Meeting Banner
Abstract #2012

Magnetization Transfer Knee Imaging at 0.05 Tesla with Extremely Low SAR

Shi Su1,2, Ye Ding1,2, Vick Lau1,2, Jiahao Hu1,2, Junhao Zhang1,2, Xuehong Lin1,2, Liubin Wu1,2, Alex T. L. Leong1,2, Yujiao Zhao1,2, and Ed X. Wu1,2
1Laboratory of Biomedical Imaging and Signal Processing, The University of Hong Kong, Hong Kong SAR, China, 2Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong SAR, China

Synopsis

Keywords: Magnetization Transfer, Magnetization transfer, Ultra-low-field; Cartilage.

Motivation: The intrinsic low specific absorption rate (SAR) at ultra-low-field (ULF) enables the application of versatile RF pulses for magnetization transfer (MT) knee imaging.

Goal(s): To explore MT knee imaging for articular cartilage evaluation at 0.05 Tesla.

Approach: GRE sequences, without and with sinc-modulated RF pulse train (SPT) modules as MT preparation, were utilized for knee imaging.

Results: Articular cartilage exhibits strong MT effects, with MT ratios exceeding 30% for different subjects. Both inter-examination test and multiple subject results demonstrate the robustness of ULF MT knee imaging. Moreover, the MT preparation SAR is estimated to be extremely low as 3.1mW/kg.

Impact: MT knee imaging is demonstrated at 0.05 Tesla for the first time. Strong MT effects have been observed in articular cartilage with an extremely low SAR of 3.1mW/kg, rendering the potential of ULF MT knee imaging for articular cartilage evaluation.

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