Radiographic interpretation of the thorax Flashcards Preview

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Flashcards in Radiographic interpretation of the thorax Deck (20):
1

What diseases are you ruling in/out when taking a thoracic radiograph?

Common place to find cancer metastases
Respiratory dysfunction
Cardiac disease
Esophageal or swallowing disorders
Post-trauma, post-surgical

2

Why would you need to establish normalcy in a thoracic radiograph?

Pre-anesthesia
Base line

3

What are 5 general reasons to take a thoracic radiograph?

Cheap: 75-100$
Rapid results
Simple procedure
Information on multiple systems
Vast amount of info obtained

4

What are the minimum requirements of thoracic rads?

Two views that are orthagonal (90 degrees) to each other

5

What are the standard views of thoracic rads?

Left to right lateral (right lateral)
Dorsoventral (DV)
Right to left lateral (left lateral)
Ventrodorsal (VD)

6

T/F: There is a lot of inherent contrast (air) in thoracic rads

TRUE

7

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

8

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)
Adequate collimation

9

Radiographic positioning--lateral view

Thoracic limbs pulled forward
Avoid patient rotation
Include skin edges, thoracic inlet and diaphragm

10

Radiographic positioning--DV or VD view

Thoracic limbs pulled forward and to the side
Avoid patient rotation
Include thoracic inlet and diaphragm

11

Radiographic interpretation of the thorax

Evaluate technique
Signalment
Extra-thoracic (soft tissue, musculoskeletal, abdomen)
Intra-thoracic (systematic evaluation of thoracic structures)

12

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)

13

What is the most important finding on the radiograph?

Location of the lesion

14

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

15

Anatomic location often affects what 3 things?

Further diagnostic tests
Treatment options
Prognosis

16

What is seen on the right lateral view of the canine thorax?

R crus more cranial
CVC enters most cranial crus
Crura more parallel

17

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

18

T/F: Obesity and disease might also affect crura

TRUE

19

T/F: You should only use laterals in large animals (except foals)

TRUE

20

T/F: You should be able to capture the entire thorax of the horse with only one film

FALSE--it may take multiple (3-4) OVERLAPPING films to capture the entire thorax