Fast field echo

Fig. 13.7a-d. Giant UPJ obstruction. 3rd trimester, a Transverse scan of the fetal abdomen. The renal pelvis (36 mm between the crosses) is markedly dilated, b Sagittal scan of the dilated left fetal kidney. The crosses measure the remaining parenchyma. Ch, fetal chest, c Fetal MR imaging. Balanced fast field echo-sequence (Balanced FFE). Frontal view showing the important left urinary tract dilatation, d Neonatal US. Transverse scan left kidney. The diameter of the pelvis (between crosses) is 22 mm... 

Fig. 5. Standard fast spin-echo imaging of the pelvis and the lower leg. Typical contrasts between musculature and other tissues are demonstrated. Bl = bladder, Fe = femur. Gluteus = gluteus muscle. Original recording parameters matrix 192 x 256, slice thickness 6 mm, a-c field of view (fov) = 380 mm, d-f fov = 180 mm. (a) and (d) Proton density weighting TR = 5000 ms, TE = 12 ms. (b) and (e) Ti-weighting TR = 500 ms, TE = 12 ms. (c) and (f) 7 2-weighting TR = 5000 ms, TE = 100 ms.

Electrodes are left externalized to confirm their position by MRI. Scans are performed using 1.5 T Edge equipment software version 9.3 (Marconi Medical Systems, Cleveland, Ohio), using T2 weighted fast spin echo sequence (echo time 11 ms repetition time 4070 msec field of view 16.0 cm 256 x 256 matrix). Sections are oriented parallel and perpendicular to the AC-PC line for axial and frontal views, and parallel to the midsagittal plane for sagittal sections [Velasco et al, 2000b, 2002]. 

Tkach J, Haacke E (1988) A comparison of fast spin echo and gradient field echo sequences. Magn Reson Imaging 6 373-389... 

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