Term
When you increase collimation, what happens to the field of view?
Select one:
a. Increase
b. Decrease |
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Definition
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Term
The glass envelope is considered as which of the following types of filters?
Select one:
a. Compound
b. Added
c. Compensation
d. Inherent |
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Definition
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Term
The removal of low energy x-rays from the primary beam is referred to as
Select one:
a. scatter
b. attenuation
c. contrast
d. filtration |
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Definition
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Term
What is the relationship between the volume of tissue and scatter radiation?
Select one:
a. Directly related
b. Inversely related |
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Definition
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Term
Bones appear white on a radiograph due to _____ of x-ray photons.
Select one:
a. scattering
b. absorption
c. transmission |
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Definition
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Term
In bremsstrahlung x-ray production:
Select one:
a. the target electron originates in the cathode
b. the projectile electron is bound to an atom of tungsten
c. the target electron exists as a free electron
d. the projectile electron originates in the cathode |
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Definition
| d. the projectile electron originates in the cathode |
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Term
s the photon energy increases, _________ decreases.
Select one:
a. projectile electron energy
b. target electron binding energy
c. photon wavelength
d. photon frequency |
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Definition
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Term
The reduction in the total number of x-ray photons as they pass through a material is referred to as:
Select one:
a. attenuation
b. scatter
c. absorption
d. transmission
e. reduction |
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Definition
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Term
What is the relationship between an aperture and penumbra?
Select one:
a. Directly related
b. No relationship
c. Inversely |
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Definition
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Term
If the kVp is increased, what effect does that action have on absorption?
Select one:
a. No effect
b. increase absorption
c. decrease absorption |
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Definition
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Term
A collimator is the simplest of all beam restriction devices
Select one:
True
False |
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Definition
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Term
A toe filter is used to radiograph a foot. State the impact the toe filter has on radiographic density and radiographic contrast.
Select one:
a. decrease density and increase contrast
b. increase density and decrease contrast
c. decrease density and no effect on contrast
d. no effect on density and decrease contrast |
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Definition
| a. decrease density and increase contrast |
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Term
Radiation intensity is measured in "mR
Select one:
True
False |
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Definition
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Term
How would the emission spectrum be affected by the addition of 2 mm Al filtration? The relative position of the spectrum would:
Select one:
a. shift to the right, and the amplitude would be lower
b. remain the same, but the amplitude would decrease
c. remain the same, but the amplitude would increase
d. shift to the left, and the amplitude would be lower |
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Definition
| a. shift to the right, and the amplitude would be lower |
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Term
Attenuation is comprised of ___________ and _____________.
a. scatter
b. absorption
c. transmission
Select one:
a. a and b
b. b and c
c. c and a
d. a,b,c,and d |
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Definition
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Term
The higher the density of a body part, the _____ the chance for absorption to occur.
Select one:
a. lesser
b. body part density has no impact on absorption probabilities
c. greater |
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Definition
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Term
A decrease in the kVp will result in a _____ in the amount of scatter radiation reaching the film.
Select one:
a. no change
b. decrease
c. increase |
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Definition
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Term
Absorption is determined by all of the following except:
Select one:
a. atomic number
b. mAs
c. mass density
d. volume of the tissue |
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Definition
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Term
What is the relationship between penetrabilty and and absorption?
Select one:
a. Directly related
b. Inversely related |
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Definition
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Term
The amount of material required to reduce the intensity of the beam to one-half of its original value is the definition for:
Select one:
a. mAs-reciprocity
b. kVp
c. mAs-distance formula
d. half-value layer |
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Definition
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Term
The radiation produced at very discrete energies of approximately 69 kiloelectron volts (keV) when electrons interact with the K shell of the tungsten atoms is called:
Select one:
a. Characteristic
b. Grenz rays
c. Photoelectric
d. Bremsstrahlung |
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Definition
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Term
What is the purpose of beam restriction?
Select one:
a. Remove low energy photons and decrease patient dose
b. Decrease contrast and reduce patient dose
c. Remove low energy photons and increase patient dose
d. Increase contrast and reduce patient dose |
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Definition
| d. Increase contrast and reduce patient dose |
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Term
A compensating filter is used to
Select one:
a. even out widely differing tissue densities.
b. improve fluoroscopy.
c. absorb the harmful photons that contribute only to patient dose.
d. eliminate much of the scattered radiation. |
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Definition
| a. even out widely differing tissue densities |
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Term
What is the relationship between kVp and transmission?
Select one:
a. Directly related
b. Inversely related |
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Definition
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Term
Together, the filtering effect of the x-ray tube's glass envelope and its oil coolant are referred to as
Select one:
a. added filtration
b. inherent filtration
c. port filtration
d. compensating filtration |
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Definition
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Term
What is the relationship between the OID and subject detail?
Select one:
a. Directly related
b. Inversely related |
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Definition
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Term
Which of the following body substances has the highest atomic number?
Select one:
a. bone
b. muscle
c. fat
d. air |
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Definition
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Term
Filtration is the process of eliminating high energy x-ray photons from the primary beam.
Select one:
True
False |
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Definition
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Term
Which of the following has a greater chance of absorbing radiation?
