Abstract:
BACKGROUND AND PURPOSE:The composition of carotid atherosclerosis was visualized by using 3D MRI at high resolution with 200-micrometer (3) voxels. Magnetic resonance signal characteristics were correlated with plaque components, including collagenous cap, necrotic core, and calcification, to define resolution and other requirements for future clinical carotid MRI. METHODS:Twenty-one en bloc carotid endarterectomy specimens were imaged ex vivo by 3D gradient-echo MRI by using a 1.5-T clinical scanner with repetition time, echo time, and flip angle of 40 ms, 18 ms, and 20 degrees, respectively. Plaques were placed in Gd-saline and imaged in a solenoid radiofrequency coil. For quantitative tissue-specific signal analysis, techniques were developed to match tissue sections analyzed by MRI and histology. RESULTS:Three-dimensional imaging resolved complex morphological features not visualized by density- or T(2)-weighted 2D spin-echo imaging. The collagenous cap, necrotic core, and areas of focal calcification showed differing signal characteristics: mean contrast-to-noise ratio for cap versus underlying core was 20. The signal distributions for media and necrotic core overlapped but were resolvable in most specimens. The signal from thrombus was variable. CONCLUSIONS:En bloc specimens provide a useful model for studying plaque MRI. By use of isotropic submillimeter resolution, the collagenous cap and underlying necrotic core typically can be distinguished, and calcification can be identified. Thrombus displays a wide variation in signal intensity. The techniques presented could facilitate future clinicohistological correlation studies for atherosclerotic plaque MRI.
journal_name
Strokejournal_title
Strokeauthors
Coombs BD,Rapp JH,Ursell PC,Reilly LM,Saloner Ddoi
10.1161/hs1101.098663subject
Has Abstractpub_date
2001-11-01 00:00:00pages
2516-21issue
11eissn
0039-2499issn
1524-4628journal_volume
32pub_type
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