An apparatus for imaging a field of view, according to an embodiment of
the present invention, comprises an x-ray source positioned adjacent to
the field of view, a source mask located between the x-ray source and the
field of view having at least one source aperture defined therethrough,
and an emission detector, such as a gamma camera, adjacent to the field
of view. The apparatus may allow substantially concurrent x-ray imaging
and gamma imaging of the field of view.