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Japanese Journal of Radiology

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01.09.2013 | Original Article

Is it necessary to repeat CT imaging and replanning during the course of intensity-modulated radiation therapy for locoregionally advanced nasopharyngeal carcinoma?

verfasst von: Chuanben Chen, Xiang Lin, Jianji Pan, Zhaodong Fei, Lisha Chen, Penggang Bai

Erschienen in: Japanese Journal of Radiology | Ausgabe 9/2013

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Abstract

Purpose

Our aim was to evaluate the volumetric and dosimetric changes of target volumes and organs at risk (OARs) during intensity-modulated radiation therapy (IMRT) for locoregionally advanced nasopharyngeal carcinoma (NPC) and the necessity of replanning.

Materials and methods

Twenty locoregionally advanced NPC patients treated by concurrent chemotherapy and IMRT were included. CT and MR images were acquired before treatment and at weeks 2, 3, 4, 5 and 6 during treatment. The target volumes and OARs were contoured based on the fused CT-MRI images and hybrid plans were generated. The changes of volume and dosimetry were measured by comparing original plan and hybrid plans.

Results

Significant volumetric changes of target volumes and parotid gland were observed. The primary nasopharyngeal tumor (GTVnx), CTV1, involved lymph nodes (GTVnd) and left and right parotid glands, shrank at a mean rate of 14.7, 11.56, 11.40, 6.54 and 6.78 % per treatment week, respectively. There were no significant dosimetric changes in GTVnx, GTVnd, CTV1, spinal cord and brain stem while the differences of dose to left and right parotid glands were significant (F = 6.73, P = 0.007; F = 7.43, P = 0.007).

Conclusions

Remarkable volumetric changes were observed. However, the dosimetric changes were inconspicuous except for the parotid. Replanning might contribute to protect the parotid gland.

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Titel: Is it necessary to repeat CT imaging and replanning during the course of intensity-modulated radiation therapy for locoregionally advanced nasopharyngeal carcinoma?
verfasst von: Chuanben Chen
Xiang Lin
Jianji Pan
Zhaodong Fei
Lisha Chen
Penggang Bai
Publikationsdatum: 01.09.2013
Verlag: Springer Japan
Erschienen in: Japanese Journal of Radiology / Ausgabe 9/2013
Print ISSN: 1867-1071
Elektronische ISSN: 1867-108X
DOI: https://doi.org/10.1007/s11604-013-0225-5

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Is it necessary to repeat CT imaging and replanning during the course of intensity-modulated radiation therapy for locoregionally advanced nasopharyngeal carcinoma?

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