Exposure Basics
With a lower mAs value, there would be _________ photons striking the image receptor:
What is Fewer?
A DI number which is negative will indicate
What is Underexposure?
An exposure is made using 400 ππ΄and 0.05 π . What is the resulting mAs?
What is 20 mAs?
True or False:
Long exposure times are the direct cause of motion
What is False?
As kVp increases, what happens to beam quality?
What is Increases?
Fill in the blank: The optimal kVp strategy balances image quality with the ALARA principle to minimize patient
What is dose?
True or False:
mA and exposure time are inversely proportional to each other:
What is True?
A DI number which is positive will indicate:
What is Oveerexposure
An exposure is made at 300 mA and 150 ms. What is the total mAs?
What is 45 mAs?
The range of exposures that can be captured by an image receptor while still producing a usable image
What is Exposure Latitude?
True or False:
Adding filtration to the x-ray beam removes low-energy photons and can lower patient dose
What is True?
The beam with higher kVp is more _______ but provides less _______ in soft tissues
What is more penetrating, less contrast?
In digital radiography, which technical factor is considered the primary controller of patient skin dose
What is mAs?
Small blotches and insufficient exposure is known as
What is Quantum Mottle?
An exposure was made 100 mA & an exposure time of 0.25 seconds are used for an exam, what would be the new mA if the exposure time is changed to 0.125 seconds?
uX=25/(0.125) = What is X=200
u 25 =X(0.125)
mAs only affecting the beam quantity will directly affect the dose to: Three answers
What is
Tissues with lower atomic numbers will result in more _____ in x-ray images
What is Gray?
What is the optimal kVp for digital imaging at imaging a Non-Grid Chest
What is 86?
The greatest enemy to spatial resolution and sharpness is
What is motion?
The ratio of meaningful anatomic signal to background electronic or photon noise
What is Signal-to-Noise?
If a technologist changes from 10 ππ΄π to 20 ππ΄π , what happens to the number of electrons hitting the anode?
What is it doubles?
Which component of the x-ray tube is directly responsible for the 'mA' setting by controlling the heating of the filament?
What is the filament circuit?
The filament circuit regulates the temperature of the filament, which determines the rate of thermionic emission (mA)
The measure of electrical force or pressure behind a current of electricity
Decreasing kVP has what effect on subject contrast?
What effect on penetration?
What is decrease subject contrast?
Increase penetration?
High temperatures of the filament causes more electrons to be boiled off through
What is thermionic emissions?
While improper to patient care, ALARA, and overall radiographic standards, some systems can compensate for overexposures in excess of _____%, sometimes up to 600%
What is 200%?
Which mA station and time combination will produce the highest receptor exposure?
A.400 ππ΄ at 0.05 π
B.100 ππ΄at 0.5 π
C. 600 ππ΄ at 0.1 π
D.200 ππ΄ at 0.2 π
What is 600 mA @ 0.1 s (60mAs)
All of the following could lead to Quantum Mottle (Three answers):
What is
kVp primarily influences the average energy of photons and the level of __________ in the final radiographic image.
What is Contrast?
Scatter radiation originates primarily from: List Two
What is Large Body Parts and Large Field Sizes?