[Mristudio-users] DTI acquisition

[Joanne Lin]

Thank you both for your advice - it's been very very helpful!!





Kind regards,

Joanne



From: mristudio-users-bounces at mristudio.org [mailto:mristudio-users-bounces at mristudio.org] On Behalf Of susumu mori
Sent: Thursday, 28 July 2011 11:58 p.m.
To: DTI Studio, ROI Editor, DiffeoMap Questions/Support
Subject: Re: [Mristudio-users] DTI acquisition



I'm second to Jeff.



You should use iPAT. You can recover SNR loss by scanning longer but it's very difficult to correct image distortion by B0 susceptibility.



My experience with Siemens mSENSE has not been very good and I always use GRAPPA.



Susumu

On Tue, Jul 26, 2011 at 10:42 PM, Jeff McIntosh <jeffm at mqmi.com.au<mailto:jeffm at mqmi.com.au>> wrote:

Would always use the parallel imaging options for EPI scans especially at 3T.



There are numerous articles that validate these methods as been more preferable. Siemens does also have some literature that supports this.



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 peripheral areas.



Kind Regards



Jeff McIntosh

Head of MRI and Research



Error! Filename not specified.



MACQUARIE MEDICAL IMAGING

Macquarie University Hospital

Ground Floor, 3 Technology Place

Macquarie University NSW 2109

P  02 9430 1108   F  02 9430 1199   M   041 477 1016

www.mqmi.com.au<http://www.mqmi.com.au>



From: mristudio-users-bounces at mristudio.org<mailto:mristudio-users-bounces at mristudio.org> [mailto:mristudio-users-bounces at mristudio.org<mailto:mristudio-users-bounces at mristudio.org>] On Behalf Of Joanne Lin
Sent: Wednesday, July 27, 2011 12:19 PM
To: mristudio-users at mristudio.org<mailto:mristudio-users at mristudio.org>
Subject: [Mristudio-users] DTI acquisition



Hi MriStudio users,



Apologies for this question that's outside the analysis tools, but I was hoping to draw on your expertise regarding parallel imaging for DTI.



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.



For parallel imaging (iPAT), there is the option to use GRAPPA or mSENESE - default is GRAPPA.



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?



Any advice would be greatly appreciated.





Best regards,
Jo





Joanne Lin

BPharm (Hons), RegPharmNZ



Pharmacist/PhD Candidate
School of Pharmacy

Faculty of Medical & Health Sciences

The University of Auckland

Private Bag 92019

Auckland, New Zealand

+64 9 373 7599 Ext 88468





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