Table 3:

Image-quality comparison between energy-integrating detector and photon-counting detector CT for gray matter, white matter, and CSF

Image-Quality IndexEIDaPCDaP ValueImprovement Ratiob (%)
GM noise (HU)3.9 ± 1.03.2 ± 0.5<.00117.9
WM noise (HU)3.4 ± 0.82.7 ± 0.7.00220.6
CSF noise (HU)3.9 ± 0.83.4 ± 0.7<.00112.8
GM SNR10.5 ± 2.512.6 ± 2.2<.00119.0
WM SNR9.5 ± 2.311.4 ± 2.7.0120.0
GM–WM contrast (HU)8.9 ± 1.810.3 ± 1.9.0215.7
GM–WM CNR1.8 ± 0.52.4 ± 0.8<.00133.3
  • a Values are means ± SD.

  • b Improvement ratio was defined as the difference between EID and PCD quality indices (image noise, SNR, GM–WM contrast, and CNR) divided by the EID quality index.