CN114359434A - Image reconstruction method and device - Google Patents

Abstract

The present disclosure relates to an image reconstruction method and apparatus, an electronic device, a computer-readable storage medium, and a computer program product. The method comprises the following steps: initiating a scan of the tissue under test in a first direction from a first end to a second end over a first time comprising a plurality of cardiac cycles to obtain a plurality of data sets corresponding to the plurality of cardiac cycles; for each cardiac cycle of a plurality of cardiac cycles, obtaining a set of tracks of a partial region of the tissue to be tested scanned in the cardiac cycle based on a corresponding data set in the plurality of data sets; for any two adjacent cardiac cycles in the multiple cardiac cycles, obtaining a matching time point in each of the two adjacent cardiac cycles based on the two track sets corresponding to the two adjacent cardiac cycles; and obtaining a reconstructed image of the tissue under test from the first end to the second end of the tissue under test based on the matched time points in each of the plurality of cardiac cycles.

Description

Image reconstruction method and device

Technical Field

The present disclosure relates to the field of medical device technology, and in particular, to a method and an apparatus for image reconstruction, an electronic device, a computer-readable storage medium, and a computer program product.

Background

Computed Tomography (CT) technology is widely used in various medical examinations. The clear image of the tested tissue obtained by the computer tomography is helpful for helping doctors to make accurate judgment.

Cardiac CTA is the first line of examination in the diagnosis of cardiac disease. Cardiac CTA obtains coronary images by computed tomography of the coronary vessels of the heart. The quality of the coronary images is influenced by many factors, such as the time resolution of the device, the heart rate and rhythm of the heart under test, etc.

The approaches described in this section are not necessarily approaches that have been previously conceived or pursued. Unless otherwise indicated, it should not be assumed that any of the approaches described in this section qualify as prior art merely by virtue of their inclusion in this section. Similarly, unless otherwise indicated, the problems mentioned in this section should not be considered as having been acknowledged in any prior art.

Disclosure of Invention

According to an aspect of the embodiments of the present disclosure, an image reconstruction method is provided, including: initiating a scan of a tissue under test in a first direction from a first end to a second end over a first time comprising a plurality of cardiac cycles to obtain a plurality of data sets corresponding to the plurality of cardiac cycles, wherein a partial region of the tissue under test is scanned in each of the plurality of cardiac cycles and the scanned partial regions of the tissue under test in any two adjacent cardiac cycles partially overlap in the first direction; for each of the plurality of cardiac cycles, obtaining a set of trajectories in the cardiac cycle for the scanned partial region of the measured tissue in the cardiac cycle based on a corresponding data set in the plurality of data sets, the set of trajectories indicating positions in space of the scanned partial region of the measured tissue in the cardiac cycle at different points in time in the cardiac cycle; for any two adjacent cardiac cycles in the multiple cardiac cycles, obtaining a matching time point in each of the two adjacent cardiac cycles based on two track sets corresponding to the two adjacent cardiac cycles, wherein the positions of the measured tissue in space are matched at the matching time point in the first cardiac cycle and the matching time point in the second cardiac cycle in the two adjacent cardiac cycles; and obtaining a measured tissue reconstruction image of the measured tissue from the first end to the second end based on the corresponding matching time point of each cardiac cycle in the plurality of cardiac cycles.

In another aspect of the disclosed embodiments, an image reconstruction apparatus is provided, including: a scan initiating unit configured to initiate scanning of a tissue under test from a first end to a second end along a first direction over a first time comprising a plurality of cardiac cycles to obtain a plurality of data sets corresponding to the plurality of cardiac cycles, wherein a partial region of the tissue under test is scanned in each of the plurality of cardiac cycles and the partial regions of the tissue under test scanned in any two adjacent cardiac cycles partially overlap; a trajectory acquisition unit configured to obtain, for each of the plurality of cardiac cycles, a set of trajectories within the cardiac cycle for the scanned partial region of the measured tissue within the cardiac cycle, the set of trajectories indicating positions in space of the scanned partial region of the measured tissue within the cardiac cycle at different points in time within the cardiac cycle; a matching unit configured to, for any two adjacent cardiac cycles in the plurality of cardiac cycles, obtain a matching time point in each of the two adjacent cardiac cycles based on two trajectory sets corresponding to the two adjacent cardiac cycles, where positions of the tissue to be measured in space match at the matching time point in a first cardiac cycle and the matching time point in a second cardiac cycle of the two adjacent cardiac cycles; and an image reconstruction unit configured to obtain a measured tissue reconstruction image of the measured tissue from the first end to the second end based on the matching time point corresponding to each of the plurality of cardiac cycles and the plurality of data sets.

According to another aspect of the embodiments of the present disclosure, there is provided an electronic device including: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores a computer program that, when executed by the at least one processor, implements a method according to an embodiment of the disclosure.

According to another aspect of embodiments of the present disclosure, a non-transitory computer-readable storage medium is presented storing a computer program, wherein the computer program, when executed by a processor, implements a method according to embodiments of the present disclosure.

According to another aspect of embodiments of the present disclosure, a computer program product is presented, comprising a computer program, wherein the computer program, when executed by a processor, implements a method according to embodiments of the present disclosure.

