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Table 1 Quantitative errors and relative changes of VOI activities

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

Isotope VOI Quantitative error 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 0 mm 0 mm 0 mm 3 mm X
    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 1 −20.4 0.1 0.4 −0.5 −4.0 0.0 −4.9 5.2 5.3
2 −11.8 0.7 1.1 −0.2 −1.0 −0.2 −4.8 5.0 6.2
3 −7.9 −1.1 −4.0 −1.5 −4.5 −1.4 −4.2 4.3 −0.8
201Tl 1 −5.8 0.0 0.1 −0.1 −1.5 0.0 −2.6 2.7 2.7
2 6.1 −0.4 −1.4 0.0 −0.3 −0.1 −2.5 2.6 3.0
3 4.4 0.2 −0.3 0.6 1.4 −0.7 −2.3 2.3 0.0
99mTc 1 −2.0 0.1 0.2 −0.2 −1.7 0.0 −2.2 2.2 2.1
2 6.1 −0.3 −1.1 −0.1 −0.3 −0.1 −2.1 2.2 2.4
3 −8.3 0.4 −0.2 0.5 1.3 −0.2 −1.8 1.9 0.2
111In 1 −4.7 0.0 0.1 −0.2 −1.4 0.0 −2.1 2.1 2.2
2 −3.5 −0.4 −1.2 0.0 −0.3 −0.1 −2.0 2.0 2.5
3 3.2 0.0 −1.1 0.4 0.9 −0.9 −1.9 1.9 0.6
  1. Quantitative errors (in %) of VOI activities in reference phantom SPECT images were calculated with respect to dose calibrator measurements (1st data column), and relative changes (in %) in VOI activities due to attenuation map inaccuracies were calculated with respect to reference images (2nd to 9th data column).