Quiz 1 Flashcards
The patient demographic requirements for radiographic images include all of the following except
technologist’s identification.
Which of the following is true about image markers?
- They are entirely radiopaque.
- They should be reversed before being placed on the IR.
- They should be positioned as close to the median plane as possible.
- They will be magnified if positioned on the imaging table or patient.
4 only
What is the marker placement for the projection of PA cranium?
laterally on the side being identified
Elongation occurs in all of the following situations except when the
central ray and IR are perpendicular and the part is angled.
For an open joint space to be obtained, the central ray must be aligned _____ to the joint.
parallel
When the central ray is angled, the structure situated _____ is projected the most.
farther away from the IR
Three images were obtained on the same structure with a computed radiography system.
Image 1 was obtained using a 48-inch source–image receptor distance (SID) and a 5-inch object–image receptor distance (OID);
image 2 was obtained using a 48-inch SID and a 3-inch OID;
image 3 was obtained with a 48-inch SID, a 3-inch OID, and a larger IR.
Which image will demonstrate the sharpest recorded detail?
Image 2
A small focal spot should be used for each of the following situations except when
the milliamperage setting is above 300.
An image demonstrating motion and adequate density was obtained using 100 mA at 0.5 seconds. If the time is changed to 0.25 seconds, what mA should be used to maintain density?
200 mA
Minimizing size distortion is accomplished by which of the following?
- Using the longest feasible SID
- Using the shortest possible OID
- Increasing the angle of the CR
- Placing the part as close to the IR as possible
1,2 and 4 only
True or False :The quality of spatial resolution of a digital imaging system is mainly defined by
- the size of the matrix.
- the size of the pixel within the matrix.
True
What is the location on a histogram graph of air/gas?
Right
What is the location on a histogram graph of bone?
Left
What is the location on a histogram graph of soft tissue?
Center
All of the following are guidelines for producing optimal image histograms except
A -choose the correct body part and projection from the workstation menu.
B -leave minimal background in the exposure field through tight collimation.
C -use the smallest possible IR and cover at least 50% of it.
D -erase the imaging plate if the IR has not been used for a few days.
C
When is the examination or body part selected when using the DR system?
Before the radiation exposure
Which of the following CR cassette sizes will provide the greatest recorded detail?
8 ´ 10 inch
Saturation indicates
overexposure of the IR.
When an image resembles a double exposure, the type of artifact demonstrated is a(n) _____ artifact.
phantom image
Histogram analysis errors for direct digital systems include all of the following except
A-off-centered CR.
B-wrong part selection from the workstation menu.
C-collimation within 0.5 inch (2.5 cm) of the skin line.
D-exposure of less than 30% of the IR.
D
Which of the following patient conditions demonstrates high subject contrast?
Dense bones
Which of the following patient conditions demonstrates low subject contrast?
High fat content
Which of the following patient conditions demonstrates high subject contrast?
Dense bones
If a projection does not differentiate the densest and thickest structures in the VOI, adjusting the _____ is necessitated.
kVp
