Radiology Flashcards
What are routine views of the canine/feline carpus?
lateral and dorsopalmar
What are additonal views of the canine/feline carpus?
lateral flexed, medial oblique, lateral oblique, stressed, lateral horizontal beam
Which view of the canine/feline carpus are comparisons common?
lateral flexed
Which view of the canine/feline carpus is weight bearing?
lateral horizontal beam
When looking at the lateral view of the carpus, which leg is closest to the cassette?
the affected limb
Why are oblique views helpful?
some injuries are difficult to detect radiologically on the standard projections
What is often very helpful for obtaining quality radiographs of the vertebral column?
heavy sedation or general anesthesia
What can happen if taking radiographs made without anesthesia of the cervical vertebrae?
false narrowing of the intervertebral disc spaces can result from muscle spasm and poor positioning
Why is a grid always used to increase the detail and contrast of the radiograph when doing cervical vertebrae radiographs?
the patient is anesthetized and motion is not usually a factor
How many vertebrae should you collimate down to per x-ray? Why?
3-4. To avoid distortion and false narrowing of the vertebral spaces.
What are routine views of the canine/feline cervical vertebrae?
lateral and VD view
What are additional views of canine/feline vertebrae?
flexed lateral and extended laterals, lateral obliques, DV, open mouth VD
What is the purpose of a lateral oblique view of the cervical vertebrae?
localize a lesion observed on the lateral and/or VD projection
What are advantages of intraoral film?
small, flexible, inexpensive
Why does intraoral film have a foil backing?
to absorb exit radiation and reduce back scatter and scatter
Direct exposure film is mainly used for what?
extremeties, dental, avian, small exotics or dental radiographs where high detail is needed
What is an overbite?
upper jaw longer than lower jaw
What is an underbite?
lower teeth longer (protrudes) in front of upper jaw (teeth)
Teeth that are mobile should always be _______.
radiographed
Should you do dental radiographs before and after extractions?
yes
Open mouth lateral dental views are used to what?
evaluate the dental arcade and jaw structures
How do you keep upper and lower arcades away from each other?
use radiolucent mouth gag/speculum
When taking a mandible x-ray, how should the patient be placed?
dorsal recumbency with front limbs extended caudally
What can LVTs NOT do when it comes to dentals?
no removal of multi rooted teeth in small animals, no removal of any equine teeth, no root canals
What are the three basic components of a dental x-ray machine?
x-ray tube head, adjustable arm, control panel
The tube head is what?
where the anode and cathode are located and is where the x-rays are produced
Where is the anode and cathode located?
tube head
What does PID stand for?
positioning indicating device
What does the PID do?
helps collimate the x-rays and provide less scatter radiation while the image is being produced
What are the 3 types of imagine receptors in veterinary medicine?
film, digital, phosphor plates
What type film is most commonly used in vet med?
D
What are advantages of the phosphor plates over DR?
ease of use, versatility, multiple plate sizes available, no cord to limit movement, easier to place in mouth
What are advatnages of phosphor plates over film?
no chemicals as with film, faster than developing manually or even with autoprocessor
A dental study calls for a minimum of how many views?
8-12
What two techniques are used for dental radiographs?
parallel, bisecting angle
The parallel technique is used to obtain images of the what?
mandibular fourth pre-molars and molar teeth in dogs/cats
How do you correct foreshortening?
increasing the angle between the sensor and the beam
What are routine views of a femur radiograph?
lateral, craniocaudal (AP) (VD extended)
What are alternative views of a femur radiograph?
cross table projection or horizontal beam view
When taking a femur radiograph, what leg is closest to the cassette?
affected limb
What should the field of view in a femur radiograph contain?
hipjoint, femur, stifle joint
The femur not running parallel can cause what?
foreshortening of the limb
When x-raying the lumbar vertebrae, how many vertebrae should you collimate to?
