What is hyper attenuation on a ct scan?

Answer 1

Strictly speaking, the physics of CT scanning involves attenuation of the x-ray by tissues in a manner not always exactly congruent with density differences. Hyperattenuation is a better term than hyperdense for more white and bright on the image.

Hyperdense: More dense than brain. Hyperdense on CT shows more white and bright, like bone. Hyperdense abnormalities may be blood if acute, calcium, metal artifact, some tumours