For vaginal cylinder HDR in the setting of adjuvant endometrial cancer radiation, do you routinely alter the prescription dose based on the diameter of the cylinder?
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2 Answers
Mednet Member
Radiation Oncology · University of Texas MD Anderson Cancer Center
The prescription dose will remain the same regardless of the size of the cylinder that is used and should be specified to the vaginal surface (often 6 Gy x 5) or to 5 mm depth (often 7 Gy x 3). Because of the inverse square law, the dose to the non-prescription point will vary as a function of cylin...