FC Rad Diag(SA) Part I Practice Questions - Fellowship Of The College Of Radiologists Of South Africa Part I FC Rad Diag(SA) Part I Exam

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In Computed Tomography (CT), how is the Hounsfield Unit (HU) of a tissue with linear attenuation coefficient μ_tissue defined relative to water (μ_water)?

HU = 1000 × [(μ_tissue - μ_water) / μ_water] HU = 100 × [(μ_tissue - μ_air) / μ_water] HU = 1000 × [(μ_water - μ_tissue) / μ_bone] HU = 500 × [(μ_tissue / μ_water)]

Correct Answer:

HU = 1000 × [(μ_tissue - μ_water) / μ_water]

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