ISMRM23 - Motion Correction Devices from Head to Toe

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

Motion Correction Devices from Head to Toe

Weekday Course

ORGANIZERS: Najat Salameh, Ruud van Heeswijk

Monday, 05 June 2023

718A

13:45 - 15:45

Moderators: Camila Munoz & Oliver Speck

Skill Level: Basic to Advanced

Session Number: M-04

CME Credit

Session Number: M-04

Overview
This course will treat all devices that are used for motion correction (MoCo) of MR images. MoCo of a given region of the body (head, heart, abdomen) is often discussed in isolation, but there are many developments and applications that may be of use to many of these regions. The goal of this session is therefore to showcase the various devices (cameras, ECG, belts, ultrasound, etc.) that are used in MRI throughout the body and to encourage cross-pollination.

Target Audience
All physicists, clinicians, technologists, and engineers who are interested in motion correction and would like to learn how MoCo is performed outside their personal domain.

Educational Objectives
As a result of attending this course, participants should be able to:
- Describe multiple devices that can correct, compensate, or characterize bulk motion during MRI;
- Describe multiple devices that can correct, compensate, or characterize cyclic motion during MRI; and
- Compare MRI MoCo devices and techniques that are used for various regions of the body.

13:45		Head Motion Correction Devices View Presentation Video Tess Wallace Keywords: Image acquisition: Motion correction This talk will provide an overview of sensors used for monitoring head motion in MRI. We will discuss how sensor information may be used to adapt the acquisition and/or reconstruction to improve image quality, as well as sensor requirements to accurately compensate for motion. Here, we classify external sensors into three broad categories – optical, electromagnetic, and mechanical, and discuss the principles by which each sensor measures motion. Finally, we will discuss the advantages and challenges of integrating external sensors with the MRI acquisition and future directions, including sensor fusion and the role of AI in improving sensor-based motion compensation.
14:15		Cardiovascular Motion Correction Devices View Presentation Video Hajime Sakuma Keywords: Cardiovascular: Cardiac The heart exhibits complex motion due to cardiac contraction and respiration. ECG and diaphragm navigators have been commonly used for the past two decades. However, these classic techniques have limitations such as distortion of ECG due to magnetohydrodynamic effects. Self-gating directly extracts physiological motion from the image data, allowing 5D imaging of coronary arteries without ECG. Pilot tone utilizes a small antenna to transmit a continuous RF and MR receiver coils to capture modulated RF signal by cardiac and respiratory motion. External devices such as Doppler ultrasound, acoustic sensors and photoplethysmography have also emerged as methods alternatives to ECG gating.
14:45		Motion Correction Devices for Abdominal Imaging View Presentation Video Bruno Quesson Keywords: Image acquisition: Motion correction, Body: Liver, Contrast mechanisms: Thermometry this presentation wil cover several technologies for measuring and compensating motion in abdominal imaging.
15:15		A Hands-On Introduction to Motion Correction with Pilot Tone View Presentation Video Peter Speier Keywords: Image acquisition: Motion correction, Body: Respiratory, Physics & Engineering: Hardware Pilot Tone has emerged recently as a versatile motion correction method with minimum hardware requirements. The presentation gives a hands-on introduction to implementing Pilot Tone to any MR scanner that allows access to the raw MR data. It starts with a basic setup, discusses the frequency selection, PT signal detection and extraction of physiologic information. Then it describes how to take two common hurdles for general use: Eddy current effects and RF artefacts. Finally, the benefits of local PT generation will be described together with a few examples.