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Probability in Radiology¹

¹ From the DATA Group, Department of Radiology, Massachusetts General Hospital, Zero Emerson Pl, Suite 2H, Boston, MA 02114. Received October 19, 2001; revision requested December 26; revision received March 27, 2002; accepted April 9. Address correspondence to E.F.H. (e-mail: elk@the-data-group.org).

View larger version (55K): [in a new window]   Figure 1. Venn diagram represents the probability of either of two events based on the probabilities of each and of both. The area of the shape made by combining A and B is the total of the areas of A and B less the area where they overlap.

View larger version (16K): [in a new window]   Figure 2. Binomial distribution, B(i|n,p), for the number of cancers detected out of a total of eight, if the sensitivity of the detector is P = .70.

View larger version (10K): [in a new window]   Figure 3. The normal, or Gaussian, distribution.