According to one or more embodiments of the present disclosure, the reconstructed image after the computed tomography of the heart has no fault layer, so that the reconstructed image is accurate, thereby helping a doctor make an accurate judgment.

It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present disclosure, nor do they limit the scope of the present disclosure. Other features of the present disclosure will become apparent from the following description.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the embodiments and, together with the description, serve to explain the exemplary implementations of the embodiments. The illustrated embodiments are for purposes of illustration only and do not limit the scope of the claims. Throughout the drawings, identical reference numbers designate similar, but not necessarily identical, elements.

The above and other features and advantages of the present disclosure will become more apparent to those of ordinary skill in the art by describing in detail embodiments thereof with reference to the attached drawings, in which:

FIG. 1 is a schematic flow chart diagram of an image reconstruction method according to an embodiment of the present disclosure;

fig. 2 is a schematic view of a reconstructed image obtained according to an image reconstruction method of the related art;

FIG. 3 is a schematic diagram of a reconstructed image obtained by an image reconstruction method according to an embodiment of the present disclosure;

fig. 4 is a flowchart of a process of obtaining a set of trajectories of a partial region of a tissue under test scanned in a cardiac cycle in the cardiac cycle in an image reconstruction method according to an embodiment of the present disclosure;

FIG. 5 is a schematic illustration of a set of trajectories of coronary vessels in a cardiac cycle;

fig. 6 is a schematic diagram of obtaining matching time points in each of the two adjacent cardiac cycles in an image reconstruction method according to an embodiment of the present disclosure;

FIG. 7 is a schematic diagram of a reconstructed image of the tissue under test obtained in an image reconstruction method according to an embodiment of the disclosure; and

fig. 8 is a schematic block diagram of an image reconstruction apparatus according to an embodiment of the present disclosure.

Detailed Description

For a more clear understanding of the technical features, objects, and effects of the present disclosure, embodiments of the present disclosure will now be described with reference to the accompanying drawings, in which like reference numerals refer to like parts throughout.

"exemplary" means "serving as an example, instance, or illustration" herein, and any illustration, embodiment, or steps described as "exemplary" herein should not be construed as a preferred or advantageous alternative.

For the sake of simplicity, only the parts relevant to the present disclosure are schematically shown in the drawings, and they do not represent the actual structure as a product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled.

In this document, "one" means not only "only one" but also a case of "more than one". In this document, "first", "second", and the like are used only for distinguishing one from another, and do not indicate the degree of importance and order thereof, and the premise that each other exists, and the like.

According to one aspect of the present disclosure, an image reconstruction method is provided. Referring to fig. 1, an image reconstruction method 100 according to some embodiments includes:

step S110: initiating scanning of a tissue under test in a first direction from a first end to a second end for a first time comprising a plurality of cardiac cycles to obtain a plurality of data sets corresponding to the plurality of cardiac cycles, wherein a partial region of the tissue under test is scanned in each of the plurality of cardiac cycles and the scanned partial regions of the tissue under test in any two adjacent cardiac cycles partially overlap in the first direction;

step S120: for each of the plurality of cardiac cycles, obtaining a set of trajectories in the cardiac cycle for the scanned partial region of the measured tissue in the cardiac cycle based on a corresponding data set in the plurality of data sets, the set of trajectories indicating positions in space of the scanned partial region of the measured tissue in the cardiac cycle at different points in time in the cardiac cycle;

step S130: for any two adjacent cardiac cycles in the multiple cardiac cycles, obtaining a matching time point in each of the two adjacent cardiac cycles based on two track sets corresponding to the two adjacent cardiac cycles, wherein the positions of the measured tissue in space are matched at the matching time point in the first cardiac cycle and the matching time point in the second cardiac cycle in the two adjacent cardiac cycles;

step S140: obtaining a reconstructed image of the tissue under test from the first end to the second end of the tissue under test based on the matched time points in each of the plurality of cardiac cycles.

Reconstruction of an image of the entire tissue under test is achieved by performing a computed tomography scan of the entire tissue under test (e.g., coronary heart pulses) in a plurality of cardiac cycles during the computed tomography scan, obtaining a trajectory in each cardiac cycle from the scanned data, and obtaining matching time points at which the tissue under test is located at matching positions in adjacent cardiac cycles during the scan based on the trajectories. Therefore, the reconstructed image can not be in a wrong layer due to the fact that the detected tissue can be located at different positions in different cardiac cycles, the detected tissue is complete and accurate in the reconstructed image, and the reconstructed image is clear, so that the method is helpful for assisting a doctor to make accurate judgment.

