Exam 41: Computed Tomography

A series of tissue density values that evolved for CT measurements is called ____ units.

The gantry of the CT unit contains the

In order for a CT x-ray photon to be measured, it must 1)enter the detector 2)be absorbed by the detector material 3)transmit through the detector to be back-projected 4)have sufficient energy to undergo a Compton interaction 5)be converted to light and then electrical energy as a signal

The CTDI dose measurement

Contemporary CT scanners use solid state detectors.These detectors utilize

With MSCT scanners, resolution is primarily determined by

The ____ is how well the detectors receive photons from the patient.

CT image data is acquired in the

The range of CT numbers or Hounsfield Units varies from

The CT radiation beam is collimated

The most recent generation of CT scanners use a ____ motion.

The CT table is

The CT console provides the radiographer access to

MSCT scanners have evolved greatly over the last few years, particularly with regard to slice combinations, scanning speed, and clinical utility.As these scanners gather more slices of data per rotation, a major technological challenge is

If the table is moving at 5 mm/sec., and a pitch of 0.8 is being used, what is the section thickness?

If the table is moving at 12 mm/sec., and a section thickness of 10 mm is being acquired, what is the pitch?

A ____ artifact is caused by attenuation of the beam as it passes through the patient.

A ____ artifact is caused by the presence of metal in the patient.

The ____ is determined by how well the detector converts the absorbed photon information to a digital signal for the computer.

Modern pulsed CT scanners operate at