Dear all:
since image quality is one of the most important aspect for a reliable image processing and good results also in using the procedures of the FreeSurfer package, I would like to ask all collegues with sufficient expertise, which to their experience are the best MRI pulse sequences to use. We are using a Siemens Vision (1.5 Tesla) and tried the following: FLASH3D: TR = 30 ms TE = 5 ms flip angle = 40 Grad slice thickness = 1 mm matrix = 256 x 256 MPRAGE TE = 4.4 ms TR = 4.4 ms TI = 300 ms flip angle = 15 Grad slice thickness = 1.25 mm matrix = 200 x 256 Both give decent but not at all perfect images. Especially the segmentation step requires very good contrast at very low noise and no intensity gradients across the images. We experience that the created surfaces as checked with MEDIT or other image processing tools are very often not satisfactory and that a lot of manual editing is required, which in turn requires a good knowledge of anatomy ... Would be grateful for any help. Many thanks Uwe Pietrzyk -- Priv.-Doz. Dr. Uwe Pietrzyk Diplom-Physiker Institut für Medizin Forschungszentrum Jülich GmbH 52425 Jülich Tel: +49-2461-61 4763 Fax: +49-2461-61 2820 + 8229 Mobil: +49-172-213-2155 EMail: [EMAIL PROTECTED] http://www.fz-juelich.de/ime
