1  CT Basic

1.1 Density

Figure 1.1: Hounsfield scale (ref)

Air (- 1000) < Fat (-100) < Water (0) < Soft tissue (+50) < Bone & Metal (1000)

Blood

  • Flowing blood ≈ 40 HU

  • Clotted blood ≈ 100 HU

Abdomen

  • Normally, Liver dense > spleen, if not suspect fatty liver.

Figure 1.2: Fat stranding

Fat stranding: increase density (dirty) around fat dueto increase fluid / soft tissue from inflammation Figure 1.2 (ref)