14 results about "Helical computed tomography" patented technology

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.

This disclosure relates to an X-ray computed tomography (CT) apparatus, an information processing system, an information processing method, and a non-transient computer-readable medium. The X-ray computed tomography (CT) apparatus includes: an X-ray tube configured to irradiate X-rays; a detector configured to detect X-rays irradiated by the X-ray tube and penetrating a subject; a reconstruction processing unit configured to reconstruct imaging data output from the detector and generate CT image data and material breakdown image data; a first inference unit configured to perform inference on the material breakdown image data; a second inference unit configured to perform inference on the CT image data; a third inference unit configured to perform inference on the composite image data; a selection unit configured to select the inference result of the third inference unit if the inference result of the first inference unit differs from the inference result of the second inference unit; and a display control unit configured to display the selected inference result.

For dosimetry, a miniaturized nuclear imaging system with a solid-state detector is used to determine the activity and / or injected dose of radiopharmaceuticals. By being sized to scan a syringe or vial, the solid-state detector can be used to determine the injected dose with higher accuracy than current dose calibrators and with less frequent use of calibration or normalization sources. The miniaturized nuclear imaging system reconstructs activity in the same way as a nuclear imaging system that scans patients, and therefore can be used to calibrate a dose model. A tissue mimicking phantom with a solid-state dosimeter measures the dose from a radiopharmaceutical that is used to calibrate the dose model.

For single photon emission computed tomography (SPECT) detectors, embedded capacitive material (ECM) is used in printed circuit boards (PCB) with semiconductor detectors. High voltage (HV) filtering and / or blocking capacitors are formed from ECM. ECM is less disruptive to radiation or emissions to be detected by the semiconductor detectors compared to surface mounted capacitors.

A method for determining a convolution kernel for an iterative statistical algorithm based on a continuous-to-continuous data model for image reconstruction from radiation measurements obtained in emission tomography, specifically in a Positron Emission Tomography (PET) scanner. The method improves the resolution of reconstructed images, reduces the radiation dose absorbed by patients during PET examinations, and / or shortens the measurement acquisition time without significant loss in the quality of the diagnostic images obtained. Specifically, the quality of the functional images remains at the same level. These improvements are achieved through the design of the convolution kernel, which takes into account the statistical properties of the measurement signals registered during the acquisition process in the PET scanner.

A computed tomography imaging system (102) includes a gantry (104) mounted to a ground. The gantry includes a rotating frame (110) rotatably supported in the gantry, at least one component (304) mounted to the rotating frame, and a gantry motion sensing system (128) configured to sense a motion of the gantry indicative of a status of at least one of an attachment of the gantry to the ground and an attachment of the at least one component to the rotating frame while the rotating frame is rotating, and generate a motion signal indicative of the status. Motion signal processing circuitry (604) is configured to process the motion signal, and in response to determining that the motion signal exceeds at least one predetermined threshold, send a notification indicating that at least one of the attachment of the gantry to the ground and the attachment of the at least one component to the rotating frame is compromised.

The present disclosure relates to cone-beam and 3D fluoroscope lung navigation. A method and system for reducing the deviation between computed tomography images and a patient using three-dimensional reconstruction. The method utilizes cone-beam imaging or three-dimensional fluoroscopy to supplement or replace preoperative computed tomography imaging.

To improve contrast-enhanced CT examinations, an image quality assurance device (10) is provided. The image quality assurance device (10) comprises an input unit (12), a processing unit (14), and an output unit (16). The input unit is configured to receive image data acquired by a spectral computed tomography (CT) scanner. The processing unit is configured to perform an analysis of contrast enhancement in a region of interest in the acquired image data and to compare the contrast enhancement of the region of interest to a desired contrast enhancement defined by an examination protocol to determine whether the contrast enhancement of the region of interest is sufficient. In response to determining that the contrast enhancement of the region of interest is not sufficient, the processing unit is configured to generate a trigger signal configured to trigger the spectral CT scanner to derive spectral data. The output unit is configured to output the generated trigger signal.