In the related art, during scanning of the coronary heart, it is often necessary to perform a computed tomography scan across a plurality of cardiac cycles in order to obtain scan data corresponding to the whole of the coronary heart. Since during motion in different cardiac cycles, the coronary arteries of the heart (e.g. the main trunk of the right coronary artery in the right coronary artery) tend to be in different positions at the same point in time or phase (e.g. phase 56ms or 70% in one cardiac cycle) within the cardiac cycle, e.g. calculated from the start of one R-wave. In the image reconstruction process, the condition of the heart motion, such as the rhythm or heart rate of the heart motion, is often inferred by analyzing the electrocardiographic signals based on the coupling relationship between the heart motion and the electrocardiographic signals, so as to reconstruct an image in which the heart motion is frozen, for example, by selecting the same time point or phase in a plurality of cardiac cycles through the electrocardiographic signals, and obtaining a reconstructed image of the entire heart coronary artery based on the reconstructed image at the same time point or phase, because the reconstructed image is obtained based on data of the heart coronary artery at different positions acquired at the same phase in the plurality of cardiac cycles, the reconstructed image of the entire heart coronary artery shows a fault phenomenon (see the position indicated by arrow a) as shown in fig. 2, wherein the coronary artery is discontinuous in the reconstructed image, and a fault artifact is generated. In addition, in a disease state, the coupling between the heart motion and the cardiac electrical signal may disappear, so that the motion of the coronary artery of the heart in each cardiac cycle may be different, so that the coronary artery of the heart is located at different positions at the same time point or phase in a plurality of cardiac cycles selected based on the cardiac electrical signal, and the image reconstructed based on the reconstructed image at the same selected time point or phase also has a fault layer artifact or a motion artifact.

In an embodiment according to the present disclosure, in image reconstruction based on scan data obtained by computed tomography scanning across a plurality of cardiac cycles, first, motion trajectories of coronary arteries in respective cardiac cycles are obtained from the scan data, matching time points at which the coronary arteries are located at spatially matching positions in a plurality of time points in different cardiac cycles are obtained based on the motion trajectories, and a reconstructed image of the entire cardiac coronary artery is obtained by image reconstruction using the matching time points in the different cardiac cycles, and since the reconstructed image is obtained based on data acquired at the matching time points of the plurality of cardiac cycles that the cardiac coronary arteries are located at the matching positions, the reconstructed image of the entire cardiac coronary artery does not have a wrong layer, as shown in fig. 3, in which the coronary arteries are continuous in the reconstructed image, the wrong layer artifact is eliminated.

In some embodiments, the tissue being tested is a heart. In other embodiments, the tissue under test may also be tissue whose location is affected by the beating of the heart, such as the lungs.

In some embodiments, the tissue under test comprises one of the coronary arteries of the heart. The coronary arteries of the heart include the left and right coronary arteries. For example, the left coronary artery includes: the left coronary trunk (LMT), anterior descending branch (LAD), circumflex branch (LCX), blunt limbic branch (LMB), diagonal branch (D), etc.; the right coronary artery includes: the right coronary artery trunk (RCA), posterior descending branch (PDA), and acute limbus branch (PLB).

In some embodiments, the plurality of data sets corresponding to the plurality of cardiac cycles are obtained in step S110 by a Computed Tomography (CT) apparatus, wherein the CT apparatus may be single-source or dual-source, and is not limited herein.

In some embodiments, in step S110, the computed tomography scan is assisted by an electrocardiographic gating (ECG) technique, so that the computed tomography apparatus scans a partial region of the heart in the first direction corresponding to each cardiac cycle, thereby obtaining a plurality of data sets corresponding to a plurality of cardiac cycles. Wherein the rhythm or heart rate of the heart is obtained by an electrocardiographic gating technique, and the time length of each of a plurality of cardiac cycles or the phase of the heart motion (including the systolic phase and the diastolic phase) is obtained.

In some embodiments, in step S110, after obtaining scan data for a first time period by the computed tomography device, a plurality of cardiac cycles for the first time period are obtained, and the scan data is divided into a plurality of data sets corresponding to the plurality of cardiac cycles based on the plurality of cardiac cycles.

In some embodiments, the first direction is a top-to-bottom direction of the heart as shown in fig. 3.

In some embodiments, as shown in fig. 4, the step S120 of obtaining a trace set of the partial region of the tested tissue scanned in the cardiac cycle includes:

step S410: obtaining a plurality of reconstructed images of the partial region of the tissue under test scanned in the cardiac cycle corresponding to a plurality of phases of the cardiac cycle based on corresponding data sets in the plurality of data sets; and

step S420: based on the plurality of reconstructed images, a track set of the partial area of the tested tissue scanned in the cardiac cycle is obtained.

The method comprises the steps of obtaining a track set of a measured tissue in a cardiac cycle based on a plurality of reconstructed images of the measured tissue corresponding to a plurality of phases in the cardiac cycle, wherein the plurality of reconstructed images correspond to a plurality of phases in the cardiac cycle, and the plurality of reconstructed images correspond to positions of the measured tissue in space at different time points.

In some embodiments, the plurality of phases within a cardiac cycle are obtained by acquiring one phase at every predetermined time length in the time length of one cardiac cycle. For example, in one cardiac cycle, one phase is acquired every 1% of the time length of one cardiac cycle, so that 100 phases can be obtained.

In some embodiments, the step 410 of obtaining a plurality of reconstructed images of the partial region of the tissue under test scanned in the cardiac cycle corresponding to a plurality of phases of the cardiac cycle comprises: for a plurality of phases in the cardiac cycle, reconstructed images corresponding to the same section on the measured tissue are obtained based on the corresponding data, respectively. Thereby, the step S420 of obtaining a trajectory set of the partial region of the measured tissue scanned in the cardiac cycle based on the plurality of reconstructed images includes: obtaining the position of the center of the same section at each phase in the multiple phases based on the reconstructed image corresponding to the same section on the tested tissue; and obtaining a set of trajectories in the cardiac cycle for the scanned partial region of the measured tissue in the cardiac cycle based on the position of the center of the same cross-section at each of the plurality of phase phases.

