119 results about "Helical computed tomography" patented technology

A computed tomography imaging system (102) includes a gantry (104). The computed tomography imaging system also includes a rotating frame 106 rotatably supported in the gantry. The rotating frame comprises an X-ray source (114) and an X-ray radiation sensitive detector (120), the X-ray source being configured to emit X-ray radiation traversing an examination region, the X-ray radiation sensitive detector is disposed opposite the X-ray source across the examination region and is configured to detect X-ray radiation traversing the examination region and to generate a signal indicative of the detected X-ray radiation. The computed tomography imaging system also includes at least one component (202, 214) of the gantry or rotating frame that generates audible noise. The computed tomography imaging system also includes an audible noise reducer (128) configured to reduce the audible noise. The audible noise reducer includes a resonator that is tuned to a first frequency of the audible noise.

For controlling reconstruction in emission tomography, the quality of data for detected emissions and / or the application controls the settings used in reconstruction. For example, a count density of the detected emissions is used to control the number of iterations in reconstruction to more likely avoid over and under fitting. The count density may be adaptively determined by re-binning through pixel size adjustment to find a smallest pixel size providing a sufficient count density. As another example, the detected data may have poor quality due to motion or high body mass index (BMI) of the patient, so the reconstruction is set to perform differently (e.g., less smoothing for high motion or a different number of iterations for high BMI). The quality of the data may be used in conjunction with the application or task for imaging the patient to control the reconstruction.

In emission imaging, one, two, or a few topograms without a full CT scan are used to localize, such as through triangulation, and / or generate an attenuation map, such as based on model fitting. A limited radiation exposure, rather than a longer, larger full CT exposure, is needed to localize and / or provide attenuation correction for emission imaging, such as cardiac SPECT imaging.

Medical computed tomography (CT) data is processed as follows. Projection data obtained by scanning a subject is retrieved. The retrieved projection data is processed to reconstruct a three-dimensional image. A two-dimensional image is generated based on the reconstructed three-dimensional image. A disease or an uncertainty in an identification of the disease is identified in the two-dimensional image. The projection data or the three-dimensional image is reprocessed into an updated three-dimensional image such that at least one para-meter of the reprocessing is based on the disease or the uncertainty in the identification of the disease. An updated two-dimensional image is then generated based on the updated three-dimensional image.

A method and system for correcting detector defects in an X-ray microscope system based on deep learning. Normal geometry projections and offset geometry projections are collected for a given detector, mappings between defective regions and healthy regions are created, and a machine learning system is trained using these projections. The trained neural network system is then used to correct the tomographic projection dataset, thereby improving the image quality of the resulting reconstructed tomographic image volume set.

A cone beam breast computed tomography scanning system includes a vertical plane gantry subsystem pivotally connected to a foundation element for ergonomic patient positioning.

The invention relates to a detection system (100) for a computed tomography system (200). The detection system (100) comprises a first detector (110) and a second detector (120), each detector being configured for detecting X-ray radiation of the computed tomography system (200) impinging on a respective detector. The detection system further comprises a repositioning mechanism (130) configured for repositioning at least one of the first detector (110) and the second detector (120) relative to the other of the first detector (110) and the second detector (120).

Images are reconstructed from data acquired using an ultra-fast-pitch acquisition with a CT system. As an example, an ultra-fast-pitch acquisition mode in single-source helical CT (≥1.5) can be used to acquire data. A trained machine learning algorithm, such as a neural network, is used to reconstruct images in which artifacts associated with insufficient data acquired in the ultra-fast-pitch mode are reduced. An example neural network can include customized functional modules using both local and non-local operators, as well as the z-coordinate of each image, to effectively suppress the location- and structure-dependent artifacts induced by the ultra-fast-pitch mode. The machine learning algorithm can be trained using a customized loss function that involves image-gradient-correlation loss and feature reconstruction loss.

