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223Ra-dichloride therapy of bone metastasis: optimization of SPECT images for quantification

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Figure

Fig. 1 Example of an axial slice of a reconstructed image of the NEMA phantom merged with the CT, showing the ROIs corresponding to thehot spheres, as well as the 37-mm-diameter background ROIs
Fig. 2 Picture of the TORSO phantom (lateral view) containing two spheres of 0.5 ml and 5.6 ml (indicated with red arrows) inside the cylindricalinsert and another sphere of 5.6 ml fixed on it (indicated with a blue arrow)
Table 1 Spatial resolutions measured on the reconstructed images obtained with the 85 keV ± 20% energy window and on the sumof the images obtained with each energy window (85 keV ± 20%, 154 keV ± 10%, 270 keV ± 10%)
Fig. 4 Number of measured counts (a), sensitivity (b), number of counts measured in the background (c), and signal-to-noise ratio (d) plottedagainst iteration number with the ROI fixed at 5.6 ml
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