Calibrating CT images for density - false results

[w00d]

Hello community,
 
I am new to ImageJ and transformation of my ct images is false: 1026 -->
1052 instead of 1000; 26-->52 instead of 0.
http://oi60.tinypic.com/25ps8w6.jpg
 
How can I correctly calibrate my CT images to reach 1000 and 0?
In the analyze->calibrate menu is [left column:measured value][right
column:corresponding target value]?
 
Kind regards
Marc
 
CT Image: http://goo.gl/zeCkEl (original .IMA)
OR http://www.dicomlibrary.com/?manage=5ec82ccc1f76f1138eeb0a6be1ac94e2



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