The HU for Bone is

The HU for Bone is

• A. 0
• B. -150
• C. +2000 to +4000
• D. +150 to +1000

Answer: (D)

Hounsfield units quantify how much a tissue attenuates X-rays on CT. On this scale, air is around -1000, water is 0, and bone is much denser, giving high positive values. The range commonly used for bone on standard CT is roughly +150 up to +1000, which covers both cancellous bone near the lower end and cortical bone near the upper end. That’s why the option describing +150 to +1000 is the best fit. Values like 0 or -150 would indicate tissues less dense than water, not bone, while +2000 to +4000 exceed typical bone attenuation seen in routine CT and aren’t the standard reference range for bone density.

Hounsfield units quantify how much a tissue attenuates X-rays on CT. On this scale, air is around -1000, water is 0, and bone is much denser, giving high positive values. The range commonly used for bone on standard CT is roughly +150 up to +1000, which covers both cancellous bone near the lower end and cortical bone near the upper end. That’s why the option describing +150 to +1000 is the best fit. Values like 0 or -150 would indicate tissues less dense than water, not bone, while +2000 to +4000 exceed typical bone attenuation seen in routine CT and aren’t the standard reference range for bone density.