ICTMI 2017 pp 105-114 | Cite as

A Step to In Vivo Dosimetry Using Electronic Portal Imaging Device: Initial Experience

  • Sangaraju Siva KumarEmail author
  • Minu Boban
  • Kaliyaperumal Venkatesan
  • Jomon Raphael
  • Mathew Varghese
  • R. Murali
  • N. Arunai Nambi Raj
Conference paper


Purpose In vivo dosimetry in radiotherapy for advanced treatment techniques is not in a regular clinical procedure. The purpose of the study is to verify the exit dose conformity and consistency for the advanced radiotherapy treatment delivery using electronic portal imaging device (EPID) and to implement in vivo dosimetry using EPID into our regular clinical procedures. Procedures Varian Trilogy linear accelerator attached with amorphous silicon EPID and on-board imager (OBI) having 120-leaf Millennium MLC was used for study. Three static fields and four dynamic multileaf collimator (MLC) fluence fields were planned using 6 MV X-rays for phantom study. We used catphan 500 phantom for our study. Four patients were chosen with intensity-modulated radiotherapy (IMRT) and volumetric arc therapy (VMAT) for in vivo dosimetry. Exit field treatment images were acquired using EPID during treatment in an integration mode. Portal dosimetry workspace was used to analyse and to record the results. Gamma analysis and dose comparison was done for individual fields and composite fields. Results The study shows the point dose comparison at isocentre and line profiles across the fields matched very well, if the treatment set-up was kept accurately and maintained the anatomy. Known shift was introduced into the field and recognized the change in the point dose and line profile dose in the phantom study. The IMRT and VMAT techniques exit field fluence image acquired by EPID shown, consistency in the treatment delivery. Conclusion EPID can be used for our in vivo dosimetry in high-end and complex radiotherapy techniques. This can be used for documenting and recording the treatment delivery of our radiotherapy patients. The results and analysis are comparatively reliable and took less time for acquired image analysis.


Radiotherapy Electronic Portal Imaging Device (EPID) In vivo dosimetry Quality assurance Linear accelerator 


Conflict of Interest

The authors declare that they have no conflict of interest.


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Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  • Sangaraju Siva Kumar
    • 1
    Email author
  • Minu Boban
    • 1
  • Kaliyaperumal Venkatesan
    • 1
  • Jomon Raphael
    • 1
  • Mathew Varghese
    • 1
  • R. Murali
    • 2
  • N. Arunai Nambi Raj
    • 3
  1. 1.Department of Radiation OncologyAmala Institute of Medical SciencesThrissurIndia
  2. 2.Department of Physics, SASVITVelloreIndia
  3. 3.Centre for Biomaterials, Cellular and Molecular TheranosticsVITVelloreIndia

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