Chapter 6 Assignment Flashcards
The main purpose of a grid is to absorb scatter, and decrease patient dose.
a.) true
b.) false
b.) false
Misalignment of the tube part IR relationship results in:
a.) shape distortion
b.) magnification
c.) blur
d.) size distortion
a.) shape distortion
Which of the following factors affect image distortion? Choose all that apply.
a.) mAs
b.) tube/part/film alignment
c.) grids
d.) OID
e.) kvp
f.) FSS
g.) patient factors
h.) SID
b.) tube part film alignment
d.) OID
g.) Patient factors
h.) SID
A large anode angle will decrease receptor exposure.
a.) true
b.) false
b.) false
As collimation increases, the quantity of scatter radiation decreases.
a.) true
b.) False
a.) true
The main prupose of a grid is to absorb scatter, and decreases patient dose.
a.) true
b.) false
b.) False
A radiograph that has densities that are very different from each other:
a.) has low contrast
b.) has high contrast
c.) has many shades of gray
d.) has long scale contrast
b.) has high contrast
The primary effect of scatter radiation on radiographic image quality is:
a.) decreased contrast
b.) decreased spatial resolution
c.) decreases brightness
d.) decreased receptor exposure
a.) decreased contrast
The main purpose of added filtration is to reduce:
a.) beam penetrability
b.) patient dose
c.) beam quality
d.) the HVL
b.) patient dose
The window width setting in a digital imaging system is used to manipulate which of the following values?
a.) spatial resolution
b.) image contrast
c.) temporal resolution
d.) pixel brightness
b.) Image contrast
Foreshortening can be caused by:
a.) excessive distance between the object and the IR
b.) adding a CR angle to the part
c.) Insufficient distan ce beetween 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
All of the following are related to spatial resolution except:
a.) focal spot size
b.) milliamperage
c.) OID
d.) SID
b.) milliamperage
Which of the following have an affect on image receptor exposure? Choose all that apply.
a.) FSS
b.) kvp
c.) SID
d.) motion
e.) grid ratio
f.) tube/part angle
g.) mas
b.) kvp
c.) SID
e.) grid ratio
g.) Mas
low kvp = ______________ contrast, __________ scale images. (choose all)
a.) short
b.) Low
c.) high
d.) long
a.) short
c.) high
Factors that can impact spatial resolution include:
1.) patient factors
2.) focal spot size
3.) SID
a.) 1, 2 and 3
b.) 1 and 2 only
c.) 2 and 3 only
d.) 1 only
a.) 1, 2 and 3
The type of contrast that is caused by variations in the tissue density within the anatomic part to be imaged defines which of the following?
a.) none of the answers are correct
b.) inherent contrast
c.) image contrast
d.) subject contrast
d.) subject contrast
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 and 2 only
b.) 1 only
c.) 2 and 3 only
d.) 2 only
a.) 1 and 2 only
Focal spot size effects:
a.) contrast
b.) spatial resolution
c.) distortion
d.) receptor exposure
b.) spatial resolution
Low kvp produces _______________ contrast images while high kvp produces ___________ contrast images.
a.) low;high
b.) high;low
c.) High;high
d.) low;low
b.) high;low
An increase in the image size of an object compared with its true, or actual size, is called:
a.) minification
b.) shape distortion
c.) sharpness distortion
d.) size distortion
d.) size distortion
Xrays travel at half the speed of light.
a.) true
b.) False
b.) false
Minimizing size distortion is accomplished by which of the following?
1.) using the longest feasible SID
2.) using the shortest possible OID
3.) decreasing the angle of the CR
4.) placing the part as close to the IR as possible
a.) 2 and 3
b.) 1, 2, 3 and 4
c.) 1, 2 and 3
d.) 1, 2 and 4
d.) 1, 2 and 4
SID affects both spatial resolution and image distortion.
a.) true
b.) false
a.) true
Mas directly affects all of the following exept:
a.) beam quanitity
b.) beam intensity
c.) beam quality
d.) xray output
c.) beam quality
Which of the following factors affect image contrast?
a.) mas
b.) collimation
c.) grid ratio
d.) FSS
e.) motion
f.) kvp
g.) anode heel effect
h.) OID
b.) collimation
c.) grid ratio
f.) kvp
h.) OID
A decrease in KVP will result in:
1.) a decrease in image resolution
2.) a decrease in photon energy
3.) a decrease in receptor exposure
a.) 2 and 3only
b.) 1 only
c.) 1, 2 and 3
d.) 1 and 2 only
a.) 2 and 3 only
More scatter radiation exits the patient when using low kv.
a.) true
b.) false
b.) false
A decreased anode angle results in an increased anode heel effect.
a.) true
b.) false
a.) true
