Verification of MLC based real-time tumor tracking using an electronic portal imaging device.

Medical Physics
Sarah Han-OhCedric Yu

Abstract

The authors have developed a novel technique using an electronic portal imaging device (EPID) to verify the geometrical accuracy of delivery of dose-rate-regulated tracking (DRRT). This technique, called verification of real-time tracking with EPID (VORTE), can potentially be used for both on-line and off-line quality assurance (QA) of MLC-based dynamic tumor tracking. The shape and position of target as a function of time, which is assumed to be known, is projected onto the EPID plane. This projected sequence of apertures as a function of time (target motion) is then used as the reference. The accuracy of dynamic MLC tracking can then be assessed by how well the delivered beam follows this projected target motion without the use of a physical moving phantom. The beam apertures controlled by DRRT (aperture motion) is detected by the EPID as a function of time. The aperture motion is compared to the target motion to evaluate tracking error introduced by DRRT. The accuracy of VORTE was measured using film measurements of ten static fields. The VORTE for dynamic tumor tracking was tested with several target motions, including (1) rigid-body two-dimensional (2-D) cyclic motion in the superior-inferior direction with various period ...Continue Reading

References

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Jan 17, 2009·International Journal of Radiation Oncology, Biology, Physics·Sarah Han-OhCedric Yu
Jan 30, 2009·Medical Physics·Sonja DieterichPaul Keall
Apr 22, 2009·Medical Physics·Christopher LeePeter B Greer

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