A method for providing thermal conductivity data relating to an anatomical structure, comprises: receiving first spectral computed tomography data relating to the anatomical structure; calculating a fat map of the anatomical structure and a water map of the anatomical structure based on the first spectral computed tomography data; calculating the thermal conductivity data relating to the anatomical structure based on the fat map and the water map; and providing the thermal conductivity data.

A computed tomography device comprises a gantry with an opening, and a radiation protection apparatus covering the opening. The radiation protection apparatus has a holding structure, a radiation protection curtain and a pivoting apparatus. An examination object can be inserted into the opening along a system axis of the gantry when the holding structure is in a first position relative to the gantry. The holding structure is pivotably mounted relative to the gantry about a pivot axis via the pivoting apparatus such that the holding structure can be lowered relative to the gantry from the first position to a second position by a first pivoting motion of the holding structure about the pivot axis. The radiation protection curtain is arranged on the holding structure. A lower region of the radiation protection curtain hangs down from the holding structure.

A system and method for producing a computed tomography (CT) medical image includes receiving x-rays passing through an object with a photon-counting detector system, which includes a plurality of detector pixels configured to generate a photon-counting signal in response to receiving each photon of the x-rays having passed through the object. The method also includes summing a charge associated with each photon received at a given detector pixel of the plurality of pixels to generate a charge integration signal, utilizing the charge integration signal to correct a count of the photon-counting signal for pileup-induced count losses to create a corrected photon-counting signal, and reconstructing an image of the object using the corrected photon-counting signal.

A system (FS) and related method for facilitating contrast agent-based tomography imaging may comprise: an input interface (IN) for receiving a specification of imaging operations of an imaging device (IA) of tomography type and a 3D survey image volume (V0) of a patient obtained by the imaging device (IA) in a preparation phase prior to a contrast agent-assisted imaging phase; a segmenter (SEG) for segmenting a monitored area m-ROI in the 3D survey image volume, the m-ROI being associated with a target anatomical feature that can be specified in the specification; and an output interface (OUT) providing a reference position (z0) of the segmented m-ROI in the 3D survey volume to facilitate monitoring of the presence of contrast agent related to the target anatomical feature.

A cone beam breast computed tomography system includes a breast stabilization unit for maintaining the position and stability of a breast during imaging.

A mechanism for generating an artifact estimation image that represents the effect of cone-beam artifacts in a computed tomography (CT) image. This is achieved by identifying locations of gradients (i.e., abrupt changes in intensity) in an axis of the CT image that is parallel to a rotation axis of a CT system that generated the CT image, where each gradient represents a source of a cone-beam artifact. A look-up table is used to individually identify the effect of the cone-beam artifact on a region around each identified location of the gradient, thereby generating the artifact estimation image.

Provided are: a molded article having excellent strength and appearance; a method for producing the molded article; and a resin composition and a molding material for 3D printers, which are capable of providing the molded article. In one embodiment, provided is a molded article containing a thermoplastic resin and cellulose microfibers, the molded article being an output of a 3D printer and having a region having a thickness of 2.5 mm or more, at least one 2 mm * 2 mm * 2 mm cubic region selected from the location having a thickness of 2.5 mm or more so as not to include the outermost layer of the molded object has a porosity of 10 vol% or less as determined by an X-ray computed tomography (CT) method.

The present invention relates to a solution for determining the content of a fluid flow, especially for determining the gas fraction or density of the fluid flow at a predetermined rate. It includes a data storage device storing an assumed water liquid ratio value related to the flow, a gamma densitometer configured to measure the density in at least a defined section of the fluid flow in a predetermined time period, thus providing a density measurement of the fluid flow in said defined section, and storing a corresponding first density value and tomographic impedance measuring unit configured for providing a sequence of discrete tomographic measurements of the gas / liquid distribution of the flow at discrete time steps within said time period. The tomographic measuring unit also calculating the gas fraction and density for the fluid flow in the defined section for each discrete time step.

