open access

Vol 23, No 1 (2018)
Original research articles
Published online: 2018-01-01
Submitted: 2017-02-09
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Radiotherapy setup displacements in breast cancer patients: 3D surface imaging experience

Ana Cravo Sá, Ana Fermento, Dalila Neves, Sara Ferreira, Teresa Silva, Carina Marques Coelho, Aude Vaandering, Ana Roma, Sérgio Quaresma, Emmanuel Bonnarens
DOI: 10.1016/j.rpor.2017.12.007
·
Rep Pract Oncol Radiother 2018;23(1):61-67.

open access

Vol 23, No 1 (2018)
Original research articles
Published online: 2018-01-01
Submitted: 2017-02-09

Abstract

Aim

In this study, we intend to compare two different setup procedures for female breast cancer patients.

Background

Imaging in radiotherapy provides a precise localization of the tumour, increasing the accuracy of the treatment delivery in breast cancer.

Materials and methods

Twenty breast cancer patients who underwent whole breast radiotherapy (WBRT) were selected for this study. Patients were divided into two groups of ten. Group one (G1) was positioned by tattoos and then the patient positioning was adjusted with the aid of AlignRT (Vision RT, London, UK). In group two (G2), patients were positioned only by tattoos. For both groups, the first 15 fractions were analyzed, a daily kilovoltage (kV) cone beam computed tomography (CBCT) image was made and then the rotational and translational displacements and, posteriorly, the systematic (Σ) and random (σ) errors were analyzed.

Results

The comparison of CBCT displacements for the two groups showed a statistically significant difference in the translational left–right (LR) direction (ρ[[ce:hsp sp="0.25"/]]=[[ce:hsp sp="0.25"/]]0.03), considering that the procedure with AlignRT system has smaller lateral displacements. The results of systematic (Σ) and random (σ) errors showed that for translational displacements the group positioned only by tattoos (G2) demonstrated higher values of errors when compared with the group positioned with the aid of AlignRT (G1).

Conclusions

AlignRT could help the positioning of breast cancer patients; however, it should be used with another imaging method.

Abstract

Aim

In this study, we intend to compare two different setup procedures for female breast cancer patients.

Background

Imaging in radiotherapy provides a precise localization of the tumour, increasing the accuracy of the treatment delivery in breast cancer.

Materials and methods

Twenty breast cancer patients who underwent whole breast radiotherapy (WBRT) were selected for this study. Patients were divided into two groups of ten. Group one (G1) was positioned by tattoos and then the patient positioning was adjusted with the aid of AlignRT (Vision RT, London, UK). In group two (G2), patients were positioned only by tattoos. For both groups, the first 15 fractions were analyzed, a daily kilovoltage (kV) cone beam computed tomography (CBCT) image was made and then the rotational and translational displacements and, posteriorly, the systematic (Σ) and random (σ) errors were analyzed.

Results

The comparison of CBCT displacements for the two groups showed a statistically significant difference in the translational left–right (LR) direction (ρ[[ce:hsp sp="0.25"/]]=[[ce:hsp sp="0.25"/]]0.03), considering that the procedure with AlignRT system has smaller lateral displacements. The results of systematic (Σ) and random (σ) errors showed that for translational displacements the group positioned only by tattoos (G2) demonstrated higher values of errors when compared with the group positioned with the aid of AlignRT (G1).

Conclusions

AlignRT could help the positioning of breast cancer patients; however, it should be used with another imaging method.

Get Citation

Keywords

Breast cancer; Whole breast radiotherapy; 3D surface imaging; AlignRT; Cone beam computed tomography

About this article
Title

Radiotherapy setup displacements in breast cancer patients: 3D surface imaging experience

Journal

Reports of Practical Oncology and Radiotherapy

Issue

Vol 23, No 1 (2018)

Pages

61-67

Published online

2018-01-01

DOI

10.1016/j.rpor.2017.12.007

Bibliographic record

Rep Pract Oncol Radiother 2018;23(1):61-67.

Keywords

Breast cancer
Whole breast radiotherapy
3D surface imaging
AlignRT
Cone beam computed tomography

Authors

Ana Cravo Sá
Ana Fermento
Dalila Neves
Sara Ferreira
Teresa Silva
Carina Marques Coelho
Aude Vaandering
Ana Roma
Sérgio Quaresma
Emmanuel Bonnarens

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