At breast biopsy, use of a simple disk that fits into the hub of the n
eedle can facilitate accurate placement of the needle with conventiona
l lesion localization techniques. This disk forms a surface onto which
the shadows of the localization crosshairs project so that the operat
or can advance the needle and maintain its alignment in the direction
of the mammography beam by using the field light. The insert has been
used successfully in more than 100 procedures.