In some embodiments, the same cross-section is simultaneously located in a partial region of the tissue being measured scanned in each of two adjacent cardiac cycles of the plurality of cardiac cycles. Since the partial areas of the tissue to be measured scanned in two adjacent cardiac cycles are partially overlapped in the first direction, the same cross section is simultaneously located in the partial area of the tissue to be measured scanned in each of two adjacent cardiac cycles in the multiple cardiac cycles, namely, the same cross section is located in the overlapped area of the partial areas of the tissue to be measured scanned in the two adjacent cardiac cycles in the first direction, and the position of the same cross section in the space can indicate the position of the overlapped area in the space, and further indicate the position of the tissue to be measured in the space.

In some examples, the method of obtaining a reconstructed image of the same section of the measured tissue includes a weighted filtered back projection technique or an iterative reconstruction technique. In some embodiments, the reconstructed image is obtained by a data processing device, such as a processor.

Since a plurality of reconstructed images corresponding to a plurality of phases of the measured tissue in a cardiac cycle correspond to positions of the measured tissue in space at different time points, based on the relative position between the computed tomography device and the measured tissue and each reconstructed image, the positions of partial regions of the measured tissue scanned in the cardiac cycle contained in the reconstructed image in space can be obtained, for example, the positions of the center or the edge of a cross section of the coronary artery of the heart can be obtained when the reconstructed image shows the cross section. Therefore, the track set of the tested tissue in one cardiac cycle can be obtained based on a plurality of reconstructed images corresponding to a plurality of phases of the tested tissue in one cardiac cycle.

In some examples, for each of a plurality of cardiac cycles, the set of trajectories within the cardiac cycle includes location coordinates of a center point of each of a plurality of cross sections in the scanned fractional region of the measured tissue within the cardiac cycle; that is, the trajectory set includes a plurality of position coordinates of a plurality of center points. In some embodiments, the plurality of cross-sections may be simultaneously located in a partial region of the tissue under test scanned for each of two adjacent cardiac cycles in the plurality of cardiac cycles.

In other examples, for each of a plurality of cardiac cycles, the set of trajectories within the cardiac cycle includes coordinates of respective points on a plurality of cross sections of the scanned partial region of the measured tissue within the cardiac cycle, i.e., the set of trajectories includes a plurality of coordinates of points on each of the plurality of cross sections.

In some embodiments, the step S410 of obtaining a plurality of reconstructed images of the partial region of the tissue to be tested scanned in the cardiac cycle corresponding to a plurality of phases of the cardiac cycle includes: three-dimensional reconstructed images of the partial regions of the examined tissue scanned during the cardiac cycle. The three-dimensional reconstructed image may be, for example, an image obtained by 3D rendering based on a reconstructed image of each of a plurality of cross sections of the partial region.

In some embodiments, for each of a plurality of cardiac cycles, the set of trajectories within the cardiac cycle includes a plurality of trajectory regions corresponding to a plurality of phases within the cardiac cycle, each trajectory region of the plurality of trajectory regions indicating a region in space occupied by the portion of the tissue being measured scanned within the cardiac cycle at the corresponding phase.

In some embodiments, a plurality of trajectory regions corresponding to a plurality of phases in a respective cardiac cycle are obtained by three-dimensionally reconstructing images of a scanned fractional region of the measured tissue in the cardiac cycle. For example, the trajectory region is rendered in a three-dimensional space coordinate system based on the position coordinates of a plurality of points of the measured tissue surface in the three-dimensional reconstructed image.

Referring to fig. 5, a plurality of trajectory regions of the coronary artery in three-dimensional space corresponding to a plurality of phases within one cardiac cycle, for example, a plurality of trajectory regions of the right coronary artery trunk (RCA) corresponding to a plurality of phases includes: track area 510 and 513; the plurality of trajectory regions corresponding to the plurality of epochs at the posterior descending branch (PDA) comprises: track area 520- > 523.

It should be noted that the plurality of trajectory regions corresponding to the plurality of phase phases, which are shown in fig. 5 as the whole of the cardiac coronary artery (e.g., the whole of the stem of the Right Coronary Artery (RCA) and the posterior descending branch (PDA)), are merely exemplary, and those skilled in the art will understand that, in the case where only a partial region on the cardiac coronary artery is scanned in one cardiac cycle in the method according to the present disclosure, the trajectory set may include only the trajectory region of the partial region (partial length region in the Z-axis direction) of the cardiac coronary artery.

Meanwhile, it is understood that the partial region of the tissue to be measured scanned in one cardiac cycle, which is indicated by the track region, may occupy the same volume as the partial region of the tissue to be measured, or may be different. For example, the area occupied in space by the partial region of the tissue to be measured scanned within one cardiac cycle, which is indicated by the trajectory region, may also be a cylindrical region, the volume of which may be larger or smaller than the volume of the partial region of the tissue to be measured, but the center of which coincides with the center of the partial region of the tissue to be measured.

