I.B.21.   The spatial resolution of an imaging system is most directly related to:

    a.   Visibility of large low contrast objects.

    b.   Visibility of noisy images.

    c.   Visibility of soft tissues.

    d.   Visibility of anatomical detail.    Correct.

    Discussion:   Spatial resolution is often measured to evaluate system blurring which affects visibility of anatomical detail.

    Reference:   Physical Principles of Medical Imaging, 2nd. Edition.   p. 258