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Table 7 CT image uniformity

From: A NIM PET/CT phantom for evaluating the PET image quality of micro-lesions and the performance parameters of CT

Location

Background

Boundary

Purified water

ROIs

CT value (HU)

ΔCT value (HU)

CT value (HU)

ΔCT value (HU)

CT value (HU)

ΔCT value (HU)

ROI-c

4.51

0

4.51

0

4.51

0

ROI-1

6.1

1.59

6.21

1.7

3.74

0.77

ROI-2

5.15

0.64

5.77

1.26

2.88

1.63

ROI-3

6.46

1.95

4.88

0.37

3.2

1.31

ROI-4

6.58

2.07

5.78

1.27

2.66

1.85

Image uniformity

2.07

1.7

1.85

  1. ΔCT = CTROI-i − CTROI-c i = 1, 2, 3. Numbers in bold represent the CT image uniformity measurement results