Non-contrast estimation of diffuse myocardial fibrosis with dual energy CT: A phantom study.
J Cardiovasc Comput Tomogr
; 12(1): 74-80, 2018.
Article
in En
| MEDLINE
| ID: mdl-29242134
ABSTRACT
BACKGROUND:
Estimation of diffuse myocardial fibrosis, substrate for adverse events such as heart failure and arrhythmias in patients with various cardiac disorders, is presently done by histopathology or cardiac magnetic resonance. We sought to develop a non-contrast method to estimate the amount of diffuse myocardial fibrosis leveraging dual energy computed tomography (DECT) in phantoms and a suitable small animal model. METHODS ANDRESULTS:
Phantoms consisted of homogenized bovine myocardium with varying amounts of Type 1 collagen. Fifteen mice underwent sham surgery, no procedure, or transverse aortic constriction (TAC) for 5 or 8 weeks to produce moderate or severe fibrosis, respectively. Phantoms and ex vivo mouse hearts were imaged on a single source, DECT scanner equipped with kVp switching. Monochromatic images were reconstructed at 40-140 keV. Linear discriminant analysis (LDA) was performed on mean myocardial CT numbers derived from single energy (70 keV) images as well as images reconstructed across multiple energies. Classification of myocardial fibrosis severity as low, moderate or severe was more often correct using the multi-energy CT/LDA approach vs. single energy CT/LDA in both phantoms (80.0% vs. 70.0%) and mice (93.3% vs. 33.3%).CONCLUSIONS:
DECT myocardial imaging with multi-energy analysis better classifies myocardial fibrosis severity compared to a single energy-based approach. Non-contrast DECT can accurately and non-invasively estimate the extent of diffuse myocardial fibrosis in phantom and animal models. These data support further evaluation of this approach for in vivo myocardial fibrosis estimation.Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Phantoms, Imaging
/
Multidetector Computed Tomography
/
Cardiomyopathies
/
Myocardium
Type of study:
Prognostic_studies
Limits:
Animals
Language:
En
Journal:
J Cardiovasc Comput Tomogr
Journal subject:
ANGIOLOGIA
/
CARDIOLOGIA
/
RADIOLOGIA
Year:
2018
Document type:
Article
Affiliation country:
United States
Publication country:
EEUU
/
ESTADOS UNIDOS
/
ESTADOS UNIDOS DA AMERICA
/
EUA
/
UNITED STATES
/
UNITED STATES OF AMERICA
/
US
/
USA