On-Line Myocardial Tissue Characterization with a New Commercially Produced Software

Area of Science:

• Cardiovascular Ultrasound
• Myocardial Tissue Characterization
• Diagnostic Imaging

Background:

• Cyclic variation of integrated backscatter (CVIB) analyzes myocardial acoustic properties using backscattered radiofrequency signals.
• Previous studies with prototype equipment showed reduced CVIB in pathological states.
• Commercially available software now allows for online CVIB analysis.

Purpose of the Study:

• To evaluate the performance of a new commercially produced software for online analysis of CVIB.
• To compare CVIB results in control, cardiomyopathy, and heart transplant patient groups.
• To assess the reproducibility and variability of the commercial CVIB software.

Main Methods:

• Myocardial integrated backscatter was measured using a Hewlett-Packard Sonos 1500 system.
• Measurements were taken in the septum and posterior walls across multiple regions.
• Three patient groups were studied: control, end-stage cardiomyopathy, and heart transplant recipients.

Main Results:

• The mean CVIB in the control group's septum was 5.04 +/- 1.60 dB.
• Reduced CVIB was observed in all studied regions for both cardiomyopathy and heart transplant groups.
• Intraobserver variability was 6.5%, interobserver variability was 5.7%, and reproducibility was 7.5% over 3 months.

Conclusions:

• Online CVIB analysis is feasible with commercially produced software.
• The software provides reproducible results with low variability.
• CVIB may detect cardiac structural changes, even without functional alterations, as seen in transplant patients.