Abstract #3911

Considerations for Accurate Active Detuning Measurements in Densely Parallel Array Coils

Manisha Shrestha¹, Mirsad Mahmutovic¹, Sam-Luca JD Hansen¹, Jason P Stockmann², and Boris Keil¹

¹Institute of Medical Physics and Radiation Protection, TH Mittelhessen University of Applied Sciences, Giessen, Germany, ²A.A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Harvard Medical School, Boston, MA, United States

Synopsis

Keywords: RF Arrays & Systems, High-Field MRI, detuning

Active detuning of receive array coil during transmit prevents large currents being induced in the coil which could damage sensitive electronic components and create SAR hotspots. The standard method of adjusting active detuning using a double probe shows an offset in the resonant frequency set at bench when tested in the presence of a scanner. Setting a high impedance at the input of loop using S11 measurement exactly at Larmor frequency has proven to be a better method to detune loops actively.

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.