Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
11 Cards in this Set
- Front
- Back
|
What does the magic angle refer to?
|
A bright artifact on the MRI that may appear to be real pathology
|
|
|
What is the typical value of the magic angle?
|
55 degrees
|
|
|
What MRI sequence does the magic angle affect?
|
T1
|
|
|
What is the repeat time for T1-weighted images?
|
<1000 msec
|
|
|
What is the repeat time for T2-weighted images?
|
> or equal to 1000 msec
|
|
|
What MRI study is preferred for diagnosing a recurrent disk herniation? Why?
|
MRI with gadolinium
Gadolinium highlights scar tissue on T1 -weighted images |
|
|
What two MRI sequences best demonstrate marrow edema?
|
Short tau inversion recovery (STIR)
Fat-suppressed T2 |
|
|
Why does osteonecrosis appear black on T1-weighted images?
|
Because fatty marrow cells have been destroyed
|
|
|
How does acute or rapid flowing blood appear on T1? T2?
|
Dark on T1
Dark on T2 |
|
|
What is the MRI appearance of chronic or slow flowing blood on T1? T2?
|
Bright on T1
Bright on T2 |
|
|
What two advantages does multidetector CT provide over MRI?
|
Improved resolution along
longitudinal axis Decreased metal artifact |
