Evaluation of dose variation during total skin electron irradiation using thermoluminescent dosimeters
- Univ. of Minnesota Hospital, Minneaspolis, MN (United States)
The purpose of this study was to determine acceptable dose variation using thermoluminescent dosimeters (TLD) in the treatment of Mycosis Fungoides with total skin electron beam (TSEB) irradiation. From 1983 to 1993, 22 patients were treated with total skin electron beam therapy in the standing position. A six-field technique was used to deliver 2 Gy in two days, treating 4 days per week, to a total dose of 35 to 40 Gy using a degraded 9 MeV electron beam. Thermoluminescent dosimeters were placed on several locations of the body and the results recorded. The variations in these readings were analyzed to determine normal dose variation for various body location during TSEB. The dose to flat surfaces of the body was essentially the same as the dose to the prescription point. The dose to tangential surfaces was within {plus_minus} 10% of the prescription dose, but the readings showed much more variation (up to 24%). Thin areas of the body showed large deviations from the prescription dose along with a large amount of variation in the readings (up to 22%). Special areas of the body, such as the perineum and eyelid, showed large deviations from the prescription dose along with very large (up to 40%) variations in the readings. The TLD results of this study will be used as a quality assurance check for all new patients treated with TSEB. The results of the TLDs will be compared with this baseline study to determine if the delivered dose is within acceptable ranges. If the TLD results fall outside the acceptable limits established above, then the patient position can be modified or the technique itself evaluated. 4 refs., 5 tabs.
- OSTI ID:
- 437133
- Journal Information:
- International Journal of Radiation Oncology, Biology and Physics, Vol. 33, Issue 2; Other Information: PBD: 30 Sep 1995
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BASIC STUDIES
56 BIOLOGY AND MEDICINE
APPLIED STUDIES
RADIOTHERAPY
EVALUATION
SPATIAL DOSE DISTRIBUTIONS
QUALITY ASSURANCE
CALIBRATION STANDARDS
PATIENTS
BIOLOGICAL RADIATION EFFECTS
MYCOSES
WHOLE-BODY IRRADIATION
VARIATIONS
RADIATION DOSES
TISSUE DISTRIBUTION
ELECTRON BEAMS
THERMOLUMINESCENT DOSEMETERS