open access

Vol 17, No 2 (2012)
Published online: 2012-03-01
Submitted: 2011-06-20
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Evaluation of combining bony anatomy and soft tissue position correction strategies for IMRT prostate cancer patients

Marta Adamczyk, Tomasz Piotrowski, Ewa Adamiak
DOI: 10.1016/j.rpor.2012.01.005
·
Rep Pract Oncol Radiother 2012;17(2):104-109.

open access

Vol 17, No 2 (2012)
Published online: 2012-03-01
Submitted: 2011-06-20

Abstract

Background

Radiotherapy treatment requires delivering high homogenous dose to target volume while sparing organs at risk. That is why accurate patient positioning is one of the most important steps during the treatment process. It reduces set-up errors which have a strong influence on the doses given to the target and surrounding tissues.

Aim

The aim of this study was to investigate the efficiency of combining bony anatomy and soft tissue imaging position correction strategies for patients with prostate cancer.

Materials and methods

The study based on pre-treatment position verification results determined for 10 patients using kV images and CBCT match. At the same patients’ position, two orthogonal kV images and set of CT scans were acquired. Both verification methods gave the information about patients’ position changes in vertical, longitudinal and lateral directions.

Results

For 93 verifications, the mean values of kV shifts in vertical, longitudinal and lateral directions equaled: −0.11[[ce:hsp sp="0.25"/]]±[[ce:hsp sp="0.25"/]]0.54[[ce:hsp sp="0.25"/]]cm, 0.26[[ce:hsp sp="0.25"/]]±[[ce:hsp sp="0.25"/]]0.38[[ce:hsp sp="0.25"/]]cm and −0.06[[ce:hsp sp="0.25"/]]±[[ce:hsp sp="0.25"/]]0.47[[ce:hsp sp="0.25"/]]cm, respectively. The same values achieved for CBCT matching equaled: 0.07[[ce:hsp sp="0.25"/]]±[[ce:hsp sp="0.25"/]]0.62[[ce:hsp sp="0.25"/]]cm, 0.22[[ce:hsp sp="0.25"/]]±[[ce:hsp sp="0.25"/]]0.36[[ce:hsp sp="0.25"/]]cm and −0.02[[ce:hsp sp="0.25"/]]±[[ce:hsp sp="0.25"/]]0.45[[ce:hsp sp="0.25"/]]cm. Statistically significant changes between the values of shifts received during the first week of treatment and the rest time of the irradiation process were found for 2 patients in the lateral direction and 2 patients in vertical direction among kV results and for 3 patients in the longitudinal direction among CBCT results. A significant difference between kV and CBCT match results was found in the vertical direction.

Conclusions

In clinical practice, CBCT combined with kV or even portal imaging improves precision and effectiveness of prostate cancer treatment accuracy.

Abstract

Background

Radiotherapy treatment requires delivering high homogenous dose to target volume while sparing organs at risk. That is why accurate patient positioning is one of the most important steps during the treatment process. It reduces set-up errors which have a strong influence on the doses given to the target and surrounding tissues.

Aim

The aim of this study was to investigate the efficiency of combining bony anatomy and soft tissue imaging position correction strategies for patients with prostate cancer.

Materials and methods

The study based on pre-treatment position verification results determined for 10 patients using kV images and CBCT match. At the same patients’ position, two orthogonal kV images and set of CT scans were acquired. Both verification methods gave the information about patients’ position changes in vertical, longitudinal and lateral directions.

Results

For 93 verifications, the mean values of kV shifts in vertical, longitudinal and lateral directions equaled: −0.11[[ce:hsp sp="0.25"/]]±[[ce:hsp sp="0.25"/]]0.54[[ce:hsp sp="0.25"/]]cm, 0.26[[ce:hsp sp="0.25"/]]±[[ce:hsp sp="0.25"/]]0.38[[ce:hsp sp="0.25"/]]cm and −0.06[[ce:hsp sp="0.25"/]]±[[ce:hsp sp="0.25"/]]0.47[[ce:hsp sp="0.25"/]]cm, respectively. The same values achieved for CBCT matching equaled: 0.07[[ce:hsp sp="0.25"/]]±[[ce:hsp sp="0.25"/]]0.62[[ce:hsp sp="0.25"/]]cm, 0.22[[ce:hsp sp="0.25"/]]±[[ce:hsp sp="0.25"/]]0.36[[ce:hsp sp="0.25"/]]cm and −0.02[[ce:hsp sp="0.25"/]]±[[ce:hsp sp="0.25"/]]0.45[[ce:hsp sp="0.25"/]]cm. Statistically significant changes between the values of shifts received during the first week of treatment and the rest time of the irradiation process were found for 2 patients in the lateral direction and 2 patients in vertical direction among kV results and for 3 patients in the longitudinal direction among CBCT results. A significant difference between kV and CBCT match results was found in the vertical direction.

Conclusions

In clinical practice, CBCT combined with kV or even portal imaging improves precision and effectiveness of prostate cancer treatment accuracy.

Get Citation

Keywords

Prostate cancer; Radiotherapy; IMRT

About this article
Title

Evaluation of combining bony anatomy and soft tissue position correction strategies for IMRT prostate cancer patients

Journal

Reports of Practical Oncology and Radiotherapy

Issue

Vol 17, No 2 (2012)

Pages

104-109

Published online

2012-03-01

DOI

10.1016/j.rpor.2012.01.005

Bibliographic record

Rep Pract Oncol Radiother 2012;17(2):104-109.

Keywords

Prostate cancer
Radiotherapy
IMRT

Authors

Marta Adamczyk
Tomasz Piotrowski
Ewa Adamiak

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