Difference between revisions of "Visualizing Images: Displaying images using the triplanar view"
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Revision as of 17:53, 13 February 2012
Contents
Displaying images using the triplanar view
Displaying image datasets in triplanar view
The image window for the triplanar view includes a File menu, an Options menu, a toolbar, and three views of the dataset. The bottom right corner of the window displays the currently selected coordinate. Two guidelines (cross hairs) also intersect at the selected point. Additionally, the axis appears in the upper left corner in each view of the dataset.
You can use icons and buttons on the toolbar to change the magnification level, draw a point or line, apply paint, and apply a new intensity values to selected voxels in the image.
Designating new center points for image datasets
File
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Close frame-Closes this window.
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Options
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Show Axes-Displays the XY (top left), ZY (top right), and ZX (bottom left) axes on the images.
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Show Cross Hairs-Displays cross-hair lines on the images. When you move these lines on one image, it also moves to the corresponding points on the other two images. Notice that the Absolute and Position values at the bottom right of the screen also change when you move the cross hairs.
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Show Talairach Grid-Displays a Talairach (stereo tactic) grid on the images.
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Show Talairach Position-Lists the Talairach position.
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Link to Another TriImage-Links this image to another image in triplanar view.
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Aligns two images.
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Magnifies the image. It might be necessary to manually resize the window and use scroll bars to view all of the image.
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Minifies the image (reduces the magnification level).
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Displays image at the original magnification level.
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Reassigns a new center to the dataset. The location that you select appears in the center of the image window.
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Allows you to apply a transformation matrix to an image dataset.
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Applies the rotations and translations made to the image.
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Draws a point on an image.
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Assigns the subsequently drawn contour to a new group. If this icon is not selected, all subsequent contours are assigned to the existing group.
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Deletes a single contour or a group of contours. Caution: When you select this icon, the contour is not copied to the clipboard. It is permanently deleted.
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Indicates the volume that should be cropped.
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Crops the specified volume.
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Selects paint brush tool. You can use the paint brush to fill specific voxels with color.
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Changes the default intensity to the one sampled by the eyedropper. Click this icon, then move the pointer to the image. The sampled intensity becomes the default intensity.
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Applies the paint grow segmentation method. This method uses voxel aggregation to group voxels into larger regions. The effect is much like a fill operation; when you click a voxel, this algorithm is used to determine whether adjacent voxels should be filled with the default color or intensity.
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Deletes painted sections of the image. To delete, click the icon and move the pointer on painted areas of the image.
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Deletes all paint from the image.
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Used with the paint brush and erase icons. Click this icon to indicate the size of the eraser or the paint brush tip. Click this icon to paint or erase one voxel each time the mouse button is clicked.
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Used with the paint brush and erase icons. Click this icon to indicate the size of the eraser or the paint brush tip. Click this icon to paint or erase 16 voxels (4 x 4 square) each time the mouse button is clicked.
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Used with the paint brush and erase icons. Click this icon to indicate the size of the eraser or the paint brush tip. Click this icon to paint or erase 100 voxels (10 x 10 square) each time the mouse button is clicked.
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Indicates the intensity value.
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Changes the color of the paint used. This icon is often used in conjunction with the Paint Brush and Paint Grow icons. Click this icon and select the desired color from the window that appears.
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Indicates the opacity level of the paint. When this icon is clicked, a window appears that allows you to indicate the opacity of the paint: 0 is transparent, 1 is opaque. By default the paint is translucent (0.3), which allows you to see the original image under the paint.
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Permanently applies intensity level to the image.
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Interpolation
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Determines the intensity of the additional voxels using one of the three following methods: Bilinear-Weighs the average of the four nearest voxels (to the newly interpolated voxel). The interpolated voxel is assigned the resulting intensity. Bspline 3rd order-Weighs the average of the 27 nearest voxels (to the newly interpolated voxel). Bspline 4th order-Weighs the average of the 64 nearest voxels (to the newly interpolated voxel).
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Aligning image datasets
The following instructions explain how to use the alignment tool:
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Creating, modifying, and deleting point VOIs
Cropping images
Changing the intensity
Visualizing Images: Displaying images using the triplanar-dual view