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Multi-Planar Reconstruction (MPR) is an alternate view layout whose purpose is to dynamically reformat a tomographic image stack from its original plane of acquisition into other planes. For this to be effective, the original stack should consist of relatively thin slices. In other word, if (x,y) describes a point in the plane of acquisition, then it should have a relatively high sampling frequency in the “z” dimension (ideally isotropic; i.e. same distance in z as in x and y). Also, the inter-slice distance should be constant, or nearly so, without large gaps between any of the slices. When these conditions are met, it's possible to achieve a high quality interpolated stack in any plane in real time.

Enabling MPR

This Note that this feature is not officially approved for patient care in all Regions, so it 's may not be enabled by default. If you wish to turn it on, select Tools–>Options from the menu bar. Then select the MPR options and click on the Enable MPR checkbox.

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Also, notice that in this dialog, you can change the Slice Spacing Tolerance. This setting controls how much variability in the thickness between slices will be deemed acceptable. If the distance between any two slices varies by more than this amount, then MPR will not be allowed for that image stack.

Once MPR has been enabled, you can show the series that's in the currently selected image box in MPR view by clicking the MPR icon in the toolbar: , by selecting Tools–>MPR–>Open Selection with MPR, or by selecting Open with MPR… from the right-click context menu.

Initializing the volume for reformatting can take a lot of system resources, so if the original series is large (like > 500 CT slices), then it could take some time to load the MPR view.

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