Test 1 Flashcards
mAs controls what?
quantity of electrons that are produced in the cathode
kVp controls what?
the acceleration and penetration power
what is density?
the degree of blackness on a radiograph
A radiograph that has many black areas and is dark when viewed has?
High density
what is contrast?
The visible difference between 2 adjacent radiographic densities.
what is a common radiographic position we use in vet med for thoracic and abdomen radiographs?
DV, lateral
what is a common radiographic position we use in vet med for proximal limbs?
lateral
what is a common radiographic position we use in vet med for paws?
lateral, dorsal palmar, dorsal plantar
When the beam enters the most cranial surface first and exits through the caudal surface it is called?
craniocaudal
When the beam enters the most caudal surface first and exits through the cranial surface it is called?
caudocranial
During an exposure, electrons in the x-ray tube travel from the…
cathode to the anode
when radiographing a long bond it is important to?
include the joint proximal and the joint distal
The minimum age for a person to be involved in radiographic procedures is?
18
the acceleration of the electrons and their ultimate striking energy is determined by the…
kilovoltage (kVp)
How does kVp affect the electrons and the x-ray beam?
Increasing it increases the speed at which electrons are pulled across to the anode and also increases the penetrating power of the x-ray beam.
When is it permissible to have a part of your body to the primary beam during an x-ray procedure?
Never. You should not expose any part of your body to the primary beam
A radiation film badge worn at the collar level, why?
monitors exposure of the thyroid gland and lenses of the eyes
the imaging technique that involves a piezoelectric crystal within a transducer is?
ultrasound
Regarding ultrasound, a under filled bladder is usually best classified as?
Anechoic
The ultrasound term the refers to few echoes detected, and the area is a low-level gray compared with the surrounding tissue is?
hypoechoic
In ultrasonography, what term refers to tissue that reflects more sound back to the transducer than the sounding tissues?
hyperechoic
at what level should the x-ray beam be centred for a radiographic exam of the cervical spine?
C3 - C4
how often should chemical (drug), restraint be used during radiologic procedures?
as often as possible
what involves non ionizing radiation to create the image?
MRI
what is the term used to describe an x-ray study that involves injection of a dye into the spinal column?
myelogram
what device offers technicians the least protection from x-radiation?
dosimeter badge
when radiographing a dorsopalmar view of an animals limb the primary beam enters _____ of the paw and exits through the _____.
dorsal aspect, palmar aspect
what absorbs the most x-rays?
metal
A bullet fragment on a film appears as a?
white mark
the tungsten plate (target) is located where on the x-ray machine?
anode
as the wavelength of x-ray photons shortens, the energy of the x-ray beam will?
increase
If a radiograph appears overexposed, is it too light or too dark? would you increase or decrease the exposure to improve the quality?
Too dark, exposure should be decreased
if a radiograph is too light, and the image appears underpenetrated, you should?
Increase kVp 10%-15%
when positioning an animal for radiographs, it is best to place the thicker portion of the patient toward ____ of the tube to produce a radiograph with uniform density.
The center
What land marks should be included when radiographing the humerus?
proximal landmark, shoulder joint, distal landmark, elbow
The minimum standard of lead equivalent for protective aprons and gloves is?
0.25mm
abdominal radiographs are taken when the…
Animal exhales
when can you x-ray a pregnant animal?
55 days
when can you ultrasound a pregnant animal?
20-32 days
