[Mristudio-users] DTI acquisition

[Jeff McIntosh]

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

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MACQUARIE MEDICAL IMAGING
Macquarie University Hospital
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Macquarie University NSW 2109
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From: 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
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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