Dosimetric evaluation of patient setup errors due to uncertainties during IMRT for head and neck cancer cases
Background: IMRT become popular because dose escalation to the target can be done while sparing adjacent normal tissues. Intensity-modulated radiation therapy tends to produce steep absorbed-dose gradients between the target volume and the OAR. This study was done to determine the error during RT on positioning displacement for patients treated for head and neck cancer. We tried to find the magnitude of daily setup errors to determine the set up error cases. The results can help physicians to determine the most suitable margin for head and neck cases. Results: Data from 20 patients calculated. The Right/Left direction as X direction, Anterior/Posterior direction as Y shift and Up/Down direction as Z shift. Average shift for all fractions calculated to be 0.05 cm, 0.08 cm and -0.02 cm as RT/LT, Ant/Post and Up/Down shifts. Conclusions: To reduce setup errors in patients with H&N cancer receiving RT. The use of on-line image-guided radiotherapy is recommended to increase accuracy.
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Submitted PhD thesis in Biotechnology at GITAM University, Vizag.
The Past Head, General Administration of Pharmaceutical Care at Ministry of Health,
Saudi Arabia Critical Care/TPN
Clinical Pharmacist Ministry of Health,
Riyadh, Saudi Arabia.
Department of Radiation Oncology
Asahi University Hospital
Gifu city, Gifu, Japan
Maher Abdel Fattah Al-Shayeb
Department of Surgical Sciences, Ajman University, UAE
Institute of Gynecology and Obstetrics, Medical University of Lodz, I Clinic of Gynecology and Gynecological Oncology (Lodz, Poland)
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