CN-121236154-B - Body position information determining method and device

CN121236154BCN 121236154 BCN121236154 BCN 121236154BCN-121236154-B

Abstract

The invention provides a body position information determining method and device. The method is applied to the field of medical image data processing. The method comprises the steps of obtaining three-dimensional coordinate data of spatial position labels in a plurality of tomographic image slices of a target object under the same image sequence, determining coordinate values with changes based on the three-dimensional coordinate data to obtain target coordinate values, calculating a change trend on a corresponding coordinate axis based on the target coordinate values to obtain a change trend of the target coordinate axis, determining a direction of the corresponding coordinate axis based on the change trend of the coordinate axis to obtain a target coordinate axis direction, constructing a three-dimensional coordinate system based on the target coordinate axis direction to obtain a three-dimensional coordinate system of imaging equipment, matching the three-dimensional coordinate system of the imaging equipment with a standard body position three-dimensional coordinate system library, and obtaining body position information of the target object according to the standard body position three-dimensional coordinate system with successful matching. The invention realizes rapid and accurate acquisition of the real body position information of the target object.

Inventors

ZHANG HAOREN
CHEN XIANGQIAN
GAO CHANG
XIE XIAOFEI

Assignees

真健康(广东横琴)医疗科技有限公司

Dates

Publication Date: 20260512
Application Date: 20250916

Claims (9)

1. A body position information determination method, characterized by comprising: aiming at a plurality of tomographic image slices of a target object under the same image sequence, acquiring three-dimensional coordinate data of a spatial position label in the tomographic image slices, wherein the three-dimensional coordinate data is a spatial position coordinate value of a first pixel point at the upper left corner in the tomographic image slices; determining coordinate values with changes based on the three-dimensional coordinate data to obtain target coordinate values; calculating the change trend on the corresponding coordinate axis based on the target coordinate value to obtain the change trend of the target coordinate axis; determining the direction of the corresponding coordinate axis based on the change trend of the target coordinate axis to obtain the direction of the target coordinate axis; constructing a three-dimensional coordinate system based on the target coordinate axis direction to obtain a three-dimensional coordinate system of the imaging equipment; and matching the imaging equipment three-dimensional coordinate system with a standard body position three-dimensional coordinate system library, and obtaining the body position information of the target object according to the successfully matched standard body position three-dimensional coordinate system.
2. The method of claim 1, wherein the plurality of tomogram slices are slices of a same scan plane, and wherein the coordinate values of the first pixel point in the upper left corner of all tomogram slices at the scan plane are kept constant.
3. The method according to claim 1, wherein the calculating the trend of the change in the corresponding coordinate axis based on the target coordinate value to obtain the trend of the change in the target coordinate axis includes: Extracting a first tomographic image slice and a last tomographic image slice according to the serial numbers of the tomographic image slices corresponding to the target coordinate values; performing difference value calculation based on target coordinate values corresponding to the first tomographic image slice and the last tomographic image slice to obtain a difference value; and determining the change trend on the corresponding coordinate axis based on the positive and negative of the difference value to obtain the change trend of the target coordinate axis.
4. The method according to claim 3, wherein determining the direction of the corresponding coordinate axis based on the trend of the target coordinate axis change, to obtain the target coordinate axis direction, includes: Judging whether the change trend of the target coordinate axis is increased along with the increase of the serial number based on the serial number of the tomogram slice; if the change trend of the target coordinate axis is increased along with the increase of the serial number, judging that the direction of the target coordinate axis is positive; And if the change trend of the target coordinate axis is reduced along with the increase of the serial number, judging that the direction of the target coordinate axis is negative.
5. The method according to claim 1, wherein constructing a three-dimensional coordinate system based on the target coordinate axis direction, to obtain the imaging device three-dimensional coordinate system, comprises: And constructing a three-dimensional coordinate system meeting the rule of the right-hand coordinate system based on the direction of the target coordinate axis to obtain the three-dimensional coordinate system of the imaging equipment.
6. The method of claim 1, wherein the standard body position three-dimensional coordinate system library comprises a three-dimensional coordinate system constructed based on standard body positions, wherein the standard body positions comprise at least one of a head advanced supine position, a head advanced prone position, a foot advanced supine position, and a foot advanced prone position.
7. The method according to claim 1, wherein the matching the imaging device three-dimensional coordinate system with a standard body position three-dimensional coordinate system library, and obtaining the body position information of the target object according to the standard body position three-dimensional coordinate system that is successfully matched, includes: Judging whether the direction of the target coordinate axis is consistent with the direction of the corresponding coordinate axis in the three-dimensional coordinate system of each standard body position; if the direction of the target coordinate axis is consistent with the direction of the corresponding coordinate axis in any standard body position three-dimensional coordinate system, judging whether the directions of the two remaining coordinate axes are consistent with the directions of the two remaining coordinate axes in the standard body position three-dimensional coordinate system; if the directions of the remaining two coordinate axes are consistent with those of the remaining two coordinate axes in the standard body position three-dimensional coordinate system, judging that the imaging equipment three-dimensional coordinate system is successfully matched with the standard body position three-dimensional coordinate system, and determining body position information of the standard body position three-dimensional coordinate system which is successfully matched as body position information of the target object.
8. The method according to claim 7, wherein if the direction of the target coordinate axis is inconsistent with the direction of the corresponding coordinate axis in any standard body position three-dimensional coordinate system, continuing to determine whether the direction of the target coordinate axis is consistent with the direction of the corresponding coordinate axis in the next standard body position three-dimensional coordinate system, and so on until the imaging device three-dimensional coordinate system is successfully matched with the standard body position three-dimensional coordinate system, and determining the body position information of the standard body position three-dimensional coordinate system successfully matched as the body position information of the target object.
9. A body position information determining apparatus comprising a processor and a memory coupled to the processor, wherein the memory stores instructions executable by the processor to cause the processor to perform the body position information determining method according to any one of claims 1-8.

