Towards image quality, beam energy and effective dose optimisation in digital thoracic radiography

被引:0
作者
J. H. Launders
A. R. Cowen
R. F. Bury
P. Hawkridge
机构
[1] Department of Medical Physics,
[2] 5th Floor the Wellcome Wing,undefined
[3] The General Infirmary,undefined
[4] Great George Street,undefined
[5] LEEDS,undefined
[6] West Yorkshire,undefined
[7] LS1 3EX,undefined
[8] UK,undefined
[9] Department of Radiology,undefined
[10] The General Infirmary,undefined
[11] Great George Street,undefined
[12] LEEDS,undefined
[13] West Yorkshire,undefined
[14] LS1 3EX,undefined
[15] UK,undefined
来源
European Radiology | 2001年 / 11卷
关键词
Key words Dose optimisation; Digital radiography; Image quality; Radiation dose; Radiation protection;
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学科分类号
摘要
This paper outlines how objective measurements of both image quality, in terms of signal-to-noise ratio, and effective dose may be used as tools to find the optimum kVp range for a digital chest radiography system. Measurements were made with Thoravision, an amorphous selenium-based digital chest X-ray system. The entrance surface dose and the effective dose to an anthropomorphic chest phantom were determined demonstrating how effective dose is related to beam quality. The image quality was measured using detective quantum efficiency, threshold contrast and a radiologist preference trial involving 100 patients. The results show that, despite the fact that the entrance surface dose decreases as the kVp increases, the effective dose, a better measure of the risk, reaches a minimum value between 90 and 110 kVp; however, the image quality decreases as the kVp increases. In this study the optimum kVp for chest radiography, using a selenium-based radiography system, is in the range 90–110 kVp. This is contrary to the 120- to 150-kVp range that is commonly used. Also, this study shows how objective measurements can be used to optimise radiographic technique without prolonged patient trials.
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页码:870 / 875
页数:5
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