Evaluation of a new Fletcher Applicator using cesium-137
| Autor: | Judith Stitt Haas, Carl M. Mansfield, R. Dale Dean |
|---|---|
| Rok vydání: | 1980 |
| Předmět: |
Cancer Research
Radiation business.industry Genital Neoplasms Female medicine.medical_treatment Radiation dose Brachytherapy Isodose curves Radiotherapy Dosage Imaging phantom Oncology Mockup Cesium Radioisotopes medicine Dosimetry Humans Radiology Nuclear Medicine and imaging Female Nuclear medicine business Dose rate Aluminum |
| Zdroj: | International journal of radiation oncology, biology, physics. 6(11) |
| ISSN: | 0360-3016 |
| Popis: | The improved Fletcher Applicator ∗ ∗Nuclear Associates is a recent modification of the afterloading Fletcher system. Its aluminum construction reduces the weight by 50 % and is more comfortable for the patient. Removable caps contain medially placed tungsten screens that shield tissues anteriorly and posteriorly. When the caps are removed, the colpostats can be used as Delclos mini-ovoids. A method for evaluating the dosimetry of brachytherapy applicators in a water phantom was devised so this applicator could be studied and compared with other gynecologic applicators. The results show that the transmission ratios—the fraction of radiation transmitted through the tungsten shields—differ from those of the preloaded Fletcher colpostat, but are similar to the transmission ratios of the Fletcher-Suit applicator. There is a 10 % to 25 % reduction in the radiation dose to the region of the bladder trigone and anterior rectum with the shield containing cap in place. This percent reduction in dose is in agreement with other Fletcher applicators. Misalignment of the source basket within the colpostat, and motion of the source in the carrier cause variations in the dose rate at specific distances from the colpostat. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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