The calculation of CT numbers is based upon the calculation of
A)half-value layers.
B)half-lives.
C)attenuation coefficients.
D)pitch.

Question

Quizplus · Accepted Answer

CT numbers, also known as Hounsfield units, are calculated based on the attenuation coefficients of different tissues. Attenuation coefficient refers to the ability of a particular tissue to absorb or scatter the x-rays passing through it. This is what sets CT apart from other imaging modalities like conventional radiography, in which only the amount of attenuation (and not the coefficient) is measured. Half-value layers (A) and half-lives (B) are relevant in the measurement of radioactive decay, but not in CT image formation. Pitch (D) is a technical parameter that relates to the distance traveled by the patient table with respect to the x-ray beam, but it is not directly related to CT number calculation.

The Calculation of CT Numbers Is Based Upon the Calculation