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<TITLE>Re: [Mristudio-users] B0 averages</TITLE>
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<FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'>Domenico,<BR>
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You should be able to fully customize your sequence by scanning in free mode, though I think this may require a research agreement.<BR>
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Here are some instructions that may be helpful (you need Advanced User access on your scanner for this):<BR>
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1) <B>Gain Advanced User access:</B> <BR>
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To gain Advanced User access, press the [escape]+[control] keys simultaneously. If Windows Explorer is visible in the menu, then Advanced User is already on. If not, turn on Advanced User mode on by going to: [Programs]--->[Advanced User], then enter the Advanced User password. <BR>
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2) <B>Create DiffusionVectors.txt file:</B> <BR>
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Go to: [Windows Explorer]--->[My Computer]--->[MedSystem C]--->[MedCom]--->[MriCustomer]--->[seq], and create a custom "DiffusionVectors.txt" (correct capitalization is important). <BR>
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3) <B>Verify the sequence parameters and copy sequence to scheduled scans:</B> <BR>
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Go back to exam window and to verify that: <BR>
</SPAN></FONT><UL><LI><FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'> DiffusionMode=Free
</SPAN></FONT><LI><FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'> b=1000, or what you plan to specify for you non b=0 weighed images<BR>
</SPAN></FONT></UL><FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'><BR>
If settings are correct, copy sequence to the list of scheduled scans. Once the scan is completed, rename the "DiffusionVectors.txt" file so other Users do not accidentally run your custom DTI sequence. <BR>
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Your DiffusionVectors.txt file should look something like this:<BR>
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---<BR>
# My custom diffusion vector set<BR>
# 5 b=0 images<BR>
# 4 diffusion weighted images<BR>
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</SPAN></FONT><FONT SIZE="2"><FONT FACE="Courier, Courier New"><SPAN STYLE='font-size:10pt'>[directions=9]<BR>
CoordinateSystem = xyz<BR>
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vector[0] = ( 0.000000, 0.000000, 0.000000)<BR>
vector[1] = ( 0.000000, 0.000000, 0.000000)<BR>
vector[2] = ( 0.000000, 0.000000, 0.000000)<BR>
vector[3] = ( 0.000000, 0.000000, 0.000000)<BR>
vector[4] = ( 0.000000, 0.000000, 0.000000)<BR>
vector[5] = ( -0.525731, -0.850651, 0.000000)<BR>
vector[6] = ( -0.525731, 0.850651, 0.000000)<BR>
vector[7] = ( 0.000000, 0.525731, 0.850651)<BR>
vector[8] = ( 0.000000, -0.525731, 0.850651)<BR>
---<BR>
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Best, Theo<BR>
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On 12/4/09 8:10 AM, "Domenico Zaca" <<a href="domenico.zaca@gmail.com">domenico.zaca@gmail.com</a>> wrote:<BR>
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</SPAN></FONT><BLOCKQUOTE><FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'>Hi,<BR>
<BR>
Does anyone know if there is a way to set up on a 3T Siemens Trio scanner<BR>
a DTI sequence with a number of B0 acquisitions different than the number of acquisitions for each gradient direction (e.g 4 B0 averages and 2 averages for each of the other directions)?<BR>
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Thanks,<BR>
Domenico <BR>
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</SPAN></FONT></FONT></BLOCKQUOTE><FONT SIZE="2"><FONT FACE="Consolas, Courier New, Courier"><SPAN STYLE='font-size:10pt'><BR>
</SPAN></FONT></FONT><FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'>Best, Theo<BR>
<BR>
_____________________________________________________________<BR>
Theo G.M. van Erp, Ph.D.<BR>
<BR>
Assistant Researcher<BR>
Associate Director of the Clinical Neuroscience Lab<BR>
NAPLS MRI Task Force Scientific Project Coordinator<BR>
Clinical Neuroscience Lab<BR>
Department of Psychology <a href="vanerp@psych.ucla.edu">vanerp@psych.ucla.edu</a><BR>
University of California Los Angeles voice (310) 206-4902<BR>
1285 Franz Hall, room 5562 fax (310) 794-9740<BR>
Los Angeles, California, 90095-1563<BR>
<a href="http://www.bol.ucla.edu/~vanerp">http://www.bol.ucla.edu/~vanerp</a><BR>
<a href="http://napls.psych.ucla.edu">http://napls.psych.ucla.edu</a><BR>
_____________________________________________________________<BR>
<BR>
<BR>
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