open access

Vol 12, No 5 (2007)
Untitled
Published online: 2007-09-01
Submitted: 2007-04-06
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Monte Carlo study on the impact of spinal fixation rods on dose distribution in photon beams

Asghar Mesbahi, Farshad Seyed Nejad
DOI: 10.1016/S1507-1367(10)60064-8
·
Rep Pract Oncol Radiother 2007;12(5):261-266.

open access

Vol 12, No 5 (2007)
Untitled
Published online: 2007-09-01
Submitted: 2007-04-06

Abstract

Background

Metal spinal rods are used as fixation devices in spinal surgery. The attenuation effect of these rods has not been completely studied for patients with spinal rods and requiring spinal radiotherapy.

Aim

The purpose of the current study was to investigate the dosimetric perturbation effect of metallic spinal rods in different photon beams.

Materials/Methods

Three photon beams of 6, 9 and 15MV were modelled using MCNP4C Monte Carlo (MC) code. The geometry consisted of two spinal rods at a depth of 4cm and a water phantom was used for MC calculations. The beam profiles at depths of 5.5, 6.5 and 7.5cm were calculated.

Results

Dose reductions of 10.2–11.2% and 5–6.2% were observed for steel and titanium rods respectively. The insertion of metallic rods into the photon beams did not change the spinal cord received dose but the effect of both types of rods on the target region behind the rods cannot be ignored, especially for steel rods.

Conclusions

Our results suggest that for reliable spinal radiotherapy the dose attenuation effect of spinal rods must be taken into account in treatment planning calculations.

Abstract

Background

Metal spinal rods are used as fixation devices in spinal surgery. The attenuation effect of these rods has not been completely studied for patients with spinal rods and requiring spinal radiotherapy.

Aim

The purpose of the current study was to investigate the dosimetric perturbation effect of metallic spinal rods in different photon beams.

Materials/Methods

Three photon beams of 6, 9 and 15MV were modelled using MCNP4C Monte Carlo (MC) code. The geometry consisted of two spinal rods at a depth of 4cm and a water phantom was used for MC calculations. The beam profiles at depths of 5.5, 6.5 and 7.5cm were calculated.

Results

Dose reductions of 10.2–11.2% and 5–6.2% were observed for steel and titanium rods respectively. The insertion of metallic rods into the photon beams did not change the spinal cord received dose but the effect of both types of rods on the target region behind the rods cannot be ignored, especially for steel rods.

Conclusions

Our results suggest that for reliable spinal radiotherapy the dose attenuation effect of spinal rods must be taken into account in treatment planning calculations.

Get Citation

Keywords

spinal implants; spinal radiotherapy; Monte Carlo Method; dose attenuation effect

About this article
Title

Monte Carlo study on the impact of spinal fixation rods on dose distribution in photon beams

Journal

Reports of Practical Oncology and Radiotherapy

Issue

Vol 12, No 5 (2007)

Pages

261-266

Published online

2007-09-01

DOI

10.1016/S1507-1367(10)60064-8

Bibliographic record

Rep Pract Oncol Radiother 2007;12(5):261-266.

Keywords

spinal implants
spinal radiotherapy
Monte Carlo Method
dose attenuation effect

Authors

Asghar Mesbahi
Farshad Seyed Nejad

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