公开(公告)号：US12287437B2

公开(公告)日：2025-04-29

申请号：US18065045

申请日：2022-12-13

Applicant: Analog Devices, Inc.

Inventor： Patrick S. Riehl ,  Sunrita Poddar

IPC: G01T1/17 ,  A61B6/03 ,  A61B6/42

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.

公开(公告)号：US12161498B2

公开(公告)日：2024-12-10

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 ,  A61B6/42 ,  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.