open access

Vol 11, No 4 (2006)
Published online: 2006-01-01
Submitted: 2006-02-09
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Comparative analysis of stereotactic radiosurgery treatment plans in brain cases with one and two tumour changes using conformity indices

Michał Biegała, Łukasz Wieczorkowski, Michał Spych
DOI: 10.1016/S1507-1367(06)71065-3
·
Rep Pract Oncol Radiother 2006;11(4):197-204.

open access

Vol 11, No 4 (2006)
Published online: 2006-01-01
Submitted: 2006-02-09

Abstract

Aim

To analyse (quantitatively-statistically) conformity indices calculated for stereotactic radiosurgery treatment plans with one and two isocentres in cases of brain tumour.

Materials/Methods

A retrospective study of 33 patients with brain tumours treated between April 2005 and January 2006 was performed in the Radiotherapy Department of the Oncology Centre in Łódź. Stereotactic surgery was performed in all patients. All treatment plans were divided into two groups: plans with one isocentre and plans with two isocentres. For each treatment plan various kinds of conformity parameters were calculated and optimal prescription isodose level was determined.

Results

All conformity indices are within ranges and were accepted. Their values are lower in plans with two isocentres in comparison to plans with one isocentre.

Conclusions

Conformity indices are very helpful in the analysis of treatment plans, but they do not give real insight into all aspects of plans. Prescription isodose should completely enclose PTV volume. Optimal prescription isodose does not cover PTV; thus from a clinical point of view it is inapplicable.

Abstract

Aim

To analyse (quantitatively-statistically) conformity indices calculated for stereotactic radiosurgery treatment plans with one and two isocentres in cases of brain tumour.

Materials/Methods

A retrospective study of 33 patients with brain tumours treated between April 2005 and January 2006 was performed in the Radiotherapy Department of the Oncology Centre in Łódź. Stereotactic surgery was performed in all patients. All treatment plans were divided into two groups: plans with one isocentre and plans with two isocentres. For each treatment plan various kinds of conformity parameters were calculated and optimal prescription isodose level was determined.

Results

All conformity indices are within ranges and were accepted. Their values are lower in plans with two isocentres in comparison to plans with one isocentre.

Conclusions

Conformity indices are very helpful in the analysis of treatment plans, but they do not give real insight into all aspects of plans. Prescription isodose should completely enclose PTV volume. Optimal prescription isodose does not cover PTV; thus from a clinical point of view it is inapplicable.

Get Citation

Keywords

brain tumours; stereotactic radiosurgery; conformity index; optimal prescription isodose

About this article
Title

Comparative analysis of stereotactic radiosurgery treatment plans in brain cases with one and two tumour changes using conformity indices

Journal

Reports of Practical Oncology and Radiotherapy

Issue

Vol 11, No 4 (2006)

Pages

197-204

Published online

2006-01-01

DOI

10.1016/S1507-1367(06)71065-3

Bibliographic record

Rep Pract Oncol Radiother 2006;11(4):197-204.

Keywords

brain tumours
stereotactic radiosurgery
conformity index
optimal prescription isodose

Authors

Michał Biegała
Łukasz Wieczorkowski
Michał Spych

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