[논문]Ge-68/Ga-68 Rod Sources을 이용한 방사능측정기의 정도관리

정승환; 진계환

doi:10.7742/jksr.2018.12.5.575

Ge-68/Ga-68 Rod Sources을 이용한 방사능측정기의 정도관리
Quality Management of Radionuclide Activity Meter using Ge-68/Ga-68 Rod Sources 원문보기

한국방사선학회 논문지 = Journal of the Korean Society of Radiology, v.12 no.5, 2018년, pp.575 - 582

초록
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PET와 PET/CT의 검사 영상품질관리를 위해서는 F-18 방사능측정기의 정도관리가 필요하다. Ge-68/Ga-68 Rod Sources을 선원을 이용하여 의료기관에서 사용하고 있는 5종류의 방사능측정기의 방사능 측정의 정확도와 정밀도를 확인하였다. CRC-15R, CRC-15 PET, CRC-712M, CRC-15 베타 및 CRC-25PET에 대한 측정값과 기준값 사이의 방사능 양에 따른 상관관계는 0.99999 (P <0.0001)로 매우 높은 선형성을 보였다. 정확도 테스트에서 CRC-15R, CRC-15 PET, CRC-712M, CRC-15 베타 및 CRC-25PET 모델은 각각 -3.232 %, -1.342 %, -2.815 %, -2.913 % 및 -3.089 %를 이었다. 국내와 국제기준인 정확도 ${\pm}10%$, 정밀도 ${\pm}5%$ 이내로 기준을 만족하였고 반감기가 짧은 F-18에 비하여 경제성 있고 비교적 긴 기간 동안 안정적으로 정도관리가 가능하다는 것을 확인하였다.

Abstract ▼ AI-Helper

This article compared accuracy of 5 types of radionuclide activity meters that are being used in medical institutions and proposed the correction factor for each radionuclide activity meters type, using Ge-68/Ga-68 radiation sources for scanner setting, regular scanner correction, attenuation correction, and normalization. The calibration constant between baseline values and measured values by CRC-15R, CRC-15 PET, CRC-712M, CRC-15 Beta, and CRC-25PET was 0.99999(P<0.0001), which showed very high linearity. In the accuracy test, CRC-15R, CRC-15 PET, CRC-712M, CRC-15 Beta, and CRC-25PET model showed -3.232%, -1.342%, -2.815%, -2.913%, and -3.089% respectively.

주제어

표/그림 (9)

그림 Fig. 1. Simplified decay scheme of F-18 and Ge-68/Ga-68.
그림 Fig. 2. Schematic diagram of the radionuclide activity meter.
그림 Fig. 3. Ge-68 calibrated rod sources typically have a calibration accuracy of ± 5%.
표 Table 1. Specifications for all radionuclide activity meter
표 Table 2. Specifications for Ge-68 calibrated rod sources
그림 Fig. 4. Spectrum measurement of F-18 peak using high purity Ge detector (HPGe)
그림 Fig. 5. Spectrum measurement of Ge-68/Ga-68 peak using high purity Ge detector (HPGe)
그림 Fig. 6. The linearity of radionuclide activity meter between the reference activity and the radionuclide activity meter measurement activity
그림 Fig. 7. The accuracy of radionuclide activity meter between the reference activity and the radionuclide activity meter measurement activity

AI 본문요약
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문제 정의

This study was conducted to address the need for the quality control of radionuclide activity meters. Precision is a measurement of test method reprod ucibility under normal operating conditions.

제안 방법

Further studies are needed regarding factors that affect the correction constant, such as volume, linearity, and geometric factors.

성능/효과

089% respectively, and met both domestic and international standards. Fourth, the correction constants obtained by utilizing68Ge/68Ga were 1.033, 1.014, 1.029, 1.030, and 1.032 for CRC-15R, CRC-15PET, CRC-712M, CRC-15 Beta, and CRC-25PET, respectively.
The average accuracy of CRC-15R, CRC-15 PET, CRC-712M, CRC-15 Beta, and CRC-25PET were −2.678, and the standard deviation (SD) was 0.764.
Third, values for comparative accuracy measurement using 68Ge/68Ga in the CRC-15R, CRC-15 PET, CRC-712M, CRC-15 Beta, and CRC-25PET calibrator models were −3.232%, −1.342%, −2.815%, −2.913%, and −3.089% respectively, and met both domestic and international standards.

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