What is the maximum CT number for bone?

The maximum CT number for bone is known to be around 1000 Hounsfield Units (HU). Hounsfield Units are a quantitative scale for describing radiodensity in computed tomography.

Bone, being one of the densest biological tissues, has a significantly higher radiodensity compared to other tissues like fat or soft tissue. The specific range of CT numbers for bone typically falls between 300 to 1000 HU, with very dense cortical bone achieving values close to or at the upper limit of this scale.

While some high-density materials or possibly certain types of metal can exceed 1000 HU, in the context of human anatomy and typical clinical practice, bone is consistently characterized by a maximum around 1000 HU. This makes the choice of 1000 HU the correct answer when considering the maximum CT number for bone.