Modeling the Varian On-Board Imager (OBI)

Cone-beam CT (CBCT) operating modes

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Cone-beam CT (CBCT) imaging is heavily being utilized in radiotherapy treatment as means of treating cancer patients. One of the platforms is the Varian On-Board Imager (oBI) where kilo-volts (kV) CBCT imaging is used. In this study, a model of the OBI is developed to simulate the two scan modes that are available, namely: Full-Fan (FF) and Half-Fan (HF) modes. By shifting the same set of 1024×768 detector panels laterally, a larger field-of-view (FOV) is achieved in the HF scan mode. Using a realistic XCAT phantom, the different FOVs are simulated using analytical Feldkamp-Davis-Kress (FDK) and iterative Simultaneous Algebraic Reconstruction Technique (SART) reconstruction methods. As suggested in literatures, ring and radiant artifacts can occur in the HF mode due to its geometry. To implement fast analytical method, an adequate weight factor needs to be applied on the projection data prior to reconstruction. The percentage normalized root mean squared error (NRMSE) value for FF and HF using analytical FDK reconstruction are 7.12% and 16.63% respectively. Using the iterative SART, the respective values are and 2.69% and 4.65%. The simulation model of the Varian OBI: CBCT operating mode is expected to encourage and enhance further studies on image guided radiation therapy (IGRT) during radiotherapy treatment delivery.

Original languageEnglish
Title of host publicationProceedings of the 2017 IEEE International Conference on Signal and Image Processing Applications, ICSIPA 2017
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages117-122
Number of pages6
ISBN (Electronic)9781509055593
DOIs
Publication statusPublished - 1 Jan 2017
Event5th IEEE International Conference on Signal and Image Processing Applications, ICSIPA 2017 - Kuching, Sarawak, Malaysia
Duration: 12 Sep 201714 Sep 2017

Other

Other5th IEEE International Conference on Signal and Image Processing Applications, ICSIPA 2017
CountryMalaysia
CityKuching, Sarawak
Period12/9/1714/9/17

Fingerprint

Image sensors
Fans
Cones
Radiotherapy
Imaging techniques
Detectors
Geometry

Keywords

  • Cone-Beam CT
  • FDK
  • image reconstruction
  • Modeling
  • SART
  • Varían On-Board Imager

ASJC Scopus subject areas

  • Computer Science Applications
  • Computer Vision and Pattern Recognition
  • Signal Processing

Cite this

Amin, A. T. M., Abd Rahni, A. A., Mokri, S. S., & Ahmad, R. (2017). Modeling the Varian On-Board Imager (OBI): Cone-beam CT (CBCT) operating modes. In Proceedings of the 2017 IEEE International Conference on Signal and Image Processing Applications, ICSIPA 2017 (pp. 117-122). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ICSIPA.2017.8120590

Modeling the Varian On-Board Imager (OBI) : Cone-beam CT (CBCT) operating modes. / Amin, Adam Tan Mohd; Abd Rahni, Ashrani Aizzuddin; Mokri, Siti Salasiah; Ahmad, Rozilawati.

Proceedings of the 2017 IEEE International Conference on Signal and Image Processing Applications, ICSIPA 2017. Institute of Electrical and Electronics Engineers Inc., 2017. p. 117-122.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Amin, ATM, Abd Rahni, AA, Mokri, SS & Ahmad, R 2017, Modeling the Varian On-Board Imager (OBI): Cone-beam CT (CBCT) operating modes. in Proceedings of the 2017 IEEE International Conference on Signal and Image Processing Applications, ICSIPA 2017. Institute of Electrical and Electronics Engineers Inc., pp. 117-122, 5th IEEE International Conference on Signal and Image Processing Applications, ICSIPA 2017, Kuching, Sarawak, Malaysia, 12/9/17. https://doi.org/10.1109/ICSIPA.2017.8120590
Amin ATM, Abd Rahni AA, Mokri SS, Ahmad R. Modeling the Varian On-Board Imager (OBI): Cone-beam CT (CBCT) operating modes. In Proceedings of the 2017 IEEE International Conference on Signal and Image Processing Applications, ICSIPA 2017. Institute of Electrical and Electronics Engineers Inc. 2017. p. 117-122 https://doi.org/10.1109/ICSIPA.2017.8120590
Amin, Adam Tan Mohd ; Abd Rahni, Ashrani Aizzuddin ; Mokri, Siti Salasiah ; Ahmad, Rozilawati. / Modeling the Varian On-Board Imager (OBI) : Cone-beam CT (CBCT) operating modes. Proceedings of the 2017 IEEE International Conference on Signal and Image Processing Applications, ICSIPA 2017. Institute of Electrical and Electronics Engineers Inc., 2017. pp. 117-122
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abstract = "Cone-beam CT (CBCT) imaging is heavily being utilized in radiotherapy treatment as means of treating cancer patients. One of the platforms is the Varian On-Board Imager (oBI) where kilo-volts (kV) CBCT imaging is used. In this study, a model of the OBI is developed to simulate the two scan modes that are available, namely: Full-Fan (FF) and Half-Fan (HF) modes. By shifting the same set of 1024×768 detector panels laterally, a larger field-of-view (FOV) is achieved in the HF scan mode. Using a realistic XCAT phantom, the different FOVs are simulated using analytical Feldkamp-Davis-Kress (FDK) and iterative Simultaneous Algebraic Reconstruction Technique (SART) reconstruction methods. As suggested in literatures, ring and radiant artifacts can occur in the HF mode due to its geometry. To implement fast analytical method, an adequate weight factor needs to be applied on the projection data prior to reconstruction. The percentage normalized root mean squared error (NRMSE) value for FF and HF using analytical FDK reconstruction are 7.12{\%} and 16.63{\%} respectively. Using the iterative SART, the respective values are and 2.69{\%} and 4.65{\%}. The simulation model of the Varian OBI: CBCT operating mode is expected to encourage and enhance further studies on image guided radiation therapy (IGRT) during radiotherapy treatment delivery.",
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