Technical Innovations and Patient Support in Radiation Oncology

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Technical Innovations and Patient Support in Radiation Oncology A photographic technique for quick assessment of mechanical isocenter of a linear accelerator Janne Heikkilä, Jan Seppälä, Jouni Nuutinen, Antti Vanne, Tapani Lahtinen Technical Innovations and Patient Support in Radiation Oncology Volume 2, Pages 1-4 (June 2017) DOI: 10.1016/j.tipsro.2017.03.001 Copyright © 2017 The Authors Terms and Conditions

Fig. 1 (a) An example of the imaging setup with gantry angle 0° and couch rotation 90°. Modified front pointer is the imaging object. Tip of the front pointer is a plastic ball with a diameter of 12mm. (b) Coordinate directions (x, y, and z) used in the image analysis and results. Technical Innovations and Patient Support in Radiation Oncology 2017 2, 1-4DOI: (10.1016/j.tipsro.2017.03.001) Copyright © 2017 The Authors Terms and Conditions

Fig. 2 Measured displacements as a function of micrometer position with the linear fit to the measurements. Displacements were analyzed in pixel space and converted to millimeters using the size of the ball as a reference (1 pixel=0.032mm). Technical Innovations and Patient Support in Radiation Oncology 2017 2, 1-4DOI: (10.1016/j.tipsro.2017.03.001) Copyright © 2017 The Authors Terms and Conditions

Fig. 3 (a) Measured front pointer ball locations for different gantry and collimator rotations. (b) Isocenter surface that covers the measured front pointer ball locations. In both figures, the asterisk mark (*) is used for the assumed isocenter (i.e. positioning lasers points the middle of the front pointer ball when the gantry and collimator angles are 0°). Technical Innovations and Patient Support in Radiation Oncology 2017 2, 1-4DOI: (10.1016/j.tipsro.2017.03.001) Copyright © 2017 The Authors Terms and Conditions

Fig. 4 Measured displacements of the front pointer ball in x-, y-, and z-directions and in xz- and yz-planes when only the gantry was rotated and the collimator angle was 0°. For y-displacement the gantry angles between 180° and 315° are missing because the couch prevents gantry rotation at these angles. Technical Innovations and Patient Support in Radiation Oncology 2017 2, 1-4DOI: (10.1016/j.tipsro.2017.03.001) Copyright © 2017 The Authors Terms and Conditions