final review prep Flashcards
When an X-ray beam is filtered, photon quantity in the primary beam would be
decreased
The formula for magnification factor is
SID/SOD (SID divided by SOD)
A measurement between the source of the X-rays ( in the primary beam) and the image or IR is known as:
SID
To obtain minimum magnification, a technologist should:
position the object close to the image receptor
A foreshortened image:
results from an inclined object
Any misrepresentation of an anatomic structure that alters its size and / or shape defines:
distortion
smaller focal spot sizes cause
less blur (less geometric/inherent blur)
The greatest enemy of the sharpness of detail is
motion
To avoid shape distortion, which of the following must be paid close attention to?
Part angulation
What radiographic quality factor would be most affected by an excessive amount of geometric blur (focal spot blur)?
recorded detail
When proper radiographic detail cannot be obtained because of excessive OID, what change in technique may be use to improve the detail?
increase SID
Which of the following directly affects the degree of shape distortion in an image
- object thickness and shape
- angle of the object in relation to the film
- OID
- angle of the beam in relation to the object
- centering of the x-ray beam to the object
1,2, 4, and 5 only
Which of the following would not be included in the principal geometric factors affecting radiographic quality?
collimation
Which set of conditions will produce an image with the greatest magnification?
A. 20 inches SID, 1 inch OID
B. 40 inches SID, 3 inches OID
C. 50 inches SID, 5 inches OID
D. 72 inches SID, 5 inches OID
C. 50 inches SID, 5 inches OID
Which would provide the greatest detail in an x-ray image?
(1) Small focal spot
(2) Longer SID
1 and 2
With all other factors unchanged, if focal spot size is decreased, image magnification will
increase/decrease/not change at all
not change at all
With all other factors unchanged, if mAs is decreased, image magnification will:
increase/decrease/not change at all
not change at all
If the CR is off-centered to an object but there is still alignment with the anatomy/IR and CR, magnification will
increase/decrease/not change at all
not change at all
With all other factors unchanged, if the anatomy of interest is tilted in relation to the IR (and the IR remains parallel with the table/Bucky), image distortion will:
increase/decrease/not change at all
increase
T/F:
Foreshortening and elongation are examples of shape distortion
true
T/F: Recorded detail is a degree of sharpness on the radiograph.
true
T/F: to acquire greater detail you should use a small focal spot
true
T/F: typically there is always slight magnification on radiographic images
true
T/F: You can increase detail by increasing OID.
false