Fast high resolution MR-guided arthrography using iPAT
Markus Braun M.D., Jan Becker
Bochum, Grönemeyer Institut, Germany | 2007-05-31
The shoulder arthrography is done in prone position. The flex-loop-large coil is positioned above the affected shoulder and is tightly fixed by belts on the patient table. A nitro capsule is stuck to the patient's skin at the potential puncture spot of the needle. The nitro capsule shows a high MRI signal and serves as an orientation marker. The laser positioning line is placed on the nitro capsule marking the transversal slice.
The following sequences were used for the MRI guided needle placement.
1. T1-Flash-axial (Fig. 1a): TR = 207 ms, TE = 4,88 ms, Slices = 19, Slice thickness = 3 mm, FOV = 261x380 mm,
Matrix = 352x512i, TA = 38 sec.
2. T1-Flash-axial-iPAT (Fig. 1b): TR = 212 ms, TE =4,88 ms, Slices = 19, Slice thickness = 3 mm, FOV = 267x400 mm, Matrix = 512x768i, TA = 31 sec, Ref. Lines = 24.
3. T1-Flash-sag-iPAT (Fig. 2): TR = 250 ms, TE = 5 ms, Slices = 19, Slice thickness = 4 mm, FOV = 206 x 300 mm,
Matrix = 352x512i, TA = 27 sec., Ref. lines = 24.
Scanner and Software
The measurements were performed using a 1.5 Tesla magnet resonance tomography system (MAGNETOM Symphony with quantum gradients, Siemens AG, Medical Solutions, Erlangen). The system is equipped with the syngo version 2004A.