Toolbar

The toolbar has three sections: on the left are controls for recording and displaying live 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.

Recording controls

The monitor on the left of the toolbar is used to toggle the display of live images from the image source. This will be greyed out if there is no image source available. Toggling this icon will display images in both the image window and the 3D window, provided position information is available.
The red circle next to the display icon is used to start and stop recording of data. In live mode, or when recording, the text to the right of this group of icons shows the rate at which frames are being grabbed, and the number of frames which have already been recorded. When pre-recorded data is loaded into Stradwin, this text shows how many frames were recorded.

There are a number of recording rates described on the recording task page. One particular rate, labelled 'Gated', also controls the time when the recording actually starts and stops. In this mode, recording does not start immediately the record button is pressed. See the recording task page for further details.

The two left-pointing arrows are used to clear the recording buffer while in record mode. It is particularly useful when performing 'Gated' recordings, as described on the recording task page. This button is also used for rewinding recorded 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 recording has actually taken place.
The right-pointing arrow is used to play through recorded data. When activated, the recorded 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. This can happen if RF data was recorded with no display, or a B-scan display, and is played back with a more advanced display, for instance a strain image.

Drawing and zooming controls

The next set of icons determine what the mouse will do in each of the image windows.

The rotate icon can be used to move the viewpoint in the 3D window. The left mouse button drags the group of frames round. The middle mouse button rotates the image about an axis coming out of the screen. In the review window, this tool allows setting of the window centre and width for displaying DICOM data. This tool also allows rotation of slab renderings in any of the reslice windows.
The selection icon can be used to drag out a region in the image window for setting the video cropping when recording live data. When displaying recorded data, the tool is used like the draw tool, and the drawn region can be used to allow masking of recorded data, i.e. setting of where there is valid data in the recorded image. It can also be used for restricting the processing area when displaying ultrasound strain images from RF data. In this case, clicking with no drag will revert to no selection region. See the 2D and 3D strain imaging for more information.
This icon can be used to place landmarks in the image 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 a proximal femur using the femoral model.
The draw icon can be used to outline objects in the image window: see the drawing task page for more information.
The measure icon can be used to measure lengths in any of Stradwin'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 Stradwin's main frame. Correct x and y scale parameters are required for the distance to be valid. These can be calculated either by 3D calibration or from RF acquisition. The measure icon is also used to define lines when measuring bone cortical thickness from CT data.
The erase icon is used to delete nodes on segmentation contours and either select or delete complete contours or sets of contours. See the drawing task page for more information. It can also be used to delete landmarks.
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 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.

Display controls

The final five icons control what is displayed in the various windows.

Flips the image vertically in the top left display window: useful if scanning from below the target.
The icon of a single sheet clears the frames such that only the current frame is displayed in the 3D window.
The icon of a stack of sheets causes all frames to be displayed in the 3D window.
This icon shows whether landmarks are currently displayed in any of the windows. It is automatically pressed and released depending on what task or tool is selected.
However, if it is pressed manually, a 'lock' symbol appears, and landmarks will then be displayed in all windows irrespective of the current task or tool.
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.
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.