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Drawing Custom Shutters

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In addition to supporting display of DICOM overlays and shutters from the image headers, the Vetstation also allows you to draw custom shutters on an image.  This is particularly useful when no shutters are provided in the image headers, but the image is leaking a lot of extraneous light, which affects your ability to see subtle contrast.  There are 3 shapes available: circle, rectangle and polygon.

To draw a circular shutter:

1.Select Draw Shutter (Circle) from the Draw Shutter drop-down on the toolbar.
2.Click in the image where you want the centre of the shutter to be.
3.Drag the mouse to expand the circle about the centre point; there is no need to hold the mouse button down while dragging.
4.Click to complete the shutter.

 

To draw a rectangular shutter:

1.Select Draw Shutter (Rectangle) from the Draw Shutter drop-down on the toolbar.
2.Just like drawing a rectangular ROI, two clicks define the corners of the shutter; there is no need to hold the mouse button down while dragging.

 

To draw a polygonal shutter:

1.Select Draw Shutter (Polygon) from the Draw Shutter drop-down on the toolbar.
2.Just like drawing a polygonal ROI, each click defines a vertex for the polygonal shutter and either a double-click, or a click on the first point deposited, completes the shutter.

 

Below is a screenshot showing the result of drawing each type of shutter separately on the same image.  Shutters of different shapes can be combined together on the same image.

 

ClearCanvas Vetstation - User's Guide
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