Method for correcting effect of bed board and positioning auxiliary device on image quality

An auxiliary device, a technology of image quality, applied in the direction of computed tomography, echo tomography, etc., to achieve the effect of improving quality

Inactive Publication Date: 2010-06-09
戴建荣 +1
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Problems solved by technology

However, these materials cannot be completely transparent to X-rays

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  • Method for correcting effect of bed board and positioning auxiliary device on image quality
  • Method for correcting effect of bed board and positioning auxiliary device on image quality
  • Method for correcting effect of bed board and positioning auxiliary device on image quality

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Embodiment Construction

[0034] The specific embodiment of the present invention will be described below by taking cone beam CT imaging of a head and neck patient and an image quality inspection phantom as an example. For head and neck patients, apply the present invention to carry out the following steps:

[0035] (1) Use 10 different exposures (800, 640, 500, 400, 320, 250, 200, 160, 120, 100, unit mA ms) to repeatedly scan the air to obtain the gray value g of the projected image and receive it with the detection board The functional relationship g=f(I) of the X-ray intensity I, the experiment shows that the energy response characteristic is a linear function g=k·I+b;

[0036] (2) Set scan parameters: voltage 100kVp, current 32mA / F, exposure time 10mS / F, using F0 filter and S10 collimator, using positioning auxiliary device to position the patient, and collecting the patient’s cone beam CT reconstruction data. The desired projected image g c+p (i, j), about 650 frames;

[0037] (3) The patient g...

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Abstract

The invention discloses a method for correcting effect of a bed board and a positioning auxiliary device on image quality. The method comprises the following steps that: a patient gets up out of a bed after conventional scanning; the bed board and the positioning auxiliary device are scanned individually without changing the scanning parameters and the positions of the bed and the positioning auxiliary device; then the air is scanned by moving away the bed board and the positioning auxiliary device. As for a two-dimensional projection image, each frame of projection images obtained by scanning the patient with the bed board and the positioning auxiliary device is corrected by using projection data of the geometric positions corresponding to three scanning processes and according to an exponential attenuation rule of X ray in a substance and the energy response characteristic of a detection panel; and as for a three-dimensional CT image, the three-dimensional CT image of the patient is reconstructed by using the corrected projection image. As a result, the images of the bed board and the positioning auxiliary device in the two-dimensional projection image and the three-dimensional CT image can be deducted to reduce image artifacts caused by the bed board and the positioning auxiliary device, improve the contrast resolution of a soft tissue and achieve a clearer anatomical structure.

Description

technical field [0001] The invention relates to an image processing method, in particular to a method for correcting the influence of a bed board and a positioning auxiliary device on image quality. Background technique [0002] X-ray machines, Electronic Portal Imaging Devices (EPID) and Computed Tomography (Computed Tomography, CT) are widely used in various fields. These imaging devices either collect two-dimensional projection images to obtain two-dimensional plane images; or use the collected two-dimensional projection images to perform three-dimensional reconstruction to obtain three-dimensional stereoscopic images. [0003] In the medical field, the bed boards of hospital beds used in imaging devices and patient positioning aids are usually made of low-density non-metallic materials, such as carbon fiber materials. These materials have low density and low X-ray attenuation, thereby reducing the impact on image quality. However, these materials cannot be completely t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B6/03
Inventor 戴建荣门阔
Owner 戴建荣
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