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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).