DDSM: Digital Database for Screening
Mammography
The Digital Database for Screening Mammography (DDSM) is
a resource for use by the mammographic image analysis
research community.
(Available at:
http://marathon.csee.usf.edu/ Mammography/Database.html)
The database contains approximately 2,500 studies, each
one includes two images of each breast, along with some
associated patient information (age at time of study,
ACR breast density rating, subtlety rating for
abnormalities, and ACR keyword description of
abnormalities) and image information (scanner, spatial
resolution, etc.). Images containing suspicious areas
have associated pixel-level "ground truth" information
about the locations and types of suspicious regions.
The
Digital Database for Screening Mammography is organized
into "cases" and "volumes." A "case" is a collection of
images and information corresponding to one mammography
exam of one patient. A "volume" is simply a collection
of cases collected together for purposes of ease of
distribution. All volumes are available on 8mm tape.
Each case in this volume of cancer cases has at least
one path-proven cancer. Some cases contain more than one
cancer in one breast, a cancer in each breast, or a
cancer along with other abnormal/suspicious regions. The
outlines of all regions have been transcribed from
markings made by an experienced mammographer. A case
consists of between 6 and 10 files, classified as four
categories:
-
"ics" file: contains some information about the
images, such as the age of the patient, the size of
the mammograms, whether or not a file exists for the
overlay of abnormality outlines, etc.
-
"16-bit
PGM" file: overview of the real mammograms.
-
"ljpeg" file: contains four image files that are
compressed with lossless JPEG encoding.
-
"overlay" files: gives the keyword description for a
given abnormality in each view, while normal cases
will not have any overlay files.
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