Intro To Radiology Flashcards
What color are dense objects?
White, radio-opaque
What color are non-dense objects?
Black (transparent), radio-lucent
What are the structures on gray scale?
Air, fat, blood, muscle, bone, lead
Black White
What are dx imaging used for?
-localize an anatomic problem
-to ID the tissue involved
-to ID the nature of the tissue damage
-direct treatment
Types of imaging
X-ray, CT, MRI, ultrasound, nuclear imaging
What is x-ray?
Form of electromagnetic radiation
What is the primary value of routine radiography?
Documenting bony defects
How many and what type of views are used for dx radiology for musculoskeletal pathology?
-Minimum of two views perpendicular to each other
-Additional oblique views often considered
X-ray advantages and disadvantages
Advantages: quick, inexpensive, ideal for bony changes
Disadvantages: doesn’t show soft tissue changes, radiation exposure
What does CT scan stand for?
Computerized (axial) tomography
What is a CT scan?
Moving x-ray; provides detailed planar images by progressive visual
Advantages of CT
-cross sectional images
-can enhance w/ contrast
-better sensitivity than x-ray
-ok w/ metal
-fast
Disadvantages of CT
-high radiation exposure
-less sensitive than MRI
What does MRI stand for?
Magnetic resonance imaging
What is MRI used for?
No radiation involved and ideal for soft tissue contrasts