[Digital mammo-radiography (DMR) in mass screening for XXXX ].

@entity5 @entity1 @entity0
There are still many problems to be overcome in the development of mammographic apparatus suitable for mass screening purposes, but a certain number of these have been solved in the system discussed in the present paper. The equipment employs the technique of displaying I.I. images on a monitor by means of an image processor. This possesses the advantages of both film mammography and xeromammography, and the X-ray dose involved is small. The following advantages over film mammography are offered: The system is capable of clearly bringing out very minor differences of contrast. @entity5 shadows can be easily displayed. The X-ray dose is small: 0.03-0.05 R. The equipment is inexpensive to use. @entity1 positioning is simple, and examinations take little time. Long operator training programs are unnecessary. The system uses digital signals, and so automatic diagnosis is possible. Theoretically, at least, @entity5 as small as 0.2 mm in diameter can be detected. The future goal is discovering unpalpable @entity0 . DMR is useful because of low dose, low cost and high safety. In our study as screening for @entity0 , DMR system shows high sensitivity (87.1%), specificity (78.7%) in 391 cases of out @entity1 .
