Chapter 6 Quiz Flashcards
The primary effect of scattter radiation on radiographic image quality is:
a.) decreased spatial resolution
b.) decreased brightness
c.) decreased contrast
d.) decreased receptor exposure
c.) decreased contrast
Calculate the casual repeat rate for positioning: 1200 total images, 75 repeats, 30 repeats for positioning
40%
Calculate the total repeat rate: 1600 total images, 120 repeats
7.5%
mAs directly effects all of the following exccept:
a.) beam quality
b.) beam quantity
c.) beam intensity
d.) xray output
a.) beam quality
What does an S number singinificantly below 200 indicate of an exposure indicator?
a.) excessive receptor exposure
b.) insufficient contrats
c.) excessive contrast
d.) inadequate receptor exposure
a.) excessive receptor exposure
A tech is using a variable KVP technique chart for a certain table top exam. The chart calls for 80 kvp but the tech uses 83 kvp. The resulting image will likely demonstraste:
a.) saturation artifact
b.) quantam mottle artifact
c.) no visible errors
d.) loss of contrast
c.) no visible errors
Phantom artifacts can occur due to:
a.) not erasing the IR
b.) radiation fog
c.) heat
d.) backscatter
a.) Not erasing the IR
As collimation increases, the quantity of scatter radiation decreases.
a.) true
b.) false
a.) true
Foreshortening can be caused by:
a.) excessive distance between the object and the IR
b.) the radiographic object being placed at an angle to the IR
c.) adding a CR angle to the part
d.) insufficient distance between the focus and the IR
b.) the radiographic object being placed at an angle to the IR
More scatter radiation exits the patient when using low KV.
a.) false
b.) true
a.) false
SID affects both spatial resolution and image distortion.
a.) true
b.) false
a.) true
Which of the following factors affect image distortion? Choose all that apply.
a.) KVP
b.) MAS
c.) grids
d.) tube/part/film alignment
e.) patient factors
f.) FSS
g.) OID
h.) SID
d.) tube/part/film alignment
e.) patient factors
g.) OID
h.) SID
Which of the following have an affect on image receptor exposure? Choose all that apply.
a.) grid ratio
b.) tube/part angle
c.) motion
d.) FSS
e.) KVP
f.) MAS
g.) SID
a.) grid ratio
e.) KVP
f.) MAS
g.) SID
Misalignment of the tube part IR relationship results in:
a.) magnification
b.) blur
c.) Size distortion
d.) shape distortion
d.) shape distortion
A radiograph that has densities that are very different from each other
a.) has many shades of gray
b.) has low contrast
c.) has long scale contrast
d.) has high contrast
d.) has high contrast
Why do double exposure artifacts occur in DR?
a.) the image reader malfunctioned
b.) the IR was not erased throughly
c.) backscatter
d.) Images are taken rapidly/too close together
d.) images are taken rapidly/too close together
Physical damage to the structure of a CR image receptor is likely to manifest on a radiograph as:
a.) loss of spatial resoltuion
b.) geometric distortion
c.) loss of contrast
d.) hyperdense artifact
d.) hyperdense artifact
Low kvp produces __________________ contrast images while high kvp produces __________ contrast images.
a.) low;high
b.) high;low
c.) low;low
d.) high;high
b.) high;low
dirt/debris would be a _____________ artifact.
a.) plater reader
b.) operator error
c.) image receptor
d.) mishandling
c.) image receptor
To prevent background radiation artifact, which of the following should be done?
a.) erase the IR plates daily
b.) do not expose the IR to heat
c.) handle the IR with care
d.) charge the IR daily
a.) erase the IR plates daily
The main purpose of added filtration is to reduce:
a.) the HVL
b.) beam penetrability
c.) beam quality
d.) patient dose
d.) patient dose
If a radiographic demonstrates an S number of 80 with no visible exposure errors, the tech should consider which of the following options:
a.) repeat the radiograph using a higher technique
b.) repeat the radiograph using a grid
c.) submit the radiograph as is
d.) repeat the radiograph using a lower techique
c.) submit the radiograph as is
