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MOSFET Dosimetry for Radiation Dose Assessment of Bismuth Shielding of the Eye in Children

¹ All authors: Department of Radiology, Duke University Medical Center, DUMC Box 3808, Durham, NC 27705.

OBJECTIVE. The purpose of our study was to measure radiation dose to the orbit during pediatric cranial CT with and without bismuth shielding using a novel dosimetry system. Cranial CT was performed on a pediatric anthropomorphic phantom, with and without bismuth eye shields. A solid-state metal oxide semiconductor field effect transistor (MOSFET) dosimeter was used to obtain real-time dose measurements.

CONCLUSION. Bismuth shielding reduced radiation dose to the eye by up to 42%; shield artifact fell outside the diagnostic area of interest.

Keywords: bismuth shielding • CT • dosimetry • eye • head and neck imaging • pediatric imaging • radiation dose • safety

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