In radiological technology, the positional ray absorption by the object is evidenced by the action of the residual energy on the films. This results in superimposed image elements which do not allow small absorption differences to be apprehended. The advent of new positive or negative contrast media increased the discrimination possibilities, although it did not allow quantitative assessment.
KeywordsAttenuation Coefficient Magnetic Tape Computerize Tomography Diagnosis Density Unevenness Computerize Tomography Unit
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