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

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

Ana Cravo Sá1, Ana Fermento1, Dalila Neves1, Sara Ferreira1, Teresa Silva1, Carina Marques Coelho1, Aude Vaandering2, Ana Roma2, Sérgio Quaresma2, Emmanuel Bonnarens2
DOI: 10.1016/j.rpor.2017.12.007
Rep Pract Oncol Radiother 2018;23(1):61-67.

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.

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Reports of Practical Oncology and Radiotherapy