7 & 8 Computed Tomography

________: illuminate the object from a point source, and the X- ray flux is measured on a plane to create a 3D image.

CAT: Computed ________, same as a CT.

The ________ of the projection function at an angle θ,) (P t θ, can be.

The ________ is a x- Φplot of the projection data PΦ (X)

The ________ sums the attenuation of the X- ray beam along line t in the s- direction.

Computed Axial Tomography, same as a CT

illuminate the object from a point source, and the X-ray flux is measured on a plane to create a 3D image

CT type, 1 detector, lasted 30 min

Ct type, 20-30 detectors, fan bean, less than 90 seconds

Ct type, 288-1k scanners, fan shaped, rotate-rotatements, 5 seconds

First CT generation to institute rotate/rotate modality

• Uses ___________ technology, brushes along the fixed part of the machine so that cables wouldn’t get wound up in the CT

More projections yields an _____in the accurately of the reconstructed image

Cons of better CT images that require more scans

The raw data of a CT is the…

Methods of CT Reconstruction

As the number of projection images in CTs increases, the contrast of the image…

What is the con of doing 10000000 projection images in a CT? Doesn’t it give you better images?

1000 x (ui - uwater)/uwater

The Hounsfield value of water is…

CT number is approximately ___________ to physical density