In some embodiments, the trajectory of the tissue under test is characterized using a morphology of the tissue under test in a plurality of reconstructed images obtained after a plurality of reconstructions performed in each of a plurality of cardiac cycles. For example, in a two-dimensional reconstructed image, the edges of a cross-section of the tissue under examination characterize its position, and, for example, in a three-dimensional reconstructed image, the surface of the three-dimensional morphology of the tissue under examination characterizes its position.

It is to be understood that, in the embodiments of the present disclosure, image reconstruction is performed on a partial region of a tissue under test scanned in a cardiac cycle based on a plurality of phases in the cardiac cycle, and obtaining a plurality of reconstructed images corresponding to the plurality of phases is merely exemplary, and it will be understood by those skilled in the art that image reconstruction may also be performed on a partial region of a tissue under test scanned in a cardiac cycle based on a plurality of time points in the cardiac cycle, and a plurality of reconstructed images corresponding to the plurality of time points may also be obtained. For example, for one cardiac cycle having a time length of 70ms, one time point is obtained every 1ms, thereby obtaining 70 time points, and image reconstruction is performed for the 70 time points, respectively, thereby obtaining a plurality of reconstructed images corresponding to the 70 time points.

In some embodiments, as shown in fig. 6, the step S130 of obtaining the matching time point in each of the two adjacent cardiac cycles comprises:

step S610: obtaining a first track area in a track set corresponding to a first cardiac cycle of the two adjacent cardiac cycles and a second track area in a track set corresponding to a second cardiac cycle of the two adjacent cardiac cycles, wherein an area indicated by the first track area is matched with an area indicated by the second track area;

step S620: obtaining a first phase corresponding to the first trajectory region among the plurality of phases of the first cardiac cycle and a second phase corresponding to the second trajectory region among the plurality of phases of the second cardiac cycle; and

step S630: based on the first phase and the second phase, obtaining a matching time point in each of the two adjacent cardiac cycles, the matching time point in the first cardiac cycle corresponding to the first phase, and the matching time point in the second cardiac cycle corresponding to the second phase.

The partial regions of the measured tissue indicated by the two trajectory regions in the two trajectory sets corresponding to the two adjacent cardiac cycles match with each other in the space, that is, the partial regions of the measured tissue indicated by the two trajectory regions match in the space, so that the matching time points for obtaining the position matching of the measured tissue in the space in the two adjacent cardiac cycles can be obtained according to the periods corresponding to the two trajectory regions where the indicated partial regions of the measured tissue match in the space.

In some embodiments, matching the area indicated by the first track area with the area indicated by the second track area comprises: the area indicated by the first track area partially coincides with the area indicated by the second track area in the first direction.

The area indicated by the first track area and the area indicated by the second track area are partially overlapped in the first direction, so that the matching judgment of the area indicated by the first track area and the area indicated by the second track area is realized, the judgment process is simple, and the calculation amount is reduced.

It should be understood that the matching between the area indicated by the first track area and the area indicated by the second track area may be that the area indicated by the first track area and the area indicated by the second track area partially coincide in the first direction, or that the end of the area indicated by the first track area in the first direction may be connected to the head end of the area indicated by the second track area in the first direction, which is not limited herein. In some embodiments, the method comprises obtaining a same cross section of the scanned partial region of the measured tissue in each of two adjacent cardiac cycles, obtaining positions of a center of the same cross section at respective ones of the plurality of phases of each of the two adjacent cardiac cycles, and setting a plurality of positions of the center of the same cross section corresponding to the plurality of phases in the respective cardiac value cycles as a set of trajectories of the scanned partial region of the measured tissue in the cardiac cycle; then the step S130 of obtaining matching time points in each of the two adjacent cardiac cycles comprises: calculating a plurality of distances between each of the plurality of positions of the same cross-section in a first one of the two adjacent cardiac cycles and each of the plurality of positions of the same cross-section in a second one of the two adjacent cardiac cycles; obtaining two phase phases corresponding to two positions with the minimum distance, wherein the phase positioned in the first cardiac cycle is the first phase, and the phase positioned in the second cardiac cycle is the second phase; and obtaining matching time points within each of the two adjacent cardiac cycles based on the first and second facies.

In some embodiments, the trajectory of the tissue under test is characterized using a morphology of the tissue under test in a plurality of reconstructed images obtained after a plurality of reconstructions performed in each of a plurality of cardiac cycles; then the step S130 of obtaining matching time points in each of the two adjacent cardiac cycles comprises: obtaining two reconstructed images with consistent forms of the detected tissues in two adjacent cardiac cycles, wherein the two reconstructed images are respectively positioned in the two adjacent cardiac cycles; obtaining two phase phases corresponding to the two adjacent cardiac cycles based on the two reconstructed images; and obtaining a matching time point within each of the two adjacent cardiac cycles based on the two phase phases. The morphological coincidence of the tissue to be measured may be, for example, the edge coincidence of the tissue to be measured in the two-dimensional reconstructed image or the surface coincidence of the tissue to be measured in the three-dimensional reconstructed image.

For a cardiac scan, if a phase of the first cardiac cycle, for example, a phase at a relatively shallow motion of the heart muscle (e.g., 60% phase) is selected as the first phase, a second phase matching the first phase may be determined within ± 5% or ± 10% of the same phase in the second cardiac cycle. This reduces the amount of computation.

