Calculating prescription doses for new sources by biologically effective dose matching.
Brachytherapy
; 11(6): 521-7, 2012.
Article
en En
| MEDLINE
| ID: mdl-22436519
ABSTRACT
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 1cm 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.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Paladio
/
Neoplasias de la Próstata
/
Planificación de la Radioterapia Asistida por Computador
/
Braquiterapia
/
Radioisótopos de Yodo
Tipo de estudio:
Diagnostic_studies
Límite:
Female
/
Humans
/
Male
Idioma:
En
Revista:
Brachytherapy
Asunto de la revista:
RADIOTERAPIA
Año:
2012
Tipo del documento:
Article
País de afiliación:
Estados Unidos