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1. During fluoroscopy the X-ray tube is operated at less than ___ ma -
ANSWER 5
2. Despite fluoroscopy having a lower MA the patient radiation dose is
considerably ________ during fluoroscopy than during radiographic
examinations because the X-ray beam exposes the patient continuously for
a considerably longer time - ANSWER Higher
3. Fluoroscopic equipment allows the radiologist to select an image
brightness level that is subsequently maintained automatically by varying
KVP, the MA or sometimes both. This feature of the fluoroscope is called
_______________ ______________ ___________ (ABC) - ANSWER
Automatic brightness control
4. The principal advantage of image intensified fluoroscopy is increases image
_______________ - ANSWER Brightness
5. Illumination levels are measured in units of lumen per square meter or
______ - ANSWER Lux
,6. It's importance lies in the wide range of illumination levels over which the
human eye is sensitive: this is the definition of what - ANSWER Lux
7. Radiographs are visualized under illumination levels of ______ to _______
lux - ANSWER 100; 1000
8. The structures in the eye that are responsible for the sensation of vision are
called ________ and __________ - ANSWER Rods; comes
9. Light incident on the eye must first pass through the _________ a
transparent protective covering and then through the lens, where the light
is focused into the retina - ANSWER Cornea
10. What behaves similarly to the diaphragm of the photographic camera in
controlling the amount of light that is admitted to the eye. In the presence
of bright light the iris contracts and allows only a small amount of light to
enter. (Between the cornea and lens) ~ dilates and allows more light to
enter~ - ANSWER Iris
11. When light arrives at the retina, it is detected by the rods and the
__________ - ANSWER Cones
12. Rods and cones are small structures; more then _____________ of them
are found per square millimeter of retina. - ANSWER 100,000
, 13. The cones are concentrated at the center of the retina in an area called
_________ __________ - ANSWER Fovea centralis
14. Rods are sensitive to low light levels and are stimulated during dim light
situations. Rod vision is approximately ___ lux - ANSWER 2
15. Cones are less sensitive to light and their threshold is approximately _____
lux - ANSWER 100
16. Cones are used primarily for daylight vision, called _____________
__________ - ANSWER Photopic vision
17. Ross are used for night vision called _____________ __________ -
ANSWER Scotopic vision
18. Cones have The ability perceived as fine detail is called __________
__________ - ANSWER Visual acuity
19. Cones are much better at detecting differences in brightness levels called
___________ ______________ - ANSWER Contrast perception
20. Cones perceive color and rods are essentially color _________ - ANSWER
Blind