TABLE 4.
Comparison of Coronary Artery and Stent Lumen ROI Data (Surface, HU, and Noise) Between the 2 Systems and Different SPCCT Kernels
| EID-DLCT | SPCCT | XCD vs Sharp | Detailed 2 vs Sharp | |||
|---|---|---|---|---|---|---|
| XCD | Detailed 2 | Sharp | P | P | ||
| Coronary artery | ||||||
| Surface, mm2 | Obs 1 | 12.0 (5.4) | 10.8 (6.2) | 11.0 (1.9) | 0.63 | 0.13 |
| Obs 2 | 5.5 (1.3) | 6.4 (1.8) | 6.4 (1.8) | 0.15 | 0.32 | |
| Density, HU | Obs 1 | 510 (194) | 439.3 (243.8) | 446.2 (236.1) | 0.63 | 0.46 |
| Obs 2 | 521 (161) | 450 (245) | 455 (247) | 0.75 | 0.11 | |
| SD | Obs 1 | 65.3 (17.7) | 60.6 (17.4) | 135.2 (65.5) | 0.002 | 0.001 |
| Obs 2 | 56.9 (2.3) | 49 (6.5) | 157 (23) | 0.003 | 0.001 | |
| Stent lumen | ||||||
| Surface, mm2 | Obs 1 | 3.2 (2.1) | 3.2 (3.2) | 4.3 (2.6) | 0.24 | 0.65 |
| Obs 2 | 6.3 (4.5) | 2.2 (2.2) | 2.2 (2.1) | 0.002 | 0.53 | |
| HU, HU | Obs 1 | 629 (449) | 519 (321) | 512 (311) | 0.01 | 0.04 |
| Obs 2 | 608 (723) | 535 (303) | 520 (309) | 0.008 | 0.008 | |
| SD | Obs 1 | 56.6 (26.0) | 70.4 (50.7) | 122.5 (75.3) | 0.002 | 0.004 |
| Obs 2 | 88 (62.9) | 96.1 (41.8) | 98.9 (55.4) | 0.24 | 0.028 | |
| Δ S-C* | ||||||
| Obs 1 | 148 (304) | 109 (90) | 84 (61) | 0.04 | 0.019 | |
| Obs 2 | 210 (377) | 124 (92) | 107 (106) | 0.023 | 0.005 | |
Continuous variables are presented as median (interquartile range). Data in bold indicate significant values.
* Medians of the absolute values of the Δ S-Cs.
EID-DLCT indicates energy integrating detectors dual-layer computed tomography; HU, Hounsfield unit; ROI, region of interest; SPCCT, spectral photon counting computed tomography; XCD, Xres cardiac detailed.