Toshiba Medical Systems Corporation

Kabushiki Kaisha Toshiba

Canon Medical Systems Corporation

Gin Chung Wang

Jerry Wang

Huini Du

Miesher Rodrigues

Daniel Gagnon

Hao Yang

Liang Cai

Alan Karr

Daniel McGowan

Yu Zou

Kent C Burr

Michael D Silver

A photon-counting system includes photon-counting detectors that output photon-counting signals to indicate a number of photons impinging on the photon-counting detectors. The system also includes analog-to-digital conversion circuits, which convert one of the photon-counting signals into a digital photon-counting signals, and a processor that processes the digital photon-counting signals to extract information from the photon-counting signals. The information extracted can include a photon-counting rate. An intelligent multiplexer that, based on the photon-counting rate, modifies interconnection of the photon-counting detectors and analog-to-digital conversion circuits and provides digital photon-counting signals for a selected set of the analog-to-digital converters to the processor.

Photon-counting detector with count-rate dependent multiplexing

A computed tomography (CT) detector apparatus to increase energy resolution at a high count rate includes a plurality of fixed photon-counting detector (PCD) modules arranged in a ring, each PCD module including two Parallel-Transverse-Field (PTF) PCDs that are tilted with respect to a normal direction to a circumferential direction of the ring. Each PTF PCD includes a rectangular semiconductor crystal having a first face and a second face, wherein the first face and the second face are parallel, a cathode side including a cathode electrode covering the first face, and an anode side including a plurality of anode pixels on the second face. Each PTF PCD includes a collimator attached to a predetermined region of the PTF PCD, wherein the collimator blocks incident the X-rays.

Parallel transverse field (PTF) tilted and collimated detectors

A computed tomography (CT) detector apparatus includes a plurality of detectors arranged in a ring, each detector being arranged inside a Faraday cage having a plurality of voltage-biased side-electrodes arranged on a side surface of the Faraday cage. The detectors include photon-counting detectors (PCDs). A voltage applied to the voltage-biased side-electrodes decreases from the anode side of the PCD to the cathode side of the PCD.

Side-electrodes for a Faraday cage on a photon-counting detector array

A computed tomography (CT) image apparatus includes a plurality of photon-counting detectors (PCD); and processing circuitry configured to obtain a photon count of a PCD of the plurality of PCDs, compare the obtained photon count to a predetermined photon-count threshold, and apply an external light source to the PCD when the obtained photon count is larger than the predetermined photon-count threshold.

Method and apparatus for reducing the recovery time due to polarization within an imaging device

An apparatus, method, computer-readable medium, and system for adjusting data acquisition parameters during a scan performed by a Positron Emission Tomography (PET) scanner. The method includes obtaining, during the scan, a current temperature of a detector of the PET scanner, and adjusting, based on the current temperature, the data acquisition parameters used by the PET scanner during the scan.

Apparatus, method, computer-readable medium, and system for adjusting data acquisition parameters during a scan performed by a positron emission tomography scanner

A CT scanner apparatus includes an X-ray source mounted on a gantry of the CT scanner apparatus. The CT scanner apparatus also includes a first X-ray detector mounted on the gantry opposite to the X-ray source, and configured to detect X-rays emitted from the X-ray source and transmitted through an object. The CT scanner apparatus also includes a fixed, sparse array of second X-ray detectors. Each of the second X-ray detectors includes a plurality of stacked scintillators and a photosensor adjacent to a sidewall of the stacked scintillators in a side-readout configuration.

Multiple-layered energy-integrating detector in a hybrid computed tomography scanner

A shock detection device for a detector array includes an accelerometer mounted on the detector array to detect vibrations. The shock detection device also includes an electronic memory to store data from the accelerometer. The data corresponds to detected vibrations that exceed an active threshold of the accelerometer. The shock detection device also includes a power supply that is separate from the power supply of the detector array.

Detection of shock in detector electronics

A method of arranging detector modules within a gamma ray detector apparatus, each detector module including an array of scintillation crystals to convert light into electrical signals, the light being generated in response to incident gamma rays generated by an annihilation event, the method including obtaining performance information of each of the detector modules, and determining a relative location for each of the detector modules within the gamma ray detector based on the obtained performance information of the detector modules.

Apparatus and method for improving uniformity of performance in positron emission tomography

A method to improve light extraction from scintillators in a gamma ray detector, the method including forming a roughened layer on a light-emitting surface of the scintillators, the roughened thin layer having a pillar/column or a corn-shaped structure.

Method to improve light extraction from scintillators

A process and system including a detector having a photosensor therein that outputs a signal and a plurality of after-pulse detector devices independently connected to the photosensor via respective pathways. The after-pulse detector devices each detecting an after-pulse in the signal, where the after-pulse represents an after-event in the photosensor triggered from a previous photon generating event. The system further includes a processing device that receives an indication of the detection of the after-pulse from each of the plurality of after-pulse detector devices and determines a relative delay between the respective pathways based on timing the received indications, and includes a memory that stores the relative delay in association with an identification of the corresponding after-pulse detector devices.

Determining relative timing offset in different electronic pathways using internal signal

Determining relative timing offset in different electronic pathways using internal signals

A photosensor gain detection apparatus that includes a detector including a photosensor configured to output a signal. Also included in the apparatus is an after-pulse/dark-pulse detector device that detects an after-pulse or a dark-pulse in the signal output by the photosensor, and outputs an indication signal when the after-pulse or the dark-pulse is detected, the after-pulse and the dark-pulse representing after-events in the photosensor triggered from a previous photon generating event. The apparatus additionally includes an integrator device that integrates the signal output by the photosensor and to output an integrated signal, a histogram device connected to the integrator and the after-pulse/dark-pulse detector device, and that generates a histogram from the integrated signal and the indication signal, a gain determination device that determines a gain of the photosensor based on the generated histogram, and a memory configured to store the determined gain.

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Grayslake, IL, United States of America

Gin Chung Wang