“Enabling sub-100μm resolution interventional MRI at 7 Tesla”

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Oct. 22, 2013 from 11 a.m. to noon

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Hess Center 1st Floor
TMII Large Conference Room 117
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Speakers
  • Arcan Erturk
RSVP

No

LECTURE

Arcan Erturk

PhD Candidate
Research Assistant - Dept. of Electrical & Computer Engineering

Johns Hopkins University, Division of MR Research 600 N. Wolfe St., Park Bldg #319, Baltimore, MD 21287 Phone 410-340-8446 Email: merturk1@jhu.edu

Enabling sub-100μm resolution interventional MRI at 7 Tesla”

The interventional loopless antenna is a tiny MRI detector that can be fabricated in sub-millimeter dimensions, and is suitable for interventional and intravascular applications. We found that, the signal-to-noise ratio (SNR) of the loopless antenna MR detector improves quadratically with increasing main magnetic field strength. Thus at 7T, SNR is more than 20-fold higher than at 1.5T, enabling MRI at <100μm resolution. The usable field-of-view area is also increased by ~10-fold compared to 3T.

At ultra-high field (B0>3T), excitation of deeply situated tissue using external coils is challenging due to RF penetration and B1 inhomogeneity. Some of these problems can be solved with multi-channel coils and static/dynamic RF shimming methods. However, the location of the internal detector must be tracked and shim settings adjusted during the already complicated environment of an interventional MRI procedure. To circumvent the RF field related problems and added complexity, we deploy the loopless antenna detector in transmit/receive mode without any external coils. Spatially-selective and B1-insensitive composite excitation pulses are utilized to improve the uniformity of the excitation field. By this means, the huge SNR gains of a 7T excite/detect loopless antenna can provide a large field-of-view for both device tracking and target localization inside the body, requiring only a few Watts of RF power.

Tuesday, October 22, 2013

11:00am
Hess Center 1
st Floor
TMII Large Conference Room 117

Hosted By: Bachir Taouli, MD Contact: claudia.donnerhack@mountsinai.org

 

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