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Method and device for removing motion blur from projected image of CBCT (Cone Beam Computerized Tomography) system

A technology of projected image and motion blur, applied in the field of image processing, can solve the problems of image motion blur and image quality that does not meet clinical needs, and achieve the effect of improving spatial resolution and image quality

Active Publication Date: 2017-05-31
SHANGHAI UNITED IMAGING HEALTHCARE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] To sum up, the existing schemes to obtain high scanning speed are at the expense of image quality and calculation time. The images obtained by the CBCT system with high scanning speed in continuous scanning mode have motion blur, and the quality of the image does not meet the actual clinical needs

Method used

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  • Method and device for removing motion blur from projected image of CBCT (Cone Beam Computerized Tomography) system
  • Method and device for removing motion blur from projected image of CBCT (Cone Beam Computerized Tomography) system
  • Method and device for removing motion blur from projected image of CBCT (Cone Beam Computerized Tomography) system

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Experimental program
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Embodiment 1

[0058] This embodiment provides a method for removing motion blur in a projected image of a CBCT system. In this embodiment, the frame of the CBCT system is C-shaped and the imaging unit is a detector for illustration, but the technical solution of the present invention is not limited thereto. The CBCT system in this embodiment includes a C-shaped frame, an X-ray source and a detector. The frame can rotate around the central axis of the frame. The X-ray source and the detector are respectively arranged on two opposite sides of the frame. end. During the working process of the CBCT system, the subject or part to be examined is located between the X-ray source and the detector, and the rays emitted by the X-ray source are projected on the detector to generate a projection image.

[0059] figure 2 is a schematic diagram of detector-induced motion blur, such as figure 2 As shown, during the high-speed rotation of the C-shaped frame, the X-ray source and the detector cannot ma...

Embodiment 2

[0087] The difference between this embodiment and Embodiment 1 is that in this embodiment, in addition to the motion blur caused by the motion of the detector, the motion blur caused by the focal spot is also considered, that is, the detector and the focal spot are removed in this embodiment Motion blur caused by two aspects.

[0088] Such as Figure 7 as shown, Figure 7 It is a flowchart of a method for removing motion blur in a projection image of a CBCT system according to Embodiment 2 of the present invention, and the method includes:

[0089] Step 101, determine the area N occupied by voxels in the projection image, the size of the area N is related to the angular velocity W of the gantry movement in the CBCT system, the exposure time T of the CBCT system, the pixel size L of the imaging unit, And the distance D from the center of rotation of the gantry to the plane of the imaging unit.

[0090] Step 102, with not less than The first projection image is collected at...

Embodiment 3

[0100] Such as Figure 10 as shown, Figure 10 It is a structural block diagram of the device for removing motion blur in the projection image of the CBCT system according to Embodiment 3 of the present invention, as Figure 10 As shown, the device for removing motion blur in the projection image of the CBCT system includes:

[0101] The area determination module is used to determine the area N occupied by voxels in the projection image, and the size of the area N is related to the angular velocity W of the gantry movement in the CBCT system, the exposure time T of the CBCT system, and the pixels of the imaging unit Dimension L, and the distance D from the center of rotation of the frame to the plane of the imaging unit;

[0102] Image acquisition module, used for not less than The first projected image is collected at a frame rate, wherein INT(N) is rounded to the region N;

[0103] The image synthesis module is used to synthesize each INT (FR×T) first projection image t...

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Abstract

The invention discloses a method and a device for removing motion blur from a projected image of a CBCT (Cone Beam Computerized Tomography) system and the CBCT system. The method for removing the motion blur from the projected image of the CBCT system comprises the steps: determining an area N occupied by tissue in the projected image, wherein the size of the area N is related to an angular speed W of motion of a rack of the CBCT system, exposure time T of the CBCT system, a pixel size L of an imaging unit and a distance D from the center of rotation of the rack to a plane of the imaging unit; acquiring a first projected image at a frame rate which is not smaller than a formula shown in the description, synthesizing every INT (FR*T) first projected images so as to generate the motion blur removed projected image. By adopting the method disclosed by the invention, the motion blur caused by detector motion is removed from the synthesized projected image, and the spatial resolution and signal-to-noise ratio of the projected image can be remarkably increased.

Description

technical field [0001] The invention relates to image processing, in particular to a method and device for removing motion blur in projected images of a CBCT system and a CBCT system. Background technique [0002] Cone beam computed tomography reconstruction (CBCT) is a technology that uses cone beam projection computer to reconstruct tomographic images. The data set after multiple exposures of the target body is used to reconstruct the three-dimensional volume data in the computer. Compared with the traditional spiral CT, the difference between CBCT and the traditional spiral CT is mainly in the detector. The traditional spiral CT uses a linear array sensor while the CBCT uses an area array sensor. Two-dimensional slice data is reconstructed from three-dimensional data, and three-dimensional volume data is established from each two-dimensional slice data, while CBCT directly uses two-dimensional projection data to reconstruct three-dimensional volume data, so CBCT significa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06T7/00
CPCG06T7/0012G06T2207/10081G06T5/73
Inventor 徐璐王思睿陈鸣之
Owner SHANGHAI UNITED IMAGING HEALTHCARE
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