Evaluation of the Interchangeability of Cone Beam Computed Tomography and Catalyst for Patient Positioning in Radiotherapy for Head and Neck Cancer Patients

Hewala, Taha I.; Fahmy, Mohamed A.; El-Benhawy, Sanaa A.; Ammar, Hany M.

doi:10.30476/mejc.2023.97547.1866

Evaluation of the Interchangeability of Cone Beam Computed Tomography and Catalyst for Patient Positioning in Radiotherapy for Head and Neck Cancer Patients

Document Type : Original Article(s)

Authors

Taha I. Hewala ¹

Mohamed A. Fahmy ²

Sanaa A. El-Benhawy ¹

Hany M. Ammar ²^{, 3}

¹ Radiation Sciences Department, Medical Research Institute, Alexandria University, Alexandria, Egypt

² Department of Radiation Therapy, Children Cancer Hospital 57357, Cairo, Egypt

³ Clinical Oncology Department, Faculty of Medicine, University of Aswan, Aswan, Egypt

https://doi.org/10.30476/mejc.2023.97547.1866

Abstract

Background: This study aims to evaluate the interchangeability between cone beam computed tomography (CBCT) and the optical surface scanning system (Catalyst) for daily positioning during radiation therapy in head and neck cancer patients.
Method: This study was designed as a prospective observational descriptive study divided into two parts. The first part involved a phantom study using the computerized imaging reference systems (CIRS) child atom phantom. It aimed to detect deviations in patient position across six degrees of freedom (lateral, longitudinal, vertical, rotation, roll, and pitch) using the optical light scanner and Catalyst and compare them with deviations detected by CBCT in the same treatment sessions. The second part included 252 sessions, during which 30 head and neck cancer patients were treated at Children Cancer Hospital 57357, Egypt, using both Catalyst and CBCT for setup treatment positioning.
Results: The differences between CBCT and Catalyst in all six degrees of deviation were not statistically significant (lateral (P = 0.175), longitudinal (P = 0.296), vertical (P = 0.110), rotation (P = 0.936), roll (P = 0.527), and pitch (P = 0.270)).
Conclusion: The optical light scanner system Catalyst is comparable to CBCT. Surface scanning (Catalyst) has proven reliable and feasible for daily patient positioning, with the advantage of avoiding daily exposure to additional radiation.

Keywords

Radiotherapy

Image-Guided

Cone-beam computed tomography

Catalyst

Head and neck neoplasms

Subjects

Cancer Treatment

How to cite this article:

Hewala TI, Fahmy MA, El- Benhawy SA, Ammar HM. Evaluation of the interchangeability of cone beam computed tomography and catalyst for patient positioning in radiotherapy for head and neck cancer patients. Middle East J Cancer. 2024;15(2):128-35. doi:10.30476/mejc.2023.97547.1866.

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