Abstract:
The present invention relates to a method, and a corresponding device, for testing a radius of curvature and/or for detecting inhomogeneities of a curved X-ray grating for a grating-based X-ray imaging device. The method comprises generating a beam of light diverging from a source point, propagating along a main optical axis and having a line- shaped beam profile. The method comprises reflecting the beam off a concave reflective surface of the grating,. A principal axis of the concave reflective surface coincides with the main optical axis and the source point is at a predetermined distance from a point where the main optical axis intersects the concave reflective surface. The method comprises determining whether a projection of the reflected beam in a plane at or near the source point is present outside a central region around the source point, in which an absence of this projection outside the central region indicates that a radius of curvature of the concave reflective surface corresponds to the predetermined distance and/or that the reflective surface is substantially homogeneously curved along a curve formed by the beam impinging on the concave reflective surface.
Abstract:
Novel and advantageous systems and methods for performing X-ray imaging by using an X-ray source with source grating functionality incorporated therein are provided. An electron beam can be electromagnetically manipulated such that the X-ray source emits radiation in a pattern that is the same as if the radiation had already passed through a source grating.
Abstract:
The invention relates to a source-detector arrangement (11) of an X-ray apparatus (10) for grating based phase contrast computed tomography. The source-detector arrangement comprises an X-ray source (12) adapted for rotational movement around a rotation axis (R) relative to an object (140) and adapted for emittance of an X-ray beam of coherent or quasi-coherent radiation in a line pattern (21); and an X-ray detection system (16) including a first grating element (24) and a second grating element (26) and a detector element (6); wherein the line pattern of the radiation and a grating direction of the grating elements are arranged orthogonal to the rotation axis; and wherein the first grating element has a first grating pitch varied dependent on a cone angle (β) of the X-ray beam and/or the second grating element has a second grating pitch varied dependent on the cone angle of the X-ray beam.
Abstract:
The invention relates to a grating device (1) for an X-ray imaging device, an interferometer unit (2), an X-ray imaging system, an X-ray imaging method, and a computer program element for controlling such device and a computer readable medium having stored such computer program element. The grating device (1) for an X-ray imaging device comprises a grating arrangement (10) and an actuation arrangement. The grating arrangement (10) comprises a plurality of grating segments (11). The actuation arrangement is configured to move the plurality of grating segments (11) with at least a rotational component between a first position and a second position. In the first position, the grating segments (11) are arranged in the path of an X-ray beam (30), so that the grating segments (11) influence portions of the X-ray beam (30). In the second position, the grating segments (11) are arranged outside the portions of the path of an X-ray beam (30), so that the portions of the X-ray beam (30) are unaffected by the grating segments (11).
Abstract:
A phase contrast imaging apparatus (MA) and related image processing method. The imaging apparatus includes a movable arm (AR) that carries a detector (D) and one or more interferometric gratings (G0,G1,G2). The imaging apparatus includes a rigidizer (RGD) to control the rigidity of at least the arm (AR) or a mounting (GM) for the gratings (G0,G1,G2). This allows controlling a drift of a Moiré pattern as detected in a sequence of readouts. A phase of the so controlled Moiré pattern can be used to calibrate the imaging apparatus by using the image processing method.
Abstract:
A modified phase shifting mask is used to improve performance over traditional Zernike phase contrast imaging. The configurations can lead to an improved imaging methodology potentially with reduced artifacts and more than one order of magnitude gain in photon efficiency, in some examples. Moreover, it can be used to yield a direct representation of the sample's phase contrast information without the need for additional specialized post-acquisition image analysis. The approach can be applied to both wide-field and scanning configurations by using a phase mask including a pattern of phase elements and an illumination mask, having a pattern of holes, for example, that corresponds to a pattern of the phase mask.
Abstract:
Die Erfindung betrifft eine Phasenkontrast-Röntgenbildgebungsvorrichtung (2), insbesondere für den Medizinbereich, umfassend eine Röntgenstrahlungsquelle (6) zur Generierung eines Röntgenstrahlungsfeldes und einen Röntgendetektor (8) mit einer eindimensionalen oder zweidimensionalen Anordnung von Pixeln (10), wobei zwischen der Röntgenstrahlungsquelle (6) und dem Röntgendetektor (10) ein Phasenkontrast-Differenzverstärker (14) positioniert ist, mit dessen Hilfe im Betrieb räumliche Phasenunterschiede im Röntgenstrahlungsfeld verstärkt werden.
Abstract:
Es wird ein bildgebendes System mit einer Röntgenquelle zum Aussenden von Röntgenstrahlung entlang einer zentralen Strahlachse, einem Bildgebungsbereich zum Positionieren eines zu untersuchenden Objekts und einem Röntgendetektor angegeben. Zwischen dem Bildgebungsbereich und dem Röntgendetektor ist ein Linsenfeld aus einer Mehrzahl von für Röntgenstrahlung fokussierenden Röntgenlinsen angeordnet. Weiterhin wird ein Verfahren angegeben, bei dem ein erfindungsgemäßes bildgebendes System verwendet wird, um mit Hilfe von Röntgenstrahlung eine durch ein Objekt bewirkte Verzerrung der Wellenfront der Röntgenstrahlung mit Hilfe des Röntgendetektors zu vermessen.
Abstract:
The invention provides an X-ray apparatus and an X-ray measurement method that can increase sensitivity to a positional shift of an X-ray as compared with related art. An X-ray apparatus includes a splitting element (103) configured to spatially split an X-ray from an X-ray generator (101) and form an X-ray beam; a detector (106) configured to detect an intensity of the X- ray beam, which has been split by the splitting element and has passed through a detection object (104), the detector including a plurality of pixels; and an absorbing element (105) arranged at a boundary of two pixels from among the plurality of pixels included in the detector and configured to absorb part of the X-ray beam. The X-ray beam is configured to discretely irradiate the two pixels of the detector.