The toolbar has three sections: on the left are controls for playing through the image data, in the centre are controls for determining the action of the mouse in each of the image windows, and on the right are tools for controlling what gets displayed in the various windows.
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The two left-pointing arrows are used to rewind data to the start of the buffer, i.e. the first recorded frame. The button is greyed out if there is no data in the recording buffer. It thus provides a convenient indication of whether or not any data is loaded. |
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The right-pointing arrow is used to play through image data. When activated, the data will normally be displayed at the speed it was originally acquired. However, every frame in the data will be displayed - so if the computer is not able to update or display every frame in time, the playback will be slower. |
The next set of icons determine what the mouse will do in each of the image windows.
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In the 3D window, the rotate icon can be used to move the viewpoint: the left and middle mouse button rotate the viewpoint about different axes. In the review window, the left button allows setting of the window centre and width for displaying 16-bit image data. This button also allows rotation of the reslice in the reslice window. In all windows, the right mouse button pans the viewpoint by using the scrollbars, if the view has been sufficiently zoomed to make the scrollbars visible. Note that the cursor keys can also be used in most windows to move or rotate the images. |
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The selection icon can be used like the draw tool, with the drawn region allowing masking of recorded data, i.e. setting of where there is valid data in the image. |
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This icon can be used to place landmarks in the image window, 3D window or any of the reslice windows. If a landmark is placed on a 3D data set, it is fixed in 3D space after creation and can be used to measure distances and geometry. If a landmark is placed on a 2D data set, it can be used to place comments on the images. See the landmarks task page for further information. It is also used to place points when segmenting an object using a shape model. Selecting this or the measure tool will also draw scale bars on all 2D image windows, so long as they have not been disabled with key presses. |
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The draw icon can be used to outline objects in the image window and also curves on surfaces in the 3D window: see the drawing and landmarks task pages for more information. |
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If the draw icon is clicked again after it has already been selected, it toggles between just editing the current contour (as shown) or the normal mode where it can edit anything: see the drawing task page for more information. |
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The measure icon can be used to measure lengths in any of Stradview's image display canvases. Just click on two points in the same canvas: the distance between them will be displayed in the status bar at the bottom of Stradview's main frame. Correct x and y scale parameters are required for the distance to be valid. Clicking with this icon on a surface in the 3D window will show (in the status bar) which triangle and vertex indices have been clicked on, and the depth below the click point. Holding down the shift key while clicking enables selection of hidden surfaces behind the front surface. The measure icon is also used to define lines when measuring cortical properties from data. |
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The erase icon is used to delete nodes on segmentation contours or curves defined on surfaces and either select or delete complete surfaces or contours or sets of contours. See the drawing task page for more information. It can also be used to delete landmarks. |
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If the erase icon is clicked again after it has already been selected, it toggles between just erasing the current contour (as shown) or the normal mode where it can erase anything: see the drawing task page for more information. |
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The two magnifying glass icons work together to determine the way the scale (zoom) is controlled in the image window. If you select the plain magnifying glass, then clicking and dragging in each window will zoom that window by the amount you dragged the mouse. Clicking and releasing without dragging will automatically re-size the image to fit the window. The mouse scroll-wheel (or a two-finger pinch) can also zoom the windows. In the 3D window, holding down the shift key during zoom will change the perspective of the 3D view, and the control key will move the camera closer to the data instead of chaning the scale of the camera. |
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The second magnifying glass with a lock in front of it modifies the behaviour of the other zoom tool. If this is not selected, then zooming is independent in each data window, and when the windows are re-sized, the data will automatically be zoomed-to-fit in each window. This is the default behaviour. If zoom-lock is selected, then after the next time you change the zoom in any window, all the windows will display data at the same magnification. Furthermore, with zoom-lock selected, the data is not automatically zoomed-to-fit if the windows are resized. |
The final four icons control what is displayed in the various windows. There are also some key presses which affect the display.
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Flips the image vertically in the top left display window: useful if scanning from below the target. |
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Determines whether to display frame outlines in the 3D window, and also frame intersections in the other visualisation windows. When pressed, the current frame outline is displayed in the 3D window, as well as the intersections. |
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If this icon is pressed again, it shows a stack of sheets, signifying that all frame outlines will be displayed in the 3D window. |
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Toggles display of centres-of-gravity and names for surfaces in the 3D, reslice and ortho windows. It also toggles display of the patient orientation, if the data is of an appropriate DICOM format, the zoomed region, when not using the scrollbars, and the scale bars, when making measurements. This is the same as pressing the space bar or G key. |
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This icon shows whether landmarks or curves are currently displayed in any of the windows. It also determines if scale bars are shown in the 2D image windows. It is automatically pressed and released depending on what task or tool is selected. |
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However, if it is pressed manually, a 'lock' symbol appears, and landmarks and curves will then be displayed in all windows irrespective of the current task or tool. Clicking again ('lock' symbol with the tool not pressed) will never display these items. A third click returns the display to automatic, as above. |
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This icon shows whether contours or objects are currently displayed in any of the windows. It is automatically pressed and released depending on what task or tool is selected. |
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However, if it is pressed manually, a 'lock' symbol appears, and contours and objects will then be displayed in all windows irrespective of the current task or tool. Clicking again ('lock' symbol with the tool not pressed) will never display these items. A third click returns the display to automatic, as above. |