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Transesophageal Magnetic Resonance Imaging Kendrick A. Shunk,1 Joao A.C. Lima,1 Alan W. Heldman,1 and Ergin Atalar2*
 

Summary: Transesophageal Magnetic Resonance Imaging
Kendrick A. Shunk,1 Joao A.C. Lima,1 Alan W. Heldman,1 and Ergin Atalar2*
The purpose of this study was to develop a non-invasive method
of imaging the thoracic aorta that would provide both morpho-
logical detail within the aortic wall and information about
regional aortic wall motion. An esophageal probe is described
that allows transesophageal MR imaging (TEMRI) of the thoracic
aorta and has several potential advantages over the competing
non-vasculoinvasive techniques of transesophageal echocardi-
ography (TEE) or standard MRI. The probe consists of a loop-
less antenna housed inside a modified Levin gastric tube, with
external matching and tuning circuitry. Using this probe, the
thoracic aorta has been imaged in longitudinal and cross-
sectional views. Details of the aortic wall were readily seen.
Tissue tagging for measurement of focal stress/strain relation-
ships was demonstrated to be feasible. TEMRI avoids the risks
inherent in intravascular MRI yet provides comparable image qual-
ity. Potential applications of the device are discussed. Magn
Reson Med 41:722726, 1999. 1999 Wiley-Liss, Inc.
Key words: atherosclerosis, aorta, tagging, TEE

  

Source: Atalar, Ergin - Department of Electrical and Electronics Engineering, Bilkent University

 

Collections: Engineering; Biology and Medicine