FYS-KJM 4740
FYS-KJM 4740
MR LAB Place: The Intervention Centre, Rikshospitalet.
1. Get to know the MR scanner. Security aspects.
2. Scanning of phantom
A. Aim: estimate T1relaxation times using two different methods
I. 2D (single slice) acquisition of phantom using a T1-GRE sequence (spoiled GRE) (TR/TE = 20 ms/2 ms). Change flip angle from 5 deg to 90 deg (keeping all other parameters constant). Measure signal intensity (SI) in each compartment of the phantom (see arrows on image below) as function of flip angle. From the resulting SI vs flip angle curves, estimated the T1-relaxation time in each compartment (hint: estimated max SI from the curves).
II. Find expression for T1 as function of SI, flip angle and TR measured at TWO different flip angles (hint, use ratio of SI; assume TR/T1 ................
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