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Automated Function Imaging (AFI)
Overview
Automated Function Imaging (AFI) provides a clinical decision support tool for assessing left ventricular function at rest. When left ventricular function can be visualized, yet assessment is questionable, AFI uses computerized quantitative assessment to highlight potential wall motion abnormalities. AFI can also potentially be used to differentiate disease from non-disease segments, and to learn more about the various strain patterns indicative of specific disease types.
The computerized assessment presents the data in four different modes: a parametric image, an anatomical M-Mode, a strain graph and bull's-eye display. The AFI algorithm non-invasively tracks and analyzes peak systolic strain based on 2D strain.
In addition to providing clinical decision support, AFI also decreases LV function assessment variability and streamlines workflow while improving laboratory quality assurance. The clinician selects the views to activate the algorithm, marks aortic valve closure timing critical to accuracy, and then anchors three points inside the myocardial tissue. The algorithm differentiates tissue from blood space to improveaccuracy when defining the region of interest.
The three-click method minimizes variability potentially created in a manual tracing process. Two points placed at the base along the mitral valve annulus, and one at the apex, triggers the automated process. The clinicians can override the processed image results at any time.
AFI is available on VividTM 7 Dimension system and EchoPACTM workstation with Breakthrough 2006. It can process and analyze data acquired on any GE Vivid product that meets the algorithm's minimum requirements.
Authors:
Sue Phillip, RCS
Zvi Friedman, PhD
Elizabeth Harrison, MS, RDCS