Orthogonal Views

When a 3-dimensional image is loaded into Jim or JMovie, you can display 2 views orthogonal to the regular imaging plane. For example, if you load a scan that shows axial sections, you can also show a coronal and a sagittal section through the data-set. As you click on the image, the location of these orthogonal views changes to follow the location of the mouse click.

Display orthogonal view from the View menu of Jim or JMovie: .

This brings up the Orthogonal Views dialog:

If you do not see any orthogonal views in the dialog, then double click on the main displayed image to select a slice.

When you have a slice selected, you will see the yellow cross-hairs on the main image, and on the orthogonal views. These yellow lines show the location of the slices shown in each of the orthogonal views. Click anywhere on the displayed sections to move the location of the orthogonal views. If you click on the images in the Orthogonal Views Dialog, the selected slice will change as the slice position changes in response to your mouse clicks.

You can change the type of cursor between:

• None - no cursor is shown, but the location of the ortho views follows the mouse as normal.
• Full - full-width yellow cursors are shown.
• Cross-hair - a small cross-hair cursor is shown.

The orthogonal views are displayed in accordance with standard radiological convention; however, in order to do this, Jim needs to know the orientation of the image in the main display. If Jim is not able to determine this automatically, you may set the correct orientation by clicking on the correct button in the Orthogonal Views Dialog:

If the slice ordering does not follow the standard radiological convention (slice number increasing from inferior to superior, from right to left, and from anterior to posterior), then click the check-box to tell Jim that the slice ordering is non-standard.

You can display the orthogonal sections with bi-linear interpolation by clicking the check-box; this is particularly useful when the resolution in the slice direction is lower than the in-plane resolution.

If is selected, then as you zoom and scroll the image in the main display, the orthononal views will display the same zoomed-in area of image.

Note: for this to work, the slices must be zoom-linked in the main display.

The location of the orthogonal sections is shown in the readout at the bottom of the Orthogonal Views Dialog, either in pixels or mm, depending on the setting of the units button.

Orthogonal Views of Movies

If your image is a multi-slice movie, you can display orthogonal views through the multi-slice dataset such that as you play the movie, the orthogonal view will also be shown as a movie. Ensure that the movie has been set up correctly: the number of slices, and whether the slices or time points are contiguous in the images must be set correctly.

Displaying Regions of Interest on Orthogonal Views

When the ROI Toolkit is active, you can visualise the regions you have drawn on the orthogonal views. To make ROIs visible on the orthogonal sections, select the check-box in the Orthogonal Views dialog. By default, only the outline of the ROIs will be shown in the orthogonal views, where they ROI outlines intersect the orthogonal sections, as shown below for a set of ROIs that outline the ventricles.

You can change their appearance by selecting:

• - the ROIs will be shown "filled in" with a solid colour as shown below.

• the ROIs will be shown with a transparent fill as shown below.

When you have finished with the orthogonal views, click on the button.