General Review / Physics:

Question 1

T1 parameters:

Answer 1

TR < 800

TE < 30

Question 2

PD parameters:

Answer 2

TR > 1000

TE < 30

Question 3

T2 parameters:

Answer 3

TR > 2000

TE > 80

Question 4

Fast Spin Echo (FSE) T2 Parameters:

Answer 4

TR > 2000

TE > 60

Question 5

GRE T1

Answer 5

TR: variable
TE < 30
Flip angle 70-110

Question 6

GRE T2* parameters:

Answer 6

TR: variable
TE < 30
Flip angle 5-20

Question 7

STIR parameters:

Answer 7

TR > 2000
TE > 60
Flip angle 180 -> 90
Inversion time 120-170

Question 8

FLAIR parameters:

Answer 8

TR > 3000
TE > 80
Inversion time: 1700 - 2200.

Question 9

Sensitivity and Specificity:

Answer 9

“SPIN and SNOUT.”
SPIN stands for “SPecific tests rule IN the condition when they’re positive.”
SNOUT stands for “SeNsitive tests rule OUT the condition when they’re negative.”

Sensitivity = A / A + B
–> True +ve / (True +ve + false +ve)
Specificity = D / C + D
—> True -ve / (True -ve + false -ve)