問題一覧
1
IR of Conventional X-ray?
Film Screen Cassette
2
IR of Computed Radiography
Imaging Plate
3
IR of Digital Radiography
Flat Panel Detector
4
represents the amount of current passed through the X-ray tube.
mA
5
determines the number of photons the X-ray tube produces, also known as X-ray quantity.
Current
6
Total exposure time is measured in what unit?
Seconds
7
controls the length of the x-ray exposure by determining how long the current (mA) will be passing through the x-ray tube.
Exposure time
8
measure of radiation produced (milliamperage) over a set amount of time (seconds) via an x-ray tube.
Milliampere-seconds (mAs)
9
calculation for receptor exposure formula
mas1 over mas2 equals D1^2 over D2^2
10
pertains to mAs in the sense that all combinations of mA x seconds that amount to an equal quantity will produce the same amount of density.
Reciprocity Law
11
________ with a longer time allow for less patient motion
smaller mA
12
measures how much scatter is removed by the grid and how the mechanical factors be adjusted to produce the same optical density.
Bucky Factor
13
ratio of the mAs required with the grid to the mAs required without the grid to produce the same optical density
Bucky Factor
14
Use of grid increases what by the Bucky?
Patient dose
15
of a film represents the amount of radiation required to produce a radiograph of acceptable density.
Speed Class
16
As the speed of the film increase, the amount of radiation needed to properly expose it will what?
Decrease
17
Increasing speed also decreases image noise. True or False
False. Increase
18
Speed for routine work: Speed for high detail:
• 200-800 • 50-100
19
speed films that are small grain, better definition, more exposure
Slow speed films
20
Letter of each Fast Speed Films (ultra ekta speed) (ekta speed) (ultra speed)
F E D
21
can be measured by - intensification factor, - relative name or speed value
Screen Speed
22
exposure required to create a certain optical density without a screen is divided by the exposure required with a screen to create the same optical density determines?
Intensification Factor
23
distance between the x-ray tube and the image receptor is the
Source to Image Distance (SID)
24
Screen speed used for high resolution?
Slow
25
Screen speed used for regular/standard
Medium
26
Screen speed used for fast screen?
Fast
27
According to inverse square law, if you move twice as far from the source the intensity of the radiation will decrease by a factor of what?
4