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Volume 10, Number 6, 2005

Photon Radiosurgery System – time stability of the calibration parameters

Andrzej Orlef, Zbigniew Maniakowski, Adam Bekman, Jerzy Wydmański

Summary:

Aim The aim of the paper is to present the time stability of the calibration parameters of a miniature 50 kV Photon Radiosurgery System used during surgical procedures to irradiate tumour beds.
Materials/Methods Before tumour irradiation, calibration procedures were performed and individual treatment times were calculated. During quality control procedures, parameters such as probe straightness, isotropy of the beam and stability of the internal and external monitors were checked. Also output dose rate was measured.
Results The average values of the parameters measured, and percentage deviations (1 SD)there of, were as follows: probe straightness 0.035 mm (22.1%); isotropy of the beam 5.72% (3.5%); internal monitor reading 8.182 E4 104 (0.7%); external monitor reading 2.932 Hz (3.1%); output dose rate 2.731 Gy/min (1.8%).
Conclusions High stability of the calibration parameters was observed. Measurement of probe deviation is a necessary condition in each radiotherapy procedure.

Signature: Rep Pract Oncol Radiother, 2005; 10(6) : 321-325

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Indexed in: EMBASE®, the Excerpta Medica database, the Elsevier BIOBASE (Current Awareness in Biological Sciences) and in the Index Copernicus.

http://www.sciencedirect.com/science/journal/15071367/19/2