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KMID : 1151820160100020109
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Journal of the Korean Society of Radiology
2016 Volume.10 No. 2 p.109 ~ p.115
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The Study for Optimal Exposure Condition of Chest Examination of Digital Radiography System
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Park Ji-Koon
Joeng Bong-Jae
Park Hyong-Hu
Noh Si-Cheol
Kang Sang-Sik
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Abstract
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Despite of increasing the use of the digital imaging device in the radiology area, the setting on the optimal
irradiation conditions are insufficient. In this study, the exposure dose and image quality by exposure condition
of digital radiography device were compared. The exposure doses were obtained by adjusting the exposure
condition as 5 steps respectively based on the exposure conditions that are currently used of CR and DR
radiography devices. The acquired image has been assessed by 20 medical image professors using the assessment method of the Japanese Society for Tuberculosis Prevent. As a result, in the case of the CR system, the better
image quality was obtained in the condition of 120 kVp and 1.5 mAs~2.4 mAs (quality score 91~95.5 points)
than standard exposure condition(110 kVp, 3.2 mAs, 86 points). And exposure dose was evaluated as low with
61.3~98.4 μGy than standard condition(105.1 μGy). In DR system, however, the image quality score was higher
as 97~98.6 points in the lower tube voltage range (112 kVp, 2.4~3.2 mAs) condition than the standard exposure
condition (125 kVp, 3.2 mAs, 91 points). In addition, the exposure dose was 61.5-77.2 μGy lower than standard
condition(93 μGy). In addition, the exposure dose was low as 61.5-77.2 μGy than standard condition(93 μGy).
With the results of this study, we confirmed that it is possible to reduce the patient exposure dose with the same image quality by adjusting the optimal exposure condition of digital device.
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KEYWORD
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Digital Imaging system, Patient Dose, Image Quality, Tube Voltage, milli-ampere second
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