ISMRM23 - Making It Work: Sequence Tutorials: EPI

ISMRM & ISMRT Annual Meeting & Exhibition • 03-08 June 2023 • Toronto, ON, Canada

Making It Work: Sequence Tutorials: EPI

Sunrise Course

ORGANIZERS: Mark Chiew, Anthony Christodoulou, Brian Hargreaves, Khin Tha

Tuesday, 06 June 2023

718B

07:00 - 08:00

Moderators: Wietske van der Zwaag

Skill Level: Basic to Intermediate

Session Number: S-Tu-06

CME Credit

Session Number: S-Tu-06

Overview
Pulse sequences and imaging techniques often evolve beyond their initial descriptions in the literature, adding refinements over time that are key to practical implementation. Each hour of this sunrise session presents a deep-dive tutorial into a specific technique from start to finish, highlighting the details that make each technique really work in practice.

Target Audience
Physicists, engineers, and clinicians looking to implement their own sequences or gain a more comprehensive understanding of how various MRI acquisitions work under the hood.

Educational Objectives
As a result of attending this course, participants should be able to:
- Identify the key components in a modern EPI acquisition and its corrections;
- Describe the characteristics of an MR fingerprinting acquisition and inference scheme;
- Explain the workings of a TSE/FSE/RARE acquisition and its various refinements; and
- Summarize the methods for ASL acquisitions and associated physiological modelling.

07:00		Echoplanar Imaging: Acquisition View Presentation Video Christopher Nguyen
07:30		Echoplanar Imaging: Corrections View Presentation Video Nadine Graedel Keywords: Image acquisition: Artefacts, Physics & Engineering: Physics, Image acquisition: Fast imaging EPI is well-known for being fast but artifact prone. The most characteristic issue associated with EPI is Nyquist or N/2 ghosting caused by imperfections in the oscillating readout gradients. Due to its long acquisition window and low effective bandwidth in the phase-encoding direction EPI also suffers from image distortion in areas with high magnetic susceptibility differences, signal dropout, chemical shift artifacts and resolution loss. In this session we will learn about the origin of these artifacts and discuss prevention and correction strategies.