An X-ray diffractometer has an X-ray source (10), a double pinhole collimator (14), a sample (22) mounted on a rotatable sample stage (20), an analyser crystal (30) and a detector (34).

The multi-pinhole collimator is disposed for radionuclide imaging using nuclear medicine therapies that include T1-201, Tc-99m, I- 123, In-111 or I- 131.

An X-ray diffractometer has an X-ray source (10), a double pinhole collimator (14), a sample (22) mounted on a rotatable sample stage (20), an analyser crystal (30) and a detector (34).

The collimator (100) comprises collimator material (150) and at least one collimator hole (110) defined by the surrounding collimator material (150).

The opening element may be employed to at least partially open the pinhole opening (4) to facilitate insertion of the instrument (6) through the pinhole opening (4).

The collimator in the collimator structure is made of a transparent material.

A multileaf collimator (12) may be present within the tertiary collimating cone.

The invention provides a collimator comprising a first collimator face, a second collimator face, and a stack region.

The collimator comprises adjacent pairs (5) of collimator leaves (10, 20).

In the axial direction, a collimator is a fan-beam collimator.

Light from the surface or interior of the sample passes through a pinhole lens which focuses the light on a pinhole for detection by an optical detector.

The variable-aperture collimator may be an IRIS collimator having multiple leaves configured to open and close an aperture of the IRIS collimator within which the fixed-aperture collimator is retained.

The collimator comprises a collimator body including a plurality of apertures disposed in a two-dimensional grid.

collimating optics Receptor arm in position

The focus of a fan beam collimator is offset from the centerline.