Digital Database for Screening Mammography

Overview of Volume: benign_without_callback_01

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.

case3159 case3160 case3161 case3162 case3163 case3164 case3165 case3166
case3167 case3168 case3169 case3170 case3171 case3172 case3173 case3174
case3175 case3176 case3177 case3178 case3179 case3180 case3181 case3182
case3183 case3184 case3185 case3186 case3187 case3188 case3189 case3190
case3191 case3205 case3207 case3208 case3210 case3211 case3212 case3213
case3214 case3215 case3216 case3217 case3220 case3222 case3223 case3225
case3227 case3228 case3229 case3230 case3231 case3232 case3233 case3234
case3235 case3237 case3238 case3239 case3240 case3241 case3242 case3243
case3244 case3245 case3246 case3247 case3248 case3250 case3251 case3252
case3253 case3254 case3255