EP-4738267-A1 - IMAGE RECONSTRUCTION METHOD AND APPARATUS

EP4738267A1EP 4738267 A1EP4738267 A1EP 4738267A1EP-4738267-A1

Abstract

An image reconstruction method includes: acquiring raw scan data of a scan object by a scanning system, the scanning system including a detector, correcting the raw scan data based on at least one of scan-motion-associated correction factors to obtain corrected raw scan data, the scan-motion-associated correction factors being associated with scanning durations of a plurality of voxels of the scan object or scanning durations of a plurality of pixels of the detector, and performing image reconstruction on the corrected raw scan data to obtain a scan image of the scan object.

Inventors

TANG, Songsong
SHI, LEI
WANG, Beien
Liu, Zhongzhi
SUN, Youjun
DONG, Yun

Assignees

Shanghai United Imaging Healthcare Co., Ltd.

Dates

Publication Date: 20260506
Application Date: 20251030

Claims (15)

An image reconstruction method, comprising, acquiring raw scan data of a scan object by a scanning system, the scanning system comprising a detector; correcting the raw scan data based on at least one of scan-motion-associated correction factors to obtain corrected raw scan data, the scan-motion-associated correction factors being associated with scanning durations of a plurality of voxels of the scan object or scanning durations of a plurality of pixels of the detector; and performing image reconstruction based on the corrected raw scan data to obtain a scan image of the scan object.
The image reconstruction method according to claim 1, wherein the raw scan data are acquired, on a condition that the scanning system, during a single scanning process, configures at least two different scanning durations respectively for the plurality of voxels of the scan object or the plurality pixels of the detector.
The image reconstruction method according to claim 2, wherein the scanning system further comprises a scanning bed, and acquiring the raw scan data of the scan object by the scanning system comprises: controlling the scanning bed to perform a movement along a horizontal axis to obtain the raw scan data.
The image reconstruction method according to claim 3, wherein the movement comprises at least one of a stepwise movement and a continuous movement.
The image reconstruction method according to any one of claims 3 to 4, wherein the scan-motion-associated correction factors comprise correction factors corresponding to different voxels of the scan object; and before correcting the raw scan data based on at least one of the scan-motion-associated correction factors, the method further comprises: acquiring start scan time points and end scan time points corresponding to the scanning durations of the plurality of voxels of the scan object; and determining, based on the start scan time points and the end scan time points, correction factors corresponding to the voxels of the scan object.
The image reconstruction method according to claim 5, wherein determining, based on the start scan time points and the end scan time points, the correction factors corresponding to the voxels of the scan object comprises: calculating an average moving speed of the scanning bed based on the start scan time points and the end scan time points corresponding to the voxels; and generating the correction factors corresponding to the voxels based on the start scan time points, the end scan time points, the average moving speed, and a nuclide half-life of a nuclide in the scan object.
The image reconstruction method according to claim 2, wherein acquiring the raw scan data of the scan object by the scanning system comprises: controlling the detector to rotate relative to a horizontal axis to obtain the raw scan data.
The image reconstruction method according to claim 7, wherein the scan-motion-associated correction factors comprise correction factors corresponding to different pixels of the detector; and correcting the raw scan data based on the at least one of scan-motion-associated correction factors to obtain the corrected raw scan data comprises: generating a likelihood function corresponding to the raw scan data based on the scanning durations and the correction factors; and correcting the raw scan data based on the likelihood function to obtain the corrected raw scan data.
The image reconstruction method according to claim 8, wherein correcting the raw scan data based on the likelihood function to obtain the corrected raw scan data comprises: acquiring, on a condition that the likelihood function takes a maximum value, predicted scan data corresponding to the raw scan data, and using the predicted scan data as the corrected raw scan data.
The image reconstruction method according to any one of claims 1 to 6, wherein acquiring the raw scan data of the scan object by the scanning system comprises: acquiring a plurality of scan regions of the scan object; determining scanning durations of the scanning system for the plurality of scan regions; and performing scanning based on the scanning durations of the scanning system for the plurality of scan regions to acquire the raw scan data.
The image reconstruction method according to claim 10, wherein performing scanning based on the scanning durations of the scanning system for the plurality of scan regions to acquire the raw scan data comprises: determining scanning moving speeds or scanning residence durations of the detector for the plurality of scan regions, based on the scanning durations of the scanning system for the plurality scan regions; and performing scanning based on the scanning moving speeds or the scanning residence durations to acquire the raw scan data.
The image reconstruction method according to any one of claims 10 to 11, wherein the scan regions are divided based on scanning requirements of the scan object; or wherein the scan regions are divided based on an anatomical structure of the scan object.
An image reconstruction apparatus, comprising: a data acquisition module configured to acquire raw scan data of a scan object by a scanning system, the scanning system comprising a detector; a correction module configured to correct the raw scan data based on at least one of scan-motion-associated correction factors to obtain corrected raw scan data, the scan-motion-associated correction factors being associated with scanning durations of a plurality of voxels of the scan object or scanning durations of a plurality of pixels of the detector; and a reconstruction module configured to perform image reconstruction based on the corrected raw scan data to obtain a scan image of the scan object.
A computer device comprising a memory and a processor, wherein the memory stores a computer program, and the processor, when executing the computer program, performs the image reconstruction method according to any one of claims 1 to 12.
A non-transitory computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, causes the processor to perform the image reconstruction method according to any one of claims 1 to 12.

