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Table 3 Quality assessments of polychromatic and VMIs using variable DRI values in small and large phantoms

From: Value of virtual monochromatic spectral image of dual-layer spectral detector CT with noise reduction algorithm for image quality improvement in obese simulated body phantom

 

Diagnostic acceptability

Subjective noise

DRI 16

DRI 19

DRI 22

DRI 25

DRI 16

DRI 19

DRI 22

DRI 25

S

Polychromatic

3.0 (0.00)

3.2 (0.45)

3.2 (0.84)

4.0 (1.00)

3.3 (0.50)

3.8 (0.50)

4.0 (0.00)

4.5 (0.58)

VMI*

3.4 (1.10)

4.0 (1.00)

4.4 (0.89)

4.6 (0.55)

3.5 (0.58)

4.5 (0.58)

5.0 (0.00)

5.0 (0.00)

p value

0.02†

< 0.01†

L

Polychromatic

2.5 (0.55)

3.0 (0.50)

3.4 (0.58)

4.0 (0.57)

2.0 (0.00)

3.3 (0.50)

4.0 (0.00)

5.0 (0.00)

VMI*

2.8 (0.96)

3.8 (0.45)

4.2 (0.88)

4.6 (0.55)

2.5 (0.45)

3.8 (0.50)

4.5 (0.58)

5.0 (0.00)

p value

0.03†

0.04†

  1. Note – * VMI were evaluated in range of 40–110 keV. Data presented with † indicate those with statistical significance. Values given are mean (SD). DRI dose right index, S small, L large
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BMC Medical Imaging

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