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CT Density Measurements for Characterization of Adrenal Tumors Ex Vivo: Variability Among Three CT Scanners

Alfred Stadler1, Wolfgang Schima1, Gerhard Prager2, Peter Homolka3, Gertraud Heinz1, Sanjay Saini4, Edith Eisenhuber1 and Bruno Niederle2

1 Department of Radiology, University of Vienna, Waehringer Guertel 18-20, Vienna A-1090, Austria.
2 Department of Surgery, University of Vienna, Vienna, Austria.
3 Department of Biomedical Engineering and Physics, University of Vienna, Vienna, Austria.
4 Department of Radiology, Massachusetts General Hospital and Harvard Medical School, 32 Fruit St., Boston, MA 02114.



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  		Fig. 1. —Axial CT scan with 5-mm slices shows density measurement of tumor specimen mounted on plate having attenuation equivalent to that of water in phantom. Arrow indicates oval region-of-interest measurement of tumor. Hypodense tissue (arrowhead) is retroperitoneal fat adjacent to tumor after en bloc resection.

 


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  		Fig. 2. —Graph shows CT attenuation values converge at higher kilovoltage values. Thus, attenuation difference between adenomas and nonadenomas decreases with increasing kilovoltage. • = Somatom Plus 4 scanner (Siemens, Erlangen, Germany), {blacktriangledown} = Somatom VolumeZoom scanner (Siemens), {circ} = Tomoscan AV scanner (Philips, Best, The Netherlands).

 

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