Flashcards in Radiographic interpretation of the thorax Deck (20):
What diseases are you ruling in/out when taking a thoracic radiograph?
Common place to find cancer metastases
Esophageal or swallowing disorders
Why would you need to establish normalcy in a thoracic radiograph?
What are 5 general reasons to take a thoracic radiograph?
Information on multiple systems
Vast amount of info obtained
What are the minimum requirements of thoracic rads?
Two views that are orthagonal (90 degrees) to each other
What are the standard views of thoracic rads?
Left to right lateral (right lateral)
Right to left lateral (left lateral)
T/F: There is a lot of inherent contrast (air) in thoracic rads
What is the long scale contrast needed with thoracic rads?
High kVp and low mAs with film
Maximizes the latitude of contrast
Choose the highest mA and the shortest time to minimize motion artifact
What are 4 techniques important for thoracic rads?
A lot of inherent contrast (air)
Long scale contrast
Inspiratory radiographs (take at the end of respiratory phase to avoid motion artifacts)
Radiographic positioning--lateral view
Thoracic limbs pulled forward
Avoid patient rotation
Include skin edges, thoracic inlet and diaphragm
Radiographic positioning--DV or VD view
Thoracic limbs pulled forward and to the side
Avoid patient rotation
Include thoracic inlet and diaphragm
Radiographic interpretation of the thorax
Extra-thoracic (soft tissue, musculoskeletal, abdomen)
Intra-thoracic (systematic evaluation of thoracic structures)
When identifying radiographic signs (aka lesions), what are 3 important steps?
Organ vs. area approach
Note any changes from normal...lesion
Assemble a basic description of the lesion (appearance, opacity, location, surroundings, size, prioritize)
What is the most important finding on the radiograph?
Location of the lesion
When locating the abnormality, what 2 ways can you describe its location?
Specific--left atrium, 3rd left rib, etc.
General--cranial portion of the thorax
Anatomic location often affects what 3 things?
Further diagnostic tests
What is seen on the right lateral view of the canine thorax?
R crus more cranial
CVC enters most cranial crus
Crura more parallel
What is seen on the left lateral view of the canine thorax?
L crus more cranial
CVC crosses over cranial crus and enters caudal one
Crura are divergent
Fundus of stomach caudal to L crus
T/F: Obesity and disease might also affect crura
T/F: You should only use laterals in large animals (except foals)