Automatic marker detection and 3D position reconstruction using cine EPID images for SBRT verification

Medical Physics
Sang-June ParkRoss I Berbeco

Abstract

In previous studies, an electronic portal imaging device (EPID) in cine mode was used for validating respiratory gating and stereotactic body radiation therapy (SBRT) by tracking implanted fiducials. The manual marker tracking methods that were used were time and labor intensive, limiting the utility of the validation. The authors have developed an automatic algorithm to quickly and accurately extract the markers in EPID images and reconstruct their 3D positions. Studies have been performed with gold fiducials placed in solid water and dynamic thorax phantoms. In addition, the authors have examined the cases of five patients being treated under an SBRT protocol for hepatic metastases. For each case, a sequence of images was created by collecting the exit radiation using the EPID. The markers were detected and recognized using an image processing algorithm based on the Laplacian of Gaussian function. To reduce false marker detection, a marker registration technique was applied using image intensity as well as the geometric spatial transformations between the reference marker positions produced from the projection of 3D CT images and the estimated marker positions. An average marker position in 3D was reconstructed by backproject...Continue Reading

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Citations

Mar 3, 2011·Medical Physics·M AristophanousR I Berbeco
Aug 6, 2011·Medical Physics·Yong YueRoss I Berbeco
Dec 5, 2014·Medical Physics·Jonathan H BryantRoss I Berbeco
Dec 4, 2015·Medical Physics·Stephen S F YipRoss I Berbeco
May 13, 2015·International Journal of Radiation Oncology, Biology, Physics·Manuela BurgheleaMark de Ridder
Nov 19, 2013·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Kenneth PoelsMark De Ridder
Jun 28, 2018·Journal of Applied Clinical Medical Physics·Tianjun MaLalith K Kumaraswamy
Sep 3, 2010·Physics in Medicine and Biology·J RottmannR Berbeco
Dec 4, 2010·Bioinformatics·António dos AnjosHamid R Shahbazkia
Oct 4, 2012·Physics in Medicine and Biology·Mette K StamBas W Raaymakers
Apr 14, 2016·Journal of Applied Clinical Medical Physics·Margie A HuntPengpeng Zhang
Jul 8, 2021·Physics in Medicine and Biology·T C HarrisR I Berbeco

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