DBP:Harvard:Software:Minutes:8-9-06

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DTI Meeting Minutes | August 9, 2006


Present: Doug, Marc, Marek, Gordon, Sylvain, Katharina, Toshiro


Scanning Update:

  • 7 subjects were scanned yesterday. Biggest logistical hurdle is reconstruction time--holds up scanning for 25 minutes
  • Data is on the network, but needs to be assigned case numbers
  • Sylvain made tensors for the new cases
    • One case had FAT artifact, may be bad enough that we will have to bring the subject back
    • There is a bug in Slicer where the 3D view and the slice view are decoupled
    • 2 cases are sheared strangely--the oblique acquisition may be causing this, may be measurement frame.
  • Gordon suggested that we experiment with scanning a subject with head rotated at 45deg.
  • Also, if possible the scheme of gradient directions should be changed (need to talk to NanQuei)


DWI inspection for new data:

  • Gordon presented a method for inspecting sequences of DWIs to look for drops in signal or other artifacts. Baseline images and gradient images in a composite, cycling through slices to see abrupt changes in intensity.
  • With the new data, a lot of problems are obvious: zipper lines, dropped DWIs, uneven drops in intensity within a single DWI, motion artifacts, FAT artifact (shows up well in AvGradient image)
  • PNL can use this method to inspect every new DTI case that comes in