Dosimetric Characteristics of Multileaf Collimator-based Intensity-modulated Arc Therapy for Stereotactic Radiosurgery.
- Author:
Sang Mo YUN
1
;
Sung Kyu KIM
Author Information
1. Department of Therapeutic Radiology and Oncology, College of Medicine, Yeungnam University, Daegu, Korea. kangsan@ynu.ac.kr
- Publication Type:Original Article
- Keywords:
Radiosurgery;
Multileaf collimator;
Intensity-modulated arc therapy;
Dosimetry
- MeSH:
Radiosurgery*;
Radiotherapy;
Radiotherapy, Intensity-Modulated*
- From:Korean Journal of Medical Physics
2007;18(2):93-97
- CountryRepublic of Korea
- Language:English
-
Abstract:
This study was designed to evaluate radiosurgery technique using multiple noncoplanar arc therapy with intensity modulated fine MLC shaped photon beam. The stereotactic radiosurgery was performed with 6-MV X-ray beams from a Clinac 21EX LINAC (Varian, Palo Alto, CA, USA) with a MLC-120, which features a full 40 x 40 cm field and is the first MLC for general use that offers 0.5 cm resolution for high precision treatment of small and irregular fields. We used a single isocenter and five gantry-couch combinations with a set of intensity modulated arc therapy. We investigated dosimetric characteristics of 2 cm sized spherical target volume with film (X-OMAT V2 film, Kodak Inc, Rochester NY, USA) dosimetry within 25 x 25 cm acrylic phantom. A simulated single isocentric treatment using inversely planned 3D radiotherapy planning system demonstrated the ability to conform the dose distribution to an spherical target volume. The 80% dose level was adequate to encompass the target volume in frontal, sagittal, and transverse planes, and the region between the 40% and 80% isodose lines was 4.0~4.5 mm and comparable to the dose distribution of the Boston Arcs. We expect that our radiosurgery technique could be a treatment option for irregular-shaped large intracranial target.
