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Data and methods to estimate fetal dose from fluoroscopically guided prophylactic hypogastric artery balloon
G Solomou1, K Perisinakis2, D Tsetis1
1Department of Medical Physics, Faculty of Medicine, University of Crete, P.O. Box 2208, Heraklion, Crete 71003, Greece.
Purpose:
To provide data for estimation of fetal radiation dose (DF) from prophylactic hypogastric artery balloon occlusion (HABO) procedures.
Methods:
The Monte-Carlo-N-particle (MCNP) transport code and mathematical phantoms representing a pregnant patient at the ninth month of gestation were employed. PA, RAO 20° and LAO 20° fluoroscopy projections of left and right internal iliac arteries were simulated. Projection-specific normalized fetal dose (NFD) data were produced for various beam qualities. The effects of projection angle, x-ray field location relative to the fetus, field size, maternal body size, and fetal size on NFD were investigated. Presented NFD values were compared to corresponding values derived using a physical anthropomorphic phantom simulating pregnancy at the third trimester and thermoluminescence dosimeters.
Results:
NFD did not considerably vary when projection angle was altered by ±5°, whereas it was found to markedly depend on tube voltage, filtration, x-ray field location and size, and maternal body size. Differences in NFD < 7.5% were observed for naturally expected variations in fetal size. A difference of less than 13.5% was observed between NFD values estimated by MCNP and direct measurements.
Conclusions:
Data and methods provided allow for reliable estimation of radiation burden to the fetus from HABO.
