Tutorial 1: How to import data into 3dviewnix

The simplest way to import data into 3dviewnix is by using the EasyHeader module. This can be accessed via PORT-DATA->In->EasyHeader. EasyHeader would allow you to generate a 3dviewnix gray data file interactively. EasyHeader assumes that your data is of the following form:
  1. Data is in a rectangular array.
  2. You know the file this is stored in and you know the byte offset to the beginning of the data segment. (length of the header)
  3. Data is 8 or 16 bits. (If it is 16 bits that it has the same
  4. Inter slice spacing is the same through the data set.
  5. Your data is 3 or 4 dimensional. byte ordering as the machine you are running on.)
  6. That you know the :


You will see the following fields that you have to set in the image window. (To fill in a field press the left button on the field and then type in what you want).
Of these DATA, TIME, STUDY and SERIES are optional. DIMENSION has to be 3 or 4. # BITS/PIXEL should be 8 or 16.
If you know the minimum and the maximum intensity value specify that for MIN DENSITY, MAX DENSITY. If you don't know specify 0 for MIN DENSITY and a good upper limit (255 for 8 bit and 4095 for 16 bit normally works fine for medical data) . If your upper limit is much bigger than the actual values in the image when you display the slices in any module it will appear very dark, but you can change the gray map to make the image appear lighter.
The PIXEL SIZE and SLICE SPACING should be set correctly. The 3d visualization would appear incorrect if you do not set these values correctly. (If you don't know these values, you need to at least know a correct ratio between them).
Number of SLICES should be filled in correctly. 1st SLICE LOC as described in (6). will have to be filled as needed. If you don't need this use 0.0 for this.


Now you are ready to save the 3dviewnix header. You should see the following fields in the dialog window.
Give a suitable file name for the 3dviewnix file you are creating. This file should have the .IM0 extension at the end of the file name. (it is a zero and not a 'O' at the end of .IM0)
In the dialog window you will see a button called SAVE NEWHDR. Press this to write out the header. You will see an error message when you do this. You can ignore this message if it an error 106 or error 107.


Now you are ready to append the actual data to the end of the 3DVIEWNIX header. Now you should know the name of the file containing the data and how big the header in that file is (how many bytes to skip to locate the start of the data segment).
First fill out the field INPUTFILE with the name of the file. Next fill in the Hdr Length with the size of the input file header (if it is raw data this is zero).
Now change the field SLICES in the dialog window to the same value that is given in # SLICES in the image window.
Now press SAVEDATA. This should write out the data segment to the end of the 3dviewnix file.

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