https://www.na-mic.org/w/index.php?action=history&feed=atom&title=Mbirn%3A_Calibration_Code_developments 2026-05-26T13:51:28Z Revision history for this page on the wiki MediaWiki 1.33.0 https://www.na-mic.org/w/index.php?title=Mbirn:_Calibration_Code_developments&diff=3487&oldid=prev 2006-12-18T13:23:40Z

<p>Update from Wiki</p> <p><b>New page</b></p><div>'''Updates'''<br /> <br /> * '''May 17, 2005''' (S. Mori)<br /> ** Gradient non-linearity distortion correction: JHU phantom scans completed<br /> *** Philips scanner has two setting of gradient performance. One is rapid / low strength and the other is slow / high strength. Measurements were done in both modes.<br /> *** Philips doesn't use gradient linearity compensation for post-processing for the 1.5T scanner (4G/cm system).<br /> *** Philips' new gradient system (8G/cm) system in 3T does use linearity correction. I talked with a Philips person about the disclosure of the linearity information but I couldn't get clear answer about it.<br /> *** I'll measure the linearity in the 3T system after ISMRM.<br /> *** This data will be uploaded to the SRB using JHU's rack, and then inspected at MGH to assess the degree of distortions.<br /> <br /> * '''Jan 20, 2005''' (J. Jovicich)<br /> ** Gradient non-linearity distortion correction: S. Czanner extended the gradient unwarping code to operate on Siemens Avanto (1.5T). He is currently re-writting the matlab scripts so that we can have a stand-alone that can be distributed without proprietory information. This version will take as input the vendor-specific information that we use for the correction.<br /> <br /> ----</div>

Andy