An imaging method for x-ray radiography

Abstract

The invention discloses an imaging method used for X-radiography. The imaging method comprises the following steps of: setting a special shape aluminum filter at the central position of a light source of an X-ray machine when an X-ray machine and an X-ray detector are utilized to carry out mammography, absorbing low-energy photons sent by the X-ray machine by the special shape aluminum filter, reducing the quantity scope of received photons on the X-ray detector, and adjusting the X-ray intensity and the regional quantity of different positions of a breast model region, wherein the thickness of the special shape aluminum filter is gradually increased from the center to the external edge. The imaging method can reduce the quantity scope of the received photons on the X-ray detector, adjust the X-ray intensity and the regional quantity, and enhance the imaging quality.

Description

technical field [0001] The invention relates to the technical field of X-ray imaging, in particular to an imaging method for X-ray photography. Background technique [0002] At present, in mammary X-ray imaging techniques, such as mammography or breast-specific CT imaging, X-ray machines and X-ray detectors are used to perform two-dimensional or three-dimensional imaging of breast structures. In this configuration, the patient's breast is placed in the cone beam emitted by the X-ray machine, and the X-ray detector is used to capture the X-ray beam passing through the patient's breast. [0003] Breast X-ray imaging technology only uses mammary gland receptors as the detection object. According to the regular structure of mammary gland receptors, the X-ray intensity after passing through mammary gland receptors and reaching the detector has certain characteristics. The cross-section of mammary gland receptors is close to an elliptical shape. , and the attenuation path lengths...

AI Technical Summary

Problems solved by technology

[0003] Breast X-ray imaging technology only uses mammary gland receptors as the detection object. According to the regular structure of mammary gland receptors, the X-ray intensity after passing through mammary gland receptors and reaching the detector has certain characteristics. The cross-section of mammary gland receptors is close to an elliptical shape. , and the attenuation path lengths of X-rays in the mammary gland are different. The X-ray attenuation near the center of the mammary gland is relatively large, while the attenuation of X-rays far away from the center of the mammary gland is small. Therefore, the number of photons received by the detector ranges from bigger

[0004] Since the rays emitted from the X-ray tube have a wide energy spectrum, there are a large number of low-energy photons, which are easily absorbed by the patient, so they do not contribute much to X-ray imaging. In addition, due to the attenuation coefficient of X-rays Directly related to the energy of X-rays, the attenuation of the hardened beam is weakened when it passes through the object behind, so the total attenuation and the thickness of the breast receptor no longer satisfy the linear relationship, if these nonlinear projection data are not corrected , then the reconstructed image will be distorted, affecting the imaging quality

Images