IV.B.5.   A viewbox for mammographic films should have a brightness of approximately:

    a.     3.5 foot-candles.

    b.     3.5 lumens.

    c.     3500 luxes.

    d.     3500 nits.    Correct.

    Discussion:     This is a recommendation by the ACR.

    Reference:     Physical Principles of Medical Imaging, 2nd. Edition. p. 57