Myocardial Fiber Mapping of Rat Hearts Using Apparent Backscatter, with Histological Validation
| Autor: | Thamer Alkhazal, Brianna M. Schick, Michelle L. Milne, Charles S. Chung |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
business.product_category
Materials science Acoustics and Ultrasonics Backscatter Ultrasound tissue characterization Biophysics 030204 cardiovascular system & hematology Article 030218 nuclear medicine & medical imaging Rats Sprague-Dawley 03 medical and health sciences 0302 clinical medicine Image Processing Computer-Assisted Myocardial Animals Scattering Radiation Radiology Nuclear Medicine and imaging Fiber Anisotropy Radiological and Ultrasound Technology Orientation (computer vision) business.industry Apparent Backscatter Ultrasound Reproducibility of Results Heart Wedge (mechanical device) Rats Core (optical fiber) Echocardiography Models Animal Ultrasonic sensor Female business Biomedical engineering |
| Zdroj: | Ultrasound in medicine & biology |
| ISSN: | 1879-291X 0301-5629 |
| Popis: | Myocardial fiber architecture is a physiologically important regulator of ejection fraction, strain and pressure development. Apparent ultrasonic backscatter has been shown to be a useful method for recreating the myocardial fiber architecture in human-sized sheep hearts because of the dependence of its amplitude on the relative orientation of a myofiber to the angle of ultrasonic insonification. Thus, the anisotropy of the backscatter signal is linked to and provides information about the fiber orientation. In this study, we sought to determine whether apparent backscatter could be used to measure myofiber orientation in rodent hearts. Fixed adult-rat hearts were imaged intact, and both a transmural cylindrical core and transmural wedge of the left ventricular free wall were imaged. Cylindrical core samples confirmed that backscatter anisotropy could be measured in rat hearts. Ultrasound and histologic analysis of transmural myocardial wedge samples confirmed that the apparent backscatter could be reproducibly mapped to fiber orientation (angle of the fiber relative to the direction of insonification). These data provided a quantitative relationship between the apparent backscatter and fiber angle that was applied to whole-heart images. Myocardial fiber architecture was successfully measured in rat hearts. Quantifying myocardial fiber architecture, using apparent backscatter, provides a number of advantages, including its scalable use from rodents to man, its rapid low-cost acquisition and minimal contraindications. The method outlined in this study provides a method for investigators to begin detailed assessments of how the myocardial fiber architecture changes in preclinical disease models, which can be immediately translated into the clinic. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|