Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1881964 | Medical Dosimetry | 2014 | 6 Pages |
Abstract
The use of small field sizes is increasingly becoming important in radiotherapy particularly since the introduction of stereotactic radiosurgery and intensity-modulated radiation therapy techniques. The reliable measurement of delivered dose from such ï¬elds with conventional dosimeters, such as ionization chambers, is a challenging task. In this work, methacrylic and ascorbic acid in gelatin initiated by copper polymer gel dosimeters are employed to measure dose in 3 dimensions. Field sizes of 5 à 5 mm2, 10 à 10 mm2, 20 à 20 mm2, and 30 à 30 mm2 are investigated for a 6-MV x-rays. The results show an agreement with Gafchromic film, with some variation in measured doses near the edge of the ï¬elds, where the film data decrease more rapidly than the other methods. Dose penumbra widths obtained with gel dosimeters and Gafchormic film were generally in agreement with each other. The results of this work indicate that polymer gel dosimetry could be invaluable for the quantification of the 3-dimensional dose distribution in small field size.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Radiation
Authors
Hossein Hassani, Hassan Ali Ph.D., Mohammad Hassan Ph.D., Kaveh Shirani,