open access

Vol 18, No 3 (2013)
Original research articles
Published online: 2013-05-01
Submitted: 2012-06-18
Get Citation

Effect of anode angle on photon beam spectra and depth dose characteristics for X-RAD320 orthovoltage unit

Asghar Mesbahi, Seyed-Salman Zakariaee
DOI: 10.1016/j.rpor.2012.12.001
·
Rep Pract Oncol Radiother 2013;18(3):148-152.

open access

Vol 18, No 3 (2013)
Original research articles
Published online: 2013-05-01
Submitted: 2012-06-18

Abstract

Background

In radiation therapy with orthovoltage units, the tube design has a crucial effect on its dosimetric features.

Aim

In this study, the effect of anode angle on photon beam spectra, depth dose and photon fluence per initial electron was studied for a commercial orthovoltage unit of X-RAD320 biological irradiator.

Materials and methods

The MCNPX MC code was used for modeling in the current study. We used the Monte Carlo method to model the X-RAD320 X-ray unit based on the manufacturer provided information. The MC model was validated by comparing the MC calculated photon beam spectra with the results of SpekCalc software. The photon beam spectra were calculated for anode angles from 15 to 35 degrees. We also calculated the percentage depth doses for some angles to verify the impact of anode angle on depth dose. Additionally, the heel effect and its relation with anode angle were studied for X-RAD320 irradiator.

Results

Our results showed that the photon beam spectra and their mean energy are changed significantly with anode angle and the optimum anode angle of 30 degrees was selected based on less heel effect and appropriate depth dose and photon fluence per initial electron.

Conclusion

It can be concluded that the anode angle of 30 degrees for X-RAD320 unit used by manufacturer has been selected properly considering the heel effect and dosimetric properties.

Abstract

Background

In radiation therapy with orthovoltage units, the tube design has a crucial effect on its dosimetric features.

Aim

In this study, the effect of anode angle on photon beam spectra, depth dose and photon fluence per initial electron was studied for a commercial orthovoltage unit of X-RAD320 biological irradiator.

Materials and methods

The MCNPX MC code was used for modeling in the current study. We used the Monte Carlo method to model the X-RAD320 X-ray unit based on the manufacturer provided information. The MC model was validated by comparing the MC calculated photon beam spectra with the results of SpekCalc software. The photon beam spectra were calculated for anode angles from 15 to 35 degrees. We also calculated the percentage depth doses for some angles to verify the impact of anode angle on depth dose. Additionally, the heel effect and its relation with anode angle were studied for X-RAD320 irradiator.

Results

Our results showed that the photon beam spectra and their mean energy are changed significantly with anode angle and the optimum anode angle of 30 degrees was selected based on less heel effect and appropriate depth dose and photon fluence per initial electron.

Conclusion

It can be concluded that the anode angle of 30 degrees for X-RAD320 unit used by manufacturer has been selected properly considering the heel effect and dosimetric properties.

Get Citation

Keywords

Monte Carlo modeling; X-RAD320 irradiator; Anode angle effect; Radiation therapy

About this article
Title

Effect of anode angle on photon beam spectra and depth dose characteristics for X-RAD320 orthovoltage unit

Journal

Reports of Practical Oncology and Radiotherapy

Issue

Vol 18, No 3 (2013)

Pages

148-152

Published online

2013-05-01

DOI

10.1016/j.rpor.2012.12.001

Bibliographic record

Rep Pract Oncol Radiother 2013;18(3):148-152.

Keywords

Monte Carlo modeling
X-RAD320 irradiator
Anode angle effect
Radiation therapy

Authors

Asghar Mesbahi
Seyed-Salman Zakariaee

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