2-3
What are routine views of the metatarsus-phalanges?
lateral, dorsoplantar or plantardorsal
What are standard views of the canine/feline stifle joint?
medial lateral lateral, caudocranial
What are alternative views of the canine/feline stifle joint?
craniocaudal, skyline projection of patella
What are routine views of the canine/feline tarsus?
lateral, platarodorsal
What is an alternate view of the canine/feline tarsus?
dorsoplantar
What are routine views of thorax radiographs?
right lateral, left lateral, DV and VD
What are alternative views of thorax radiographs?
horizontal beam, lateral, VD, DV
What is the field of view on thorax radiographs?
thoracic inlet to diaphragm (8th-13th rib)
With thorax radiographs, why is it important to extend the forelegs cranially?
so the heart can be seen
When should you use a grid?
if area is over 10cm
For good visualization of internal soft tissue structures, you should have ___ kvp and ____ mas.
high, low
When taking a thorax radiograph, where should you center the beam?
at the heart (6th rib)
When taking a thorax radiograph, when should you take the radiograph?
at peak respiration to allow complete visualizaton of lung tissue
What is the preferred view for pneumothorax?
DV
What is the recommended view for evaluating lung fields?
VD
What is the best view for viewing the accessory lung lobes?
VD
What thorax view is contraindicated for animals in respiratory distress?
VDd
Which lateral view (R or L) gives a more accurate view of cardiac silhouette?
right
What thorax view is used to confirm presence of fluid or free air in thoracic cavity?
standing lateral horizontal beam
What are routine views for tibia/fibula radiographs?
lateral, caudocranial
Which side of the limb is a marker usually placed on for a tibia/fibula x-ray?
cranial
What are the two primary computerized imaging choices?
converted radiography (CR) or direct digital radiography (DR)
With the CR, how long do you have to scan the plate?
24 hours
What are the two basic categories of contrast media?
positive and negative
What are the routes of administering contrast media?
IV, orally, urinary catheter, enema
What is the most commonly used negative contrast agent?
air
Negative contrast agents appear what?
radiolucent (dark colored)
Examples of negative contrast agents.
air, oxygen, carbon dioxide, carbonated beverages
Which negative contrast agent is more likely to cause an embolism?
air
Which negative contrast agent is a fire hazard?
oxygen
What studies are negative contrast agents used for?
stomach, upper and lower GI, bladder
How are negative contrast agents administered?
stomach tube, enema, urinary catheter
What are the two major types of positive contrast agents?
barium sulfate, iodine compound
What are the two types of iodine compound contrast agents?
water-soluble, viscous/oily agents
Positive contrast agents appear as what?
radiopaque (appear white)
What are positive contrast agents used for?
to fill or outline a hollow organ, injected into blood vessels
What studies are positive contrast agents used for?
stomach, GI tract, urinary bladder, excretion evaluation, vascular supply
What is the most commonly used positive contrast agent?
barium sulfate
What is the contrast agent of choice to visualize foreign bodies?
barium sulfate
Which positive contrast agent is never administered IV?
barium
What positive contrast agent do you want to avoid if you suspect a rupture?
barium
How is barium administered?
orally, stomach tube, enema
What happens if barium is accidentally aspirated into the trachea?
usually cleared by coughing, if reaches the small bronci and alveoli, can result in drowning
What is radiopaque iodine excreted by?
the kidneys
If you use radiopaque iodine in dehydrated patients, what does it do?
increases dehydration
Which iodine cannot be administered intravascular?
oily/viscous iodine
What is a double contrast study?
uses both negative and positive contrast media
What is a common combination for a double contrast study?
barium and air
A double contrast study provides what?
a good distention, optimal mucosal detail
What does a double contrast study avoid?
masking small anomalies by large volume of positive-contrast media
What contrast studies are included in the GI section?
esophagus, stomach, small intestine, large intestine, gall bladder
What is an esophography also known as?
barium swallow
what is a barium swallow also known as?
esophography
What does a barium swallow look at?
function and morphology
What does a gastrography look at?
stomach - size, shape, position, foreign objects and morphology