公开(公告)号：US20220361833A1

公开(公告)日：2022-11-17

申请号：US17725242

申请日：2022-04-20

Applicant: Analog Devices, Inc.

Inventor： Matthew A. WOODRUFF ,  Patrick S. RIEHL

IPC: A61B6/00 ,  A61B6/03 ,  G01T1/24

Abstract: One embodiment is circuitry for implementing a baseline restoration (“BLR”) circuit for a photon-counting computed tomography (“PCCT”) signal chain, the circuitry comprising a multi-level discriminator circuit for receiving a shaper voltage from the PCCT signal chain, the discriminator circuit outputting a digital signal indicative of one of a range of voltages within which the shaper voltage falls; a digital-to-analog converter (“DAC”) connected to receive the digital signal output from the discriminator circuit, the DAC converting the received digital signal to a corresponding active reference voltage; and a feedback circuit that injects a cancellation current proportional to the difference between the shaper voltage and the active reference voltage at the input of the PCCT signal chain.

公开(公告)号：US20240188918A1

公开(公告)日：2024-06-13

申请号：US18065385

申请日：2022-12-13

Applicant: Analog Devices, Inc.

Inventor： Sunrita PODDAR ,  Patrick S. RIEHL ,  Matthew A. WOODRUFF

IPC: A61B6/00 ,  G01R29/027

CPC classification number: A61B6/5258 ,  G01R29/0273 ,  A61B2560/0223

Abstract: One embodiment is a method of deconvolving overlapping first and second pulses in a photon-counting CT scanning system, the method comprising detecting a first pulse event having a first detected level; detecting a second pulse event having a second detected level; determining an amount of time that elapses between the detected first pulse event and the detected second pulse event; and reconstructing the first pulse and the second pulse using the first and second detected levels, the duration of time between the first and second pulse events, and a known pulse shape.

公开(公告)号：US20230228888A1

公开(公告)日：2023-07-20

申请号：US18065045

申请日：2022-12-13

Applicant: Analog Devices, Inc.

Inventor： Patrick S. RIEHL ,  Sunrita PODDAR

IPC: G01T1/17 ,  A61B6/00 ,  A61B6/03

CPC classification number: G01T1/17 ,  A61B6/032 ,  A61B6/4241

Abstract: One embodiment is a method for counting charge events detected by a pixel in a photon-counting computed tomography (PCCT) scanning system comprising a plurality of discriminators, wherein each discriminator is associated with a respective one of a plurality of threshold voltage levels. The method includes detecting a signal output from one of the discriminators; incrementing a quantitative count corresponding to the threshold voltage level associated with the one of the discriminators if the detected discriminator output signal meets a first condition; and incrementing a qualitative count if the detected discriminator output signal meets at least one second condition.