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Fig. 1A —Chest phantom study. As CT of phantom shows, inside of phantom
contains two round water-filled nodules of 24 and 8 mm (arrows, a).
With increases in number of continuous rotating repeated acquisition (CRRA)
mode projection data sets for reconstructing SPECT of standing phantom,
perfusion defects of these nodules becomes more distinct (arrows,
b). SPECT reconstructed from eight continuous rotating repeated
acquisition mode projection data (b; n = 8) has good image quality,
as does SPECT (arrow, c) obtained with step-and-shoot mode and total
acquisition time of 8 minutes. Perfusion defect of small 8-mm nodule on this
SPECT is clearer compared with that on SPECT (arrow, d) of moving
phantom (moving in head-to-caudal direction with range of 12 mm at frequency
of 15 times/min) obtained using step-and-shoot mode and with total acquisition
time of 8 minutes (d). R = right.
