Surprising Aspects of MRI Physics: What Would MacGyver Do To Detect Motion & Frequency Shifts?
Sunrise Course
ORGANIZERS: Brian Hargreaves, Shaoying Huang, Rita Schmidt, Rolf Schulte, Ramesh Venkatesan, Andrew Webb
Monday, 06 May 2024
Summit 2
07:00 -
08:00
Moderators: Barbara Dymerska & Brian Rutt
Skill Level: Intermediate to Advanced
Session Number: S-M-02
CME Credit
Session Number: S-M-02
Overview
In this sunrise session, we want to get a glimpse of some of the surprising and unexpected aspects of MR physics, to motivate thinking out of the box – for example, how one can look in the MRI room, pick up an existing tool and use it for an unconventional purpose; or how we can get an image without having gradients; or even how we can use Eddy currents and Lorenz force for our advantage. Finally, we will deepen our understanding of sequences in our daily use and bring up some of the special aspects of steady state and spin echo acquisitions.
Target Audience
Scientists and engineers.
Educational Objectives
As a result of attending this course, participants should be able to:
- Explain MR physics;
- Describe how to use RF coils as respiratory and motion sensor and use coils sensitivities for B0 mapping;
- Identify how to get an image without gradients;
- Identify what contrast one can get using Eddy currents and Lorentz force for imaging;
- Describe how one can use a feature of a steady state acquisition that usually results in an artifact to a sensitive approach for fMRI contrast; and
- Examine special cases of spin echo acquisition.
| 07:00 |  | RF Coils as Respiratory & Motion Sensor: Pilot Tone Peter Speier Keywords: Image acquisition: Motion correction, Physics & Engineering: Hardware, Cross-organ: Development This presentation introduces Pilot Tone as a versatile method to gather physiologic information in parallel with and without disturbing MR imaging. A small signal generator generates a weak continuous magnetic signal near Larmor frequency. This Pilot Tone is modulated by physiologic motion and is acquired with the standard MR receive system in parallel to the spin signal. The presentation will describe how to get started and then focus on the physics of the signal formation and the current state of retrospective and prospective applications for cardiac, body and head imaging as described in the literature. |
| 07:30 | | Mapping B0 Fluctuations from Inconsistencies in the Coils Sensitivities Klaas Pruessmann |