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- W240369967 endingPage "2077" @default.
- W240369967 startingPage "2077" @default.
- W240369967 abstract "2077 Objectives The goal of this study was to check the prevalence of those patient who exceed the NRC regulatory limit measured post-imaging session. Methods Fifty-three patients(28 male, 25 female) were surveyed immediately post FDG PET/CT scanning using a calibrated survey meter at 1 m distance. Range of FDG injected dose was from 5.6 to 19.2 mCi. On average, patients were surveyed 85.8±7.1 min post-injection. The formula D=C.A.Fv.Fd has been used to calculate the theoretical dose rate where D is the dose rate in µSv/hr, C is the patient dose rate constant, A is the injected activity in MBq, Fv is the voiding factor (0.85),and Fd is the dose decay correction factor. Results The average dose rate for the entire population was 17.6±2.9 uSv/hr. The mean injected FDG activity was 11.3±2.5 mCi. For measured and calculated dose rate exceeding the regulatory limit, the total number of patients was 19 and 20 accounting for a percentage of 35.8% and 37.7% respectively. The average injected dose for those patients was 13.06±2.3 and 13.76±1.7 mCi respectively. Based on experimental measurements,the threshold injected dose below which patient can be released was 9.6 mCi while the theoretical value was 11.7 mCi recorded at 81 min and 80 min post-injection respectively. Conclusions A patient release injected dose has been derived and theoretically estimated for patient undergoing FDG PET/CT scanning. On average, one-third of the patient population needs additional time to allow for dose decay so that discharge can comply with regulatory limits. The theoretical estimation agrees reasonably to the measured data. However, these measurements should be performed on an institutional basis due to many interplaying factors that include standardized uptake time, injection dose scheme, imaging time, patient release criteria and adopted regulatory limits." @default.
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- W240369967 date "2014-05-01" @default.
- W240369967 modified "2023-09-24" @default.
- W240369967 title "Patient release criteria of FDG PET/CT scanning: A local institutional derived limits" @default.
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