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KMID : 0357520210440030183
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Journal of Radiological Science and Technology
2021 Volume.44 No. 3 p.183 ~ p.187
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Effect of Field Size on the Clinical Exposure Index for Lumbar Spine X-ray Examination
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Park Hye-Min
Yoon Yong-Su
Kim Jung-Su
Jeong Hoi-Woun
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Abstract
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The field size of the lumbar spine X-ray examination, which belongs to the most frequent examination in general radiography, is 5 times wider than the width of the lumbar spine. Exposure index (EI) as per International Electrotechnical Commission has a proportional relationship with the dose incident on the image receptor for clinical protocols in addition to RQA5, which is a calibration beam quality. In this study, the effectiveness of the set field size was evaluated through the change of EI according to the size of field during lumbar spine X-ray examinations. Lumbar anterior- posterior and lateral examinations was performed using a whole-body phantom, and the national average exposure conditions of Korea investigated in 2017 were introduced for the X-ray exposure. As a result of comparing the EI displayed on the console of digital radiography system for the three field size in ① 18 × 36 cm2 ② 25 × 36 cm2 ③ 36 × 36 cm2, the EI values showed a tendency to increase as the field size increased. Since the patient dose, such as organ dose around the lumbar spine, increases as the field size becomes larger, thus, if the EI obtained from the field size at a level that does not interfere with diagnosis is set as a reference, the effectiveness of the field size can be evaluated through the EI displayed on the console when the lumbar spine X-ray examination is conducted.
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KEYWORD
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Digital Radiography System, Exposure Index, Field Size, Lumbar Examination, Patient Dose
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