Imaging Diagnosis with Computed Tomography

  • Yuji Itai


The image obtained by X-ray computed tomography (CT) is a computer-assisted reconstruction of averaged X-ray attenuation in the individual pixel of the matrix. Therefore, CT reflects essentially the same information as the conventional X-ray photograph. The advantage and characteristics of CT are seen in better contrast resolution in a true tomogram. With the conventional film-screen system, a normal organ and its neoplasm show a similar X-ray attenu-ation and cannot be distinguished without the aid of contrast material. CT is capable of distin-guishing a 0.5% difference in contrast expressed in Hounsfield units or numbers (which are set at 0 for water and —1000 for air), whereas the conventional film-screen system can barely distinguish ascites from the liver (about 6% contrast).


Fatty Infiltration Focal Nodular Hyperplasia Cavernous Hemangioma Hypodense Area Arterioportal Shunt 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer Japan 1987

Authors and Affiliations

  • Yuji Itai
    • 1
  1. 1.Department of RadiologyUniversity of Tokyo HospitalHongo, Bunkyo-bu, Tokyo, 113Japan

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