Digital Imaging Questions 3

all of the above

The probability that an x-ray will interact with an image receptor depends on which of the following:

-thickness of capture layer

-atomic composition

true

T/F: Digital systems can be operated at a wide range of exposures, therefore making the term "speed" an inappropriate descriptor.

DQE

This is a measure of x-ray absorption effceincy.

all of the above

Characteristics of PSP's include the following:

-Phosphor types

-Conversion efficiency

-System speed class

-Detective quantum efficiency

true

T/F: With digital imaging systems, contrast is now unrelated to dose unlike analog film-screen systems.

false

T/F: You can not and should not collimate with digital imaging systems because it could result in a histogram error.

false

T/F: A partial loss of a row of DEL's can be fixed easily because all you have to do is replace the individual DEL or row of DEL's.

true

T/F: Digital imaging systems are more sensitive to scatter and background radiation than analog film-screen systems.

5-15

With digital imaging systems, your kVp may be _______ kVp higher than with analog film-screen systems.

conversion efficiency

_________________ is the rate at which x-ray energy is transformed into light in an intensifying screen.

true

T/F: With digital imaging systems, an additional 0.1-0.2 mm of copper filtration is recommended to reduce patient dose.

true

T/F: Rescaling forces a radiographer to look elsewhere for signs that a proper exposure was used to produce an image.

DR, analog film-screen

DQE is highest for _________ systems and lowest for __________ systems.

dose creep

____________ refers to the tendency, with digital radiography, to gradually increase patient dose over time.

false

T/F: You do not need to use a grid with digital imaging systems.

true

T/F: Digital imaging blur is caused by motion and changes in geometric factors.

false

T/F: Needle crystals result in more light divergence when stimulated compared to turbid phosphor material.

image blur

The following image is an example of:

dirty plate

What was more than likely the cause of this artifact?

dirty plate

What was more than likely the cause of this artifact?

processing

This is clearly a __________ artifact beacuse is runs the entire width of the plate.

false

T/F: Digital imaging is mAs driven.

dirty light guide in plate reader

What was more than likely the cause of this artifact?

all of these are correct

Suggested ways aimed at controlling patient exposure with digital imaging systems include which of the following:

-Additional filtration

-Higher kVp levels

-Interfacing with AEC

-Maintain ALARA principles

laser jitter

What was more than likely the cause of this artifact?

CaS

Common image capture elements utilized with digital image receptors include all of the following except:

-BaFBr

-CsI

-CaS

-a-Se

dirty light guide in plate reader

What was more than likely the cause of the artifact labeled A?

false

T/F: With the advent of digital imaging systems, it has become a lot harder for patient dose to be monitored.

PSP artifact (cassette-less)

What was more than likely the cause of this artifact? (All images produced with this unit will show this artifact)