[VIPSL] [Database & Software]

Database: Mammography

[DDSM]   [MIAS]


 

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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MIAS: Mammographic Image Analysis Society

The Mammography Image Analysis Society (MIAS), which is an organization of UK research groups interested in the understanding of mammograms, has produced a digital mammography database.
 (Available at: http://www.wiau.man.ac.uk/services/MIAS/MIASweb.html)
The X-ray films in the database have been carefully selected from the United Kingdom National Breast Screening Programme and digitized with a Joyce-Lobel scanning microdensitometer to a resolution of 50 μm × 50 μm,
a device linear in the optical density range 0-3.2 and representing each pixel with an 8-bit word. The database contains left and right breast images for 161 patients, and is available on a DAT-DDS tape. Its quantity consists of 322 images, which belong to three types such as Normal, benign and malignant.There are 208 normal, 63 benign and 51 malignant (abnormal) images.It also includes radiologist's `truth'-markings on the locations of any abnormalities that may be present. For each film, experienced radiologists give the type, location, scale, and other useful information of them. According to these experts’ descriptions, the database is conclude of four kinds of abnormities (architectural distortions, stellate lesions, circumscribed mass and calcifications). The database possesses an introduction file, which included following information:

  • type: which kinds mentioned above the abnormities belong to. 

  • sort: whether the abnormities are cancer or benign ones.

  • location and size: the original coordinates and diameters of the abnormities.

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Collected by Medical Image/Video Engineering Group, July, 2006.

 
 

[VIPSL] [Database & Software]