Final Flashcards
Where does radiation exposure come from?
scatter radiation
x-ray tube head ?
X-ray are a form of
electromagnetic radiation
What is the majority of energy produced in the x-ray tube
heat
The anode consists of a
tungsten target
The cathode provides
electrons
Rotating anodes cause an increase intensity of the x-ray beam on the cathode side. This is called
heel effect
electron
particle that is negatively charged and travels around the center of an atom
frequency
number of cycles of the wave that pass a stationary point per second
wavelength
distance between 2 consecutive corresponding points on a wave
Why is it important that x-rays are created in a vacuum
prevent dust particles from interfering in production
What does milliamperage (mA) control
Number of electrons boiled off
degree of blackness
number of x-ray produced
What does kilovoltage peak control
penetrating power
degree of contrast
shades of gray
Select all the tissues that are particularly susceptible to radiation damage
Skin
Blood
The best place to wear your dosimeter badge is under you lead apron during radiograph procedures
False
What is the MPD for occupationally exposed people
5 REM
What is not part of proper protective apparel
lab coat
An overexposed film will be to light
False
Which is not a physical property of x-rays
x-ray travel in a wave
The purpose of a grid is to
absorb scatter and non-image forming x-rays
Order the density of the following tissues from the least dense (1) to the most dense (5)
- Air
- Fat
- Water/muscle
- Bone
- Metal
As the focal film distance decreases, the intensity of the x-ray increases. This rule is called
inverse square law
The grid is located between the x-ray tube and the patient
False
Which is a contraindication of using barium for GI studies
suspected perforation of GI tract
To produce good quality radiographs of the thorax and abdomen, you need ___ contrast
low
bisecting
beam is projected at a right angle to an imaginary line that cuts in half the angle formed by the place of the film and the long axis of the tooth
parallel
beam is projected at a right angle to the film and long axis of the tooth
Which way should the tube head be directed. if excessive elongation occurs with dental x-rays
more toward the sensor
What is the goal for dental imaging
get a complete image of the root
Anechoic
no echo are returned to the transducer resulting in a black image
Hyperechoic
echoes produced are brighter than the surrounding tissue
Hypoechoic
a few echoes are detected and the area is low level gray compared with adjacent tissues
What causes acoustic shadowing? Interaction of sound waves with …
Bone
Technetium 99m used in nuclear scintigraphy has a long half life, therefore animals are usually released after 5-6 days post administration of drug.
false
Ultrasound examinations of the equine primarily below the carpus/tarsus
False
Depth
allows you to put the patient area of interest in the biggest part of the image
Gain
affects the brightness of the image
Time-gain compensation
allows you to change gain in the near, far or entire image
which rang of frequencies are used for most small animal ultrasound procedures
2-15 mHz
Comet tail
sound waves interacting with metal objects
Distance enhancement
sound beam travels through a fluid-filled structure
Reverberation
repeated back and forth reflection of sound waves between two highly reflective surfaces
Which type of image receptor captures the distribution of the radioactivity of a radiopharmaceutical injection with gamma-ray camera
nuclear scintigraphy
What special imaging unit is used to identify and irradiate abnormal thyroid tissues in cats
nuclear medicine
Which is the most common indication form nuclear bone scan
lameness that cannot be localized
Fluoroscopy produces an continuous image
True
Select all the uses of fluoroscopy units
swallowing
heart
vascular studies
Which of the following materials does not require special handling following injection of Technetium-99
Hair
Any anesthesia machine can be used with performing an MRI
Falsse
A high frequency probe produces better resolution and detail images than a low frequency probe
True
