https://www.na-mic.org/w/index.php?action=history&feed=atom&title=MBIRN%3A_structural_calibration_dissemination-Acquisition_Protocols 2026-04-17T22:14:49Z Revision history for this page on the wiki MediaWiki 1.33.0 https://www.na-mic.org/w/index.php?title=MBIRN:_structural_calibration_dissemination-Acquisition_Protocols&diff=4651&oldid=prev 2006-12-18T19:27:04Z

<p>Update from Wiki</p> <p><b>New page</b></p><div>* '''Overview of dissemination contents'''<br /> ** Multi-site phantom data: phantom that helps asses image distortions from gradient non-linearities<br /> ** Multi-site human data: healthy volunteers, most of which were scanned twice at the participating sites<br /> ** Human Protocol: multi-spectral 3D structural (FLASH with multiple flip angles: 30, 20, 5, 3 degrees)<br /> ** Sites: Five sites with different 1.5T systems (Siemens, GE, Philips/Picker)<br /> <br /> &lt;br /&gt;<br /> <br /> * '''Human Acquisition Protocol'''<br /> <br /> Sequence: 3D spoiled gradient echo (FLASH type)<br /> Vendor's standard birdcage RF coil<br /> Slice orientation: Sagittal<br /> No partial Fourier<br /> NEX=1<br /> FOV= 25cm<br /> Phase matrix=192<br /> Readout matrix=256<br /> Number of Slices: 124 (no skip, whole head coverage, avoid wrap around)<br /> Slice Thickness: 1.3mm-1.5mm<br /> TE= minimum allowed with centered (symmetric) echo.<br /> TR=20 ms<br /> Slab Selection: No (i.e., hard RF pulses)<br /> scan 1: flip angle 30 degrees (T1-weighted image)<br /> scan 2: flip angle 5 degrees (proton-density-weighted image)<br /> scan 3: flip angle 20 degrees (T1-weighted image)<br /> scan 4: flip angle 3 degrees (proton-density-weighted image)<br /> Acquisition time per scan: about 8min 12sec<br /> <br /> &lt;br /&gt;<br /> <br /> * '''Phantom Acquisition Protocol'''<br /> <br /> Sequence: 3D spoiled gradient echo (FLASH type)<br /> Vendor's standard birdcage RF coil<br /> Slice orientation: Sagittal<br /> No partial Fourier<br /> NEX=1<br /> FOV= 40cm<br /> Phase matrix=192<br /> Readout matrix=256<br /> Number of Slices: 124 (no skip, whole phantom coverage, avoid wrap around)<br /> Slice Thickness: 2 mm<br /> TE= minimum allowed with centered (symmetric) echo.<br /> TR=20 ms<br /> Slab Selection: No (i.e., hard RF pulses)<br /> scan 1: flip angle 30 degrees without vendor's distortion correction<br /> scan 2: flip angle 30 degrees with vendor's distortion correction (if available)<br /> Acquisition time per scan: about 8min 12sec<br /> <br /> &lt;br /&gt;<br /> <br /> ----<br /> <br /> Back to: [[Mbirn:_Structural_MRI_calibration_data_dissemination|Mbirn: Structural MRI calibration data dissemination]]&lt;br /&gt; Back to [[Mbirn:Main_Page|Mbirn:Main_Page]]</div>

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