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Image reconstruction method and device by oblique spiral scanning

A technology of helical scanning and image reconstruction, applied in the field of medical images, which can solve problems such as the appearance of artifacts, affecting image quality, and destroying original data.

Active Publication Date: 2014-01-01
NEUSOFT MEDICAL SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Due to the geometry of oblique scanning, the trajectory of the X-ray source relative to the object is an oblique helical structure. Using the conventional helical reconstruction method for imaging will lead to the appearance of artifacts
Therefore, it is usually necessary to correct the data before image reconstruction, such as: interpolation processing or smoothing processing, but this correction processing will cause a certain degree of damage to the original data and affect the quality of the final reconstructed image

Method used

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  • Image reconstruction method and device by oblique spiral scanning
  • Image reconstruction method and device by oblique spiral scanning
  • Image reconstruction method and device by oblique spiral scanning

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Experimental program
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Effect test

Embodiment 1

[0077] See figure 1 , Which is a flowchart of an image reconstruction method of oblique spiral scanning disclosed in the first embodiment of the application, and the method includes the following steps:

[0078] Step 101: Obtain data obtained by oblique spiral scanning;

[0079] Preferably, the data obtained by the oblique spiral scanning is cone beam data or wedge beam data. The cone-beam data is the corrected data obtained by the CT equipment through oblique helical scanning; the wedge-beam data refers to the corrected data obtained by the CT equipment through the oblique helical scan, and in order to facilitate back projection, a well-known parallel beam is used The data obtained after the reorganization method (or wedge beam reorganization). After reorganization, the data at each angle is composed of a series of ray clusters. Each cluster contains M rays (M is the number of detector layers). The projections of these M rays in the XY plane coincide with each other. The project...

Embodiment 2

[0093] In order to more clearly explain the image reconstruction method of oblique spiral scanning provided by the present invention, the second embodiment is taken as an example below to specifically describe the entire image reconstruction method. The method includes:

[0094] Step 201: Obtain data obtained by oblique spiral scanning;

[0095] Step 202: Calculate the corresponding ray channel parameter and the number of layers for each pixel position according to the mathematical relationship between the ray of the oblique spiral scan, the image and the detector.

[0096] Preferably, step 202 includes:

[0097] Establish the ray source parameter mathematical equation, the tilt detector parameter mathematical equation and the target tilt image parameter mathematical equation in the tilt scanning system;

[0098] Calculate the ray equation from the ray source to a certain pixel position by using the parameter mathematical equation of the target image and the ray source parameter mathema...

Embodiment 3

[0183] Corresponding to the oblique helical scanning image reconstruction method in the first embodiment, the embodiment of the present application provides an oblique helical scanning image reconstruction device. See figure 2 , Which is a structural diagram of an image reconstruction device for oblique helical scanning disclosed in the third embodiment of the application. The device includes: an acquisition unit 201, a calculation unit 202, and a reconstruction unit 203. The internal structure and connection relationship of the device will be further introduced below in conjunction with the working principle of the device. The device specifically includes:

[0184] The obtaining unit 201 is configured to obtain data obtained by oblique spiral scanning;

[0185] The calculation unit 202 is configured to calculate the corresponding ray channel parameter and the number of layers at each pixel position according to the geometric relationship of the intersection point between the ray...

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Abstract

An embodiment of the method discloses an image reconstruction method and device by oblique spiral scanning. The method specifically includes acquiring data obtained by oblique spiral scanning; according to geometrical relationship of intersection points between rays of oblique spiral scanning and a detector, calculating a channel angle and number of layers the ray corresponding to each pixel position; according to a three-dimensional spiral back projection method, performing back projection image reconstruction according to the acquired data as well as channel parameters and the number of layers of the ray corresponding to each pixel position. By the method and device, raw data are not required to be corrected and processed, data accuracy can be guaranteed, artifacts can be prevented for appearance, and accuracy of reconstructed images is guaranteed.

Description

Technical field [0001] The present invention relates to the technical field of medical images, in particular to an image reconstruction method and device of oblique spiral scanning. Background technique [0002] X-ray computed tomography (Computed Tomography, CT) is a technology that uses computer technology to reconstruct the cross-section of the measured object to obtain tomographic images. This technology utilizes when the ray penetrates the measured object, the absorption and transmittance of each part of the measured object are different. The transmitted rays are collected by a computer and the image is reconstructed through a certain algorithm. [0003] The existing CT equipment has a variety of scanning methods. With the gradual increase of the equipment's rotation speed, spatial resolution, detector width and the higher and higher requirements for scanning radiation dose, the inclined spiral scanning method can effectively reduce X The radiation damages certain special par...

Claims

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Application Information

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IPC IPC(8): A61B6/03
CPCG06T11/006G06T2211/421G06T11/008
Inventor 楼珊珊赵江魏
Owner NEUSOFT MEDICAL SYST CO LTD
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