Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.meddos.2009.06.007
Title: Anatomic and dosimetric changes during the treatment course of intensity-modulated radiotherapy for locally advanced nasopharyngeal carcinoma
Authors: Wang, X.
Lu, J. 
Xiong, X.
Zhu, G.
Ying, H.
He, S.
Hu, W.
Hu, C.
Keywords: Anatomic changes
IMRT
Nasopharyngeal carcinoma
Radiotherapy planning
Issue Date: 2010
Source: Wang, X., Lu, J., Xiong, X., Zhu, G., Ying, H., He, S., Hu, W., Hu, C. (2010). Anatomic and dosimetric changes during the treatment course of intensity-modulated radiotherapy for locally advanced nasopharyngeal carcinoma. Medical Dosimetry 35 (2) : 151-157. ScholarBank@NUS Repository. https://doi.org/10.1016/j.meddos.2009.06.007
Abstract: Many patients with nasopharyngeal carcinoma (NPC) have marked anatomic change during intensity-modulated radiation therapy (IMRT). In this study, the magnitude of anatomic changes and its dosimetric effects were quantified. Fifteen patients with locally advanced NPC treated with IMRT had repeated computed tomography (CT) after 18 fractions. A hybrid plan was made to the anatomy of the second computed tomography scan. The dose of the original plan, hybrid plan, and new plan were compared. The mean volume of left and right parotid decreased 6.19 mL and 6.44 mL, respectively. The transverse diameters of the upper bound of odontoid process, the center of odontoid process, and the center of C2 vertebral body slices contracted with the mean contraction of 8.2 mm, 9.4 mm, and 7.6 mm. Comparing the hybrid plan with the treatment plan, the coverage of target was maintained while the maximum dose to the brain stem and spinal cord increased by 0.08 to 6.51 Gy and 0.05 to 7.8 Gy. The mean dose to left and right parotid increased by 2.97 Gy and 2.57 Gy, respectively. A new plan reduced the dose of spinal cord, brain stem, and parotids. Measurable anatomic changes occurring during the IMRT for locally advanced NPC maintained the coverage of targets but increased the dose to critical organs. Those patients might benefit from replanning. © 2010 American Association of Medical Dosimetrists.
Source Title: Medical Dosimetry
URI: http://scholarbank.nus.edu.sg/handle/10635/26772
ISSN: 09583947
DOI: 10.1016/j.meddos.2009.06.007
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