In some embodiments, as shown in fig. 7, the obtaining of the reconstructed image of the measured tissue from the first end to the second end in step S140 includes:

step S710: for each of the plurality of cardiac cycles, obtaining a partial region image at a matching time point within the cardiac cycle, the partial region image being obtained based on image reconstruction of a corresponding data set of the plurality of data sets corresponding to the matching time point; and

step S720: and obtaining the reconstruction image of the tested tissue based on a plurality of partial area images corresponding to the plurality of cardiac cycles.

After the matching time point in each cardiac cycle in a plurality of cardiac cycles is obtained, a partial region image of a partial region of the tested tissue scanned at the matching time point is obtained, and a tested tissue reconstruction image of the tested tissue is obtained based on the partial region image, so that the obtaining of a reconstruction image of the whole tested tissue is realized, and the tested tissue reconstruction image has no fault layers and is accurate.

In some embodiments, in step S120, for each of a plurality of cardiac cycles, a plurality of reconstructed images corresponding to the plurality of phases are obtained by performing a multi-phase reconstruction corresponding to the plurality of phases in the cardiac cycle based on the scanned partial region of the measured tissue in the cardiac cycle, and a set of trajectories of the partial region of the measured tissue scanned in the cardiac cycle is obtained based on the plurality of reconstructed images, and in step S140, a partial region image corresponding to the matching time point may be directly obtained from the plurality of images corresponding to the plurality of phases obtained in step S120.

According to another aspect of the embodiments of the present disclosure, there is also provided an image reconstruction apparatus. Referring to fig. 8, an image reconstruction apparatus 800 according to some embodiments of the present disclosure includes: a scan initiating unit 810 configured to initiate scanning of a tissue under test from a first end to a second end along a first direction over a first time comprising a plurality of cardiac cycles to obtain a plurality of data sets corresponding to the plurality of cardiac cycles, wherein a partial region of the tissue under test is scanned in each of the plurality of cardiac cycles and the partial regions of the tissue under test scanned in any two adjacent cardiac cycles partially overlap; a trajectory acquisition unit 820 configured to obtain, for each of the plurality of cardiac cycles, a set of trajectories within the cardiac cycle for the scanned partial region of the measured tissue within the cardiac cycle, the set of trajectories indicating positions in space of the scanned partial region of the measured tissue within the cardiac cycle at different time points within the cardiac cycle; a matching unit 830 configured to, for any two adjacent cardiac cycles in the multiple cardiac cycles, obtain a matching time point in each of the two adjacent cardiac cycles based on two trajectory sets corresponding to the two adjacent cardiac cycles, where positions of the tissue to be measured in space match at the matching time point in a first cardiac cycle and the matching time point in a second cardiac cycle of the two adjacent cardiac cycles; and an image reconstruction unit 840 configured to obtain a reconstructed image of the tissue to be measured from the first end to the second end of the tissue to be measured based on the matching time point corresponding to each of the plurality of cardiac cycles and the plurality of data sets.

In some embodiments, the trajectory acquisition unit 820 includes: a multi-phase image acquisition unit configured to obtain, for each of the plurality of cardiac cycles, a plurality of reconstructed images of a partial region of the tissue under test scanned in the cardiac cycle corresponding to a plurality of phase phases of the cardiac cycle based on corresponding ones of the plurality of data sets; and an acquisition subunit, configured to, for each of the plurality of cardiac cycles, obtain, based on the plurality of reconstructed images, a set of trajectories in the cardiac cycle for the partial region of the tissue under test scanned in the cardiac cycle.

In some embodiments, for each of the plurality of cardiac cycles, the set of trajectories within the cardiac cycle includes a plurality of trajectory regions corresponding to a plurality of phases within the cardiac cycle, each of the plurality of trajectory regions indicating a region in space occupied by the partial region of the measured tissue scanned within the cardiac cycle at the corresponding phase.

In some embodiments, the matching unit 830 includes: a matching subunit, configured to obtain a first track area in a track set corresponding to a first cardiac cycle of the two adjacent cardiac cycles and a second track area in a track set corresponding to a second cardiac cycle of the two adjacent cardiac cycles, where areas indicated by the first track area and the second track area match; a phase acquisition unit configured to acquire a first phase corresponding to the first trajectory region among a plurality of phases of the first cardiac cycle, and a second phase corresponding to the second trajectory region among a plurality of phases of the second cardiac cycle; and a time point obtaining unit configured to obtain a matching time point in each of the two adjacent cardiac cycles based on the first phase and the second phase, the matching time point in the first cardiac cycle corresponding to the first phase, and the matching time point in the second cardiac cycle corresponding to the second phase.

In some embodiments, matching the area indicated by the first track area with the area indicated by the second track area comprises: the area indicated by the first track area partially coincides with the area indicated by the second track area in the first direction.

In some embodiments, the image reconstruction unit 840 includes: an image acquisition unit configured to acquire, for each of the plurality of cardiac cycles, a partial region image at a matching time point within the cardiac cycle, the partial region image being acquired based on image reconstruction of a corresponding data set of the plurality of data sets corresponding to the matching time point; and the reconstruction subunit is configured to reconstruct images based on a plurality of partial areas corresponding to the plurality of cardiac cycles, and obtain reconstructed images of the detected tissues.

