Table 2 Objective and subjective image quality between DE CTPA VMS and the standard CTPA datasets.
Low CM DECT | Standard CM DECT | Standard CTPA | p-value | ||||||
|---|---|---|---|---|---|---|---|---|---|
40 keV[A] | 50 keV[B] | 40 keV[C] | 50 keV[D] | [E] | |||||
Main pulmonary arteries | A vs C | B vs D | B vs E | D vs E | |||||
Attenuation | 649.2 ± 59.7 | 437.4 ± 39.5 | 850.2 ± 242.5 | 575.3 ± 161.3 | 375.7 ± 120.3 | <0.0001 | <0.0001 | 0.0022 | <0.0001 |
Signal-to-noise-ratio | 16.1 ± 2.8 | 16.8 ± 2.8 | 21.5 ± 9.1 | 22.1 ± 9.3 | 14.0 ± 3.7 | <0.0001 | <0.0001 | 0.0002 | <0.0001 |
Contrast-to-noise-ratio | 14.4 ± 2.4 | 14.5 ± 2.4 | 20.7 ± 9.1 | 20.8 ± 9.1 | 12.7 ± 3.5 | <0.0001 | <0.0001 | 0.0073 | <0.0001 |
Subjective image quality | 4[4–5] | 5[4–5] | 4[4–5] | 5[4–5] | 5[4–5] | 0.8762 | 0.7335 | 0.6581 | 0.6632 |
Subjective image noise | 4[3–4] | 4[3–5] | 4[3–4] | 4[4–5] | 4[3–5] | 0.8571 | 0.7684 | 0.8039 | 0.1344 |
Peripheral pulmonary arteries | A vs C | B vs D | A vs E | C vs E | |||||
Attenuation | 545.4 ± 74.2 | 358.5 ± 48.0 | 857.4 ± 246.0 | 580.1 ± 163.5 | 358.8 ± 110.4 | <0.0001 | <0.0001 | <0.0001 | <0.0001 |
Signal-to-noise-ratio | 13.8 ± 6.2 | 14.0 ± 5.9 | 14.6 ± 6.3 | 15.1 ± 6.4 | 9.7 ± 4.5 | 0.4045 | 0.3017 | <0.0001 | <0.0001 |
Contrast-to-noise-ratio | 12.1 ± 5.5 | 11.7 ± 5.1 | 14.1 ± 6.3 | 14.1 ± 6.3 | 8.8 ± 4.2 | 0.1466 | 0.0538 | 0.0064 | <0.0001 |
Subjective image quality | 5[4–5] | 5[4–5] | 5[4–5] | 5[4–5] | 5[4–5] | 0.7976 | 0.8112 | 0.3475 | 0.7214 |
Subjective image noise | 4[3–4] | 4[3–5] | 4[3–4] | 4[3–5] | 4[3–4] | 0.9117 | 0.8549 | 0.1224 | 0.1463 |
