Figure 8.

Images of an ACR phantom with AC (first and third rows) and NC (second and fourth rows) using 6.5-mm pixel size as recommended in the ASNC guidelines for cardiac SPECT.23 AC corrected the bowing artifact due to attenuation (central region of a uniform region appeared dimmer than the outer region as was shown in the NC image). Note that the phantom had a diameter of 20 cm that was of the same size of the detector for emission scans. When fan beam geometry was used, the emission image was slightly truncated (partial truncation rings shown in the images). Scatter correction was not performed for either AC or NC