Regarding geometric unsharpness, which of the following is false?
A. Inversely proportional to focal spot size
B. Directly proportional to object-film distance.
C. Inversely proportional to focal spot-object distance.
D. Characterized by penumbra width.
查看答案
X-ray production occurs at the _____.
A. Cathode
B. anode
C. Filament
D. stator
When the anode angle is less than 45 degrees, _____.
A. the actual focal spot is smaller than the effective focal spot
B. the effective focal spot is smaller than the actual focal spot
C. the actual focal spot is equal to the effective focal spotthe angle has no effect on focal spot
The disadvantage of a small target angle is _____.
A. greater field coverage
B. more uniform radiographic density
C. increased heat distribution & capacity
D. greater anode heel effect
According to the Line-Focus Principle, the following factors are able to alter the size of focal spot EXCEPT______.
A. size of filament
B. anode angle
C. SID
D. electron beam size
微信支付 
支付宝支付