Image basics

SNR

100

what is SNR

signal to noise ratio 

200

reducing bandwidth will do what to SNR

increase SNR

300

increase in FOV will do what to SNR

increase SNR

400

decreasing TR will do what to SNR

lower SNR

500

A sequence with 2 NEX, increased to 6 NEX would have an increase in SNR of what amount 

square root of 3

scan time formulas

100

what is the formula for spin echo 

TR*PHASE MATRIX*NEX 

* WHEN YOU GET THE ANSWER DIVIDE BY 1000 THEN DIVIDE THAT BY 60* FOR THIS SCAN TIMES

200

What is the formula for fast spin echo

TR*PHASE MATRIX* NEX -DIVIDED BY ETL

*WHEN YOU GET THE ANSWER DIVIDE BY 1000 THEN DO NOT DIVIDE THAT BY 60* FOR THIS SCAN TIMES

300

What is the formula for a gradient echo 2D

TR*PHASE MATRIX*NEX

400

What is the scan time formula for a gradient echo 3d acquisition 

TR*PHASE MATRIX*NEX*#SLICES

500

 Spin Echo Sequence with parameters 450 TR, 20 TE, 224 x 224 matrix, 20cm FOV and 3 NEX.  Your scan time would be

 450 x 224 x 3 = 302400 milliseconds. therefore your scan time would be 5 minutes and 2 seconds.