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CT machine, scanning method and image reconstruction method

A technology of tomography and computer, applied in image data processing, graphic image conversion, computerized tomography scanner, etc., can solve problems such as aliasing artifacts, achieve high-quality three-dimensional imaging, good isotropic resolution effect, eliminate The effect of Z-direction aliasing artifacts

Active Publication Date: 2018-07-17
沈阳晟诺科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Embodiments of the present invention provide a CT machine, a scanning method, and an image reconstruction method to solve the technical problem of aliasing artifacts in existing CT scanning systems

Method used

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  • CT machine, scanning method and image reconstruction method
  • CT machine, scanning method and image reconstruction method
  • CT machine, scanning method and image reconstruction method

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Embodiment 1

[0077] Such as Figure 1-2 As shown, a computer tomography apparatus provided by an embodiment of the present invention includes a fixed frame 1, a rotating frame 2, a light source generating device 3, a signal detection device 4, and a scanning target supporting device 5: the rotating frame 2 can surround XY A certain fixed point on the plane rotates; the scanned target supporting device 5 is fixed along the Z direction to meet the tomographic trajectory, and the XYZ coordinate system meets the definition of the right-handed system; the light source generating device 3 is installed on the rotating frame 2, It can output the scanning light of the cone beam, and quickly switch the focus position along the Z direction during adjacent sampling periods, while the center position of the light source continuously moves along the Z direction; the signal detection device 4 is installed on the rotating frame 2, and The position of the light source generating device 3 is relatively, and ...

Embodiment 2

[0084] Such as image 3 As shown, the embodiment of the present invention also provides a scanning control method using any of the above-mentioned computed tomography apparatus, wherein the above-mentioned computed tomography apparatus will not be described in detail. The scanning control method may include the following steps:

[0085] S101: While the light source generating device 3 and the signal detecting device 4 are rotating and scanning in the XY plane, the scanned target supporting device 5 is fixed in the Z direction to meet the tomographic trajectory. Trigger sampling in equal-angle mode, the total number of projected samples is an even number, defined as N, and the range of acquisition can be less than one circle, exactly one circle, or more than one circle;

[0086] S102: When the tomographic scan is started, the position of the light source generating device's focus on the anode target surface is continuously and rapidly switched, and the center position of the light s...

Embodiment 3

[0104] Such as image 3 As shown, the embodiment of the present invention also provides a method for image reconstruction based on the data obtained by any of the above-mentioned scan control methods. The CT machine adopts the CT machine described in Embodiment 1, and the scanning method is as in the embodiment. 2 said, not repeat them here. The method of image reconstruction for the data obtained by the scanning control method includes the following steps:

[0105] S201: Perform necessary preprocessing on the scanned data;

[0106] S202: rearrange the data pre-processed in step S201;

[0107] S203: filtering and weighting the data rearranged in step S202;

[0108] S204: Back-project the filtered and weighted data in step S203;

[0109] S205: Perform post-processing on the back-projected data in step S204 to obtain an image that can be used for diagnosis.

[0110] In particular, the step S202 includes:

[0111] S2021: At different projection angles, the radius of rotation and channel an...

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Abstract

According to the embodiment, the invention relates to a computed tomography device, a scanning method and an image reconstruction method. The computed tomography device comprises a fixed frame (1), arotary frame (2), a light source generating device (3), a signal detection device (4) and a scanned object supporting device (5), wherein the rotary frame (2) can rotate around some fixed point in anX-Y plane, and the scanned object supporting device can be kept immobile in an Z direction; the light source generating device (3) is arranged on the rotary frame (2) and is opposite to the position of the light source generating device, and the signal detection device, in a rotating process, is free from change in position relative to the light source generating device, so that a cone beam lightsource can be received by an area array of the signal detection device; and the signal detection device is of an area-array structure adaptive to collection of the cone beam.

Description

Technical field [0001] The present invention relates to the technical field of medical computer tomography, in particular to a scanning mode and a corresponding image reconstruction method of a CT machine that generates high-resolution images, and a CT machine adopting the scanning mode and reconstruction method. Background technique [0002] CT (Computed Tomography), also known as computer tomography equipment. With the development of technology, CT machine has gradually developed from the traditional slice imaging method, which is imaging in the rotating plane (here called XY plane), to the volume imaging method, which is continuous in the direction of the rotation axis (here called Z direction). Imaging. This is mainly due to the maturity of the volumetric continuous scanning mode, area array detectors and cone beam reconstruction methods. [0003] With the wide application of volumetric (three-dimensional) imaging methods (MPR, VR, etc.) in clinical diagnosis, CT machines hav...

Claims

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Application Information

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IPC IPC(8): A61B6/03G06T3/40G06T3/60
CPCA61B6/032A61B6/4021A61B6/42A61B6/52G06T3/4023G06T3/608
Inventor 任毅
Owner 沈阳晟诺科技有限公司
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