Digital Database for Screening Mammography

Overview of Volume: benign_12

This table contains links to overview pages for the cases in this volume. Each overview page contains the ics file, "thumbnails" of the images associated with the case, and the overlay markings of the abnormalities. The "thumbnail" images are meant for visual browsing of the cases only, and are not suitable for any form of experimental work. The thumbnail images were blurred, subsampled, sharpened and converted to eight bits per pixel. Thus, they contain artifacts introduced by this processing (i.e., aliasing, ringing, re-quantization, clipping etc.). Any experimental work should start with the full raw images for the case.

Benign case are formed from screening exams in which something suspicious was found, but was determined to not be malignant. The determination of benign condition was most often made by pathology. However, in some cases, ultrasound or some other accepted means was used to determine benign condition. Thus, in the overlay file, the field name "PATHOLOGY" should not be read to imply that every benign abnormality was sent to pathology. The choice of field name was made early in the project, and is maintained for compatibility with earlier versions of the database. The outlines of all suspicious regions have been transcribed from markings made by an experienced mammographer. In almost all cases, an abnormality is visible in both views of the breast. However, there are a cases where an abnormality seen in one view is not visible in the other view. This is most often due to the fact that the CC and MLO views do not image exactly the same tissue, but in some cases the abnormality may simply not present any visible signs in one view.

The "ics" header file contains the following information. The "DATE_OF_STUDY" field gives the date that the mammogram was performed. The "PATIENT_AGE" field gives the age of the patient at the time that the mammogram was performed. The "DENSITY" field gives an ACR BI-RADS breast density rating for the case, as assigned by an experienced mammographer. The "DIGITIZER" field indicates the equipment used to digitize the mammogram films. The "LEFT_CC," "LEFT_MLO," RIGHT_CC," and "RIGHT_MLO" fields specify the size of the corresponding images and whether or not a file exists for the overlay of abnormality outlines. The "FILM," "FILM_TYPE," "SEQUENCE" and "DATE_DIGITIZED" fields should be disregarded. They are being maintained for compatibility with earlier versions of the database, but do not contain useful information.

The individual overlay files contain keywords to describe each abnormality. They also contain an ACR BI-RADS assessment code for each abnormality. And they contain a mammographer-assigned "subtlety rating" on a scale of 1 to 5, where 1 is "subtle" and 5 is "obvious." The mammographer was not constrained to provide the same keyword description for a given abnormality in each view. Unusual objects (e.g., pacemaker, breast implant) may be visible in some images. These are not identified by an overlay file.

We strongly encourage that whenever research results are presented using cases from this database, a histogram of the subtlety rating of the images used in the research also be presented.

You can order the complete volume on tape. Click here for an order form. Please note that you should be using the lastest version of DDSMView to view the complete cases. You can get it here or from our ftp site ( in the directory "pub/DDSM/software/bin" using anonymous ftp.

case1740 case1795 case1830 case1843 case1867 case1868 case1869 case1870
case1876 case1877 case1878 case1879 case1880 case1881 case1882 case1883
case1884 case1885 case1886 case1888 case1889 case1890 case1891 case1909
case1910 case1911 case1912 case1913 case1914 case1915 case1916 case1917
case1918 case1919 case1920 case1921 case1922 case1923 case1924 case1925
case1926 case1927 case1934 case1935 case1936 case1937 case1938 case1939
case1940 case1941 case1942 case1943 case1944 case1945 case1946 case1947
case1948 case1949 case1950 case1952 case1953 case1954 case1982 case2001