Description

TECHNICAL FIELD The present disclosure relates to the field of image reconstruction technologies, and in particular, to an image reconstruction method and apparatus. BACKGROUND Single Photon Emission Computed Tomography (SPECT) is a relatively mature imaging technology in the field of nuclear medicine and has been widely used in clinical testing. For scanning scenarios, in related technologies, uniform scanning of the detection object is mainly achieved by moving a probe and a bed to obtain a scan image of the detection object. However, for non-uniform scanning requirements, the quality of the scan image obtained by methods in the related art is poor. SUMMARY In a first aspect, an image reconstruction method is provided in the present disclosure, and the method includes: acquiring raw scan data of a scan object by a scanning system, the scanning system including a detector;correcting the raw scan data based on at least one of scan-motion-associated correction factors to obtain corrected raw scan data, the scan-motion-associated correction factors being associated with scanning durations of a plurality of voxels of the scan object or scanning durations of a plurality of pixels of the detector; andperforming image reconstruction based on the corrected raw scan data to obtain a scan image of the scan object. In some embodiments, the raw scan data are acquired, on a condition that the scanning system, during a single scanning process, configures at least two different scanning durations respectively for the plurality of voxels of the scan object or the plurality pixels of the detector ∘ In some embodiments, the scanning system further includes a scanning bed, and acquiring the raw scan data of the scan object by the scanning system includes controlling the scanning bed to perform a movement along a horizontal axis to obtain the raw scan data. In some embodiments, the movement includes at least one of a stepwise movement and a continuous movement. In some embodiments, the scan-motion-associated correction factors include correction factors corresponding to different voxels of the scan object; and before correcting the raw scan data based on at least one of the scan-motion-associated correction factors, the method further includes: acquiring start scan time points and end scan time points corresponding to the scanning durations of the plurality of voxels of the scan object; anddetermining, based on the start scan time points and the end scan time points, correction factors corresponding to the voxels of the scan object. In some embodiments, determining, based on the start scan time points and the end scan time points, the correction factors corresponding to the voxels of the scan object includes: calculating an average moving speed of the scanning bed based on the start scan time points and the end scan time points corresponding to the voxels; andgenerating the correction factors corresponding to the voxels based on the start scan time points, the end scan time points, the average moving speed, and a nuclide half-life of a nuclide in the scan object. In some embodiments, acquiring the raw scan data of the scan object by the scanning system includes controlling the detector to rotate relative to a horizontal axis to obtain the raw scan data. In some embodiments, the scan-motion-associated correction factors include correction factors corresponding to different pixels of the detector. Correcting the raw scan data based on the at least one of scan-motion-associated correction factors to obtain the corrected raw scan data includes: generating a likelihood function corresponding to the raw scan data based on the scanning durations and the correction factors; andcorrecting the raw scan data based on the likelihood function to obtain the corrected raw scan data. In some embodiments, correcting the raw scan data based on the likelihood function to obtain the corrected raw scan data includes: on a condition that the likelihood function takes a maximum value, acquiring predicted scan data corresponding to the raw scan data, and using the predicted scan data as the corrected raw scan data. In some embodiments, acquiring the raw scan data of the scan object by the scanning system includes: acquiring a plurality of scan regions of the scan object;determining scanning durations of the scanning system for the plurality of scan regions; andperforming scanning based on the scanning durations of the scanning system for the plurality of scan regions to acquire the raw scan data. In some embodiments, performing scanning based on the scanning durations of the scanning system for the plurality of scan regions to acquire the raw scan data includes: determining scanning moving speeds or scanning residence durations of the detector for the plurality of scan regions, based on the scanning durations of the scanning system for the plurality scan regions; andperforming scanning based on the scanning moving speeds or the scanning residence du