Meeting Banner
Abstract #1327

Feasibility Study of Subject-Specific Brain SAR Maps Retrieved from MRI Data

Jessica A. Martinez1,2, Umberto Zanovello3, Alessandro Arduino3, Houchun Harry Hu4, Kevin Moulin5, Stephen E. Ogier1, Oriano Bottauscio3, Luca Zilberti3, and Kathryn E. Keenan1
1Physical Measurement Laboratory, National Institute of Standards and Technology (NIST), Boulder, CO, United States, 2Department of Physics, University of Colorado Boulder, Boulder, CO, United States, 3Istituto Nazionale di Ricerca (INRIM), Torino, Italy, 4Department of Radiology, Section of Radiological Science, University of Colorado, Denver, Anschutz Medical Campus, Aurora, CO, United States, 5Cardiology, Boston Children's Hospital, Boston, MA, United States

Synopsis

Keywords: Safety, Electromagnetic Tissue Properties, SAR, Safety, EPT

Motivation: SAR monitoring and assessment rely on simulations, which are impractical for real-time clinical use due to high computational demands.

Goal(s): To validate a method for obtaining subject-specific SAR maps from standard MRI sequences.

Approach: SAR maps were generated from the complex B1+ field derived from B1 magnitude (XFL) and phase of a bSSFP sequence. Tissue conductivity was estimated using a phase-based Helmholtz electrical properties tomography (EPT) approach, and the electric field was calculated with Ampère’s law.

Results: SAR maps that align with simulation results were produced in 12 minutes, an advancement toward real-time SAR measurement (r=0.52).

Impact: A method for image-based patient-specific SAR mapping retrieved from acquired MRI data in the brain is demonstrated. The resulting maps aligned with electromagnetic simulation-based SAR maps, representing a step toward practical SAR monitoring during clinical examinations.

How to access this content:

For one year after publication, abstracts and videos are only open to registrants of this annual meeting. Registrants should use their existing login information. Non-registrant access can be purchased via the ISMRM E-Library.

After one year, current ISMRM & ISMRT members get free access to both the abstracts and videos. Non-members and non-registrants must purchase access via the ISMRM E-Library.

After two years, the meeting proceedings (abstracts) are opened to the public and require no login information. Videos remain behind password for access by members, registrants and E-Library customers.

Click here for more information on becoming a member.

Keywords