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Chapter 30-Recorded Detail
Final
30
Other
Graduate
03/21/2011

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Cards

Term
The radiographic image exhibits all the details of the anatomical part.
Definition
False
Term
Clinically, an excellent guidepost to image resolution is bony trabeculation.
Definition
True
Term
Quantum Mottle can enhance detail.
Definition
False
Term
Voluntary motion can be controlled with proper communication.
Definition
True
Term
Involuntary motion is best controlled with lower kVp.
Definition
False
Term
Digital image contrast is determined primarily by matrix size, pixel size, and gray scale bit depth.
Definition
False: Recorded Detail
Term
Spatial resolution is expressed in three dimensions of an image: the x axis, the y axis, and z axis.
Definition
True
Term
Quantum noise is background information that the image receptor receives.
Definition
False
Term
Digital imaging requires that the spatial resolution frequency signal be sampled once from each cycle.
Definition
False
Term
The major factor that limits photostimulable phosphor systems is the size of the detector element.
Definition
False
Term
Recorded detail is
a. the degree of geometric sharpness
b. definition
c. the accuracy of the structural lines actually recorded in the radiographic image.
d. all of the above
Definition
d. all of the above
Term
The unit of resolution is:
Definition
line pairs per millimeter
Term
Poor resolution is caused by unacceptable levels of:
Definition
penumbra
Term
Which can obscure detail?
Definition
Motion
Term
Factors affecting recorded detail include:
Definition
focal spot size
Term
Resolution is improved when:
Definition
OID decreases
Term
Resolution is improved when
Definition
SID increases
Term
Which radiograph exhibits the best detail?
Definition
a PA chest radiograph for evaluation of the heart at 72in
Term
As focal spot size decreases,
a. unmbra is improved.
b. penumbra decreases
c. resolution increases
d.all of the above
Definition
d. all of the above
Term
Slow film-screen combinations:
Definition
increase resolution
Term
Resolution will increase as _____ increases.
Definition
phosphor concentration
Term
The best method for controlling motion when the patient is unable to cooperate is to:
Definition
maintain mAs, while decreasing time.
Term
As a last resort, which human immobilizer is used to hold a patient in position?
Definition
the male relative
Term
The_____ represents a depth to the information in the digital image:
Definition
z axis
Term
Which measures the accuracy of an image compared to the original object scale of 0 to 1?
Definition
modulation transfer function
Term
Calculate the penumbra for an image taken with a 1.0mm focal spot, at a 40" distance, and OID of 2".
Definition
P = 0.05
Term
Calculate the penumbra for an image taken with a 2.0mm focal spot, at a 40" distance, and OID of 2".
Definition
P= 0.105
Term
Calculate the penumbra for an image taken with a 1.0mm focal spot, at a 40" distance and OID of 5".
Definition
P= 0.14
Term
Calculate the penumbra for an image taken with a 2.0mm focal spot, at a 72" distance, and OID of 1".
Definition
= 0.028
Term
Calculate the penumbra for an image taken with a 2.0mm focal spot, at a 72" distance, and OID of 6".
Definition
= 0.1818
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