Abstract:
A system and a method of controlling the leaves (210) of a radiation aperture (200) are disclosed. The system and method allow the delivery of different radiation fluences to different parts of a volume (100) in a single rotation of the aperture (200) around the volume. In embodiments, different radiation fluences are achieved by radiating different parts of the volume (100) from opposing positions (340, 350, 360, 370) of the aperture (200) around the volume (100). In further embodiments, different radiation fluences are achieved by assigning different leaf pairs to radiate different parts of the volume (100).
Abstract:
Die Erfindung betrifft ein Hochleistungs-Strahlverschluss- und Spaltsystem für Synchrotronstrahlung, mit einer Längsachse, die im Betrieb der Strahlachse der Synchrotronstrahlung entspricht, und wenigstens zwei Synchrotronstrahlungsabsorbern mit gegen die Längsachse geneigten Absorptionsflächen zum streifenden Einfall der Synchrotronstrahlung, wobei die Synchrotronstrahlungsabsorber symmetrisch gegenüberliegend zur Längsachse angeordnet und mechanisch gekoppelt zur symmetrisch gegenläufigen Bewegung senkrecht zur Längsachse gegeneinander beweglich gelagert und mit einem einzigen steuerbaren Antrieb einstellbar sind, so dass mit ihren Absorptionsflächen ein Spalt variabler Breite definierbar ist. Erfindungsgemäß ist vorgesehen, dass die beiden Synchrotronstrahlungsabsorber (1, 2) von zwei Präzisionshubtischen (10, 20) getragen werden, die jeweils einen darin horizontal verschiebbaren Antriebskeil (12, 22) und einen komplementären, vertikal verschiebbaren Hubkeil (14, 24) haben, der den zugehörigen Synchrotronstrahlungsabsorber trägt, wobei die Präzisionshubtische (10, 20) einander in Längsachsenrichtung (3) gegenüberliegend, mit ihren Antriebskeilen (12, 22) in Längsachsenrichtung entgegengesetzt orientiert angeordnet sind und die Antriebskeile (12, 22) durch einen Stößel (30) miteinander verbunden sind, dessen Position in Längsachsenrichtung durch einen Antrieb (34, 36) einstellbar ist, so dass durch Verschieben des Stößels (30) in Längsachsenrichtung die Hubkeile (14, 24) der Präzisionshubtische vertikal gegenläufig verstellbar sind.
Abstract:
Der Lamellenkollimator (2), insbesondere für ein Strahlentherapiegerät (54) umfasst mehrere motorisch in einer Verstellrichtung (6) verschiebbare Lamellen (4) zur Vorgabe einer Kontur (10) eines Strahlengangs eines Röntgenstrahls (58). Jede Lamelle (4) weist eine Positionsmessvorrichtung (18) mit einem verschiebbaren Messelement (z.B. 34) auf, das unmittelbar an der jeweiligen Lamelle (4) befestigt ist. Hierdurch wird ein kompakter Aufbau erreicht.
Abstract:
An apparatus and method of attenuating radiation includes oscillating at least one fluid having a radiation attenuating property between at least two chambers, incident to applied radiation. The radiation attenuating device includes at least two communicating adjacent chambers, at least one fluid having radiation attenuating properties moveable between the at least two chambers, and a control circuit configured to oscillate the at least one fluid between the chambers.
Abstract:
The invention provides a radiation detection system, comprising a detector plate that is sensitive to radiation, and an imaging system that is arranged to form an image of an object to be examined on the detector plate and that comprises a first slit plate with at least a first slit, and a second slit plate that is positioned between the first slit plate and the detector plate and with a second slit that makes a non-zero angle with the first slit, wherein the first and second slit together define a pinhole passage, wherein at least one of the at least one first and second slits may be changed in least one of its width or its position with respect to at least one of the other of the at least one first and second slits and the detector plate. With the radiation detection device according to the invention, it is achieved that many more settings of the device become possible for examination with radiation.
Abstract:
A system for monitoring the operation of a medical device including a movable portion and a controller for controlling the movable portion. The system includes a motion verification device directly coupled to the movable portion. The system is configured to determine motion data for the motion verification device. In one method of operation, the method includes moving the movable portion, determining motion data for the motion verification device, and monitoring the motion data.
Abstract:
Devices and methods for collimation of a penetrating radiation source, such as an x- ray source, for the purpose of creating a scanning beam, as might be employed for purposes of imaging. A first scanning element, constrained to move about a first axis, has at least one aperture for scanning radiation from inside the first scanning element to outside the first scanning element. A second- scanning element constrained to move with respect to a second axis, typically identical to the first, has at least one aperture for scanning radiation that has been transmitted through the first scanning element across a region of an inspected object.
Abstract:
An apparatus and method to deliver intensity modulated radiation therapy by irradiating a treatment volume with rotation of the radiation beam. The system includes a collimation device comprising a two-dimensional array of pivoting attenuating leaves, which are temporarily placed into the radiation beam path as the gantry rotates around the patient. The leaves are independently movable between a first position and a second position. The radiation beam intensity is modulated by controlling the time that each leaf is present to attenuate the beam.
Abstract:
A two-dimensional x-ray scattering camera includes a source, an optic, a detector, and a pair of collimating blocks. The source emits x-ray beams that are reflected by the optic towards a sample. The detector detects scattering from the sample, the pair of collimating blocks is positioned between the optic and the detector to collimate the beam. A bottom surface of one block is substantially parallel a top surface of the other block, and the blocks are rotatable relative to the beam about a pivot. The system forms a two- dimensional beam that is symmetric about the primary beam axis at the detector position, regardless how the beam is collimated by the collimating blocks. The system therefore eliminates smearing and can be used for anisotropic small angle scattering at high resolution and low Q min .
Abstract:
Die Erfindung betrifft einen Kollimator mit einstellbarer Brennweite, insbesondere in Röntgenprüfanlagen, mit einem Außenteil mit einer konischen Innenfläche und einem Innenteil mit einer konischen Außenfläche, die fest beabstandet miteinander verbunden sind, sowie mindestens einem beweglich zwischen Innen- und Außenteil angeordneten Konus-Schiebeteil.