Description

Body position information determining method and device Technical Field The invention relates to the field of medical image data processing, in particular to a body position information determining method and device. Background The body position information of DICOM (DIGITAL IMAGING AND Communications IN MEDICINE, digital imaging and communication standard) images has critical significance for clinical diagnosis and treatment and engineering treatment. Accurate position information is a core basis for judging the space orientation of a focus during film reading, and position confusion can lead to focus positioning deviation, thereby affecting operation positioning decision and delaying treatment process. In standard DICOM data, body position information is typically recorded normalized by a Tag (Tag). Wherein the core tag (0018,5100) directly associated with the Position is described as "Patient Position". The tag stores a standardized body position identification (e.g., a predefined body position classification code) for uniformly characterizing the body position state of the subject at the time of scanning. However, in the prior art, the operation of doctors easily causes the error or neglect of DICOM body position information, and influences the focus diagnosis and treatment positioning accuracy. The existing solution relies on naked eyes to observe an anatomical structure (special medical knowledge is needed and subjectivity is strong) or three-dimensional reconstruction is compared with a standard model (algorithm is complex and calculation is time-consuming), and the problems of high special threshold, large realization difficulty, low processing efficiency and the like exist, so that reliable body position information is difficult to acquire quickly and accurately. Disclosure of Invention In view of this, an aspect of the present invention provides a body position information determining method, including: aiming at a plurality of tomographic image slices of a target object under the same image sequence, acquiring three-dimensional coordinate data of a spatial position label in the tomographic image slices, wherein the three-dimensional coordinate data is a spatial position coordinate value of a first pixel point at the upper left corner in the tomographic image slices; determining coordinate values with changes based on the three-dimensional coordinate data to obtain target coordinate values; calculating the change trend on the corresponding coordinate axis based on the target coordinate value to obtain the change trend of the target coordinate axis; Determining the direction of the corresponding coordinate axis based on the coordinate axis variation trend to obtain the direction of the target coordinate axis; constructing a three-dimensional coordinate system based on the target coordinate axis direction to obtain a three-dimensional coordinate system of the imaging equipment; and matching the imaging equipment three-dimensional coordinate system with a standard body position three-dimensional coordinate system library, and obtaining the body position information of the target object according to the successfully matched standard body position three-dimensional coordinate system. Optionally, the plurality of tomographic slices are slices of a same scan plane, and coordinate values of a first pixel point at an upper left corner in all tomographic slices at the scan plane are kept constant. Optionally, the calculating the change trend on the corresponding coordinate axis based on the target coordinate value to obtain the change trend of the target coordinate axis includes: Extracting a first tomographic image slice and a last tomographic image slice according to the serial numbers of the tomographic image slices corresponding to the target coordinate values; performing difference value calculation based on target coordinate values corresponding to the first tomographic image slice and the last tomographic image slice to obtain a difference value; and determining the change trend on the corresponding coordinate axis based on the positive and negative of the difference value to obtain the change trend of the target coordinate axis. Optionally, the determining the direction of the corresponding coordinate axis based on the coordinate axis variation trend to obtain the target coordinate axis direction includes: Judging whether the coordinate axis variation trend is increased along with the increase of the serial number based on the serial number of the tomogram slice; if the coordinate axis change trend is increased along with the increase of the serial number, judging that the target coordinate axis direction is positive; and if the coordinate axis change trend is reduced along with the increase of the serial number, judging that the target coordinate axis direction is negative. Optionally, the constructing a three-dimensional coordinate system based on the target coordinate axis direction to obtain the