27th ISMRM Annual Meeting • 11-16 May 2019 • Montréal, QC, Canada

Weekend Educational Session

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Weekend Course

ORGANIZERS: Cornelia Laule, Alex MacKay

Saturday, 11 May 2019
Room 516C-E  13:30 - 17:00 Moderators:  Cornelia Laule, Alex MacKay

Skill Level: Basic to Intermediate

Session Number: WE-12

The goal of this course is to introduce the field of myelin imaging. The session will begin with an overview of the role of myelin in normal brain function and clinical value of being able to image myelin. Each of the next 7 presentations will cover different approaches to imaging myelin.

Target Audience
Clinicians who would like to be able to monitor myelin in demyelinating diseases and acquired injuries; neuroscientists who are interested in understanding myelin in normal brain function and want to learn what imaging techniques are available to measure myelin; and physicists and engineers who want to learn how to image myelin.

Educational Objectives
As a result of attending this course, participants should be able to:
- List the pros and cons of the available MR techniques for measuring myelin; 
- Describe how inhomogeneity in B0 and B1 influence the different myelin imaging techniques;
- Explain how changes in CNS environment due to non-myelin pathology influence the different myelin imaging techniques; and
- Identify which of the available MR techniques for measuring myelin is most appropriate for each participant's application.



  What Is Myelin & Why Is It Important to Image?
Samuel Ludwin
  Magnetization Transfer Techniques
Guillaume Duhamel
The potential of Magnetization Transfer techniques (MTR, qMT and ihMT) for myelin imaging is presented

  Myelin Water Imaging
Shannon Kolind
Myelin water imaging (MWI) provides quantitative measurements specific to myelin by separating the MRI signal into contributions from the various water pools present within a voxel. In central nervous system tissue these water pools generally correspond to intra- and extra-cellular water, which relaxes slowly, and water trapped between the myelin bilayers, which relaxes quickly. The fraction of water corresponding to the water trapped within the myelin sheath, the myelin water fraction (MWF), provides a quantitative measure related to myelin content. This course will discuss acquisition and analysis techniques as well as common artefacts and pitfalls.

  T1 & T1w/T2w
Christine Tardif
This talk describes two methods used for imaging myelin content in vivo: T1 mapping and T1-weighted/T2-weighted (T1w/T2w) signal ratio imaging. Their advantages and limitations will be discussed in comparison to other techniques presented in the Myelin Imaging session.

  Break & Meet the Teachers
  Ultra Short TE
Mark Does
  Synthetic Myelin Imaging
Marcel Warntjes
Synthetic MR imaging is a method that creates conventional  T1W, T2W and FLAIR images by measuring the T1 and T2 relaxation times. The method can only resolve slow relaxation components, but by using a model for myelin including magnetization exchange, it can infer the presence of myelin. The advantage of the method is the short scan time, where typically full head coverage is obtained in 6 minutes. A new sequence is developed where even a 1 mm isotropic resolution can be obtained in that scan time. An overview is provided of the measurements, modeling and clinical application of myelin detection using synthetic MRI.

Dong-Hyun Kim
Recently, there has been numerous research on myelin water imaging via T2* contrast, e.g. based on multi gradient-echo imaging. In this talk, I will present the methodology of T2* based myelin water imaging. Acquisition and reconstruction methods will be presented. Also, the pros and cons of T2* based myelin water imaging and challenges will be discussed.  

  Positron Emission Tomography
Benedetta Bondini
  Panel Discussion
  Adjournment & Meet the Teachers
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