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Surface Dose Effects of Linen Coverings for Breast and Chest Wall Patients


J Fagerstrom

J Fagerstrom1*, E Hirata2, (1) University of Wisconsin, Madison, WI, (2) Queen's Medical Center, Honolulu, HI

PO-BPC-Exhibit Hall-2 Saturday  Room: Exhibit Hall

Purpose: To evaluate the effect of various linen patient coverings on surface dose of breast and chest wall patient geometry.

Methods: TLDs were placed on the chest wall surface of an anthropomorphic male RANDO phantom that was irradiated with photon tangent beams and electron enface fields with a circular block. The measurements were repeated with the phantom covered with a hospital gown, sheet, towel, all three items together, and without any coverings. Photon and electron beams of varying energies were used to reproduce typical patient treatments.

Results: There was an increase in measured surface dose due to the gown between 4.6 ± 2.1% and 6.9 ± 2.7% for photons, and 0.0 ± 3.6% to 3.0 ± 2.2% for electrons. The TLD readings showed an overall increase in dose with increasing thickness of covering for photons; however, electron results did not show a definitive relationship between surface dose and covering thickness due to statistical uncertainties associated with the TLD readings.

Conclusion: While further studies are needed to quantify the effect, initial TLD results suggest that draping patients with linen coverings may increase skin dose. An increase in surface dose was clear with photon irradiations mimicking patient treatments, though similar electron irradiations demonstrated inconclusive results.

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