ISMRM23 - Non-Standard MR Contrast Mechanisms: From Properties to Function II: Electromagnetic Properties

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

Non-Standard MR Contrast Mechanisms: From Properties to Function II: Electromagnetic Properties

Sunrise Course

ORGANIZERS: Karin Shmueli, Cristian Tejos, Richard Thompson, Alex Tze Lun Leong

Tuesday, 06 June 2023

714A/B

07:00 - 08:00

Moderators: Sina Straub

Skill Level: Basic to Intermediate

Session Number: S-Tu-07

CME Credit

Session Number: S-Tu-07

Overview
This course with cover the theoretical foundations and applications of imaging modalities that make use of non-standard contrast mechanisms, such as elastography (MRE), magnetic susceptibility (QSM and SWI), electric conductivity (MR EPT), functional susceptibility changes (fQSM), and ultrashort TE (UTE) and zero TE (ZTE) sequences.

Target Audience
This course is designed for scientists and clinicians who are interested in understanding, developing, or applying imaging techniques that make use of non-standard contrast mechanisms, such as elastography (MRE), magnetic susceptibility (QSM), and electric conductivity (MR EPT). The course is also focused on those interested in functional imaging based on changes in susceptibility (fQSM) or those wishing to use ultrashort TE (UTE) and zero TE (ZTE) sequences to scan challenging structures due to their rapid spin-spin relaxation.

Educational Objectives
As a result of attending this course, participants should be able to:
- Explain the acquisition and processing methods for different MRI approaches with non-traditional contrast mechanisms;
- Discuss the pros and cons of each method; and
- Identify different areas of applications for each method.

07:00		Electromagnetic Properties: Susceptibility: QSM vs. SWI Pros & Cons View Presentation Video Xu Li Keywords: Contrast mechanisms: Electromagnetic tissue properties, Contrast mechanisms: Susceptibility Tissue magnetic susceptibility is an important source of imaging contrast used in susceptibility-weighted imaging (SWI) and quantitative susceptibility mapping (QSM). In this presentation, I will explain and compare the basic technical aspects of SWI and QSM. While SWI focuses on enhancing contrast related to tissue magnetic susceptibility, QSM aims at quantifying the magnetic susceptibility distribution. QSM overcomes blooming artifacts in SWI and improves differentiation between paramagnetic and diamagnetic materials, such as iron and myelin. However, QSM requires a more complicated reconstruction pipeline.
07:30		Electromagnetic Properties: Conductivity - EPT Overview View Presentation Video Stefano Mandija Keywords: Contrast mechanisms: Electromagnetic tissue properties Tissue electrical conductivity represents an emerging quantitative MRI contrast. While tissue conductivity is frequency dependent, this talk will mostly focus on high frequency tissue conductivity (hundred(s) MHz). In particular, we will see how to measure and reconstruct high frequency tissue conductivity from MRI data. We will also review its applications in MRI diagnostic and therapy, with particular attention to cancer. We will then look at current and future activities devoted to the standardization of conductivity imaging and its reconstruction processes. Finally, we will conclude with a short overview of tools and data available to everyone.