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Ratio of VOI calibration factor (cf voi) to true camera sensitivity calibration factor (cf true), as a function of number of voxels in VOI (nVoxels). Data is shown for phantom measurements (blackand green squares) and corresponding calculated values (red circles) (Eq. 7). The plotted standard uncertainties include a ±1 voxel (4.42 mm) uncertainty in positioning the VOIs. Note logarithmic scale on x-axis
