An EPID based method for performing high accuracy calibration between an optical external marker tracking device and the LINAC reference frame.

Medical Physics
Zachary GrelewiczR D Wiersma

Abstract

With the increasing use of external 3D optical tracking cameras to guide modern radiation therapy procedures, it has become vitally important to have an accurate camera to linear accelerator (LINAC) reference frame calibration. To eliminate errors present in current calibration procedures based on the manual hand alignment of a device using the light field crosshairs and in room guidance lasers, a semiautomated quantitative calibration approach requiring only use of an electronic portal imaging device (EPID) was developed. A phantom comprised of seven highly IR reflective plastic BBs was placed on the LINAC treatment couch and imaged with both a 3D stereoscopic IR imager and the on board megavoltage (MV) EPID imager. Having knowledge of the optically determined 3D positions and projected EPID images of the BBs, simulated annealing was used to optimize the location of the BBs in the LINAC frame using four different optimization functions. Singular value decomposition was then used to calculate the transformation matrix between the camera and LINAC reference frames. Results were then compared to a traditional camera calibration method for overall accuracy. Using modeled data, the simulated annealing process was able to determine ...Continue Reading

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Citations

Dec 5, 2014·Medical Physics·Andrew H BelcherRodney D Wiersma
Jun 10, 2016·Medical Physics·Andrew H BelcherRodney D Wiersma
Nov 14, 2017·Physics in Medicine and Biology·Andrew H BelcherRodney D Wiersma

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