Exam 4: Data Acquisition Concepts

Electromechanical devices made up of rings and brushes to transmit electrical energy across a rotating interface are called:

Multirow CT detectors fall into two categories, namely, matrix array detectors and pixel array detectors.

First-generation scanners were first to use fan-beam geometry.

CT detectors generate a signal that represents the attenuation as the ray moves across the slice. This signal is called:

Which scanner allows for continuous rotation of the X-ray tube while the patient moves simultaneously through the gantry aperture?

Please match the following data acquisition concepts. All answer selections will be used just once. -Scintillation

The configuration of the dual-row detector system results in faster volume coverage compared with single-row CT systems.

The ratio of the largest signal to the smallest signal measured by a CT detector is the:

Gas-ionization chambers were first introduced in second-generation scanners.

Seventh-generation scanners use flat-panel digital area detectors.

Which of the following refers to a method by which the patient is systematically scanned by the X-ray tube and detectors to collect enough information for image reconstruction?

The change of attenuation and thickness data into transmission measurement is called efficiency conversion.

Please match the following data acquisition concepts. All answer selections will be used just once. -Collimation

Please match the following data acquisition concepts. All answer selections will be used just once. -Ionization detector

Streaking artifacts are the result of too many samples being measured by the detectors.

In which scanner is the apex of the fan beam located outside the detector?

Optoelectronics refers to the use of lens and light diodes to facilitate data transmission.

What provides doubling sampling by obtaining two overlapping slices for each detector row per 360-degree rotation?

Gas-ionization CT detectors convert X-ray photons into electrical signals with no light conversion process in-between.

What style of filter is common in CT filtration because it compensates for the difference in beam path length through the axial plane of the object such that a more uniform fluence can be delivered to the detector?