Ch. 29 Distortion (Exp II) Flashcards
Distortion is a misrepresentation of…
Size and shape
Size distortion in radiography can be ____ only.
Magnification
Size distortion is controlled by…
- SID
- OID
- Radiographic distances
As size distortion decreases, the resolution of recorded detail….
Increases
The ____ the SID, the ____ the magnification.
Greater; smaller
Examinations of body parts with a large inherent OID warrant a ____ whenever possible.
Large SID
Which examination does not exhibit an inherently large OID?
a. AP lumbar spine
b. Lateral c-spine
c. Lateral chest
d. AP facial bones
a. AP lumbar spine
As OID increases and SID remains constant, entrance skin exposure (ESE)…
Increases
Large patients receive a greater exposure than small patients because their….
- SOD is decreased
- OID is increased
- Entrance skin surface is closer to the source
The magnification factor for a radiographic procedure is calculated at 1.25. It may be assumed that there is a ____ magnification of the object.
125%
What occurs when the tube or the image receptor is not properly aligned?
Elongation
What occurs when the part is not properly aligned?
Foreshortening
Proper alignment is achieved when the central ray is ____ to the part and ____ to the image receptor.
Perpendicular; perpendicular
When the position of the patient is reversed, the direction of the tube angle must be ____ to maintain the relationship.
Reversed
Because the x-ray beam is divergent,
Minification is impossible.
