DBP:Harvard:Software:Minutes:8

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