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Arteriosclerosis, Thrombosis, and Vascular Biology | 1997

Intravascular Magnetic Resonance Imaging of Aortic Atherosclerotic Plaque Composition

Luis C. L. Correia; Ergin Atalar; Mark D. Kelemen; Ogan Ocali; Grover M. Hutchins; Jerome L. Fleg; Gary Gerstenblith; Elias A. Zerhouni; Joao A.C. Lima

Magnetic resonance imaging (MRI) may be an excellent tool to define atherosclerotic plaque composition, but surface MRI (SMRI) suffers from a low signal-to-noise ratio and low resolution of arterial images. Intravascular MRI (IVMRI) represents a potential solution for acquiring high-quality in vivo images of atherosclerotic plaques. Isolated segments of 11 thoracic human aortas obtained at autopsy were imaged by IVMRI using an intravascular receiver catheter coil designed and built at our institution. Images obtained by IVMRI were compared with corresponding images obtained by SMRI and with histopathological aortic cross sections. The intensity of intimal thickness and plaque components was graded by IVMRI and histopathology using a score of 1 for mild, 2 for moderate, and 3 for severe intensity. IVMRI had an agreement of 75% with histopathology in fibrous cap grading (37.5% expected, kappa = 0.60, P < 0.001) and of 74% in necrotic core grading (39% expected, kappa = 0.57, P < 0.001). Intraplaque calcification was correctly graded by IVMRI in six of the eight plaques in which histopathology recognized calcium. The analysis of intimal thickness showed 80% agreement between IVMRI and histopathology (52% expected, kappa = 0.59, P < 0.001). IVMRI image features were similar to those of SMRI. In addition, IVMRI accurately determined atherosclerotic plaque size in comparison with histopathology and SMRI (slope = 1.25 cm2, r = 0.99, P < 0.001 for luminal area by IVMRI vs histopathology; slope = 0.97 cm2, r = 0.996, P < 0.001 for luminal area by IVMRI vs SMRI). IVMRI has the potential to provide important prognostic information in patients with atherosclerosis because of its ability to accurately assess both plaque composition and size.


Magnetic Resonance in Medicine | 1997

Intravascular magnetic resonance imaging using a loopless catheter antenna

Ogan Ocali; Ergin Atalar


Magnetic Resonance in Medicine | 1996

High resolution intravascular MRI and MRS by using a catheter receiver coil

Ergin Atalar; Paul A. Bottomley; Ogan Ocali; Luis C. L. Correia; Mark D. Kelemen; Joao A.C. Lima; Elias A. Zerhouni


Archive | 1996

Method of magnetic resonance imaging and spectroscopic analysis and associated apparatus employing a loopless antenna

Ogan Ocali; Ergin Atalar


Archive | 2002

Biopsy and sampling needle antennas for magnetic resonance imaging-guided biopsies

Ananda Kumar; Ergin Atalar; Ogan Ocali


Magnetic Resonance in Medicine | 1998

Ultimate intrinsic signal-to-noise ratio in MRI

Ogan Ocali; Ergin Atalar


Archive | 1997

Method of magnetic resonance analysis employing cylindrical coordinates and an associated apparatus

Ergin Atalar; Ogan Ocali


Archive | 1999

Enhanced safety coaxial cables

Ergin Atalar; Ogan Ocali


Magnetic Resonance in Medicine | 1998

Catheter-tracking FOV MR fluoroscopy

Ergin Atalar; Dara L. Kraitchman; Bliss G. Carkhuff; Jeffery C. Lesho; Ogan Ocali; Meiyappan Solaiyappan; Michael A. Guttman; Harry K. Charles


Archive | 1997

Method of magnetic resonance imaging and spectroscopic analysis and associated apparatus

Ogan Ocali; Ergin Atalar

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Joao A.C. Lima

Johns Hopkins University

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Elias A. Zerhouni

Johns Hopkins University School of Medicine

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Ananda Kumar

Johns Hopkins University

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