Image Acquisition Exam 2

Ability of the imaging system to convert photons into an image

Detective Quantum Efficiency (DQE)

A score that describes the ability of the imaging system to convert the remnant xray beam into a high-quality image

Detective Quantum Efficiency (DQE)

High DQE = __ (high or low) efficiency in converting the xray signal into an image

High

High DQE = __ (lower or higher) xray signal can be used to produce a quality image

Lower

Low DQE = __ (Low or high) efficiency in converting the xray signal into an image

Low

Low DQE = __ (lower or higher) xray signal required to produce a quality image

Higher

High DQE = __ signal and _ noise

More, less

DQE is scored on a scale from

100% to 0%

What is a perfect DQE score

100%

Cesium Iodide used in indirect DR has __ % DQE

80%

Amorphous Selenium used in direct DR has __ % DQE

70%

Barium Fluorohalide used in CR has a __ % DQE

Less than 30%

Percentage of photons that get absorbed by the detector

Capture efficiency

High kVp = __ DQE

Low

Highest DQE is achieved at the __ kVp

Lowest

What material has superior DQE at almost all photon energies

Cesium iodide

__ is random information created by the electronic components in the imaging system

System noise

Size of the objects being imaged and the space between objects

Spatial frequency

Low frequency = __ DQE

High

__ has superior DQE at all spatial frequencies

Cesium iodide

__ radiography uses a cassette-based system

Computed