Apparatus for measuring the momentum transfer spectrum of elastically scattered X-ray quanta and method of determining this momentum transfer spectrum
View Patent ↗An apparatus for measuring the momentum transfer spectrum of elastically scattered X-ray quanta includes an anode having a focus extended in Y-direction which emits X-radiation in the X-direction, a primary collimator extending in the Y-direction which allows through only X-radiation aimed at a single isocenter, wherein the isocenter is the originating point of a Cartesian coordinates system, an examination area, a scatter collimator arranged between said examination area and the isocenter and configured to allow through only scattered radiation from an object introduced in said examination area, wherein the radiation is emitted at a fixed angle of scatter (Θ), and a detector. The X-component of a scatter voxel of the object is imaged onto the Z-component of the detector, and the detector is located in the Y-Z plane, distanced from the Z-axis, and developed as a two-dimensional pixellated detector having a plurality of energy-resolving detector elements.
1. Apparatus for measuring a momentum transfer spectrum of elastically scattered X-ray quanta comprising:
an anode having a focus extended in a Y-direction which emits X-radiation in an X-direction;
a primary collimator extending in the Y-direction which allows through only X-radiation aimed at a single isocentre, wherein the isocentre is an originating point of a Cartesian coordinates system;
an examination area;
a scatter collimator arranged between said examination area and the isocentre and configured to allow through only scattered radiation from an object introduced in said examination area, wherein the radiation is emitted at a fixed angle of scatter (Θ); and
a detector, wherein an X-component of a scatter voxel of the object is imaged onto a Z-component of the detector, and the detector is located in a Y-Z plane, distanced from a Y-axis, and developed as a two-dimensional pixellated detector having a plurality of energy-resolving detector elements, the plurality of detector elements extending at least in the Y-direction.
2. Apparatus according to claim 1 wherein each of the plurality of individual detector elements is independently read out.
3. Apparatus according to claim 1 wherein each of the plurality of detector elements comprises CdZnTe.
4. Apparatus according to claim 1 wherein a length of the extended focus in the Y-direction and the single isocentre are matched to each other such that there is an opening angle of the X-ray beam of 60° to 120°.
5. Apparatus according to claim 4 wherein the opening angle is 90° at the isocentre.
6. A method of determining the momentum transfer spectrum measured in the apparatus according to claim 1 wherein the measurement values of each of the plurality of detector elements is corrected depending on a primary beam emission angle (α) and on a position of the detector element relative to the scatter voxel and the angle of scatter (Θ) resulting therefrom.