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Table 2: Summary of differences in Hounsfield unit attenuation, contrast-to-noise, and image noise at 70 and 40 keV
40 keV (Median) (IQR) 70 keV (Median) (IQR) Difference (40-70 keV) 
(Median) (IQR) P Comparison (P)
Hounsfield unit attenuation
 Thyroid
  Absolute (HU) 158 (133–264) 84 (74–113) +67 (55–142) <.001 Par
<.001 SCM
  % Change +89% (66–123) <.001 Par
<.001 SCM
 Parathyroid
  Absolute (HU) 42 (29–59) 32 (22–41) +9 (4–17) <.001 Thy
.22 SCM
  % Change +29% (13–58) <.001 Thy
.09 SCM
 Sternocleidomastoid
  Absolute (HU) 67 (63–75) 57 (54–59) +11 (10–16) <.001 Thy
.22 Par
  % Change +22% (17–28) <.001 Thy
.09 Par
Contrast-to-noise 
 Thy/Par 4.7 (3.3–6.0) 3.8 (2.4–4.8) +0.8 (0.2–1.2) <.001 
 Thy/SCM 3.6 (1.7–5.0) 2.3 (0.9–3.1) +1.3 (0.7–1.9) <.001 
Image noise (HU) 32 (23–37) 16 (12–19) +14 (11–20) <.001 
Note:—Thy indicates thyroid; Par, parathyroid; SCM, sternocleidomastoid.