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Photon Radiosurgery System – time stability of the calibration parameters
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Abstract
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) thereof, 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.
Abstract
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) thereof, 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.
Keywords
low energy X-rays; radiosurgery; interstitial radiotherapy
About this articleTitle
Photon Radiosurgery System – time stability of the calibration parameters
Journal
Reports of Practical Oncology and Radiotherapy
Issue
Pages
321-325
Published online
2005-01-01
DOI
10.1016/S1507-1367(05)71106-8
Bibliographic record
Rep Pract Oncol Radiother 2005;10(6):321-325.
Keywords
low energy X-rays
radiosurgery
interstitial radiotherapy
Authors
Andrzej Orlef
Zbigniew Maniakowski
Adam Bekman
Jerzy Wydmański