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American Journal of Roentgenology, Vol 154, 185-190, Copyright © 1990 by American Roentgen Ray Society

ARTICLES

Estimated fetal radiation dose from multislice CT studies

JP Felmlee, JE Gray, ML Leetzow and JC Price
Department of Diagnostic Radiology, Mayo Clinic and Foundation, Rochester, MN 55905.

It is often necessary to estimate the dose of radiation to a fetus from a series of CT scans. To assist in making this process easier and more accurate, we measured fetal doses in an adult anthropomorphic phantom for four CT scanners: Picker 1200, Siemens DRH, GE 9800, and GE 8800. Measurements were made at four kilovoltages (100, 120, 130, and 140 kVp), for 2-, 5-, 8-, and 10-mm thicknesses, for two scanning angles (360 degrees and 398 degrees) and for two patient orientations (prone and supine). The fetal-dose estimates are based on the CT dose index measured by using a pencil ionization chamber at the center position of a 16-cm-diameter cylindrical phantom. Comparison with data from other investigators shows reasonable agreement when phantom differences, X- ray tube output, and equipment calibration are considered.
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