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<p class=MsoNormal><span style='color:#1F497D'>Would always use the parallel
imaging options for EPI scans especially at 3T. <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>There are numerous articles that
validate these methods as been more preferable. Siemens does also have some
literature that supports this.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>The main issue is the choice of
technique, Siemens does emphasise the GRAPPA techniques as it does have fewer reconstruction
artefacts but mSENSE may potential have a slight SNR advantage. You are using a
SKYRA which is a great scanner it would be more beneficial if you are using the
32 Channel coil but take into account 3t has less SNR deep penetration so if you
increase your parallel imaging factors to much your will strip out a disproportionality
large amounts of SNR centrally as compared to </span><span
style='color:#1F497D'>p</span><em><span style='font-family:"Arial","sans-serif";
color:#1F497D;font-weight:normal'>eripheral</span></em><b><span
style='color:#1F497D'> </span></b><span style='color:#1F497D'>areas.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><span style='color:#1F497D'>Kind Regards<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Jeff McIntosh</span><span
style='color:#A6A6A6'><o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#A6A6A6'>Head of MRI and Research<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:4.0pt;color:#BFBFBF'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><img width=178 height=56
id="Picture_x0020_1" src="cid:image001.jpg@01CC4C59.0656E4A0"
alt="maquire medical imaging signage"><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:4.0pt;color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.5pt;color:#1F497D'>MACQUARIE
MEDICAL IMAGING<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.5pt;color:#AC9336'>Macquarie
University Hospital<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.5pt;color:#AC9336'>Ground Floor, 3
Technology Place<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.5pt;color:#AC9336'>Macquarie
University NSW 2109<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.5pt;color:#1F497D'>P</span><span
style='font-size:10.5pt;color:#AC9336'> 02 9430 1108 </span><span
style='font-size:10.5pt;color:#1F497D'>F</span><span style='font-size:10.5pt;
color:#AC9336'> 02 9430 1199 </span><span style='font-size:
10.5pt;color:#1F497D'>M </span><span style='font-size:10.5pt;
color:#AC9336'>041 477 1016 <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.5pt;color:black'><a
href="http://www.mqmi.com.au">www.mqmi.com.au</a><o:p></o:p></span></p>
</div>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:
"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'> mristudio-users-bounces@mristudio.org
[mailto:mristudio-users-bounces@mristudio.org] <b>On Behalf Of </b>Joanne Lin<br>
<b>Sent:</b> Wednesday, July 27, 2011 12:19 PM<br>
<b>To:</b> mristudio-users@mristudio.org<br>
<b>Subject:</b> [Mristudio-users] DTI acquisition<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span lang=EN-NZ>Hi MriStudio users,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-NZ><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-NZ>Apologies for this question that’s
outside the analysis tools, but I was hoping to draw on your expertise
regarding parallel imaging for DTI.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-NZ><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-NZ>I am starting a new trial and trying to
decide on acquisition parameters. We are using a 3 T Siemens Skyra system
and acquiring EPIs for DTI and task fMRI, along with T1-weighted MPRAGE.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-NZ><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-NZ>For parallel imaging (iPAT), there is the
option to use GRAPPA or mSENESE – default is GRAPPA.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-NZ><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-NZ>I realise that acquisition times of EPIs
are not directly affected by iPAT, however it is meant to improve geometric
distortion around sinuses etc but at a cost – up to 30% signal
loss. I am having trouble deciding whether to leave iPAT off – more
SNR but possibly more distortion, or is the trade-off for less distortion and
less signal worth it?<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-NZ><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-NZ>Any advice would be greatly appreciated.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-NZ><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-NZ><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-NZ>Best regards,<br>
Jo<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-NZ><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-NZ><o:p> </o:p></span></p>
<p class=MsoNormal><b><span lang=EN-US style='font-family:"Georgia","serif"'>Joanne
Lin<o:p></o:p></span></b></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Georgia","serif"'>BPharm
(Hons), RegPharmNZ<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Georgia","serif"'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Georgia","serif"'>Pharmacist/PhD
Candidate<br>
School of Pharmacy<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Georgia","serif"'>Faculty
of Medical & Health Sciences<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Georgia","serif"'>The
University of Auckland<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Georgia","serif"'>Private
Bag 92019<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Georgia","serif"'>Auckland,
New Zealand<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Georgia","serif"'>+64
9 373 7599 Ext 88468</span><span lang=EN-NZ style='font-size:10.0pt'><o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-NZ><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-NZ style='font-size:12.0pt;font-family:"Times New Roman","serif"'><br>
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