![]() ![]() ![]() Tracking was performed with five patient-measured prostate trajectories that represented characteristic prostate motion patterns. The MLC aperture was then adapted to the estimated 3D target position. During treatment, each kV image was first used together with all previous images to estimate the three-dimensional (3D) target probability density function and then used together with this probability density function to estimate the 3D target position. in 20 sec with continuous imaging preceded the treatment. A pretreatment gantry rotation of 120 deg. gantry rotation was delivered to a motion phantom with a fiducial marker under continuous kV X-ray imaging at 5 Hz, perpendicular to the treatment beam. Methods and Materials: An arc field with a circular aperture and 358 deg. Purpose: To implement a method for real-time prostate motion estimation with a single kV imager during arc radiotherapy and to integrate it with dynamic multileaf collimator (DMLC) target tracking. ![]()
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