC setup unit.

The invention discloses an ultrasonic micro-terrain detection system in a deep sea mining reverberation environment. The ultrasonic micro-terrain detection system comprises an arbitrary waveform generation module, a transceiving integrated ultrasonic probe, a signal transmitting and receiving conversion circuit, a signal preprocessing module, a data acquisition card and an industrial personal computer. The arbitrary waveform generation module comprises an arbitrary waveform output board card and a power amplifier. The output waveform parameters of the arbitrary waveform output board card are set by the industrial personal computer. The signal preprocessing module comprises a time gain compensation circuit, a gain control circuit, and an amplifying and filtering circuit. By means of the system, according to different reverberation environments, the real-time calculation of transmitted waves can be realized, and the self-adaptive waveform transmitting requirements under different reverberation environments are met. Meanwhile, the waveform replacement is simple and convenient. The signal transmitting and receiving conversion circuit can be used for isolating a transmitting circuit relatively high in exciting voltage from an echo signal receiving circuit low in voltage. The interference of reverberation can be effectively inhibited by the signal preprocessing module. As a result, the ultrasonic detection requirement of the underwater reverberation environment can be met.

The invention provides a novel intravascular ultrasonic capture card and an ultrasonic imaging system. The capture card comprises an analog front end, an analog-digital conversion device, an FPGA, a power supply and a random access memory. The functions of the FPGA adopted by the ultrasonic capture card include capture control logic, impulse control logic, servo mechanism control logic and access timing sequence and time gain compensation logic. The capture card can achieve ultrasonic excitation and ultrasonic echo signal acquisition, caching, processing and transmission. Furthermore, due to the adoption of FPGA chips integrated with an interface of a PCI-Express bus, the number of chips and the number of lines of a plated circuit are reduced, and the integration level and reliability of the capture card are improved. Due to the interaction between the PCI-Express bus and an upper computer, the performance of the ultrasonic imaging system can well meet current requirements.

An ultrasound diagnostic apparatus to improve picture quality of images by automatically adjusting image parameters, and a control method thereof are provided. The ultrasound diagnostic apparatus includes an image signal processor to perform envelope detection processing on ultrasound image data, and an image parameter processor to calculate a Time Gain Compensation (TGC) parameter from the envelope detection processed ultrasound image data, adjust the envelope detection processed ultrasound image data based on the TGC parameter, and calculate a Dynamic Range (DR) parameter from the envelope detection processed ultrasound image data adjusted based on the TGC parameter to apply the DR parameter to the envelope detection processed ultrasound image data.

The invention discloses an opto-acoustic tomography reconstruction method based on a frequency domain and a wave number field. The method comprises the following steps: acquiring radio frequency dataand system parameters, performing time gain compensation, performing three-dimensional Fourier transform, performing interpolation processing, performing three-dimensional Fourier transform, performing demodulation to obtain envelope, adjusting a contrast ratio, outputting opto-acoustic images, and optimizing the opto-acoustic images. By adopting the method, three-dimensional reconstruction on opto-acoustic signals is implemented in a frequency domain and a wave number field, the influence that signals are not completely acquired in a limited angle can be reduced, and meanwhile, the influenceof nonuniformity of sound velocities is taken into account. The reconstruction method disclosed by the invention has the advantages of being high in reconstruction image resolution, high in signal tonoise ratio, small in fake shadow and rapid in reconstruction calculation speed.