Chapter 6 Test Flashcards
In digital imaging, mAs selection has an effect on:
1.) receptor exposure
2.) patient dose
3.) brightness
a.) 1, 2 and 3
b.) 2 and 3 only
c.) 1 only
d.) 1 and 2 only
d.) 1 and 2 only
All of the following are related to spatial resolution except:
a.) millamperage
b.) SID
c.) OID
d.) focal spot size
a.) milliamperage
Dropped pixels are caused by:
a.) nonfunctioning detector elements
b.) electronic interference
c.) double exposure
d.) histogram errors
a.) nonfunctioning detector elements
What does an S number significantly below 200 indicate of an exposure indicator?
a.) insufficient contrast
b.) excessive contrast
c.) excessive receptor exposure
d.) inadequate receptor exposure
c.) excessive receptor exposure
The greatest contributing factor in the production of scatter radiation is:
a.) patient thickness
b.) kvp
c.) patient position
d.) mas
a.) patient thickness
An image demonstrating many brightness levels, or shades of gray, with only slight differences between the levels/shades is said to possess:
1.) long scale contrast
2.) low contrast
3.) short scale contrast
a.) 1 only
b.) 1 and 2 only
c.) 2 only
d.) 2 and 3 only
1 and 2 only
The corduroy effect is caused by:
a.) increased sensitivity to radiation
b.) background radiation
c.) printer malfunction
d.) double exposing the IR
c.) printer malfunction
Dirt/debris would be a ____________ artifact.
a.) image receptor
b.) plate reader
c.) mishandling
d.) operator error
a.) image receptor
As collimation increases, the quantity of scatter radiation decreases.
a.) true
b.) false
a.) true
Foreshortening can be caused by:
a.) adding a CR angle to the part
b.) excessive distance between the object and the IR
c.) insufficient distance between the focus and the IR
d.) the radiographic object being placed at an angle to the IR
d.) the radiographic object being placed at an angle to the IR
Calculate the causal repeat rate for positioning: 1200 total images were taken, 75 repeats, 30 repeats for positioning.
40%
The window width setting in a digital imaging system is used to manipulate which of the following values?
a.) image brightness
b.) image contrast
c.) temporal resolution
d.) spatial resolution
b.) image contrast
A radiograph that has densities that are very different from each other
a.) has high contrast
b.) has long scale contrast
c.) has many shades of gray
d.) has low contrast
a.) has high contrast
When critiquing an image, it is determined that there is a photographic property error. What would be the next step in evaluating the image?
a.) determining if the error is kvp or mas
b.) determining if the error is distortion or magnification
c.) determining if it is an equipment malfunction
d.) determining if it is a patient error
a.) determining if the error is kvp or mas
The appearance of quantam mottle on a radiographic image is caused by:
a.) inadequate receptor exposure
b.) small matrix size
c.) incorrect post processing
d.) excessive receptor exposure
a.) inadequate receptor exposure
If a processor error misrepresents the areas on an image (light is dark/dark is lighter) this is called:
a.) excessive equalization
b.) quantam mottle
c.) electronic noise
d.) laser printer error
a.) excessive equalization
A tech is using a variable mas technique chart for a certain mobile exam. The chart calls for 12 mas by the tech uses 1.5 mas. The resulting image will likely demonstrate:
a.) saturation artifacts
b.) no visible errors
c.) quantam mottle artifact
d.) loss of contrast
c.) quantam mottle artifact
The appearance of saturation on a radiographic image is caused by:
a.) inadequte receptor exposure
b.) small matrix size
c.) incorrect post processing
d.) excessive receptor exposure
d.) excessive receptor exposure