Vol.:(0123456789) 1 3 La radiologia medica https://doi.org/10.1007/s11547-020-01259-y RADIOTHERAPY A technique for quantifying the sensitivity of dosimetric tool gamma with 2D detector array in pretreatment IMRT plans by segment deletion method M. P. Arun Krishnan 1,2  · A. T. Bhagyalakshmi 1  · Raghavendra Holla 3  · Niyas Puzakkal 2  · C. P. Ranjith 2  · R. Vysakh 2  · M. P. Irfad 2  · V. Ramasubramanian 1  · Jianping Hu 1  · M. Ummal Momeen 1 Received: 10 April 2020 / Accepted: 10 August 2020 © Italian Society of Medical Radiology 2020 Abstract Objectives Motivation of this study is to check the sensitivity of dosimetric tool gamma with 2D detector array combina- tion when unexpected errors occur while transferring intensity-modulated radiation therapy treatment plans from planning system to treatment unit. Methods This study consists of 17 head and neck cancer patient’s treatment plans. Nine types of verification plans are created for all 17 clinically approved treatment plans by consecutively deleting different segments (up to eight) one by one from each field of the plan. Decrement factor (χ) is introduced in our study which illustrated the degree of decay of gamma passing rate when intentional errors are introduced. We analyzed the data by two different methods—one without selecting the region of interest (ROI) in dose distributions and the other by selecting the region of interest. Results By linear regression, the absolute value of slopes is 0.025, 0.024 and 0.015 without ROI and 0.030, 0.027 and 0.015 with ROI for 2%/2 mm, 3%/3 mm and 5%/5 mm criteria, respectively. The higher absolute value of the fitted slope indicates the higher sensitivity of this method to identify erroneous plan in treatment unit. The threshold value for 2%/2 mm equivalent to 95% passing criteria in 3%/3 mm used in clinical practice is obtained as 83.44%. Conclusions The 2D detector array with dosimetric tool gamma is less sensitive in detecting errors when unprecedented errors of segment deletion occur within the treatment plans. Keywords IMRT · Pretreatment quality assurance · Decrement factor · Gamma · Error identification · Passing criterion · Region of interest * Jianping Hu jianpinghu@hotmail.com * M. Ummal Momeen ummalmomeen@gmail.com M. P. Arun Krishnan arunkrishnanmp@gmail.com A. T. Bhagyalakshmi bhagyalakshmiat@gmail.com Raghavendra Holla raghavendra.holla@gmail.com Niyas Puzakkal pniyas@gmail.com C. P. Ranjith ranjithcp007@gmail.com R. Vysakh vysakhraveendran92@gmail.com M. P. Irfad mpirfad@gmail.com V. Ramasubramanian vramasubramanian@vit.ac.in 1 School of Advanced Sciences, Vellore Institute of Technology, Vellore 632014, India 2 MVR Cancer Centre and Research Institute, Kozhikode 673601, India 3 Amrita Institute of Medical Sciences and Research Centre, Kochi 682041, India