CT for Myocardial Characterization of Cardiomyopathy. Byoung Wook Choi, Yonsei University Severance Hospital, Seoul, Korea
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1 CT for Myocardial Characterization of Cardiomyopathy Byoung Wook Choi, Yonsei University Severance Hospital, Seoul, Korea
2 Cardiomyopathy Elliott P et al. Eur Heart J 2008;29: The European Society of Cardiology All rights reserved. For Permissions, please journals.permissions@oxfordjournals.org
3 Etiology, treatment, prognosis, & imaging Etiology Unknown Genetic & Familial Secondary Treatment Supportive care Transplantation Prognosis Progressive heart failure Sudden cardiac death Imaging role: Structural and functional characterization Identifying etiology which is treatable or controllable. Predicting prognosis Imaging modality Echocardiography MRI CT
4 Imaging methods & protocol Structural change Dilatation of ventricle Hypertrophy of myocardium Regional abnormality Enlargement of atria or pulmonary veins Functional change Systolic dysfunction Diastolic dysfunction Tissue characterization Enhancement Perfusion T1/T2/T2* value ECV Calcification MRI Morphology and function Perfusion Late gadolinium enhancement T1 mapping & ECV fraction Coronary angiography (optional) CT Coronary angiography Delayed enhancement CT & MRI
5 Delayed enhancement Kim RJ Cardiovascular MRI and MRA Necrosis Infiltration Fibrosis
6 Etiology by enhancement pattern Mesocardial HCMP DCMP Pulmonary hypertension Patchy Sarcoid Amyloid Myocarditis Subendoardial Infarction Amyloid Hypereosinophilic syndrome Histiocytoid cardiomyopathy Cardiac transplant Subepicardial Myocarditis (most common) sarcoid Transmural Infarction (most common) Myocarditis, severe Sarcoid, chronic Areas of abnormal contrast enhancement can also be used as guide for endomyocardial biopsy to increase diagnostic yield RadioGraphics 2009;29:89-103
7 Prognostic implication of LGE A certain amount of irreversible myocardial damage may cause adverse ventricular remodeling. à ventricular dilatation and dysfunction Myocardial areas affected by irreversible damage will not respond to heart failure drug therapy Irreversible myocardial damage may trigger arrhythmic events causing sudden cardiac death. The extent of total scar (cutoff >5% LV mass) might be the most important parameter in patients with ICM and NICM The number of separate scarred areas independent predictor of outcomes with hazard ratio of 1.7
8 JAMA. 2013;309(9): doi: /jama Date of download: 6/9/2013 Copyright 2012 American Medical Association. All rights reserved.
9 Diffuse fibrosis? TI 280ms TI 280ms TI 220ms
10 T1mapping & ECV Absolute value (time) Quantification of tissue value T1 mapping pre-contrast enhancement (native) post-contrast enhancement Extracellular volume fraction (ECV) R1 myo =1/T1 myo post -1/T1 myo pre R1 blood =1/T1 blood post 1/T1 blood pre ECV= R1 myo / R1 blood (100 HCT)
11 Standardization and consideration of protocol Native T1 mapping Heart rate 1.5T vs. 3.0T 3.0T: T ± 39 ms T1 value: 1.5T < 3T Post-contrast T1 mapping Contrast agent, dose Infusion vs. bolus: similar Waiting time: min Cardiac phase: systolic < diastolic JCMR 2012;14:17 Region: nonseptal septum JCMR 2011;13:75
12 ECV predicts outcome Circulation 2012
13 ECV in myocardium without LGE Eur Heart J 2012;33:1268
14 Why not CT? Circulation 1979;60:284 Circulation 2006;113:
15 Advantage of CT delayed enhancement Delayed imaging in conjunction with coronary artery angiography Isotropic 3D volume data No need an adjustment like TI in MRI
16 Application to cardiomyopathy Myocarditis HCMP J Am Coll Cardiol 2012;60 Eur Radiol 2013;23: (ASCI squre)
17 AMYLOIDOSIS SARCOIDOSIS HYPERTROPHIC Yonsei University: Unpublished data
18 Yonsei University: Unpublished data
19 Clinical application of delayed CT Myocardial Nonischemic infarction cardiomyopathy Emergency Differentiation room from ischemic cardiomyopathy Coronary angiography + myocardial Pattern infarction diagnosis (culprit for artery) specific etiology Chronic Volume fraction myocardial of hyper-enhanced infarction myocardium Infarct sizing for risk stratification Transmural extent
20 Dual-energy delayed CT for quantifying DIFFUSE fibrosis Rabbit model with myocardial fibrosis induced by Doxorubicin Doxorubicin induced cardiomyopathy (1.0mg/kg twice a week for 6 weeks) Imaging Dual-energy CT (2 nd generation dual-source) MRI T1-mapping MRI (MOLLI, 3T-unit) LGE MRI Baseline EF= 53.5% 16 weeks EF= 36.7% JACC CVI: in revision
21 Extracellular volume fraction vs. Collagen volume fraction JACC CVI: in revision
22 ECV measurement with dual energy CT: Advantages Might be more accurate - measurement error Pre-contrast CT is not required. No misregistration between two sets of images (pre- & post- in MRI) Isotropic whole heart volume data
23 Measurement F/75 HCMP, Apical LV MR ECV (Hct 33.8) Septal 33.8% Inferior: 42.6% CT ECV (Hct 32.5) Septal: 31.5% Inferior: 42.8% Radiology: in revision
24 Per-patient analysis PER-SEGMENT ANALYSIS 23 patients with cardiomyopathy MRI ECV= ± 8.61% CT ECV = ± 8.30% P = ICC = MRI ECV= ± 10.50% CT ECV = ± 10.62% P = ICC = 0.940
25 ECV measurement with dual energy CT: Clinical application In addition to differential diagnosis of ischemic and nonischemic cardiomyopathies in combination with CTA and CT MDE Detecting diffuse fibrosis Quantifying diffuse fibrosis
26 summary Assessment of myocardial delayed enhancement is feasible and diagnostic with dual-energy cardiac CT in CMP and shows a good correlation with MRI in volume measurement. Myocardial ECV with dual-energy cardiac CT in cardiomyopathy is feasible to detect and quantify diffuse myocardial fibrosis. ECV calculated with dual-energy cardiac CT showed excellent agreement with that with cardiac MRI, suggesting the potential of myocardial tissue characterization with cardiac CT.
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