Zhiqiang Hu

US Patent:

20210375009, Dec 2, 2021

Filed:

Jan 24, 2019

Appl. No.:

16/963343

Inventors:

- EINDHOVEN, NL
Xiyun SONG - CUPERTINO CA, US
Chuanyong BAI - SOLON OH, US
Andriy ANDREYEV - WILLOUGHBY HILLS OH, US
Chi-Hua TUNG - AURORA OH, US
Zhiqiang HU - TWINSBURG OH, US

International Classification:

G06T 11/00

Abstract:

A non-transitory computer-readable medium stores instructions readable and executable by a workstation () including at least one electronic processor () to perform an image reconstruction method (). The method includes: generating, from received imaging data, a plurality of intermediate images reconstructed without scatter correction from data partitioned into different energy windows; generating a fraction of true counts and a fraction of scatter events in the generated intermediate images; generating a final reconstructed image from the intermediate images, the fraction of true counts in the intermediate images, and the fraction of scatter counts in the intermediate images; and at least one of controlling the non-transitory computer readable medium to store the final image and control a display device () to display the final image.

US Patent:

20210366165, Nov 25, 2021

Filed:

Jan 24, 2019

Appl. No.:

16/963307

Inventors:

- ElNDHOVEN, NL
Jinghan YE - LIVERMORE CA, US
Yanfei MAO - HIGHLAND HEIGHTS OH, US
Chuanyong BAI - SOLON OH, US
Andriy ANDREYEV - WILLOUGHBY HILLS OH, US
Gregory DOUGHTY - BEACHWOOD OH, US
Leonid ROMANOV - MAYFIELD HEIGHTS OH, US
Zhiqiang HU - TWINSBURG OH, US

International Classification:

G06T 11/00
G01T 1/17

Abstract:

A non-transitory computer-readable medium stores instructions readable and executable by a workstation () including at least one electronic processor () to perform an image reconstruction method (). The method includes: determining singles rates of a plurality of radiation detectors () in a frame of imaging data detected by the radiation detectors; determining an energy correction factor (N) for each detector for each radiation detector based on an energy spectrum distribution of gamma rays incident on the radiation detector during acquisition of the frame of imaging data; determining a singles live time correction factor for each radiation detector from the singles rate and the energy correction factor determined for the radiation detector; determining a system coincidence live time correction factor from the system singles rate; for each line of response (LOR) of a plurality of LORs connecting pairs of radiation detectors, determining a live time correction factor for the LOR from the determined singles live time correction factors of the pair of radiation detectors connected by the LOR and the determined system coincidence live time correction factor; and reconstructing the frame of imaging data using the determined LOR live time correction factors.

US Patent:

20200286266, Sep 10, 2020

Filed:

Sep 20, 2018

Appl. No.:

16/648397

Inventors:

- EINDHOVEN, NL
JINGHAN YE - LIVERMORE CA, US
ANDRIY ANDREYEV - HIGHLAND HEIGHTS OH, US
CHUANYONG BAI - SOLON OH, US
ZHIQIANG HU - TWINSBURG OH, US

International Classification:

G06T 11/00
G01T 1/29
G06T 7/00
A61B 6/03

Abstract:

A non-transitory storage medium stores instructions readable and executable by an electronic processor () to perform a method () for estimating singles rates for detectors () of a detector array () of a positron emission tomography (PET) imaging device (). The method includes: obtaining measured delayed coincidence rates for lines of response (LORs) defined by pairs of the detectors of the detector array; and generating estimated singles rates for the detectors of the detector array by an iterative optimization in which each iteration performs an update of estimates of the singles rates for the detectors by operations including: forward projecting the estimates of the singles rates for the detectors to generate estimates of delayed coincidence rates for the LORs; generating quantitative comparisons between the measured delayed coincidence rates for the LORs and the generated estimates of the delayed coincidence rates for the LORs; backprojecting the quantitative comparisons to generate corrections for the singles rates for the detectors; and updating the estimates of the singles rates for the detectors using the generated corrections. The estimated singles rates for the detectors of the detectors array comprise the estimates of the singles rates for the detectors output by the iterative optimization when the iterative optimization satisfies a stopping criterion. This process jointly optimizes the estimated singles rates and randoms estimation.

US Patent:

20160350945, Dec 1, 2016

Filed:

Feb 18, 2015

Appl. No.:

15/117550

Inventors:

- Eindhoven, NL
Jinghan YE - CUPERTINO CA, US
Zhiqiang HU - TWINSBURG OH, US
Changhong DAI - WILLOUGHBY HILLS OH, US
Varun VERMA - CLEVELAND OH, US
Chi-Hua TUNG - AURORA OH, US

Assignee:

Koninklijke Philips N.V. - Eindhoven

International Classification:

G06T 11/00
G06T 5/00
G06T 5/20

Abstract:

A system () and a method () iteratively reconstruct an image of a target volume of a subject. In each iteration of a plurality of iterations, an estimate image of the target volume () is forward projected () and compared () to received event data () to determine a discrepancy (). The discrepancy () is back projected () and the back projection () updates () the estimate image (). In at least one iteration, the estimate image () is filtered () in the image domain prior to being back projected.