우리나라의 골반 및 요추 엑스선검사에서의 환자선량 권고량

Abstract

Purpose : Pelvis and lumbar spine radiography, among various types of diagnostic radiography, include gonads of the human body and give patients high radiation dose. Nevertheless, diagnostic reference levels for patient radiation dose in pelvis and lumbar spine radiography has not yet been established in Korea. Therefore, the radiation dose that patients receive from pelvis and lumbar radiography is measured and the diagnostic reference level on patient radiation dose for the optimization of radiation protection of patients in pelvis and lumbar spine radiography was established. Methods : The conditions and diagnostic imaging information acquired during the time of the postero-anterior view of the pelvis and the postero-anterior and lateral view of the lumbar spine at 125 medical institutions throughout Korea are collected for analysis and the entrance surface dose received by patients is measured using a glass dosimeter. The diagnostic reference levels for patient radiation dose in pelvis and lumbar spine radiography to be recommended to the medical institutes is arranged by establishing the dose from the patient radiation dose that corresponds to the 3rd quartile values as the appropriate diagnostic reference level for patient radiation dose. Results : According to the results of the assessment of diagnostic imaging information acquired from pelvis and lumbar spine radiography and the measurement of patient entrance surface dose taken at the 125 medical institutes throughout Korea, the tube voltage ranged between 60~97kVp, with the average use being 75kVp, and the tube current ranged between 8~123mAs, with the average use being 30mAs. In the posteroanterior and lateral views of lumbar spine radiography, the tube voltage of each view ranged between 65~100kVp (average use: 78kVp) and 70~109kVp (average use: 87kVp), respectively, and the tube current of each view ranged between 10~100mAs(average use: 35mAs) and between 8.9~300mAs(average use: 64mAs), respectively. The measurements of entrance surface dose that patients receive during the pelvis and lumbar spine radiography show the following results: in the posteroanterior view of pelvis radiography, the minimum value is 0.59mGy, the maximum value is 12.69mGy and the average value is 2.88 mGy with the 1st quartile value being 1.91mGy, the median being 0.59mGy, and the 3rd quartile value being 3.43mGy. Also, in the posteroanterior view of lumbar spine radiography, the minimum value is 0.64 mGy, the maximum value is 23.84mGy, and the average value is 3.68mGy with the 1st quartile value being 2.41mGy, the median being 3.40mGy, and the 3rd quartile value being 4.08mGy. In the lateral view of lumbar spine radiography, the minimum value is 1.90mGy, the maximum value is 45.42mGy, and the average value is 10.08mGy with the 1st quartile value being 6.03mGy, the median being 9.09mGy and the 3rd quartile value being 12.65mGy. Conclusions : The diagnostic reference levels for patient radiation dose to be recommended to the medical institutes in Korea is 3.42mGy for the posteroanterior view of pelvis radiography, 4.08mGy for the posteroanterior view of lumbar spine radiography, and 12.65mGy for the lateral view of lumbar spine radiography. Such values are all lower than the values recommended by 6 international organizations including World Health Organization, where the recommended values are 10mGy for the posteroanterior view of pelvis radiography, 10mGy for the posteroanterior view of lumbar spine radiography and 30mGy for the lateral view of lumbar spine radiography.