Cardiac Mechanics Main Panel

To call up this module:

• Press the right-mouse key down on the Analysis button on the VIDA main panel
• Drag the cursor down to the Cardiac Mechanics menu item
• Drag the cursor to the right to the Contour Based Cardiac Mechanics menu item
• Release the right-mouse key to select the Contour Based Cardiac Mechanics menu item

This module imports epicardial and endocardial borders defined in the Region of Interest module and computes regional ejection fractions, regional wall thickness, percent wall thickening, etc. There are a number of user selectable parameters, such as fixed or floating centroids, algorithm for calculation of wall thickness, algorithm for identification of centroid, myocardial mass, number and location of wedges to be used for regional analysis, number of samples to be taken within a wedge and so forth. A graphing package within this module can display any of the computed parameters. If you double click on a point within a graph, the module will identify and highlight the image location corresponding to the selected data point.

Contour-Based Cardiac Mechanics is primarily designed to assess the mechanical functioning of the heart by computing wall muscle thickness, regional and global ejection fractions of a chamber, etc. The regional ejection fraction plots of this module, however, could also be used in a study of upper airway dynamics by measuring which portion of the airway wall contributes the most to airway collapse or expansion.

File Menu Button

Short Axis Demo Cardiac Data Set

View Menu Button

Scaling Menu Item
The Scaling menu item under the View menu button on the Cardiac Mechanics (CM) main window calls up the CM: Scaling panel which allows you to magnify the image up to 500%. To magnify the image press the right mouse key on the box on the bar and drag the box to the right. More information.

Properties Menu Button

Constants Menu Item
The Constants menu item under the Properties menu button on the Cardiac Mechanics (CM) main window calls up the CM: Physical Constants panel which requires you to specify scanner information about the distance between slices and patient information such as heart rate, height, and weight. More information.

Results Menu Button

Graph vs. Phase Menu Item
The Graphs vs. phase menu item under the Results menu button on the Cardiac Mechanics (CM) main window calls up the CM: 2-D Graphs vs. phase panel which graphs results -- wall thickness, wall thickness change (%), regional ejection fraction, epicardium and endocardium wall position, epicardium and endocardium wall curvature, and chamber area -- versus each phase of the cardiac cycle. More information.

Global Graphs Menu Item
The Global Graphs menu item under the Results menu button on the Cardiac Mechanics (CM) main window calls up the CM: Global Graphs panel which graphs global measurements -- wall thickness, wall thickness change (%), ejection fraction, and chamber volume -- versus phase. More information.

Global Results Menu Item
The Global Results menu item under the Results menu button on the Cardiac Mechanics (CM) main window calls up the CM: Global Stats panel which quickly calculates and displays global statistics including myocardial mass, chamber volume, total volume, stroke volume, cardiac output, cardiac index, myocardium index, stroke index, global ejection fraction (G.E.F.), end-systolic and end-diastolic phases, and the body surface area (B.S.A.). More information.

Numeric Save/Print Menu Item
The Numeric Save/Print menu item under the Results menu button on the Cardiac Mechanics (CM) main window calls up the CM: Numeric Save/Print panel which allows you to save or print the global results, general information, and per slice or per region information. More information.

Measure Button

Up-Down Scrollbar Drag Area

To move the image downward:

Press the left mouse key on the box between the two arrows

Drag the box downward continuing to hold down the left mouse key

Right-Left Scrollbar Drag Area

To move the image to the right:

Press the left mouse key on the box between the two arrows

Drag the box to the right continuing to hold down the left mouse key