Digital Imaging Fundamentals - Module 1 Terms & Definitions

The beam that contains useful or diagnostic information is known as the

remnant beam

Digital imaging systems have a large dynamic range, which means that they can respond to a wide range of

exposures

In analog imaging, the intensifying screen converts x-rays into

light photons

In an analog to digital converter, the analog input consists of

electrons

Which of the following symbols compose the binary language

0

1

#

0,1

How many shades of gray does an 8 bit image display?

256

As the pixel size decreases the recorded detail

Increases

Scintillation refers to a materials ability to give off

light

The acronym PSP stands for photo stimulable

Phosphor

During processing image data is released from a PSP receptor after the receptor is struck by

a red laser beam

Direct image formation converts x-rays into

electrons

Individual components of a digital image are collected in areas of a thin film, transistor known as

DELs

Random information within a diagnostic image that detracts from the overall image appearance is known as

noise

CCD's are suitable for low-dose imaging because they

Respond to low light levels

DQE is a measure of image

quality

Selecting a lower sampling frequency during image processing results in

Larger pixel size and lower resolution

For flat panel detectors, the spatial resolution is determined by the size of the

DELs

The Nyquist theorem states that for a given spatial resolution, you must sample the signal at _____ times the desired sample frequency

2

A digital receptor can produce an image that appears acceptable on a display monitor, but that was produced between

50% underexposure and 100% overexposure

Which of the following is a visual queue that a digital image is under exposed

Increase in image noise

Receptor blur is the result of

imaging equipment

When a digital fluoroscopy units, magnification button is used, the resulting magnification is due to a decrease in the size of the

input phosphor