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How accurate are CT numbers…?

• HU of homogeneous material

can vary by 1-2%

• Depends on location (beam

hardening) – up to 3%

• Variation across scanners for

high density (>5% in cases)

• Electron Density of Tissue

Substitutes

• Tissue substitutes=tissues?

• Tissue Assignment (ICRU and

ICRP)?

M. Schwarz