Radiography Flashcards
What is fluoroscopy?
A radiograph taken in real time
What makes a radiograph a superimposition?
Cannot determine depth of the image
What color is produced if a lot of x-rays reach the film?
Black
What is the order of tissue radio-opacity?
Metal > Bone > Soft Tissue > Fuid > Fat > Gas
What is the order of image density?
Metal < Bone < Soft Tissue < Fluid < Fat < Gas
Why does fat appear lighter than air?
It is more dense
Why are x-ray films placed into cassettes?
A lot of photons are needed to create an image on film alone, cassette decreases the amount of photons needed to produce an image (More safe)
If the x-ray beam is uneven to the film cassette, which distortion will occur?
Magnification Distortion
If two x-ray beams overlap while taking the image, which distortion will occur?
Summation
How is a projection named?
The side the animal is laying on, the direction of the beam’s path
What is the Compton Effect and how can it be stopped?
Scatter of photons when an x-ray is taken, need 1” thick lead or double brick barrier to stop photons reaching human
How are radiographs placed on a viewer?
Head to the left, right of animal on our left (As if facing us while lying on its back)
What is ultrasound?
High frequency sound wave that is projected at an object, and the resulting waves are read to indicate shape/presence
What is contained in a transducer/probe of an ultrasound machine?
Piezo-electric crystals
How is a signal transmitted from the transducer through the body?
Electric current causes Piezo-electric crystals to expand and contract, which lets of a sound wave. The sound wave permeates through tissue and is sent back, which is recorded once again through the expansion and contraction of the Piezo-electric crystals.