Example methods and systems for tomographic image reconstruction are provided. One example method can include obtaining two-dimensional (2D) projection data (310) and processing the 2D projection data using an AI engine (301) that includes a plurality of first processing layers (311), an interposed back-projection module (312), and a plurality of second processing layers (313). Example processing using the AI engine can include generating 2D feature data (320) by processing the 2D projection data using the plurality of first processing layers, reconstructing first three-dimensional (3D) feature volume data (330) from the 2D feature data using the back-projection module, and generating second 3D feature volume data (340) by processing the first 3D feature volume data using the plurality of second processing layers. Methods and systems for tomographic data analysis are also provided.

Methods and apparatus for generating a hybrid (e.g., fused) cone beam computed tomography (CBCT) scan using intraoral scan data. Methods and apparatus for more efficiently processing CBCT data are also described herein. Also described herein are methods and apparatus for enhancing dental and / or orthodontic treatment planning using hybrid CBCT and intraoral scan data, methods and apparatus for interactively presenting hybrid CBCT and intraoral scans and generating one or more treatment plans in conjunction with a user and / or a dental instrument for treating a patient according to a treatment plan that takes into account hybrid CBCT and intraoral scans.

The invention relates to an antenna arrangement (100) for SAR single pass tomography, comprising: a first receive antenna system (110) comprising a first support structure (114), a first cantilever (118) mounted at the first support structure (114), an inner receive antenna (112) attached at a first location of the first cantilever (118) and an outer receive antenna (111) attached at a second location different from the first location of the first cantilever (118), the inner receive antenna (112) and the outer receive antenna (111) of the first receive antenna system (110) being configured to receive an SAR signal at the same time, a second receive antenna system (120) comprising a second support structure (124), a second cantilever (128) mounted at the second support structure (124), an inner receive antenna (121) attached at a first location of the second cantilever (128) and an outer receive antenna (122) attached at a second location different from the first location of the second cantilever (128), the inner receive antenna (121) and the outer receive antenna (122) of the second receive antenna system (120) being configured to receive the SAR signal at the same time, a transmit antenna system (130) comprising a transmit antenna (131) configured to transmit the SAR signal; wherein the first receive antenna system (110) and the second receive antenna system (120) are arranged distant from each other, and wherein the first receive antenna system (110) and the second receive antenna system (120) each comprise a single positioning system having a positioning system sensor (116, 126).

The present invention addresses the problem of providing a compact X-ray CT device capable of performing vertical imaging and recumbent imaging. [Solution] An X-ray CT device according to the present embodiment is provided with a gantry main body, a first support part, and a second support part. The gantry has an imaging system relating to imaging of a subject and an opening into which the subject is inserted. The first support portion has a first rotation mechanism that rotates the stand body about the pitch axis and a plurality of first movement mechanisms that move the stand body in the vertical direction, and at least two of the plurality of first movement mechanisms are disposed so as to sandwich the pitch axis in the horizontal direction. The second supporting part is provided with a second rotating mechanism enabling the stand main body to rotate around the pitch axis and one or more second moving mechanisms enabling the stand main body to move in the vertical direction, the number of the second moving mechanisms is smaller than that of the first moving mechanisms, and the second moving mechanisms are arranged between the pitch axis and the end of the stand main body in the horizontal direction.

Volume-of-interest (“VOI”) imaging with computed tomography (“CT”) (e.g., VOI CT in a helical or axial acquisition geometry) is used to produce higher resolution, lower noise images with less radiation dose than is required for equivalent resolution and noise characteristics using standard data acquisitions. Truncation artifacts introduced by the VOI imaging are removed or otherwise reduced using a deep learning model that is trained to remove truncation artifacts from VOI images.

A computed tomography (CT) system includes a scanning unit having: an x-ray emitter; a detector arranged to receive x-rays emitted from the x-ray emitter during a scanning operation; and a manipulation unit arranged to rotate an object about an axis of rotation and to move the object through a plurality of positions along a path defined by the axis of rotation between the x-ray emitter and the detector. The CT system may also include a computing device including a memory storing computer executable instructions and at least one data processor. The processor is arranged to execute the instructions, the instructions causing the processor to perform operations, the operations comprising: receiving first data characterizing the path from the scanning unit; and receiving, from the scanning unit, second data characterizing one or more x-ray images of the object at at least one of the plurality of positions; determining a compensation to be applied to the second data based on the first data; reconstructing an image of the object based on the first data, the second data, and the compensation; and providing the reconstructed image.

