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김화곤 ( ) - 지산간호보건전문대 방사선과
백원진 ( ) - 지산간호보건전문대 방사선과
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Abstract
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With transmitted dose through chest which has the problem of wide variations in absorption, simple Film/Screen Combination method makes it difficult to image lung field, mediastinum and retrocardiac areas.
In order to overcome this, it is very common to use the High Kilovoltage Technique in diminishing the differences between High and Low Contrast.
We have been adopting this method at Department of diagnostic Radiology, National University Hospital.
To compare the image of it with that of Low Kilovoltage Technique, we did radio-graphic tests using beans on the skin.
We marked off into three anatomical categories such as lungs, mediastinum and near diaphragm, then attached a bean on a marked area at random. In order to compare with High and Low, we took a radiography of High(120-140KV) and Low(70-90KV)
Kilovoltage
Techniques, respectively at the same time. We have bone experiments 320cases.
We evaluated the results of test in response to Sensitivity (true positive) and Specificity (true negative) In evaluating, we gave them points from 1 to 5 according to True or False. With given points by radiologist having much experiences, we
could
acquire the percentage of Sensitivity and Specificity.
The percentage made us to get the schematic table of ROC curve of those two methods.
Consequently, High Kilovoltage Technique appeared 18% better than Low Kilovoltage Technique for detecting beans with our apparatus.
Along wit the High Kilovoltage Technique (120-140KV0, rare earth screen has been developed and refined to high measure of absorptive capacity, which has considerably improved the quality of radiological images, but the limited dynamic range still
remains a problem. It is known that films of considerably wide latitudes which have expanded dynamic ranges are not good for images of sharp contrast for soft tissues, and that application of very high (200 or higher KV0 KV is also inimical to
formation
of images of good contrast. Thus, it is necessary to reconcile the contrast with the dynamic range of film
This paper will discuss the clinical usefulness of High Kilovoltage technique (120-140KV) of chest radiography currently in use at the Diagnostic radiology Department of the Hospital, by making a comparative evaluation of the ROC curves of High
and
Low
Kilovoltage Technique through experiments with simulated nodules.
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KeyWords
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원문 및 링크아웃 정보
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등재저널 정보
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