2D Editing

This mode is used for segmenting the data set into a number of components which can then be moved independently within the view control menu to allow surgical simulation. This slice editing mode complements the 3D editing mode and is appropriate for fine detail adjustments of a previously set up 3D edit state.It displays a 2D edit control window and selects a brush for painting on the image. The currently selected slice of the currently selected object is displayed. The colouration indicates its current state of editing (the colours are shown in the 2D edit window). Press the right mouse button in the main window and drag to paint a region of the image in the aux colour (this colour can be modified in the colour selection menu). Click and drag with the left mouse button to unpaint a region. Regions marked in the aux colour are EXCLUDED from the current object when a different slice or a different interaction mode is selected.

The slice number edit box displays, and allows selection of, the active slice. Slice 0 is at the top of the data set. Changing the active slice causes the state of the old slice to be updated in the 3D database before the new slice is displayed. The slices can be stepped up and down singly with the scrollbar arrows or a new slice number can be typed in the edit window (it is necessary to press the enter key after typing in the number). If the cursor is over the main 2D edit window, the up and down arrow keys may also be used to change slice.

The current slice of the current object can, at any time, be emptied or restored to the full data set by clicking on the Clear slice or Restore Slice buttons.

The Flip marks button swaps the marked and unmarked regions.

The Undo Changes button restores the edit state of the slice to the state it was in when it was most recently selected. Changes to slices are fixed when a new slice is selected..

The Copy last slice marks button copies the edit state from the previously displayed slice, allowing a particular pattern of slice edit to be propagated across a number of slices.

The button Current obj. displays a list of objects to allow reselection. The highlighted image indicates the existing state of the system. Clicking on any image exits the list, selecting the chosen object.

Having edited a data set, the "save edit" option in the file menu allows the information to be saved to a disc file for later retrieval.

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