Calculating prescription doses for new sources by biologically effective dose matching
| Autor: | Amarjit S. Saini, Kenneth M. Forster, Matthew C. Biagioli, Geoffrey Zhang, J. Pritz |
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| Rok vydání: | 2012 |
| Předmět: |
Male
medicine.medical_treatment Brachytherapy Sensitivity and Specificity Effective dose (radiation) Iodine Radioisotopes Humans Medicine Radiology Nuclear Medicine and imaging Medical prescription Radioisotopes business.industry Radiotherapy Planning Computer-Assisted Prostatic Neoplasms Reproducibility of Results Radiotherapy Dosage Clinical Practice Prescriptions Oncology Female business Nuclear medicine Previously treated Palladium Relative Biological Effectiveness |
| Zdroj: | Brachytherapy. 11:521-527 |
| ISSN: | 1538-4721 |
| Popis: | Purpose In current clinical practice, single isotopes, such as 125 I or 103 Pd, are used as single sources in prostate seed implants. A mixture of two radionuclides in the seeds has been proposed for prostate cancer treatment. This study investigates a method for determining the prescription dose for these new seeds using the biological effective dose (BED). Methods Ten prostate cancer cases previously treated using single radionuclide seeds were selected for this study. The BED distribution for these cases was calculated. Plans using other radionuclides were then calculated based on this BED distribution. Prescription values could then be obtained for the calculated plans. The method was verified by calculating the prescription dose for 103 Pd and 125 I and comparing to clinical values. The method was then applied to a hybrid seed that consisted of a mixture of 125 I and 103 Pd radionuclides, which deliver equal dose to 1 cm from the source in water (50/50D@1 cm). A prescription BED value was also calculated. Results A prescription BED of 110 Gy was found to correlate to a prescription dose of 145, 120, and 137 Gy for 125 I, 103 Pd, and 50/50D@1 cm hybrid seeds, respectively. Conclusion The method introduced in this article allows one to calculate the prescription dose for new and novel sources in brachytherapy. The method was verified by calculating a prescription dose for 125 I and 103 Pd radionuclides that coincides with values used clinically. |
| Databáze: | OpenAIRE |
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