钨吸收边缘滤过器对诊断X射线光谱、图像质量及患者吸收剂量的影响。

Effect of tungsten absorption edge filter on diagnostic x-ray spectra, image quality and absorbed dose to the patient.

作者信息

Yamaguchi C, Yamamoto T, Terada H, Akisada M

出版信息

Phys Med Biol. 1983 Mar;28(3):223-32. doi: 10.1088/0031-9155/28/3/003.

Abstract

The X-ray spectra from a tungsten-target diagnostic tube were measured with a lithium-drifted silicon detector. Four characteristic X-ray peaks were clearly observed. When a 0.05-0.3 mm thick tungsten absorption edge filter was added to the tube, the number of photons in the spectra above the K-absorption edge decreased dramatically. The effect of the absorption edge filter on image quality and on the absorbed dose were investigated by both measurement and Monte Carlo calculation. The absorbed dose to the patient is reduced without image quality, being degraded.

摘要

用锂漂移硅探测器测量了钨靶诊断管的X射线光谱。清晰地观察到四个特征X射线峰。当在管上添加一个厚度为0.05 - 0.3毫米的钨吸收边滤波器时，光谱中高于K吸收边的光子数量急剧减少。通过测量和蒙特卡罗计算研究了吸收边滤波器对图像质量和吸收剂量的影响。患者的吸收剂量降低了，而图像质量并未下降。