Journal of Medical Physics
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TECHNICAL NOTE
Year : 2018  |  Volume : 43  |  Issue : 1  |  Page : 52-57

Dosimetric effect of jaw tracking in volumetric-modulated arc therapy


Department of Radiation Oncology, Chulabhorn Hospital, Bangkok, Thailand

Correspondence Address:
Dr. Sangutid Thongsawad
Department of Radiation Oncology, Chulabhorn Hospital, 54 Kamphaengphet 6 Road, Laksi, Bangkok 10210
Thailand
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/jmp.JMP_75_17

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The aim of this study was to investigate the potential of jaw tracking with the volumetric-modulated arc therapy (VMAT) to reduce the normal tissue dose. Plans of nasopharynx, lung, and prostate cancers (10 plans for each) were used to perform VMAT with and without jaw tracking. The dose reduction was evaluated in terms of organ doses and integral doses. Organ-dose reduction with jaw tracking was statistically significant in the volume receiving a dose of 5 Gy (V5) of bladder, rectum, and lung, the volume receiving a dose of 10 Gy (V10) of bladder, rectum, and lung, and the mean dose of lung (P < 0.05). Integral-dose reduction with jaw tracking was statistically significant in almost all the treatment plans (P < 0.05). For organ-dose reduction, jaw tracking in VMAT plan was effective in reducing V5and V10. For integral-dose reduction, jaw tracking in VMAT plan is an efficient method for decreasing V5.


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