open access

Vol 14, No 4 (2009)
Untitled
Published online: 2009-07-01
Submitted: 2009-05-15
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The new two-component conformity index formula (TCCI) and dose-volume comparisons of the pituitary gland and tonsil cancer IMRT plans using a linear accelerator and helical Tomotherapy

Tomasz PIOTROWSKI, Piotr MARTENKA, Nathalie de PATOUL, Agata JODDA, Maxime COEVOET, Julian MALICKI, Stefaan VYNCKIER
DOI: 10.1016/S1507-1367(10)60028-4
·
Rep Pract Oncol Radiother 2009;14(4):133-145.

open access

Vol 14, No 4 (2009)
Untitled
Published online: 2009-07-01
Submitted: 2009-05-15

Abstract

Background/Aim

To examine the new dose-volume verification tool, called the two-component conformity index formula (TCCI), for tumours of the pituitary gland and tonsil cancer IMRT plans using helical Tomotherapy and a linear accelerator.

Material and Methods

10 medically inoperable patients – 5 with tumour of the pituitary gland and 5 tonsil cancers – were considered. Tomotherapy and Eclipse plans were compared by DVH analysis and new TCCI analysis including: 1/ the physician's intents for dose distribution in PRVs, 2/ more than one dose-volume constraint for dose distribution in PTV and healthy tissues, and 3/ separation between coverage and excess components.

Results

DVH analysis shows differences for the PTV received doses close to the prescription dose (PD): 1/in pituitary gland, Eclipse – 61% of PTV volume enclosed by PD and Tomotherapy – 50%, and 2/in tonsil cancer, Eclipse plans – 44% and Tomotherapy – 55%. These differences were clinically confirmed for tonsil cancer through TCCI analysis. Moreover, TCCI analysis shows better coverage of PTV volume through 90% and 95% isodose levels for Tomotherapy plans. Better high dose region reduction for brain stem and optic chiasm in pituitary gland and middle dose region reduction for parotids and spinal cord in tonsil and dose reduction in healthy tissues reported by TCCI analysis were observed for Tomotherapy plans.

Conclusions

The usefulness of the information provided means that TCCI could be used as a primary or alternative method of quick dose-volume verification finally supported by advanced DVH analysis.

Abstract

Background/Aim

To examine the new dose-volume verification tool, called the two-component conformity index formula (TCCI), for tumours of the pituitary gland and tonsil cancer IMRT plans using helical Tomotherapy and a linear accelerator.

Material and Methods

10 medically inoperable patients – 5 with tumour of the pituitary gland and 5 tonsil cancers – were considered. Tomotherapy and Eclipse plans were compared by DVH analysis and new TCCI analysis including: 1/ the physician's intents for dose distribution in PRVs, 2/ more than one dose-volume constraint for dose distribution in PTV and healthy tissues, and 3/ separation between coverage and excess components.

Results

DVH analysis shows differences for the PTV received doses close to the prescription dose (PD): 1/in pituitary gland, Eclipse – 61% of PTV volume enclosed by PD and Tomotherapy – 50%, and 2/in tonsil cancer, Eclipse plans – 44% and Tomotherapy – 55%. These differences were clinically confirmed for tonsil cancer through TCCI analysis. Moreover, TCCI analysis shows better coverage of PTV volume through 90% and 95% isodose levels for Tomotherapy plans. Better high dose region reduction for brain stem and optic chiasm in pituitary gland and middle dose region reduction for parotids and spinal cord in tonsil and dose reduction in healthy tissues reported by TCCI analysis were observed for Tomotherapy plans.

Conclusions

The usefulness of the information provided means that TCCI could be used as a primary or alternative method of quick dose-volume verification finally supported by advanced DVH analysis.

Get Citation

Keywords

Tomotherapy; IMRT; DVH; Conformity Index

About this article
Title

The new two-component conformity index formula (TCCI) and dose-volume comparisons of the pituitary gland and tonsil cancer IMRT plans using a linear accelerator and helical Tomotherapy

Journal

Reports of Practical Oncology and Radiotherapy

Issue

Vol 14, No 4 (2009)

Pages

133-145

Published online

2009-07-01

DOI

10.1016/S1507-1367(10)60028-4

Bibliographic record

Rep Pract Oncol Radiother 2009;14(4):133-145.

Keywords

Tomotherapy
IMRT
DVH
Conformity Index

Authors

Tomasz PIOTROWSKI
Piotr MARTENKA
Nathalie de PATOUL
Agata JODDA
Maxime COEVOET
Julian MALICKI
Stefaan VYNCKIER

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