US 12,277,684 B2
K-space based method for reducing noise and dose of radiation or contrast for perfusion imaging
Danny J J Wang, Calabasas, CA (US)
Assigned to HURA IMAGING, INC, Calabasas, CA (US)
Filed by HURA IMAGING, INC, Calabasas, CA (US)
Filed on Jan. 13, 2022, as Appl. No. 17/574,988.
Application 17/574,988 is a continuation of application No. PCT/US2020/045285, filed on Aug. 6, 2020.
Claims priority of provisional application 63/038,071, filed on Jun. 11, 2020.
Claims priority of provisional application 62/884,953, filed on Aug. 9, 2019.
Prior Publication US 2022/0180482 A1, Jun. 9, 2022
Int. Cl. G06T 5/00 (2024.01); G06T 5/70 (2024.01); G06T 11/00 (2006.01)
CPC G06T 5/70 (2024.01) [G06T 11/006 (2013.01); G06T 2207/10081 (2013.01); G06T 2207/10088 (2013.01)] 8 Claims
OG exemplary drawing
 
1. An apparatus for reducing radiation dose and noise during CT, comprising:
(a) a CT scanner;
(b) a processor configured to receive input from the CT scanner; and
(c) a non-transitory memory storing instructions executable by the processor;
(d) wherein said instructions, when executed by the processor, perform steps comprising:
(i) receiving a CT sinogram or image from the CT scanner;
(ii) converting the CT sinogram or image into k-space data, wherein said k-space data comprises a plurality of timeframes t0, t1, t2, . . . tn, and wherein t0 is a time frame index;
(iii) performing projection view-sharing methods on the k-space data by progressively increasing the number of time frames for view-shared averaging for more distant regions of k-space, comprising
dividing the k-space into a center k-space region and a plurality of successive outer k-space regions,
wherein the center k-space region utilizes k-space data from only one time frame (t1) to maintain image contrast and temporal resolution of said timeframes t0, t1, t2, . . . tn, and
progressively increasing the number of neighboring time frames for averaging outer k-space regions to reduce noise and increase SNR; and
(e) outputting a CT image at a decreased or standard radiation dosage while increasing SNR and preserving high-spatial and temporal resolutions.