CT Detector Terminology Quiz

Question 0

Refers it the steadiness of the detector response

Gets the information then calibrates it then starts the process over.

Answer 0

Stability

Question 1

How well the detectors receive photons from the patient (detector size and distance between detectors)

Answer 1

Capture efficiency

Question 2

How well the detector converts the absorbed photon information to a digital signal for the computer

Answer 2

Conversion efficiency

Question 3

Is the number of gray shades that an imaging system can produce

Answer 3

Dynamic range

Question 4

Relative number of x-rays that interact with a detector

Answer 4

Quantum detection efficiency

Question 5

Refers to the persistence of the image even after the radiation has been turned off, basically continues to glow after radiation is turned off.

A brief persistent flash of scintillation that must be taken into account and subtracted before image reconstruction.

Answer 5

Afterglow

Question 6

Is the product of capture efficiency absorption efficiency and conversion efficiency it produces the total detector efficiency or dose efficiency

Answer 6

High reproducibility

Question 7

Refers to the speed with which the detector can detect an x-ray event and recover to detect another event.

Time required for the signal from the detector to return to zero after stimulation of the detector by x-ray radiation so that it is ready to detect another x-ray event

Answer 7

Response time

Question 8

How well the detectors convert incoming x-ray photons

Answer 8

Absorption efficiency