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Table 3 Average absolute quantitative errors and average absolute changes of source activities

From: Effects of attenuation map accuracy on attenuation-corrected micro-SPECT images

Isotope Quantitative error a Changes induced by map inaccuracies (rotation, shift and/or μ change) with respect to references
15° 15°
1 mm X 3 mm X 1 mm Y 3 mm Y 1 mm Z 3 mm Z 0 mm 0 mm 0 mm 3 mm X
   1.0 μ 1.0 μ 1.0 μ 1.0 μ 1.0 μ 1.0 μ 1.0 μ 0.9 μ 1.1 μ 1.1 μ
125I 2.1 ± 6.5 1.5 ± 1.1 3.9 ± 3.1 1.6 ± 1.2 4.6 ± 3.3 0.9 ± 0.9 2.3 ± 1.9 2.1 ± 1.8 5.8 ± 1.7 6.1 ± 1.9 5.8 ± 5.4
201Tl 3.3 ± 2.5 0.6 ± 0.6 1.7 ± 1.6 0.6 ± 0.4 1.5 ± 1.2 0.5 ± 0.5 1.2 ± 0.8 0.8 ± 0.8 3.2 ± 0.8 3.3 ± 0.9 4.4 ± 3.2
99mTc 2.0 ± 2.5 0.6 ± 0.5 1.5 ± 1.4 0.4 ± 0.4 1.0 ± 1.0 0.5 ± 0.4 1.3 ± 1.2 0.5 ± 0.4 2.8 ± 0.6 2.9 ± 0.7 3.3 ± 2.2
111In 2.0 ± 2.7 0.6 ± 0.4 1.6 ± 1.3 0.4 ± 0.3 1.2 ± 0.8 0.3 ± 0.4 0.8 ± 1.0 0.5 ± 0.8 2.7 ± 0.6 2.8 ± 0.6 3.9 ± 2.2
  1. Average absolute quantitative errors (in %) of source activities in reference rat SPECT images were calculated with respect to dose calibrator measurements (1st data column), and average absolute changes (in %) in source activities due to attenuation map inaccuracies were calculated with respect to reference images (2nd to 11th data column). aObtained from [16].