Utilization of Electronic Portal Imaging Device (EPID) For Setup Verification and Determination of Setup Margin in Head and Neck Radiation Therapy

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Vejdani Noghreiyan Vajiheh; NASERI SHAHROKH; MOMENNEZHAD MEHDI

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Journal Paper

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Journal: Iranian Journal of Medical Physics Year:2020 | Volume:17 | Issue:3 Page(s): 197-204

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Title

Utilization of Electronic Portal Imaging Device (EPID) For Setup Verification and Determination of Setup Margin in Head and Neck Radiation Therapy

Author(s)

Vejdani Noghreiyan Vajiheh | NASERI SHAHROKH | MOMENNEZHAD MEHDI | Issue Writer Certificate

Keywords

Image Guided Systematic Errors Random Errors Cancer of Head and Neck CTV To PTV Margin

Abstract

Introduction: Radiation therapy involves a multistep procedure; therefore, the error in patient set up is an inherent part of the treatment. Main purpose of this study was to determine the clinical target volume (CTV) to planning target volume (PTV) in head and neck cancer patients. Material and Methods: A total of 15 patients who had daily portal images during the treatment courses were randomly selected in the present study. Systematic (Σ ) and random (σ ) errors were evaluated in three directions. The Isogray treatment planning system and Elekta linear accelerator were used in this study. Moreover, we had used MOSIAQ software as a record and Verify system. Setup margins were calculated using three published margin recipes, including the International Commission on Radiation Units and Measurements (ICRU) report 62, as well as Stroom’ s and van Herk’ s formulae. Results: Average magnitude of the translational errors was reported between 0. 7 and 10 mm. The systematic and random errors for head and neck cancer patients were 3. 55 (2. 58-4. 52) and 1. 83 (1. 56-2. 10) mm, respectively. According to the ICRU report 62, as well as Stoorm’ s and van Herk’ s formulas, the required margins to cover the target were obtained within the ranges of 3. 1-4. 9, 6. 4-10. 5, and 7. 7-12. 7 mm, respectively. Conclusion: According to the results of the present study, 6. 5-10. 5 mm extension in CTV to PTV margin can ensure that 90% of the head and neck cancer patients will receive a minimum cumulative CTV dose higher than or equal to 95% of the prescribed dose.

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APA: Copy

Vejdani Noghreiyan, Vajiheh, NASERI, SHAHROKH, & MOMENNEZHAD, MEHDI. (2020). Utilization of Electronic Portal Imaging Device (EPID) For Setup Verification and Determination of Setup Margin in Head and Neck Radiation Therapy. IRANIAN JOURNAL OF MEDICAL PHYSICS, 17(3), 197-204. SID. https://sid.ir/paper/777426/en

Vancouver: Copy

Vejdani Noghreiyan Vajiheh, NASERI SHAHROKH, MOMENNEZHAD MEHDI. Utilization of Electronic Portal Imaging Device (EPID) For Setup Verification and Determination of Setup Margin in Head and Neck Radiation Therapy. IRANIAN JOURNAL OF MEDICAL PHYSICS[Internet]. 2020;17(3):197-204. Available from: https://sid.ir/paper/777426/en

IEEE: Copy

Vajiheh Vejdani Noghreiyan, SHAHROKH NASERI, and MEHDI MOMENNEZHAD, “Utilization of Electronic Portal Imaging Device (EPID) For Setup Verification and Determination of Setup Margin in Head and Neck Radiation Therapy,” IRANIAN JOURNAL OF MEDICAL PHYSICS, vol. 17, no. 3, pp. 197–204, 2020, [Online]. Available: https://sid.ir/paper/777426/en

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