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Fig. 2 | Radiation Oncology

Fig. 2

From: Evaluation of transperineal ultrasound imaging as a potential solution for target tracking during hypofractionated radiotherapy for prostate cancer

Fig. 2

a Experimental setup for phantom validation. b A sample MV image with indicated positions of the segmented fiducials (solid blue circles), predicted positions of the fiducials based on ultrasound tracking (hollow blue circles), and predicted positions of the fiducials assuming no motion (green asterisks). c Pixel coordinate (u) of fiducial 1 at different times during the MV arc beam delivery. d Pixel coordinate (v) of fiducial 1 at different times during the MV arc beam delivery. e Difference vectors (scaled at isocenter) between mean predicted and mean actual (MV segmented) positions of the 4 fiducials. f Relative cumulative distribution of the magnitudes of the difference vectors shown in (e)

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