> MultiSlice RTP Help files

This section is divided into several sub-sections :-

• Open
• Open a study of 10 images
This will pop-up the file selector box, and give a list of all the study files in the current directory. You may change the directory and use the filter command  to refresh the files.*.study files are simple text files with the names of 10 images (preferably with full paths, although the program will load the files from the current directory if no path  is specified).

• Open a single RAW file
This will pop-up the file selector box as before with the ability to load a single RAW image file. This gives the user the ability to load a single 512 x 512, 8-bit image of raw data (no header).

• Save As...

Select a file using the file selector and press Save As... This will popup a small box  giving the
user the ability to save the processed image under a different filename, if required.

• Exit...

This will popup a small dialog box and ask you if you want to exit. Press OK for a normal exit.

• Print f1=>f1.PS

Simply select the file to print using the file selector, then press this button to save the image to disk with a .ps extension in postscript format. From the shell, invoking qpr will print the image to your nearest
convenient laser (In my case it is set to print to a laser hundreds of meters away connected to a serial link followed by several convertors and finally to a Sun workstation, demonstrating the flexibility of the printing script). Ask your system administrator to configure the printing script for your particular use. Note that the image printed will be printed in landscape mode if your printer does not support A3 size sheets. (i.e. it will be turned clockwise by 90 degrees and printed on an A4 laser printer)

• Region Detection
• Region Growing
• Grow Regions in 3D
     Select between one and ten images to apply the 3D growing algorithm from the file selector
               box. Enlarge the first image selected (if not already enlarged) and click the Grow Regions
               button. You will be asked to enter a threshold value between 0 and 255. Type in the value and
               press OK. Then click the left mouse button on the first (enlarged) image and wait for
               the algorithm to run to completion and display the required growth. Since this is in 3D, for n
               files selected, n files will be loaded after the algorithm runs. Note that omission of any steps
               will result in the algorithm not being run.
               Simply redo the steps omitted and try again.
• Grow images in 3D
               Select between one and ten images as before. This time there is no need to select a point as
               the algorithm does not need a point to be selected. Simply enter the threshold value and
               wait for results.

•    Watershed

   Select a single image from the selector. Enter the sigma value after clicking on the menu in the
   dialog box and press OK. This algorithm runs in two parts and may be slow, depending on both
   image and processor speed. It first does a Gaussian-type filter followed by a Watershed
   segmentation.

• Edge Detection
• Erode
• Dilate
   Iterative erode and dilate. As before, select a file and simply enter the number of iterations for each
   (max:500), click OK to allow the algorithms to run.

• Editing Tools

This will product a popup box and allow you to draw various shapes and objects on the screen.
Note that they are drawn with an XOR mask, so any refreshing of the image will remove them automatically.

• Zoom

Allows a zoom on the currently selected image. Enter the value of the zoom, and a correspondingly sized box will appear in the image. Move it to the place you want to zoom and click the left mouse button. This will produce a zoom of the selected area. Zooms are loaded as separate files for manipulation. (You can do a maximum of 50 levels of zooming per image, but the zoomed area can be zoomed so that a maximum of (50)^19 zooms are possible, without deleting any image from the screen.)

• Compare f1+f2=>f3

This performs a selective compare of files 1 and 2. You need to select two files from the file selector and click this option to produce a comparison of the areas common to both.

• Operate on

This will give a listing of all twenty memory spaces for files. Simple click the small button to the side of the file name to select a file. clicking it again will deselect it. Note that it will prevent you selecting a deleted file or an empty file name.

• Cascade

It displays all the windows in a cascaded form. There is no need to use the file selector for this function.
• Tile

It tiles all the windows. Similar to cascade above.
• Deallocate File

Removes the first file selected. If no files are selected it normally will remove the first file loaded. Be aware that this is an extremely processor intensive process. It reloads all the files to ensure that there are no memory leaks. It also maximizes, de-selects and re-orders all the files. If your machine has insufficient RAM this may crash your machine or cause excessive swapping. Be aware that if you need to use this procedure, you should have at least  48 megabytes or RAM on your machine. (Note that, however, most modern Silicon Graphics systems come with at least 128 megabytes.)
• Reduce/Enlarge all files

Reduces any files not enlarged and enlarges any files reduced. A fast way to swap between two sets of images. This is an alternative to using the small green enlarge/reduce button on each image.

• Version

Pops up the version and program information dialog box. If your administrator has set up a web-browser on your machine, A Help menu will appear which will launch your web browser to this page. Ask your system administrator for details.