Physics and Imaging in Radiation Oncology

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Physics and Imaging in Radiation Oncology Comparison of projection- and image-based methods for proton stopping power estimation using dual energy CT Gloria Vilches-Freixas, Vicki Trier Taasti, Ludvig Paul Muren, Jørgen Breede Baltzer Petersen, Jean Michel Létang, David Christoffer Hansen, Simon Rit Physics and Imaging in Radiation Oncology Volume 3, Pages 28-36 (July 2017) DOI: 10.1016/j.phro.2017.08.001 Copyright © 2017 The Authors Terms and Conditions

Fig. 1 Reference SPR for the four slices used in the comparison. Placement of ROIs are shown by blue circles, three to four ROIs are placed in each slice. (For interpretation of the references to colour in this figure caption, the reader is referred to the web version of this article.) Physics and Imaging in Radiation Oncology 2017 3, 28-36DOI: (10.1016/j.phro.2017.08.001) Copyright © 2017 The Authors Terms and Conditions

Fig. 2 Relative SPR errors for each of the thirteen ROIs (for the placement see Fig. 1). The center squares show the mean of the relative SPR error over the ROI, and the error-bars show the standard error of the mean (SEM). Physics and Imaging in Radiation Oncology 2017 3, 28-36DOI: (10.1016/j.phro.2017.08.001) Copyright © 2017 The Authors Terms and Conditions

Fig. 3 Box-plot of relative range error distribution, as calculated by the Radon transform for each anatomical slice using each of the four SPR estimation methods (PB: Projection-based, IB: Image-based). The boxes show the interquartile (IQ) range, i.e. from the 25%-percentile (Q1) to the 75%-percentile (Q3), and the black dots represent the median. The whiskers go from Q1-2.5×IQ up to Q3+2.5×IQ. The outliers are not shown in the figure, but the percentages (excluding the sinogram entries corresponding to a WEPL of zero) are given in the right side of the figure. Physics and Imaging in Radiation Oncology 2017 3, 28-36DOI: (10.1016/j.phro.2017.08.001) Copyright © 2017 The Authors Terms and Conditions

Fig. A.1 Kanematsu fitting lines to convert from RED to SPR/RED. Physics and Imaging in Radiation Oncology 2017 3, 28-36DOI: (10.1016/j.phro.2017.08.001) Copyright © 2017 The Authors Terms and Conditions