[Mristudio-users] imported ROIs are flipped from front to back of brain

[susumu]

The default setting of Analyze follows the Neurology convention: the image's
right is the patient's right. MriStudio follows the Radiology convention:
the image's right is the patient's left.

If you load an image in the neurology convention to MriStudio programs, the
image is inverted. This is, in one sense, a good thing because you never
mixed up right and left.

If you read Analyze format as "Analyze" in programs in MriStudio family, the
programs should automatically flip the Neurology convention to Radiology
convention, but if you read *.img as a raw file, the programs don't know
that it has to convert the formats.

To flip the images or ROI files, you can use the following trick;

> Load the image.
> Save it as "Analyze" format. The *.img saved in this way is
neurology-radiology converted.
> Load the *.img as "RAW" format

Hope this will help.

Susumu

-----Original Message-----
From: mristudio-users-bounces at mristudio.org
[mailto:mristudio-users-bounces at mristudio.org] On Behalf Of Elizabeth Finger
Sent: Tuesday, October 21, 2008 1:22 PM
To: mristudio-users at mristudio.org
Subject: [Mristudio-users] imported ROIs are flipped from front to back of
brain

Hello-

I have created automated ROI's in AFNI, and then used MRIcro to convert them
from the Head/Brik format to an Analyze format (.hdr and .img files).  By
changing the header to match the header file of ROI's created in DTI studio
(e.g. DB Name: ROI; Aux File ROI Save As; Extents: 13694; Gmax 255; Reg 114,
and extension .roihdr) I am able to load the ROIs into ROI editor using the
raw format.  The only problem is that they are flipped in the A-P direction
(e.g. a frontal lobe ROI shows up in the occipital lobe).  The same thing
happens if the ROI's are created in SPM (they can only be loaded into DTI
studio in raw format, and the location of the ROI is flipped from front to
back.  If I load the roi.img file into ROI editor as just a regular image
(not under the ROI tab) it displays the ROI drawing in the correct A-P
orientation.

I have not been able to find a way in any of the programs to flip the ROI
orientation so that it stays aligned with the anatomical and so that it
displays correctly when loaded as an ROI.

Any suggestions would be much appreciated.

Thanks,
Elizabeth Finger

 
----------------------------------------------------------------------------
----
This information is directed in confidence solely to the person named above
and may contain confidential and/or privileged material. This information
may not otherwise be distributed, copied or disclosed. If you have received
this e-mail in error, please notify the sender immediately via a return
e-mail and destroy original message. Thank you for your cooperation.

_______________________________________________
Mristudio-users mailing list
Mristudio-users at mristudio.org
http://lists.mristudio.org/mailman/listinfo/mristudio-users