Film-Screen Imaging
.jpg)
1. Which of the following is the latent image centre for the radiographic film?
a) Phosphor layer
b) Polyester base
c) Detector element
d) Sensitivity speck
Ans:
D
2. Which of the following describes a film’s sensitivity to x-rays or light?
a) Gamma
b) Speed
c) Contrast
d) Latitude
Ans:
B
3. Intensifying screens are used to _______.
a) Decrease patient exposure
b) Increase recorded detail
c) Increase film latitude
d) Decrease contrast
Ans:
A
4. The ability to emit light only when stimulated by x-rays is known as _______.
a) Phosphorescence
b) Sensitometry
c) Conversion efficiency
d) Fluorescence
Ans:
D
5. What reducing agent acts slowly to produce the higher densities on a film radiograph?
a) Ammonium thiosulfate
b) Hydroquinone
c) Phenidone
d) Cesium iodide
Ans:
B
6. What chemical agent is responsible for clearing the unexposed silver halide crystals during film processing?
a) Ammonium thiosulfate
b) Hydroquinone
c) Phenidone
d) Cesium iodide
Ans:
A
7. Which automatic processing system primarily maintains the chemical activity level?
a) Replenishment
b) Standby control
c) Recirculation
d) Quality control
Ans:
A
8. Why is silver recovery necessary during film processing?
a) It is a natural resource.
b) It is toxic to the environment.
c) It has monetary value.
d) All of the above
Ans:
D
9. What term is defined as a measure of the amount of light transmitted through the film?
a) Sensitometry
b) Film contrast
c) Film speed
d) Optical density
Ans:
D
10. What is the diagnostic range of optical densities?
a) 0.15 to 4.0
b) 0.5 to 1.25
c) 0.5 to 2.0
d) 0.10 to 2.0
Ans:
C
11. A change of –––––––––––––––––––– in optical density results from a change in the percentage of light transmittance by a factor of 2.
a) 0.03
b) 0.3
c) 3.0
d) 30
Ans:
B
12. Changes in radiation exposure have the greatest effect on optical densities in which sensitometric region?
a) Toe
b) Shoulder
c) Straight-line
d) Toe and Shoulder
Ans:
C
13. When the exposure technique used produces densities outside the straight-line portion of a sensitometric curve, how was contrast affected?
a) Increased
b) No effect
c) Decreased
d) Improved
Ans:
C
14. Film B has an exposure speed point of 1.5, and Film A has an exposure speed point of 1.2. Is there a difference in speed?
a) Film A is twice as fast as Film
b) B. Film A and B have equal speed.
c) Film A is half as fast as Film B.
d) Film B is twice as fast as Film A
Ans:
A