Overview of menu options and shortcuts

Region of interest (ROI) functions

Three different ROI methods are available.

Freehand : draws a freehand trace ROI in active window

The trace is auto-completed (to form a closed shape) upon releasing the mouse button. The final ROI can be Moved (pressing right mouse button with cursor on pink cross).

Polygon (spline) ROI

The polygon ROI is initially displayed as a circle with four ‘anchor’ points that can be moved to change the shape of the ROI. Additional anchor points can be added by <ctrl>+ right button click. The whole ROI can be moved by left-clicking anywhere on the ROI line.

Rectangular ROI:

Displays a rectangle that can be moved by right-clicking anywhere inside the ROI. The size/shape can be changed by clicking any of the four edge circles.

The ROI stats window displays the statistics for the currently selected ROI:

The statistical data can be copied to the clipboard (Copy stats >>) and the ROI source can be switched between the underlay and overlay data (of present).

Display of time-intensity-curve for active ROI: if the data in the current ROI window is dynamic, the time intensity curve (TIC) for the selected ROI will be shown in the ROI Intensity curve under the ‘Dynamic ROI analysis’ tab.

Switching between <trace> and <pan> modes

 <Trace> mode  enabled interactive tracing of current cursor position in all three orthogonal MPR views, and also display of TIC for current cursor position (or multiple voxels around the cursor) in case of dynamic data as specified by the ‘Cursor trace ROI size’ options (below)

Right click in trace mode: change window level/width
Pressing ‘z’ + right click: zoom image

<Pan/zoom mode >  is used to interactively zoom/pan images and disable MPR tracing:
Right-click: Zoom active image
<shift> + left-click: pan active image
Pressing ‘w’ + moving cursor in active window (not pressing button) : changing image window / level

Additional shortcuts and tips

• Toggle overlay on/off (if present) : <ctl + O>  or ‘Hide/show’ overlay button under ‘Overlay’ tab
• Toggle lesion mask on/off (if present): <ctl + M>  or ‘show lesion mask’ check box under ‘Dynamic ROI analysis’ tab and ‘Lesion stats’ tab.
• Toggle volume of interest (VOI) on/off: <ctr + V> or press any of the <set target VOI> buttons

Settings window/level numerically from menu:

Done under <Display options> and set separately for MPR images and functional images. <Reset> button will reset win/level to values at load-time (which are inherited from the settings in nordicICE upon starting the VAI module). Window level/width can also be set using the mouse.

Interpolation: chose between cubic spline and nearest neighbour interpolation for the display.

Defining VOI and tumor mask :

These two menu options should typically be used together: first, define the volume of interest and then segment the tumor by activating the seed growing function .