A positioning QA procedure for 2D/2D (kV/MV) and 3D/3D (CT/CBCT) image matching for radiotherapy patient setup.

Journal of Applied Clinical Medical Physics
Huaiqun GuanFang-Fang Yin

Abstract

A positioning QA procedure for Varian's 2D/2D (kV/MV) and 3D/3D (planCT/CBCT) matching was developed. The procedure was to check: (1) the coincidence of on-board imager (OBI), portal imager (PI), and cone beam CT (CBCT)'s isocenters (digital graticules) to a linac's isocenter (to a pre-specified accuracy); (2) that the positioning difference detected by 2D/2D (kV/MV) and 3D/3D(planCT/CBCT) matching can be reliably transferred to couch motion. A cube phantom with a 2 mm metal ball (bb) at the center was used. The bb was used to define the isocenter. Two additional bbs were placed on two phantom surfaces in order to define a spatial location of 1.5 cm anterior, 1.5 cm inferior, and 1.5 cm right from the isocenter. An axial scan of the phantom was acquired from a multislice CT simulator. The phantom was set at the linac's isocenter (lasers); either AP MV/R Lat kV images or CBCT images were taken for 2D/2D or 3D/3D matching, respectively. For 2D/2D, the accuracy of each device's isocenter was obtained by checking the distance between the central bb and the digital graticule. Then the central bb in orthogonal DRRs was manually moved to overlay to the off-axis bbs in kV/MV images. For 3D/3D, CBCT was first matched to planCT to check ...Continue Reading

References

Dec 13, 2006·Medical Physics·Sua YooPeter Munro
Oct 2, 2007·Seminars in Radiation Oncology·Jean-Pierre Bissonnette
May 24, 2008·International Journal of Radiation Oncology, Biology, Physics·Jean-Pierre BissonnetteDavid A Jaffray
Jun 20, 2008·Medical Physics·Jean-Pierre BissonnetteDavid A Jaffray
Feb 19, 2009·Journal of Applied Clinical Medical Physics·Eduard SchreibmannTim Fox

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Citations

Mar 14, 2014·Practical Radiation Oncology·Matthew W SuttonKenneth R Hogstrom
Sep 8, 2016·Reports of Practical Oncology and Radiotherapy : Journal of Greatpoland Cancer Center in Poznań and Polish Society of Radiation Oncology·Andrej StrojnikPrimož Peterlin
Oct 3, 2015·Medical Physics·Baozhou SunSasa Mutic
Jun 4, 2016·Journal of X-ray Science and Technology·Han ZhouYongjian Wang
Apr 12, 2016·Journal of X-ray Science and Technology·Jun LiLei Chai
Sep 8, 2012·Journal of Applied Clinical Medical Physics·Stephen F KryNathan L Childress
Jun 24, 2015·Journal of Applied Clinical Medical Physics·Travis R DentonAaron C Spalding
Jul 10, 2018·Journal of Applied Clinical Medical Physics·Kwang-Ho CheongHoonsik Bae

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Methods Mentioned

BETA
imaging techniques

Software Mentioned

Varian
OBI1
Eclipse

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