[Announcements] About gradient table and oblique planes

[susumu]

Dear DtiStudio/MriStudio users,

 

Thank you for using our software. Recently, I got a question about issue of
gradient table and oblique plane. We have been trying to forward this
message several times. I want to reiterate because this is very important
issue; PLEASE BE CAREFUL WHEN YOU ARE USING OBLIQUE IMAGING.

 

If you are using GE or latest Siemens operating system, you can forget about
this message.

If you are using Philips and are using "overplus" option "off", you can
forget about this message too.

 

If you are using Philips and "overplus = on" or Siemens with older operating
system, you are affected.

 

This issue is, YOU HAVE TO RECALCULATE GRADIENT TABLE BASED ON THE OBLIQUE
ANGLES because the gradient table is not dynamically rotated with the
imaging planes.

 

If you are using Siemens + Dicom/Mosaic, you need to check "Rotate gradients
if applicable" box before you load the images. This automatically load
oblique info and recalculate the table.

If you are using Philips, Jonathan Farrell made a nice software to
recalculate and create a new table in the DtiStudio format. You can get it
from
http://godzilla.kennedykrieger.org/~jfarrell/software_web.htm#DTI_gradient_t
able_creator.

 

Either way, it is a good idea to scan the same person twice; one with
non-oblique and the other with severe oblique, process the data, and do
fiber tracking to see everything is calculated correctly. You never know
when scanner companies change something important.

 

Please let me know if you have any questions.

 

Sincerely,

 

Susumu Mori

 

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