Spot scanning using radioactive C-11 beams for heavy-ion radiotherapy

Citation
E. Urakabe et al., Spot scanning using radioactive C-11 beams for heavy-ion radiotherapy, JPN J A P 1, 40(4A), 2001, pp. 2540-2548
Citations number
19
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Volume
40
Issue
4A
Year of publication
2001
Pages
2540 - 2548
Database
ISI
SICI code
0021-4922(200104)40:4A<2540:SSURCB>2.0.ZU;2-8
Abstract
A scheme for spot scanning using C-11 beams has been developed in order to form and verify a three-dimensionally conformal irradiation field for cance r radiotherapy. By selecting the momentum spread of a C-11 beam, we could c onsiderably decrease the distal falloff of the irradiation field, thus cons erving the beam quality. To estimate and optimize the dose distribution in the irradiation field, it is essential to evaluate the precise dose distrib ution of spot beams. The coupling of the lateral dose and depth-dose distri butions originating from a wide momentum spread should be taken into accoun t to calculate the dose distribution of C-11 beams. The reconstructed dose distribution of the irradiation field was in good agreement with the experi mental results, i.e., within +/-0.2%. An irradiation field of 35 x 35 x 43 mm(3) was optimized and spot scanning using C-11 beams was carried out. The flatness was within +/-2.3 % with an error of 1% in the detector resolutio n.