Advanced Physics Final

Window level and image brightness is a _____ relationship

Direct

What are the two DICOM standard classes?

Service class and object class

What is the most common photostimulable phosphor used in storage

Barium fluorohalide, europium activated

What does window width control

contrast

What is the range of gray values per pixel called:

bit depth

What is the most effective way to decrease noise

increase the mAs

What component of the intensifier tube converts xray to light

input phosphor

Image intensifier brightness gain increases with what increasing?

flux gain

What is the purpose LUT

predetermined scale of contrast to the digital data

Ability of an image intensify to increase the total image elimination is called:

Brightness gain

Electrostatic lens is used to accelerate and focus what?

electrons

The shape of the input screen helps to control:

distortion

The output screen of the I.I. absorbs ___ and emit ___.

electrons/ light

What percentage does off-focus radiation contribute to the x-ray beam

25%

Un sharp masking is a method of high-pass filtering that eliminates which frequency

low

Process of assigning “bins” to pixel data is:

normalization

The HVL is the only true measurement of the xray beam ____

penetrability

What step comes first in the digitalization process?

scanning

Errors in the histogram will lead to ______ error

exposure index

Digital imaging allows for a greater ______ an image production compared to film

latitude

What is the deviation index?

compares the entrance dose to the detector to a reference industry standard target dose

What is the purpose of the LUT

Apply a predetermined scale of contrast to the digital data set