Summation Shadow Effect


Summation Shadow results when parts of a patient or an object in different planes are superimposed, lays (one organ or stucture) over another. The result is a summation image representing the degree of X-Ray absorption by all the superimposed objects. Radiolucent summation shadows are formed in the 'Swiss cheese ' effect. Radiopaque summation shadows are involved in the 'bunch of grapes' effect.



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