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Fig. 4 | EJNMMI Physics

Fig. 4

From: Towards accurate 177Lu SPECT activity quantification and standardization using lesion-to-background voxel ratio

Fig. 4

CF values in cps/MBq versus SBVR calibration curves for the 26.52 (red curve), 11.49 (blue curve) and 5.71 cc (purple curve) spheres. The CFs data obtained from several NEMA Cal. 2 acquisitions (dots) were interpolated using a simple a linear regression fit. The “cold background” points were obtained from the point of intersection between the linear curve and the cold background CF value for each of the three spheres. The cold background CF value represents the maximum value of the CF for every sphere. The horizontal gray dashed line with a value of 4.87 represents the background CF for large volumes

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