Question

1. What do you expect the CT number for muscle for a 50 keV X-ray CT scan?

2. What do you expect the CT number for soft tissue for a 50 keV X-ray CT scan?

Answer 1

Hounsfield scale or CT number is a quantitative scale for describing radiodensity. The ability of matter to attenuate X- ray is measured in hounsfield unit or CT number.

The absorption of X- ray energy is proportional to the atomic number and the density of the material. The contrast may be expressed on a scale norally applied in the field of computed tomography scanning. The cotrast in X- ray is originated from difference in absorption of X- ray by the pure product. Absorption depend upon simple thickness and tissue composition.

CT number for muscles for a 50keV X ray CT scan 20-180 hounsfield range. And for soft tissue includes fat, muscles,blood vessel etc. Soft tissue range from 30 to 100 .