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Radiology. 2012 Sep;264(3):876-83. doi: 10.1148/radiol.12112458. Epub 2012 Jul 6.

Interstitial myocardial fibrosis assessed as extracellular volume fraction with low-radiation-dose cardiac CT.

Author information

1
Department of Radiology and Imaging Sciences, National Institutes of Health Clinical Center, 10 Center Dr, Bldg 10, Room 1C355, Bethesda, MD 20892-1182, USA.

Abstract

PURPOSE:

To develop a cardiac computed tomographic (CT) method with which to determine extracellular volume (ECV) fraction, with cardiac magnetic resonance (MR) imaging as the reference standard.

MATERIALS AND METHODS:

Study participants provided written informed consent to participate in this institutional review board-approved study. ECV was measured in healthy subjects and patients with heart failure by using cardiac CT and cardiac MR imaging. Paired Student t test, linear regression analysis, and Pearson correlation analysis were used to determine the relationship between cardiac CT and MR imaging ECV values and clinical parameters.

RESULTS:

Twenty-four subjects were studied. There was good correlation between myocardial ECV measured at cardiac MR imaging and that measured at cardiac CT (r = 0.82, P < .001). As expected, ECV was higher in patients with heart failure than in healthy control subjects for both cardiac CT and cardiac MR imaging (P = .03, respectively). For both cardiac MR imaging and cardiac CT, ECV was positively associated with end diastolic and end systolic volume and inversely related to ejection fraction (P < .05 for all). Mean radiation dose was 1.98 mSv ± 0.16 (standard deviation) for each cardiac CT acquisition.

CONCLUSION:

ECV at cardiac CT and that at cardiac MR imaging showed good correlation, suggesting the potential for myocardial tissue characterization with cardiac CT.

PMID:
22771879
PMCID:
PMC3426854
DOI:
10.1148/radiol.12112458
[Indexed for MEDLINE]
Free PMC Article

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