A system and method includes determining a region of interest of an imaged object, generating a first linear attenuation coefficient map of the imaged object, the first linear attenuation coefficient map being generated to associate voxels of the region of interest of the imaged object with a greater linear attenuation coefficient than voxels of other regions of the imaged object, attenuation correcting a plurality of tomographic frames of the imaged object based on the first linear attenuation coefficient map to generate a second plurality of tomographic frames, and determining a tomographic inconsistency of the second plurality of tomographic frames. Some aspects further include generating a second linear attenuation coefficient map of the imaged object, attenuation correcting the plurality of tomographic frames based on the second linear attenuation coefficient map to generate a third plurality of tomographic frames, and reconstructing a three-dimensional image based on the third plurality of tomographic frames and the determined tomographic inconsistency.

Disclosed is an oral cavity scanner having a tomography function and an oral cavity tomography method using the same. The oral cavity scanner having a tomography function includes a shape measurement light projector that irradiates shape measurement light for obtaining a shape image of an oral cavity structure; a shape measurement camera that detects reflected light formed by reflection of the shape measurement light on a surface of the oral cavity structure to obtain a surface shape image of the oral cavity structure; an OCT main body that transmits tomographic light to the oral cavity structure and detects reflected light reflected inside the oral cavity structure to obtain an internal cross-sectional image of the oral cavity structure; an OCT scanning probe that irradiates tomographic light emitted from the OCT main body to a desired position of the oral cavity structure and transmits reflected light reflected from the oral cavity structure to the OCT main body; and a beam splitter that overlaps optical paths of the shape measurement light irradiated by the shape measurement light projector and the tomographic light irradiated by the OCT scanning probe.

A system (IQE) for image processing and related method comprises an input interface (IN) for receiving a first image volume (V1) which is reconstructable from projection data (λ) which is acquirable by an X-ray detector of a tomographic imaging apparatus for a first region (EFOV) of an imaging domain (ER). During acquisition, an occluding object (OO) is located inside said first region, but the occluding object (OO) or parts thereof is located outside a second region (SFOV) of the imaging domain (ER) which is different from the first region (EFOV), and wherein said second region (SFOV) can comprise a region of interest to be imaged. An artifact corrector (AC) corrects image artifacts based on said first volume (V1) which can be caused by said occluding object (OO) in a second image volume (V2) which is reconstructable from said projection data (λ) of said second region (SFOV) in said domain (ER).

This invention relates to an apparatus for determining a control protocol for controlling a C-arm system including a radiation source. The control protocol includes a sequence of roll angles and a sequence of propeller angles. The apparatus includes: a tilt plane providing unit for providing a tilt plane tilted relative to a vertical plane; and a control protocol determining unit for determining the control protocol by determining the sequence of roll angles and the sequence of propeller angles, such that the radiation source follows a trajectory including a circular component in the tilt plane and allowing the C-arm system to acquire projection data for image reconstruction. The apparatus allows for the acquisition of computational images, such as tomographic images, with improved quality and reduces radiation in radiation-sensitive areas.

A weight simulator for weight-bearing computed tomography of a patient's lower limb, which allows the tomography to be performed with the individual in a supine position and with any tomograph, thus providing greater practicality, comfort and accessibility for any medical centre. The simulator of the invention allows the person to support the lower limb in a much more comfortable and stable manner, avoiding any involuntary movement, thus obtaining better results and, consequently, a better diagnosis.

Systems and methods for reducing motion artifacts in cone-beam computed tomography (CBCT) image reconstruction of a subject. The method includes accessing CBCT data and model-based CT (MBCT) data of the subject acquired with cone-beam CT and conventional CT imaging systems, respectively, accessing breathing amplitude signal data of the subject acquired with the CBCT data and the MBCT data, and generating a breathing motion model and motion model data based on the MBCT data and corresponding breathing amplitude signal data. The method also includes cross-calibrating the breathing amplitude signal data, wherein cross-calibrating the breathing amplitudes includes simulating CBCT projection images using the MBCT data and determining at least one breathing amplitude corresponding to the MBCT data that provides a corresponding simulated CBCT projection to an actual projection image, providing a correspondence between the breathing amplitudes corresponding to the MBCT data and the CBCT data. The method further includes reconstructing the CBCT data using the breathing motion model based on the MBCT data and the breathing amplitude corresponding to the MBCT data.