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Image Orthographic Projection Method and Device

An orthographic projection and image technology, applied in the field of image orthographic projection methods and devices, can solve the time-consuming problems of image correction and iterative reconstruction process, and achieve the effects of eliminating redundant calculations, reducing the amount of calculations, and improving efficiency

Active Publication Date: 2022-06-28
NEUSOFT MEDICAL SYST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, this application provides an image forward projection method and device to solve the problem of time-consuming image correction and iterative reconstruction process in the existing implementation

Method used

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  • Image Orthographic Projection Method and Device
  • Image Orthographic Projection Method and Device
  • Image Orthographic Projection Method and Device

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Embodiment Construction

[0023] Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. Where the following description refers to the drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the illustrative examples below are not intended to represent all implementations consistent with this application. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present application as recited in the appended claims.

[0024] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit the application. As used in this application and the appended claims, the singular forms "a," "the," and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. It will also be understood that the term "and / or" as...

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Abstract

The application provides a method and device for orthographic projection of an image. The method includes: dividing the image into concentric rings with the image center as the center, determining the coordinates and pixel values ​​of sampling points on each concentric ring; obtaining , the coordinates and pixel values ​​of the intersection point of each ray and each concentric ring; at each rotation angle, for each ray, use the pixel value of the intersection point on the ray and the intercept corresponding to the concentric ring where the intersection point is located to determine The projection value of this ray. Since the center of the image coincides with the rotation center of the ray source, the intercept of the same ray passing through the same concentric ring at different rotation angles is the same, and the intercept can be calculated only once, which can eliminate repeated redundant calculations of the distance and improve the image Correction and iterative reconstruction efficiency; and because of the small amount of calculation in this case, it can also be extended to the image correction and iterative reconstruction process using multiple ray source modes.

Description

technical field [0001] The present application relates to the technical field of image processing, and in particular, to a method and apparatus for orthographic projection of an image. Background technique [0002] The orthographic projection process is a key link in the process of CT (Computed Tomography, computed tomography) image correction and iterative reconstruction. Usually CT equipment includes a ray source and a detector. After the ray emitted by the ray source passes through the object to be measured, it can be received by the detector. During image acquisition, the ray source and the detector take the rotation center as the center of the circle, and every preset angle Rotate at intervals until the end of a full rotation. During this rotation, a CT image of the object to be measured is acquired. [0003] In the related art, the orthographic projection process is to calculate the product of the distance between the points with the same pixel value and the pixel val...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T11/00
CPCG06T11/003
Inventor 王洪波楼珊珊刘长坤逄岭
Owner NEUSOFT MEDICAL SYST CO LTD
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