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KMID : 0377519880130020313
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Chung-Ang Journal of Medicine
1988 Volume.13 No. 2 p.313 ~ p.324
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Detectability of Pulmonary Nodule in Chest Phantom
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Abstract
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A variety of digital techniques such as computed tomography, ultrasonography, magnetic resonance imaging and digital subtraction arngiography have been used widely in the field of Radiology. But in the examination of chest, conventional radiography is still considered as the integral and most important diagnostic tool.
Recently digital technique has begun to be applied in chest radiography. Digital image has several ad-vantages over conventional screen-film image; Greater latitude and image processing by contrast and spatial frequency enhancement provide more diagnostic information and lower dose examination. Management of digital image may make total digital radiology department possible by introducing PALS (picture archiving and communication system). But few experimental data about the diagnostic value and range of appropriate exposure dose have been reported.
Author performed the experimental study of the delectability of pulmonary nodule in chest phantom and defining appropriate range of exposure dose in relation to varying kVp and mAs. Author compared the data between digital and screen-film system.
The results are as follows:
1. In conventional screen film image, the high or low dose than the ideal mAs level decreased quality
of image rapidly while digital image produced gradual change because of the wide latitude.
2. In the same exposure dose, the detectability of pulmonary nodule in the digital image was superior
to that of screen-film image.
3. In digital image, detectability of pulmonary nodule was not affected much by varying kVp.
4. Detectability of pulmonary nodule was slightly superior in the high frequency enhancement image.
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