Development of collimator insert for linac based stereotactic irradiation

Singh, Rabi Raja ; Brindha, S. ; Ravindran, Paul B. ; John, Subhashini ; Rajshekhar, V. ; Rangad, Faith V. ; Roul, R. K. (1999) Development of collimator insert for linac based stereotactic irradiation Physics in Medicine and Biology, 44 (10). N223. ISSN 0031-9155

Full text not available from this repository.

Official URL: http://iopscience.iop.org/0031-9155/44/10/403

Related URL: http://dx.doi.org/10.1088/0031-9155/44/10/403

Abstract

The aim of this study is to develop collimator inserts of various sizes which are either not commercially available or are expensive to import. The dosimetry parameters such as tissue maximum ratio (TMR), off-axis ratio (OAR) and output factor of the developed collimator insert are compared with that of the commercial collimator insert (Radionics). In order to check the suitability of the collimator insert developed locally for clinical use and to standardize the method of development, a collimator insert of 15 mm identical to the one supplied by Radionics is developed with low-melting alloy (Cerrobend). Moreover for the clinical use of the developed collimator insert, certain acceptance tests are performed which include a collimator concentricity test, beam size check and radiation leakage test. The dose verification is carried out with a thermoluminescent dosimeter (7LiF rods) and an FBX chemical dosimeter in a human-head-shaped Perspex phantom filled with water. The variation between the calculated and measured dose is found to be within +2.4% for 7LiF rods and -2.0% for the FBX chemical dosimeter thus ensuring the suitability of the developed collimator insert for clinical use. This has encouraged us to standardize the method adapted to develop the collimator insert and to develop collimator inserts of different field sizes.

Item Type:Article
Source:Copyright of this article belongs to Institute of Physics.
ID Code:95462
Deposited On:06 Aug 2013 11:33
Last Modified:06 Aug 2013 11:33

Repository Staff Only: item control page