Abstract
The dosimetric characteristics of mini-beams and dose distributions in beams used for radio surgery defer substantially from beams used in common radiotherapy. The aim of radio surgery is to deliver a high dose to the lesion in one single fraction, while minimizing the dose delivered to the surrounding normal brain tissue. This type of irradiation is performed with a number of continuous arcs located in various corneal (patient sitting) or sagittal (patient in a supine position) inclined planes using a linear accelerator. A treatment planning system should take into account a large number of irradiation parameters such as the collimator diameter, number of arcs, their angular positions, length and weight of the arcs. We analysed the influence of collimator diameters in the range of 6 to 20 mm using 15 MV X-rays and stereo-tactic irradiation of ellipsoidal inclined arterio venous malformations (AVMs) with a single isocenter. Special arc weights were used to obtain an optimized dose distribution with 13 arcs distributed over an angular sector of 120 deg. x 13 deg. In the two studies made we used 3 dimensional dosimetric calculations. The results were used for the treatment of patients and enabled the choice of the optimal irradiation configuration
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Plazas, M S;
[1]
Lefkopoulus, D;
Schlienger, M;
[2]
Merienne, L
[3]
- National Univ. of Colombia (Colombia)
- Service de Radiotherapie, Hopital Tenon, Paris (France). Unite de Radiophysique
- Hopital Sainte Anne, Paris (France). Service de Neurochirurgie
Citation Formats
Plazas, M S, Lefkopoulus, D, Schlienger, M, and Merienne, L.
Accuracy in radiosurgery: The influence of collimator diameters and arc weights on the dose distribution for single target.
IAEA: N. p.,
1996.
Web.
Plazas, M S, Lefkopoulus, D, Schlienger, M, & Merienne, L.
Accuracy in radiosurgery: The influence of collimator diameters and arc weights on the dose distribution for single target.
IAEA.
Plazas, M S, Lefkopoulus, D, Schlienger, M, and Merienne, L.
1996.
"Accuracy in radiosurgery: The influence of collimator diameters and arc weights on the dose distribution for single target."
IAEA.
@misc{etde_429949,
title = {Accuracy in radiosurgery: The influence of collimator diameters and arc weights on the dose distribution for single target}
author = {Plazas, M S, Lefkopoulus, D, Schlienger, M, and Merienne, L}
abstractNote = {The dosimetric characteristics of mini-beams and dose distributions in beams used for radio surgery defer substantially from beams used in common radiotherapy. The aim of radio surgery is to deliver a high dose to the lesion in one single fraction, while minimizing the dose delivered to the surrounding normal brain tissue. This type of irradiation is performed with a number of continuous arcs located in various corneal (patient sitting) or sagittal (patient in a supine position) inclined planes using a linear accelerator. A treatment planning system should take into account a large number of irradiation parameters such as the collimator diameter, number of arcs, their angular positions, length and weight of the arcs. We analysed the influence of collimator diameters in the range of 6 to 20 mm using 15 MV X-rays and stereo-tactic irradiation of ellipsoidal inclined arterio venous malformations (AVMs) with a single isocenter. Special arc weights were used to obtain an optimized dose distribution with 13 arcs distributed over an angular sector of 120 deg. x 13 deg. In the two studies made we used 3 dimensional dosimetric calculations. The results were used for the treatment of patients and enabled the choice of the optimal irradiation configuration for each patient. (author). 10 refs, 9 figs.}
place = {IAEA}
year = {1996}
month = {Aug}
}
title = {Accuracy in radiosurgery: The influence of collimator diameters and arc weights on the dose distribution for single target}
author = {Plazas, M S, Lefkopoulus, D, Schlienger, M, and Merienne, L}
abstractNote = {The dosimetric characteristics of mini-beams and dose distributions in beams used for radio surgery defer substantially from beams used in common radiotherapy. The aim of radio surgery is to deliver a high dose to the lesion in one single fraction, while minimizing the dose delivered to the surrounding normal brain tissue. This type of irradiation is performed with a number of continuous arcs located in various corneal (patient sitting) or sagittal (patient in a supine position) inclined planes using a linear accelerator. A treatment planning system should take into account a large number of irradiation parameters such as the collimator diameter, number of arcs, their angular positions, length and weight of the arcs. We analysed the influence of collimator diameters in the range of 6 to 20 mm using 15 MV X-rays and stereo-tactic irradiation of ellipsoidal inclined arterio venous malformations (AVMs) with a single isocenter. Special arc weights were used to obtain an optimized dose distribution with 13 arcs distributed over an angular sector of 120 deg. x 13 deg. In the two studies made we used 3 dimensional dosimetric calculations. The results were used for the treatment of patients and enabled the choice of the optimal irradiation configuration for each patient. (author). 10 refs, 9 figs.}
place = {IAEA}
year = {1996}
month = {Aug}
}