Volume : VII, Issue : XI, November - 2017

ASSESSMENT OF PTV MARGIN IN HEAD AND NECK CANCER: AN INSTITUTIONAL STUDY.

Dr Sumit Goyal, Dr Shikha Dhal, Dr U Suryanarayana, Dr Pooja Nandwani Patel, Dr R. K Vyas

Abstract :

 Introduction:Head and neck cancer radiotherapy usually delivered using IMRT (Intensity Modulated Radiotherapy) technique.EPID (Electronic Portal Imaging Device) and CBCT (Cone Beam Computed Tomography) scan helps in determining systemic and the random positioning deviations for a setup,which may be the base for establishing the specific correction protocol in order to improve setup techniques.

Aims and Objectives:Aim of this retrospective analysis was to assess PTV margin of our institute in head and neck cancer treated using IMRT.

Material and Methods:We have retrospectively assessed seventy head and neck cancer patient who has received IMRT and image verification done using CBCT from June 2016 to December 2016 for the assessment of PTV margin of our institute. Shifts along X–axis, Y axis and Z–axis obtained by matching with reference image was noted.

RESULTS:Out of seventy patients eleven (11/70) were female and rest all (59/70) were male patients. Total 367 CBCT were taken among seventy patients.

Systemic Errors (SE) were 0.18, 0.15 and 0.15 cm along X–axis, Y–axis and Z–axis respectively. Random Errors (RE) were 0.13, 0.12 and 0.12 cm along X–axis, Y–axis and Z–axis respectively.

PTV margin calculated using Van Herk’s margin recipe (2.5SE+0.7RE) were 0.541, 0.466 and 0.459 cm along X–axis, Y–axis and Z–axis respectively. The empirical PTV margin given was 5mm and from our study also it was within 5mm.

CONCLUSION: PTV margin obtained were comparative to different studies done all over world and now further trying to reduce it to 3mm by doing daily onboard imaging.

Keywords :

Article: Download PDF   DOI : 10.36106/ijar  

Cite This Article:

Dr Sumit Goyal, Dr Shikha Dhal, Dr U Suryanarayana, Dr Pooja Nandwani Patel, Dr R.K Vyas, ASSESSMENT OF PTV MARGIN IN HEAD AND NECK CANCER: AN INSTITUTIONAL STUDY., INDIAN JOURNAL OF APPLIED RESEARCH : Volume-7 | Issue-11 | November-2017


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