Digital Database for Screening Mammography

Overview of Volume: benign_without_callback_02

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.

The definition of benign_without_callback is an exam determined not to contain a cancer using only the screening exam films. No additional films or biopsy was done. These cases, however, contained something interesting enough for the radiologist to mark. All the markings for lesions in cases have been labeled with benign_without_callback . Thus, in the overlay file, the field name "PATHOLOGY" should not be read to imply that every benign without callback lesion 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.

case0419 case0420 case0421 case0422 case0423 case0424 case0425 case0426
case0427 case0428 case0430 case0431 case0432 case0434 case0435 case0436
case0437 case0438 case0439 case0440 case0441 case0442 case0443 case0444
case0445 case0446 case0447 case0448 case0449 case0450 case0451 case0452
case0453 case0454 case0455 case0456 case0459 case0460 case0461 case0462
case0463 case0464 case0465 case0467 case0468 case0469 case0470 case0472
case3427 case3428 case3429 case3430 case3431 case3442 case3444 case3445
case3446 case3447 case3448 case3449 case3450 case3451 case3452 case3453
case3684 case3685