Image Quality Flashcards
Detective quantum efficiency (DQE) is a measure of which of the following?
Lack of image noise
In imaging applications, because contrast resolution and visibility of detail are mandatory for diagnostic interpretation, ____ is important.
high DQE
The ability of an imaging system to distinguish structures with similar x-ray transmission as separate entities is known as
contrast resolution.
The amount of light either scattered or emitted by a surface is known as
luminance.
The type of contrast that is caused by variations in the tissue density within the anatomical part to be imaged, defines which of the following?
Subject contrast
Which of the following terms is the unit most commonly used to measure luminance?
Nit
Which of the following terms best describes the ability of an imaging system to create separate images of closely spaced high-contrast objects?
Spatial resolution
Which of the following can be thought of as the amount of information recorded in an image divided by the information available in the part?
Modulation transfer function
The window width setting in a digital imaging system is used to manipulate which of the following values?
Image contrast
Which modality generally display the greatest spatial resolution?
Digital mammography
Collimation systems equipped with positive beam limitation must be accurate to within ____ of the SID
±3%
During the exposure linearity test, the amount of radiation/mAs should vary by no more than ±___% from the average.
10
If the x-ray field is smaller than that indicated by the indicator knob on the collimator, the radiographer risks
Cutting off anatomy of interest
The kilovolts peak (kVp) must be accurate to
±5%
The light field and radiation field of a radiographic unit must be congruent to within ____ of the SID.
±2%
