open access

Vol 11, No 1 (2006)
Published online: 2006-01-01
Submitted: 2004-04-02
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Evaluation of spinal cord risk during HDR brachytherapy in patients with nasopharyngeal cancer

Anysja Zuchora, Renata Kabacińska, Joanna Terlikiewicz
DOI: 10.1016/S1507-1367(06)71044-6
·
Rep Pract Oncol Radiother 2006;11(1):9-12.

open access

Vol 11, No 1 (2006)
Published online: 2006-01-01
Submitted: 2004-04-02

Abstract

Aim

Use of Rotterdam applicators was analysed for the purpose of ascertaining the average dose to the spinal cord at the point of greatest load.

Materials/Methods

20 procedures carried out on patients treated in the brachytherapy department were evaluated. Rotterdam nosopharynx applicators were positioned and localised according to the “box technique”. The radiographs were used to reconstruct the applicator in PLATO NPS version 14.1.3 treatment planning system. The position of spinal cord points were inserted according to the radiographs. The highest-loaded points were chosen to analyze.

Results

Points were localized (along the cord) to within an average accuracy of 0.52 mm. A comparison of doses in the cord at these points was carried out and the average dose using geometrical optimization (on distance) was 19.7% of the reference dose while without optimisation the average was 18.7% of the reference dose.

Conclusions

From the study undertaken, it appears that the calculated doses in the spinal cord, at the points of greatest load, are as described in the published data. The Rotterdam applicator may be used equally for radical treatment and for locally increasing the dose (boost) because of an acceptable spinal cord dose.

Abstract

Aim

Use of Rotterdam applicators was analysed for the purpose of ascertaining the average dose to the spinal cord at the point of greatest load.

Materials/Methods

20 procedures carried out on patients treated in the brachytherapy department were evaluated. Rotterdam nosopharynx applicators were positioned and localised according to the “box technique”. The radiographs were used to reconstruct the applicator in PLATO NPS version 14.1.3 treatment planning system. The position of spinal cord points were inserted according to the radiographs. The highest-loaded points were chosen to analyze.

Results

Points were localized (along the cord) to within an average accuracy of 0.52 mm. A comparison of doses in the cord at these points was carried out and the average dose using geometrical optimization (on distance) was 19.7% of the reference dose while without optimisation the average was 18.7% of the reference dose.

Conclusions

From the study undertaken, it appears that the calculated doses in the spinal cord, at the points of greatest load, are as described in the published data. The Rotterdam applicator may be used equally for radical treatment and for locally increasing the dose (boost) because of an acceptable spinal cord dose.

Get Citation

Keywords

Brachytherapy; Spinal cord; Rotterdam applicator

About this article
Title

Evaluation of spinal cord risk during HDR brachytherapy in patients with nasopharyngeal cancer

Journal

Reports of Practical Oncology and Radiotherapy

Issue

Vol 11, No 1 (2006)

Pages

9-12

Published online

2006-01-01

DOI

10.1016/S1507-1367(06)71044-6

Bibliographic record

Rep Pract Oncol Radiother 2006;11(1):9-12.

Keywords

Brachytherapy
Spinal cord
Rotterdam applicator

Authors

Anysja Zuchora
Renata Kabacińska
Joanna Terlikiewicz

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