According to another aspect of the embodiments of the present disclosure, there is provided an electronic device including: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores a computer program which, when executed by the at least one processor, implements the image reconstruction method described above.

In some embodiments, the electronics may include means for determining magnetic resonance scan parameters. The electronic device may be a magnetic resonance scanning device.

According to another aspect of embodiments of the present disclosure, there is provided a non-transitory computer readable storage medium storing a computer program, wherein the computer program realizes the above method when executed by a processor.

According to another aspect of embodiments of the present disclosure, there is provided a computer program product comprising a computer program, wherein the computer program realizes the above method when executed by a processor.

Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuitry, Field Programmable Gate Arrays (FPGAs), Application Specific Integrated Circuits (ASICs), Application Specific Standard Products (ASSPs), system on a chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs that are executable and/or interpretable on a programmable system including at least one programmable processor, which may be special or general purpose, receiving data and instructions from, and transmitting data and instructions to, a storage system, at least one input device, and at least one output device.

Program code for implementing the methods of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program codes, when executed by the processor or controller, cause the functions/operations specified in the flowchart and/or block diagram to be performed. The program code may execute entirely on the machine, partly on the machine, as a stand-alone software package partly on the machine and partly on a remote machine or entirely on the remote machine or server.

In the context of this disclosure, a computer-readable medium or machine-readable medium may be a tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. The machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

To provide for interaction with a user, the systems and techniques described here can be implemented on a computer having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and a pointing device (e.g., a mouse or a trackball) by which a user can provide input to the computer. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic, speech, or tactile input.

The systems and techniques described here can be implemented in a computing system that includes a back-end component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such back-end, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), Wide Area Networks (WANs), and the Internet.

It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present disclosure may be performed in parallel, sequentially or in different orders, and are not limited herein as long as the desired results of the technical solutions disclosed in the present disclosure can be achieved.

Although embodiments or examples of the present disclosure have been described with reference to the accompanying drawings, it is to be understood that the above-described methods, systems and apparatus are merely exemplary embodiments or examples and that the scope of the present invention is not limited by these embodiments or examples, but only by the claims as issued and their equivalents. Various elements in the embodiments or examples may be omitted or may be replaced with equivalents thereof. Further, the steps may be performed in an order different from that described in the present disclosure. Further, various elements in the embodiments or examples may be combined in various ways. It is important that as technology evolves, many of the elements described herein may be replaced with equivalent elements that appear after the present disclosure.

Claims (15)

1. An image reconstruction method, comprising:

initiating a scan of a tissue under test in a first direction from a first end to a second end over a first time comprising a plurality of cardiac cycles to obtain a plurality of data sets corresponding to the plurality of cardiac cycles, wherein a partial region of the tissue under test is scanned in each of the plurality of cardiac cycles and the scanned partial regions of the tissue under test in any two adjacent cardiac cycles partially overlap in the first direction;

for each of the plurality of cardiac cycles, obtaining a set of trajectories in the cardiac cycle for the scanned partial region of the measured tissue in the cardiac cycle based on a corresponding data set in the plurality of data sets, the set of trajectories indicating positions in space of the scanned partial region of the measured tissue in the cardiac cycle at different points in time in the cardiac cycle;

for any two adjacent cardiac cycles in the multiple cardiac cycles, obtaining a matching time point in each of the two adjacent cardiac cycles based on two track sets corresponding to the two adjacent cardiac cycles, wherein the positions of the measured tissue in space are matched at the matching time point in the first cardiac cycle and the matching time point in the second cardiac cycle in the two adjacent cardiac cycles; and

obtaining a reconstructed image of the tissue under test from the first end to the second end of the tissue under test based on the matched time points in each of the plurality of cardiac cycles.

2. The method of claim 1, wherein the obtaining a set of trajectories in the cardiac cycle for the scanned partial region of the tissue under test in the cardiac cycle comprises:

obtaining a plurality of reconstructed images of the partial region of the tissue under test scanned in the cardiac cycle corresponding to a plurality of phases of the cardiac cycle based on corresponding data sets in the plurality of data sets; and

based on the plurality of reconstructed images, a track set of the partial area of the tested tissue scanned in the cardiac cycle is obtained.

3. The method of claim 2, wherein, for each of the plurality of cardiac cycles, the set of trajectories within the cardiac cycle includes a plurality of trajectory regions corresponding to a plurality of phases within the cardiac cycle, each of the plurality of trajectory regions indicating a region in space occupied by the partial region of the measured tissue scanned within the cardiac cycle at the corresponding phase.

4. The method of claim 3, wherein said obtaining matching time points within each of the two adjacent cardiac cycles comprises:

obtaining a first track area in a track set corresponding to a first cardiac cycle of the two adjacent cardiac cycles and a second track area in a track set corresponding to a second cardiac cycle of the two adjacent cardiac cycles, wherein an area indicated by the first track area is matched with an area indicated by the second track area;

obtaining a first phase corresponding to the first trajectory region among the plurality of phases of the first cardiac cycle and a second phase corresponding to the second trajectory region among the plurality of phases of the second cardiac cycle; and

based on the first phase and the second phase, obtaining a matching time point in each of the two adjacent cardiac cycles, the matching time point in the first cardiac cycle corresponding to the first phase, and the matching time point in the second cardiac cycle corresponding to the second phase.

