<html>
<head>
<style>
.hmmessage P
{
margin:0px;
padding:0px
}
body.hmmessage
{
font-size: 10pt;
font-family:Verdana
}
</style>
</head>
<body class='hmmessage'>
Hello Dear DTIstudio users:<BR><BR>I am new to DTIstudio, I was hoping someone could give me some much needed advises for beginners.<BR><BR><BR>I was trying to obtain the FA values for my brain phantom (PHILIP 3T scanner). When I clicked on "DTI mapping", it prompted me to enter the "gradient table", how do I calculate the "gradient table"?<BR><BR>Thanks in advanced<BR><BR>Best regards<BR><BR>Eric<BR><BR><BR><BR><HR id="stopSpelling">Date: Thu, 9 Apr 2009 11:04:09 -0400<BR>From: susumu@mri.jhu.edu<BR>To: mristudio-users@mristudio.org<BR>Subject: Re: [Mristudio-users] MriView3D application close<BR><BR>
<DIV dir="ltr" align="left"><SPAN class="EC_230314414-09042009"><FONT face="Arial" color="#0000ff" size="2">Hi Hugh,</FONT></SPAN></DIV>
<DIV dir="ltr" align="left"> </DIV>
<DIV dir="ltr" align="left"><SPAN class="EC_230314414-09042009"><FONT face="Arial" color="#0000ff" size="2">When you got this error, please suspect one of the
following two reasons;</FONT></SPAN></DIV>
<DIV dir="ltr" align="left"> </DIV>
<DIV dir="ltr" align="left"><SPAN class="EC_230314414-09042009"><FONT face="Arial" color="#0000ff" size="2">1) Memory shortage:</FONT></SPAN></DIV>
<DIV dir="ltr" align="left"> </DIV>
<DIV dir="ltr" align="left"><SPAN class="EC_230314414-09042009"><FONT face="Arial" color="#0000ff" size="2">Even if you have many GB of memories, 32-bit Windows system
can allocate only 1 - 1.5 GB to each program. To check if you have the memory
problem, please restrict the slices to be calculated. In the
initial data parameter window, there is a section called "Slices to be
processed". Here you can specify only a portion of slices to be processed.
Please limit the slices to, for example, 0-9 and see how it goes. If you can
calculate tensors without errors, then you have the memory problem. The solution
is; a) upgrade to the 64-bit system or b) devide the calculation to 2 batches
(e.g. slice 0-29 for the first batch and 30-59 for the second batch), calculate
all maps (e.g. FA), and later combine them.</FONT></SPAN></DIV>
<DIV dir="ltr" align="left"> </DIV>
<DIV dir="ltr" align="left"><SPAN class="EC_230314414-09042009"><FONT face="Arial" color="#0000ff" size="2">2) Mismatch between the gradient table and the number of
images:</FONT></SPAN></DIV>
<DIV dir="ltr" align="left"> </DIV>
<DIV dir="ltr" align="left"><SPAN class="EC_230314414-09042009"><FONT face="Arial" color="#0000ff" size="2">For example, if you specify 12-orientation table and 30
volume images, then you get the error. After loading the data and before you go
to the Dti Map tab, make sure that you have 1 b0 + 64 DWIs in the pull-down menu
in the right column of the Image tab. If you have the correct number of the
images, then you might have an error in your gradient table. Small mistakes such
as missing "," are often difficult to detect. The best way is; a) load the data
using DtiMapping under the "File" button on the top left, b) close the window,
c) open the image paremater window again by clicking "DtiMapping" in the "File"
button again, d) the window still remembers the gradient table you entered last
time. This remembered window tells how DtiStudio interpreted your gradient
table. If there is any syntax errors, you may find them much easier. For
example, if you enter, "4: 1 0.5 0", instead of "4: 1, 0.5, 0", then you would
find, "4: 1, 0, 0".</FONT></SPAN></DIV>
<DIV dir="ltr" align="left"> </DIV>
<DIV dir="ltr" align="left"><SPAN class="EC_230314414-09042009"><FONT face="Arial" color="#0000ff" size="2">If any of these do not solve the issue, please let us
know.</FONT></SPAN></DIV>
<DIV dir="ltr" align="left"> </DIV>
<DIV dir="ltr" align="left"><SPAN class="EC_230314414-09042009"><FONT face="Arial" color="#0000ff" size="2">Susumu</FONT></SPAN></DIV><BR>
<DIV class="EC_OutlookMessageHeader" lang="en-us" dir="ltr" align="left">
<HR>
<FONT face="Tahoma" size="2"><B>From:</B> mristudio-users-bounces@mristudio.org
[mailto:mristudio-users-bounces@mristudio.org] <B>On Behalf Of </B>Hugh
Wang<BR><B>Sent:</B> Wednesday, April 08, 2009 6:30 PM<BR><B>To:</B>
mristudio-users@mristudio.org<BR><B>Subject:</B> [Mristudio-users] MriView3D
application close<BR></FONT><BR></DIV>
Hi, <BR><BR>I was using the dtistudio (ver. 2.4) to look at the
Siemens DICOM diffusion images (1baseline,64 gradients). After successfully
loading the images, I click the "dti map" option at lower right corner. Whatever
calculation I choose, it always gives me an error: <BR><BR>"MriView3D MFC
Application has encountered a problem and needs to close. We are sorry for
the inconvenience."<BR><BR>I tried several PCs, and the problem keeped the same.
I would appreciate that if there's anyone having any idea on how to solve it.
Thanks.<BR><BR clear="all">Best,<BR>Hugh<BR><br /><hr />Find car news, reviews and more <a href='http://a.ninemsn.com.au/b.aspx?URL=http%3A%2F%2Fsecure%2Dau%2Eimrworldwide%2Ecom%2Fcgi%2Dbin%2Fa%2Fci%5F450304%2Fet%5F2%2Fcg%5F801459%2Fpi%5F1004813%2Fai%5F859641&_t=762955845&_r=tig_OCT07&_m=EXT' target='_new'>Looking to change your car this year?</a></body>
</html>