Exam 16: Computed Tomography

The image matrix for CT is __________ than the image matrix for digital radiography.

The composite electrical signal based on transmission values is the:

This shading artifact is due to the beam energy changing (and therefore the CT numbers)as the beam passes through the anatomy.

Hounsfield unit is another name for the CT number.

Noise can be reduced by using a:

This translate-rotate scanner used a single detector.

When the voxel is large enough to contain different types of tissues,the CT number will be an average of the various tissues' attenuation characteristics.This produces a ____________________ .

The CT system's uniformity can be determined by seeing if:

Slices of anatomy that go from side to side are:

With spiral CT imaging,the relationship between slice thickness and table travel during one tube rotation is the:

This is the only generation of CT scanners that used parallel beam geometry.

The sequence of computer operations for accomplishing a specific task,such as reconstruction is a(n):

This translate-rotate scanner used approximately 30 detectors and a narrow fan beam.

This is the process that allows the tube to continue rotating around the patient without the need to rewind.

This scanner uses a wide fan beam and a fixed array of detectors that encircle the patient.

The CT x-ray tube and detector array are found in the:

How will a pixel with a CT number of -250 appear if the WW is 600 and the WL is -300?

EBCT was developed to be fast enough to image the:

For single-slice CT,this collimator controls the slice thickness.

The grainy appearance of a CT image that is due to the random variations of CT numbers is: