The NORMAN phantom vs. the BOMAB phantom: are they different?

Abstract

This paper describes the implementation of the NORMAN phantom with the Human Monitoring Laboratory's Monte Carlo simulator, the problems that were encountered, and their solution. The NORMAN phantom has been compared with the reference man BOMAB phantom in three different whole body counting geometries: a scanning detector system (WBC1), and two stand-up whole body counters (WBC2, WBC3) that have different reference points for their counting geometry. The average agreement (taken over all energies) of the two phantoms is approximately a factor of 1.15 on any given counting system. For the first two systems (WBC1, WBC2) the BOMAB has the highest counting efficiency, whereas it is reversed on the third system (WBC3). Considering the differences between the two phantoms, the agreement is good.

MaMP and FeMP: computational mesh phantoms applied for studying the variation of WBC efficiency using a NaI(Tl) detector

“…For the WHR no linear correlation was found. Similar results were observed by Kramer et al [18], which demonstrated that the linearity may differ for different counting systems and different source geometries. In conclusion, no parameter could be found to relate the counting efficiency to the body geometry.…”

“…As previously reported [2,[18][19][20], it may not always be appropriate to describe the calibration factor to have a linear relationship to parameters such as body build index (BBI)-(weight/height) 1/2 -or body mass index (BMI)-(weight/height 2 )and also, it may not be the same for different counting geometries (flat bed, reclining chair, types of detectors used, and the detector position in respect to the person being measured, etc).…”

“…In order to reduce these difficulties, and to understand the CE variation in the results found, a correlation between the CE, the WHR, the WCR and the trunk volume was also studied. Krstic et al [4] and Kramer et al [18] investigated the influence of body mass on efficiency for the ORNL phantom [24] and BOMAB, a mathematical and modular phantom type. The results showed that, for the cases studied, CE increases as the body mass decreases.…”