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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Thank you both for your advice – it’s been very very helpful!!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Kind regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Joanne<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<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>susumu mori<br>
<b>Sent:</b> Thursday, 28 July 2011 11:58 p.m.<br>
<b>To:</b> DTI Studio, ROI Editor, DiffeoMap Questions/Support<br>
<b>Subject:</b> Re: [Mristudio-users] DTI acquisition<o:p></o:p></span></p>
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<p class="MsoNormal">I'm second to Jeff.<o:p></o:p></p>
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<p class="MsoNormal">You should use iPAT. You can recover SNR loss by scanning longer but it's very difficult to correct image distortion by B0 susceptibility. <o:p></o:p></p>
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<p class="MsoNormal">My experience with Siemens mSENSE has not been very good and I always use GRAPPA.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Susumu<o:p></o:p></p>
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<p class="MsoNormal">On Tue, Jul 26, 2011 at 10:42 PM, Jeff McIntosh <<a href="mailto:jeffm@mqmi.com.au">jeffm@mqmi.com.au</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-AU" style="color:#1F497D">Would always use the parallel imaging options for EPI scans especially at 3T.
</span><span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-AU" style="color:#1F497D"> </span><span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-AU" style="color:#1F497D">There are numerous articles that validate these methods as been more preferable. Siemens does also have some literature that supports this.</span><span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-AU" style="color:#1F497D"> </span><span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-AU" 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 p<em>eripheral</em><b>
</b>areas.</span><span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-AU" style="color:#1F497D"> </span><span lang="EN-AU"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-AU" style="color:#1F497D">Kind Regards</span><span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-AU" style="color:#1F497D"> </span><span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-AU" style="color:#1F497D">Jeff McIntosh</span><span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-AU" style="color:#A6A6A6">Head of MRI and Research</span><span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-AU" style="font-size:4.0pt;color:#BFBFBF"> </span><span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span lang="EN-US" style="color:#1F497D">Error! Filename not specified.</span></b><span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-AU" style="font-size:4.0pt;color:#1F497D"> </span><span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-AU" style="font-size:10.5pt;color:#1F497D">MACQUARIE MEDICAL IMAGING</span><span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-AU" style="font-size:10.5pt;color:#AC9336">Macquarie University Hospital</span><span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-AU" style="font-size:10.5pt;color:#AC9336">Ground Floor, 3 Technology Place</span><span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-AU" style="font-size:10.5pt;color:#AC9336">Macquarie University NSW 2109</span><span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-AU" style="font-size:10.5pt;color:#1F497D">P</span><span lang="EN-AU" style="font-size:10.5pt;color:#AC9336"> 02 9430 1108
</span><span lang="EN-AU" style="font-size:10.5pt;color:#1F497D">F</span><span lang="EN-AU" style="font-size:10.5pt;color:#AC9336"> 02 9430 1199
</span><span lang="EN-AU" style="font-size:10.5pt;color:#1F497D">M </span><span lang="EN-AU" style="font-size:10.5pt;color:#AC9336">041 477 1016
</span><span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-AU" style="font-size:10.5pt;color:black"><a href="http://www.mqmi.com.au" target="_blank">www.mqmi.com.au</a></span><span lang="EN-AU"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-AU" style="color:#1F497D"> </span><span lang="EN-AU"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span lang="EN-US" style="font-size:10.0pt">From:</span></b><span lang="EN-US" style="font-size:10.0pt">
<a href="mailto:mristudio-users-bounces@mristudio.org" target="_blank">mristudio-users-bounces@mristudio.org</a> [mailto:<a href="mailto:mristudio-users-bounces@mristudio.org" target="_blank">mristudio-users-bounces@mristudio.org</a>]
<b>On Behalf Of </b>Joanne Lin<br>
<b>Sent:</b> Wednesday, July 27, 2011 12:19 PM<br>
<b>To:</b> <a href="mailto:mristudio-users@mristudio.org" target="_blank">mristudio-users@mristudio.org</a><br>
<b>Subject:</b> [Mristudio-users] DTI acquisition</span><span lang="EN-AU"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-AU"> <o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Hi MriStudio users,<span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Apologies for this question that’s outside the analysis tools, but I was hoping to draw on your expertise regarding parallel imaging for DTI.<span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">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.<span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">For parallel imaging (iPAT), there is the option to use GRAPPA or mSENESE – default is GRAPPA.<span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">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?<span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Any advice would be greatly appreciated.<span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Best regards,<br>
Jo<span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span lang="EN-US" style="font-family:"Georgia","serif"">Joanne Lin</span></b><span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.0pt;font-family:"Georgia","serif"">BPharm (Hons), RegPharmNZ</span><span lang="EN-AU"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.0pt;font-family:"Georgia","serif"">Pharmacist/PhD Candidate<br>
School of Pharmacy</span><span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.0pt;font-family:"Georgia","serif"">Faculty of Medical & Health Sciences</span><span lang="EN-AU"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.0pt;font-family:"Georgia","serif"">The University of Auckland</span><span lang="EN-AU"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.0pt;font-family:"Georgia","serif"">Auckland, New Zealand</span><span lang="EN-AU"><o:p></o:p></span></p>
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