A phantom study on fetal dose reducing factors in pregnant patients with breast cancer during radiotherapy treatment


Öğretici A., Çakir A. , Akbaş U. , Köksal C. , KALAFAT Ü., Tambaş M. , ...Daha Fazla

JOURNAL OF MEDICAL PHYSICS, cilt.42, ss.128-132, 2017 (ESCI İndekslerine Giren Dergi) identifier identifier identifier

  • Cilt numarası: 42 Konu: 3
  • Basım Tarihi: 2017
  • Doi Numarası: 10.4103/jmp.jmp_133_16
  • Dergi Adı: JOURNAL OF MEDICAL PHYSICS
  • Sayfa Sayıları: ss.128-132

Özet

Purpose: This study aims to investigate the factors that reduce fetal dose in pregnant patients with breast cancer throughout their radiation treatment. Two main factors in a standard radiation oncology center are considered as the treatment planning systems (TPSs) and simple shielding for intensity modulated radiation therapy technique. Materials and Methods: TPS factor was evaluated with two different planning algorithms: Anisotropic analytical algorithm and Acuros XB (external beam). To evaluate the shielding factor, a standard radiological purpose lead apron was chosen. For both studies, thermoluminescence dosimeters were used to measure the point dose, and an Alderson RANDO-phantom was used to simulate a female pregnant patient in this study. Thirteen measurement points were chosen in the 32(nd) slice of the phantom to cover all possible locations of a fetus up to 8(th) week of gestation. Results: The results show that both of the TPS algorithms are incapable of calculating the fetal doses, therefore, unable to reduce them at the planning stage. Shielding with a standard lead apron, however, showed a slight radiation protection (about 4.7%) to the fetus decreasing the mean fetal dose from 84.8 mGy to 80.8 mGy, which cannot be disregarded in case of fetal irradiation. Conclusions: Using a lead apron for shielding the abdominal region of a pregnant patient during breast irradiation showed a minor advantage; however, its possible side effects (i.e., increased scattered radiation and skin dose) should also be investigated further to solidify its benefits.