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Kim Jung Min
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1992 Volume 48 Issue 3 Pages
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Routine chest radiography is generally imaged by high voltage technique but some radiological technologists use low voltage for imaging. High voltage in usually said between 120kV〜140kV. Some RTs like using heavy filtration but others seldom like using it. However, which is better for use, calcium tungustate film screen system or ortho system, and high contrast film or wide latitude c-type film for the exculusive use of chest radiography. We could not make a decision which is ideal method for use. In my opinion any method is not always excellent for chest radiography. In my experiments that I had at kaken Hospital in Japan last year I expect to keep the balance between image quality and diagnostic range, and to reduce radiation dose for patients. My experiments are as follows. 1. We have looked into skin dose and film dose with same D=1.8 lung field density in accordance with KVP (80〜140) and ADDED FILTER (NO〜1/16VL). 2. Scatter ratio and bucky factor have investigated with film method for 4 different grids. 3. We have compared with the evaluation between correlation of physical image quality (MTF) and optical diagnostic capability.
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Hesheng Chen, Zixi Yu
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1992 Volume 48 Issue 3 Pages
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Tranditional radiographic techniques also have important value in X-ray imaging techniques. The inspection of imaging ability of X-ray tube is a important factor. We use star test pattern to measure the size, resolution and expension of effective focal spot. However there is no unanimous opinion about the magnification rate when various sizes of focal spot are measured by means of star test pattern. The magnification rate and the basic principle of magnification technique for different focal spots are discussed in this paper.
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