Bahador M, Soltani Nejad S, Yazdani S. The absorbed dose of the thyroid among patients with breast cancer following irradiation to the supraclavicular field. Int J Radiat Res 2025; 23 (3) :819-822
URL:
http://ijrr.com/article-1-6684-en.html
Department of Medical Physics, Afzalipour Hospital, Kerman University of Medical Sciences, Kerman, Iran , yazdani_ph70@yahoo.com
Abstract: (33 Views)
Background: The aim of this study was to determine the radiation dose to the thyroid and spinal cord using different gantry angles for the supraclavicular field in breast cancer patients. Materials and Methods: Fifty patients treated with opposing tangential fields for chest wall and ipsilateral supraclavicular (SCV) field were enrolled. On the planning computed tomography (CT) scans of patients receiving 50 Gray (Gy) of radiation in daily fractions of 2 Gy, the volumes of the thyroid, spinal cord, and supraclavicular (SCV) nodes were contoured. A comparison of the dosimetric parameters between three different gantry angles (0°, 5°, and 10°) of the SCV field was performed. Moreover, the percentage volumes of absorbed dose by the thyroid at low (V15) and high (V45) doses were compared. The maximum dose to the spinal cord was also compared between the angles. Results: Differences between mean dose (Dmean) of thyroid, spinal cord, V15, and V45 values using different gantry angles were statistically significant (p <0.05). When the gantry angle increased, the Dmean of the thyroid and spinal cord significantly decreased. Conclusions: Gantry angle adjustment can reduce the dose to the thyroid. Therefore, contouring the thyroid as an organ at risk and utilizing an appropriate gantry angle during radiation is beneficial in minimizing the dose received by the thyroid. Nevertheless, the dose distribution of SCV lymph nodes and SCV field should be considered.
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