The II and the eye Flashcards
During conventional fluoro systems: Once light leaves the output phosphor it is coupled to a TV camera system through either:
- Fiber optic cable
(old system) - Lens Coupling
Name 2 characteristics of Fiber optic cables
- compact
2. Durable
Name characteristics of the lens optic coupling
- Large
- Fragile
- Has beam splitting mirror
____ are images taken to document a patient’s anatomy at specific moments during the exam
spot films
What is the purpose of a beam splitting mirror
Allows 10 % of light beam to go to TV camera
and 90% of light beam to the ancillary film camera
List the 4 main components of cinefluorography
- Synchronization
- Framing frequency
- F-number of the optical system
- Framing and patient radiation dose
___ is the number of frames per second (f/s).
framing frequency
____ is the focal length/lens diameter
F-number
( lower the f # , the more light will reach imaging plane and faster the lens) = less exposure to the patient
Why must the x-ray beam be restricted to match the framing method
area of the pt. are exposed but the image is never recorded
What type of framing should be avoided
underframing:
Fluoro image < frame
Which framing results in no part of image being lost by 58% of film is used
Exact framing:
Diameter of the intensifier image & the smallest dimension of the cine frame are the same
Which framing results in part of the image is lost
Overframing
Which framing results in all of the film being used but 39% of image is wasted
Total overframing
What is a disadvantage of video tape recording
Video does not exhibit high resolution
What does ABS stand for and what does it do
Automatic brightness stabilizer
aka: ABC
