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