Improved novel 3D imaging and reconstruction methods for quantitative and accurate 3D imaging used in multiple industries, segments, and applications within each. Improvement includes methods and hardware configured to improve performance and lower radiation and improve accessibility. Using simplified system matrix and datasets of little scatter interference in tomographic image acquisition and reconstruction, in some cases, using time continuity and spatial continuity to generate parameter data for substances within VOI for a number of key applications in medical and non-medical fields.

An X-ray computed tomography (CT) apparatus includes an X-ray tube configured to radiate X-rays; a detector configured to detect X-rays radiated by the X-ray tube and passed through a subject; a reconstruction processing unit configured to reconstruct imaging data output by the detector and generate CT image data and material decomposition image data; a first inference unit configured to perform inference on the material decomposition image data; a second inference unit configured to perform inference on the CT image data; and a display control unit configured to cause a display unit to display at least one of an inference result of the first inference unit and an inference result of the second inference unit.

Systems and methods for performing one or more medical imaging analysis tasks on PCCT (photon-counting computed tomography) images are provided. Image acquisition parameters of a PCCT image acquisition device are determined for acquiring PCCT images. One or more PCCT images of an anatomical object of a patient acquired using the PCCT image acquisition device configured with the image acquisition parameters are received. One or more medical imaging analysis tasks analyzing the anatomical object are performed based on the one or more PCCT images using one or more machine learning based models. Results of the one or more medical imaging analysis tasks are output.

A computed tomography imaging system includes: a gantry; and a rotating frame rotatably supported in the gantry and including an X-ray source and an X-ray radiation sensitive detector. The computed tomography imaging system further includes: an inflation chamber configured to hold pressurized air; and a cooling system. The cooling system includes: a heat exchanger configured to transfer heat from a coolant cooling at least one component carried by the rotating frame; and a fan system configured to move cold air from the plenum to the heat exchanger and to move heated air away from the heat exchanger. The cooling system further includes at least one of: an intake assembly configured to provide an intake path for the cool air to reach the heat exchanger; and an exhaust assembly configured to provide an exhaust path for the heated air.

A method for determining a deformation field of at least one layer of paint applied to a support during crosslinking of the layer or the layers of paint is disclosed. The method includes a step (E1) of provision of a sample, a step (E2) of 3D tomographic measurement of the sample and a set of successive steps(S) repeated iteratively comprising a step (E3) of dynamic mechanical analysis of the sample subjected to at least one temperature cycle (C), a step (E4) of 3D tomographic measurement of the sample, a step (E5) of determining a deformation field of each layer of paint of the sample.

A method and a system for limiting coincidence data includes detecting a plurality of coincidence events during a scan of a subject with a detector array of a positron emission tomography (PET) scanner, wherein the PET scanner includes a plurality of detector rings disposed along a longitudinal axis of the PET scanner, and each detector ring includes a plurality of detectors. The method also includes limiting data associated with the plurality of coincidence events from the scan so that the data varies in a radial extent relative to a center of a field of view of the scan.

An X-ray Computed Tomography (CT) apparatus according to an embodiment includes storage circuitry and processing circuitry. The storage circuitry is configured to store therein a table keeping first information about an energy spectrum of X-rays in correspondence with second information about a focal point position of an X-ray tube. The processing circuitry is configured to obtain third information about an energy spectrum of X-rays emitted from the X-ray tube. The processing circuitry is configured to specify a corrected focal point position on the basis of the third information and the table.

A computer-implemented method of reducing noise in computed tomography, CT, image slices (1101..i, x i ) through an anatomical region, is provided. The method comprises: receiving CT data (120) representing the image slices (1101..i, x i ); adjusting an amount of noise in the image slices (1101..i, x i ) to provide de-noised image slices (I) having a similar amount of noise; and outputting the de-noised image slices (I).