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The capillary resolution-phantom shows that the registration does not mismatch more than the smallest capillaries visible in SPECT. The capillary diameters in the six different segments are 0.35, 0.40, 0.45, 0.50, 0.60, and 0.75 mm for mouse imaging and 0.7, 0.8, 0.9, 1.0, 1.2, and 1.5 mm for rat imaging. (a) SPECT imaging with the mouse collimator, (b) SPECT imaging with the rat collimator. Top row: CT image, middle row: SPECT image, and bottom row: fused SPECT-CT image.