Select one:
a. air
b. bone
c. fat
d. muscle |
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Definition
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Term
The total amount of inherent filtration for x-ray tubes is ___________?
Select one:
a. 0.5-1.0mm
b. 0.5-1.0mm
c. 5.0-10mm/AlEq
d. 0.5-1.0mm/AlE |
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Definition
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Term
An increase in the volume of tissue, does what to the absorption?
Select one:
a. Decrease
b. Increase
c. No effect |
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Definition
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Term
Which of the following is/are examples of inherent filtration?
1. wedge
2. glass tube
3. protective housing
4. trough
Select one:
a. 1 and 2
b. 1 and 3
c. 2 and 3
d. 2, 3, 4
e. 1, 2, 3, and 4
Feedback
Your answer is incorrect.
The correct answer is: 2, 3, 4 |
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Definition
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Term
The lower the atomic number of a body substance, the _____ the chance for scatter radiation to be produced
Select one:
a. greater
b. lesser
c. atomic number has no impact on the probability of scatter production |
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Definition
| c. atomic number has no impact on the probability of scatter production |
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Term
The effective energy of the x-ray beam is increased by increasing the
1. added filtration.
2. kilovoltage.
3. milliamperage.
Select one:
a. 1 only
b. 2 only
c. 1 and 2 only
d. 1, 2, and 3 |
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Definition
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Term
The composition of the x-ray beam as it leaves the anode is:
Select one:
a. Homogeneous
b. Heterogeneous
c. Monochromatic
d. Monoenergetic |
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Definition
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Term
Characteristic x-rays are produced when:
Select one:
a. orbital electrons move from an outer shell to fill an inner-shell vacancy
b. orbital electrons move from an inner shell to fill an outer-shell vacancy
c. an outer-shell electron is ejected from orbit
d. high-speed electrons are attracted by a tungsten nucleus and decelerated |
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Definition
| a. orbital electrons move from an outer shell to fill an inner-shell vacancy |
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Term
When filtration materials other than aluminum are used, their thicknesses are expressed in
Select one:
a. half-value layers
b. lead equivalents
c. Al/Eq
d. total filtration |
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Definition
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Term
The positive beam limiting device, when engaged:
Select one:
a. automatically collimates to the size of the film when the film is placed in the bucky
b. automatically collimates to the size of the film when the film is placed on the tabletop
c. allows the radiographer to open the collimator larger than the film size
d. provides no useful function for the radiographer |
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Definition
| a. automatically collimates to the size of the film when the film is placed in the bucky |
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Term
Increasing collimating has what effect on the amount of x-rays that reach the film?
Select one:
a. decreases the amount of x-rays that reach the film
b. collimation has no effect on the amount of x-rays that reach the film
c. increases the amount of x-rays that reach the film
d. collimation only effects how many x-rays reach the patient |
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Definition
| a. decreases the amount of x-rays that reach the film |
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Term
The radiation that leaves the tube and heads towards the patient is referred to as:
Select one:
a. secondary beam
b. primary beam
c. scatter radiation |
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Definition
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Term
What effect does collimation have on a radiographic image and patient exposure?
Select one:
a. increases scatter
b. decreases scatter
c. decreases patient exposure
d. b and c |
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Definition
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Term
Photons that exits the tube and does not interact with any tissue within the body is referred to as ____________?
Select one:
a. Transmission
b. Primary beam
c. Attenuation
d. Scatter |
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Definition
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Term
An increase in the atomic number of the irradiated material will cause aNo _____ in the amount of scatter radiation reaching the film.
Select one:
a. increase
b. no change
c. decrease |
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Definition
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Term
Scatter radiation that is emitted from the patient's body never reaches the film
Select one:
True
False |
|
Definition
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|
Term
What is the relationship between filtration and patient exposure?
Select one:
a. No relationship
b. Inversely related
c. Directly related |
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Definition
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Term
Consider the following types beam restrictors and match them to their respective characteristics
1. classified as the simplest form of a beam restrictor
2. consists of moving horizontal and vertical lead strips
3. currently the most common form of beam restriction
4. may be manufactured with a positive beam limiting device
5. when used, it is typically employed for head work
6. easiest to manufacture and relatively inexpensive |
|
Definition
Answer 1 – aperature diaphragm
Answer 2 – collimator
Answer 3 – collimator
Answer 4 – collimator
Answer 5 – cones/cylinders
Answer 6 – aperature diaphragm |
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Term
Total filtration is the sum of _____ and _____ filtration
Select one:
a. added, inherent
b. added, compensating
c. compensating, compound
d. inherent, compensating
e. inherent, compound |
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Definition
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Term
A high-speed electron entering the tungsten target is attracted to the positive nucleus of a tungsten atom and, in the process, is decelerated. This results in
Select one:
a. Bremsstrahlung radiation.
b. Compton scatter.
c. photoelectric effect.
d. characteristic radiation. |
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Definition
| a. Bremsstrahlung radiation. |
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Term
As the volume of irradiated material increases, scatter _____.
Select one:
a. decreases
b. increases
c. does not chang |
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Definition
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Term
This type of beam restrictor maintains its circumference and can attach to a collimator.
Select one:
a. cylinder
b. aperature diaphragm
c. cone
d. all of the above |
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Definition
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