Measurement and calculation of ovary and fetus dose in extended field radiotherapy for 10 MV X rays

Subhash C. Sharma, Jeffrey F. Williamson, Faiz M. Khan, Chung K K Lee

Research output: Contribution to journalArticlepeer-review

40 Scopus citations


For patients undergoing extended and inverted Y field irradiation for the treatment of Hodgkin's disease, it is desirable to know the ovary and fetus dose accurately. Using a phantom loaded with thermoluminescent LiF dosimeters, doses as a function of distance from the edge of the field were measured for typical mantle, periaortic and inverted Y fields. In addition, ovarian dose for situation (1) ovaries located at midline behind uterus, and (2) ovaries displaced bilaterally to the iliac wings were measured and compared. Our results show that in situation (1) the dose is higher by a factor of 3 as opposed to situation (2). In addition, we show that the use of additional blocking to shield the patient from collimator leakage reduces the fetal dose significantly for mantle field irradiation. Our results indicate that Clarkson's algorithm can be applied with reasonable accuracy to estimate doses for points well outside the irradiated volume.

Original languageEnglish (US)
Pages (from-to)843-846
Number of pages4
JournalInternational Journal of Radiation Oncology, Biology, Physics
Issue number6
StatePublished - Jun 1981

Bibliographical note

Funding Information:
Presented at the Twenty-First Annual Meeting of the Ameri- can Association of Physicists in Medicine, Atlanta, Georgia, July 29-August 2, 1979. Reprint requests to: S. C. Sharma, Ph.D. This investigation was supported by Grant Number CA-15548, awarded by the National Cancer Institute, Department of Health, Education and Welfare.-


  • Extended field
  • Fetus
  • Ovary
  • Radiation dose


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