5. The method of claim 4, wherein the matching of the area indicated by the first track area with the area indicated by the second track area comprises: the area indicated by the first track area partially coincides with the area indicated by the second track area in the first direction.

6. The method of any one of claims 1-5, wherein the obtaining a reconstructed image of the tissue under test from the first end to the second end comprises:

for each of the plurality of cardiac cycles, obtaining a partial region image at a matching time point within the cardiac cycle, the partial region image being obtained based on image reconstruction of a corresponding data set of the plurality of data sets corresponding to the matching time point; and

and obtaining the reconstruction image of the tested tissue based on a plurality of partial area images corresponding to the plurality of cardiac cycles.

7. An image reconstruction apparatus comprising:

a scan initiating unit configured to initiate scanning of a tissue under test from a first end to a second end along a first direction over a first time comprising a plurality of cardiac cycles to obtain a plurality of data sets corresponding to the plurality of cardiac cycles, wherein a partial region of the tissue under test is scanned in each of the plurality of cardiac cycles and the partial regions of the tissue under test scanned in any two adjacent cardiac cycles partially overlap;

a trajectory acquisition unit configured to obtain, for each of the plurality of cardiac cycles, a set of trajectories within the cardiac cycle for the scanned partial region of the measured tissue within the cardiac cycle, the set of trajectories indicating positions in space of the scanned partial region of the measured tissue within the cardiac cycle at different points in time within the cardiac cycle;

a matching unit configured to, for any two adjacent cardiac cycles in the plurality of cardiac cycles, obtain a matching time point in each of the two adjacent cardiac cycles based on two trajectory sets corresponding to the two adjacent cardiac cycles, where positions of the tissue to be measured in space match at the matching time point in a first cardiac cycle and the matching time point in a second cardiac cycle of the two adjacent cardiac cycles; and

an image reconstruction unit configured to obtain a reconstructed image of the tissue to be measured from the first end to the second end of the tissue to be measured based on the matching time point corresponding to each of the plurality of cardiac cycles and the plurality of data sets.

8. The apparatus of claim 7, wherein the trajectory acquisition unit comprises:

a multi-phase image acquisition unit configured to obtain, for each of the plurality of cardiac cycles, a plurality of reconstructed images of a partial region of the tissue under test scanned in the cardiac cycle corresponding to a plurality of phase phases of the cardiac cycle based on corresponding ones of the plurality of data sets; and

an acquisition subunit, configured to, for each of the plurality of cardiac cycles, obtain, based on the plurality of reconstructed images, a set of trajectories in the cardiac cycle for the partial region of the tissue under test scanned in the cardiac cycle.

9. The apparatus of claim 8, wherein, for each of the plurality of cardiac cycles, the set of trajectories within the cardiac cycle includes a plurality of trajectory regions corresponding to a plurality of phases within the cardiac cycle, each of the plurality of trajectory regions indicating a region in space occupied by the partial region of the measured tissue scanned within the cardiac cycle at the corresponding phase.

10. The apparatus of claim 8, wherein the matching unit comprises:

a matching subunit configured to obtain a first track area in a track set corresponding to a first cardiac cycle of the two adjacent cardiac cycles and a second track area in a track set corresponding to a second cardiac cycle of the two adjacent cardiac cycles, an area indicated by the first track area matching an area indicated by the second track area;

a phase acquisition unit configured to acquire a first phase corresponding to the first trajectory region among a plurality of phases of the first cardiac cycle, and a second phase corresponding to the second trajectory region among a plurality of phases of the second cardiac cycle; and

a time point obtaining unit configured to obtain a matching time point in each of the two adjacent cardiac cycles based on the first phase and the second phase, the matching time point in the first cardiac cycle corresponding to the first phase, and the matching time point in the second cardiac cycle corresponding to the second phase.

11. The apparatus of claim 10, wherein the matching of the area indicated by the first track area with the area indicated by the second track area comprises: the area indicated by the first track area partially coincides with the area indicated by the second track area in the first direction.

12. The apparatus of any one of claims 7-11, wherein the image reconstruction unit comprises:

an image acquisition unit configured to acquire, for each of the plurality of cardiac cycles, a partial region image at a matching time point within the cardiac cycle, the partial region image being acquired based on image reconstruction of a corresponding data set of the plurality of data sets corresponding to the matching time point; and

and the reconstruction subunit is configured to reconstruct an image based on a plurality of partial regions corresponding to the plurality of cardiac cycles, and obtain a reconstructed image of the detected tissue.

13. An electronic device, comprising:

at least one processor; and

a memory communicatively coupled to the at least one processor; wherein

The memory stores a computer program which, when executed by the at least one processor, implements the method according to any one of claims 1-6.

14. A non-transitory computer readable storage medium storing a computer program, wherein the computer program, when executed by a processor, implements the method of any of claims 1-6.

15. A computer program product comprising a computer program, wherein the computer program realizes the method according to any of claims 1-6 when executed by a processor.

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