Assessment of radiotherapy setup displacements using 3D surface system in breast cancer patients

Authors

  • Buncha Pantang Division of radiation oncology, Department of radiology, King Chulalongkorn Memorial Hospital
  • Kanokporn Muangkamporn Division of radiation oncology, Department of radiology, King Chulalongkorn Memorial Hospital
  • Pattraporn Thasasi Division of radiation oncology, Department of radiology, King Chulalongkorn Memorial Hospital
  • Sakultala Reunjit Division of diagnostic radiology, Department of radiology, King Chulalongkorn Memorial Hospital
  • Panicha Nualsutha Division of radiation oncology, Department of radiology, King Chulalongkorn Memorial Hospital
  • Taweep Saenghangthum Division of radiation oncology, Department of radiology, Faculty of medicine, Chulalongkorn University

Keywords:

random error, systematic error, 3D surface imaging, breast cancer

Abstract

Background: Radiotherapy is one of the methods of breast cancer treatments. Fractionated radiotherapy requires an accuracy and precise patient positioning.

Objective: The aim of this study was to assess radiotherapy set up displacements between two different setup procedures including the breast size.

Materials and methods: The patient positioning of 10 breast cancer patients who underwent whole breast radiotherapy was verified by eight fractions of cone beam computed tomography. The translational and rotational displacements were evaluated. The first procedure (P1) was patients setting up using room laser and skin marks, while the second procedure (P2) was setting up using skin marks and then the patient positioning was adjusted with the aid of AlignRT.

Results: The comparison of both displacement procedures showed nonsignificantly better results when AlignRT was used in both translation and rotation. When the patient setup error with the breast size comparison was evaluated, it was found that using AlignRT was better for the small breast size in vertical direction and large breast size in longitudinal direction. Moreover, systematic (gif.latex?\dpi{50}&space;\sum) and random (gif.latex?\sigma) errors showed the smaller displacements results when AlignRT system was applied in almost all directions.

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

References

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Published

2020-05-15

How to Cite

1.
Pantang B, Muangkamporn K, Thasasi P, Reunjit S, Nualsutha P, Saenghangthum T. Assessment of radiotherapy setup displacements using 3D surface system in breast cancer patients. J Thai Assn of Radiat Oncol [Internet]. 2020 May 15 [cited 2024 Apr. 19];26(1):R68-R75. Available from: https://he01.tci-thaijo.org/index.php/jtaro/article/view/230897

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Original articles