Department of Nuclear Medicine, All India Institute of Medical Sciences, E-81, Ansari Nagar (East), AIIMS Campus, New Delhi, 110029, India.
Jpn J Radiol. 2012 May;30(4):291-5. doi: 10.1007/s11604-011-0045-4. Epub 2012 Jan 14.
To assess the radiation exposure to nuclear medicine staff at a positron emission tomography-computed tomography (PET-CT) centre with high patient throughput.
This prospective study included 70 adult patients who underwent 18F-fluorodeoxyglucose (FDG) PET-CT for their clinical indications. The patients' actual injected FDG activity was calculated by subtracting the syringe activity (post-injection) from the loaded syringe activity (pre-injection). The instantaneous exposure to nuclear medicine staff involved in PET-CT imaging was measured. The instantaneous dose rate of the physicians was recorded during FDG injection and that of the technologist was recorded during the patient's positioning, respectively, at 1.0-m distance from the anterior chest using a calibrated portable gamma-ray survey meter.
The average FDG activity injected in adult patients was 308.5 MBq (range 173.1-438.8 MBq). The instantaneous exposure to the nuclear medicine (NM) physician during the injection time was 31 μSv/h (14-60 μSv/h). The instantaneous exposure to the NM technologist during positioning was 18 (10-34) μSv/h. With an average of 10 patients per day, the quarterly dose to physicians was 628 μSv and to technologists 182 μSv for 300 patients. The extrapolated annual dose was 2.5 mSv for physicians and 0.7 mSv for technologists, respectively.
Instantaneous exposure of nuclear medicine staff involved in PET-CT imaging at a busy tertiary care centre is within permissible limits of the International Commission on Radiological Protection (ICRP-103) (total <100 mSv over 5 years and not >50 mSv in a single year) and atomic energy regulatory board (total <100 mSv over 5 years and not >30 mSv in a single year).
评估高患者吞吐量的正电子发射断层扫描-计算机断层扫描（PET-CT）中心核医学工作人员的辐射暴露情况。
这项前瞻性研究包括 70 名接受 18F-氟脱氧葡萄糖（FDG）PET-CT 检查以进行临床检查的成年患者。通过从加载的注射器活性（注射前）中减去注射器活性（注射后）来计算患者的实际注射 FDG 活性。测量参与 PET-CT 成像的核医学工作人员的瞬时暴露量。在距前胸部 1.0 米处，使用经过校准的便携式伽马射线测量仪，分别记录 FDG 注射期间医师的瞬时剂量率和技术员在患者定位期间的剂量率。
成年患者平均注射 FDG 活性为 308.5 MBq（范围 173.1-438.8 MBq）。在注射期间，核医学（NM）医师的瞬时暴露量为 31 μSv/h（14-60 μSv/h）。在定位期间，NM 技术员的瞬时暴露量为 18（10-34）μSv/h。平均每天有 10 名患者，300 名患者的医师每季度剂量为 628 μSv，技术员为 182 μSv。推算的年剂量分别为医师 2.5 mSv，技术员 0.7 mSv。
在繁忙的三级护理中心进行 PET-CT 成像时，核医学工作人员的瞬时暴露量在国际辐射防护委员会（ICRP-103）（5 年内总剂量<100 mSv，且每年不超过 50 mSv）和原子能监管局规定的限值内（5 年内总剂量<100 mSv，且每年不超过 30 mSv）。
