One of the first quantitative techniques attempted for assessment of mammographic density was planimetry [6,18]. An observer simply outlined regions on the mammogram that were considered to represent dense tissue, and their area was calculated. This method allowed prediction of relative risk factors on the order of 4, associated with density. It does, however, rely on a skilled interpreter who must make qualitative judgements in segmenting dense from nondense regions. Generally, because the process is labor intensive, only a rather coarse outline of the areas of density is performed.

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