View source for Mbirn: Calibration Code developments

'''Updates'''

* '''May 17, 2005''' (S. Mori)
** Gradient non-linearity distortion correction: JHU phantom scans completed
*** 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.
*** Philips doesn't use gradient linearity compensation for post-processing for the 1.5T scanner (4G/cm system).
*** 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.
*** I'll measure the linearity in the 3T system after ISMRM.
*** This data will be uploaded to the SRB using JHU's rack, and then inspected at MGH to assess the degree of distortions.

* '''Jan 20, 2005''' (J. Jovicich)
** 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.

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