Abstract:
A focus-detector arrangement and an X-ray apparatus for generating projective or tomographic phase contrast recordings of a subject are disclosed. In at least one embodiment, the focus-detector arrangement includes a radiation source with a focus, arranged on a first side of the subject, for generating a fan-shaped or conical beam of rays; at least one X-ray optical grating arranged in the beam path, with at least one phase grating arranged on the opposite second side of the subject in the beam path generating an interference pattern of the X-radiation preferably, in a particular energy range; and an analysis-detector system which detects at least the interference pattern generated by the phase grating in respect of its phase shift with position resolution. According to at least one embodiment of the invention, at least one X-ray optical grating including bars which are free from overhangs form shadows in the beam path of the fan-shaped or conical beam of rays.
Abstract:
In a shockwave system with a shockwave source for treatment of a patient with shockwaves, a control and evaluation unit for evaluating an input signal supplied directly thereto that is correlated with a blood pressure value of the patient determined during the treatment, and controls the shockwave source dependent on the input signal.
Abstract:
In a method to determine an operating parameter of a shockwave source for the generation of a shockwave to disintegrate a calculus in a patient by a shockwave lithotripsy, a characteristic of the patient and/or of the calculus is determined before and/or during the shockwave lithotripsy and the operating parameter is automatically determined dependent on the characteristic. A device for determining an operating parameter of a shockwave source for the destruction of a calculus in a patient has an acquisition and control unit for determination and/or input of a characteristic of the patient and/or of the calculus, and for automatic determination of the operating parameter dependent on the characteristic.
Abstract:
In a method and examination apparatus for generating three-dimensional, multiply resolved volume images of an examination subject on the basis of two-dimensional projection images that can be registered with the apparatus, as radiation images obtained with a radiation source and a radiation receiver in an exposure procedure of the examination subject, a set of two-dimensional projection images is registered, one part of the set being registered with low resolution and one part of the set being registered with high resolution, transforming the high-resolution projection images are transformed so as to have the same scale, the same sampling rate and the same resolution as the low-resolution projection images (downscaling), and a three-dimensional volume image with low resolution is generated on the basis of the low-resolution projection images as well as the transformed projection images and a high-resolution volume image is generated on the basis of the high-resolution projection images.
Abstract:
In a method and for MR apparatus PPA imaging with radial data acquisition in magnetic resonance tomography, k-space is under-scanned by acquiring a number of projections φ with a coil array of M component coils, a shift operator C(±nΔk) is determined for a projection φi on the basis of measured magnetizations along a projection φi±α0 that encompasses with φi an angle α0, with n=1, 2, . . . , M−1, the shift operator C(±nΔk) is applied to individual points of projection φi in order to obtain calculated projection points, the determination and the application of the shift operator C(±nΔk) are repeated for all projections φ, and an image is reconstructed in the spatial domain on the basis of the projections, which have been completed purely computationally.
Abstract:
In a method to create dual energy x-ray image data of a predetermined volume segment of an examination subject with an x-ray system, a low-energy x-ray image data of the volume segment is created, a high-energy x-ray image data of the volume segment is created, the low-energy x-ray image data is subtracted from the high-energy x-ray image data to create the dual energy x-ray image data. An x-ray filter that consists essentially of titanium is used in the creation of the dual energy x-ray image data.
Abstract:
In this device and the associated method, a connection unit that can be attached to an arm bearing an x-ray source and an x-ray receiver is fashioned such that said connection unit compensates for a pivot movement of the arm so that a compression unit arranged at the connection unit remains stationary during a pivot movement.
Abstract:
A mammography apparatus has at least one x-ray source to emit x-ray radiation and an x-ray detector with a number of pixels. The mammography apparatus is designed so that the x-ray radiation is emitted into the breast tissue of a patient at a number of positions, and the x-ray radiation is detected by the x-ray detector after it has passed through the breast tissue. The positions have different distances from the shoulder-to-shoulder axis of the patient.
Abstract:
A method to show a predetermined volume segment of an examination subject by means of a tomosynthesis apparatus, and a correspondingly designed tomosynthesis apparatus, operate as follows. A radioscopy test is implemented in which x-rays with a defined radiation dose are generated by an x-ray source, the x-rays traversing the predetermined volume segment and strike a detector, and an intensity of the x-rays striking the detector is determined. A first radiation dose of x-rays is calculated to create a two-dimensional exposure depending on the determined radiation dose and the intensity. A second radiation doses of x-rays is calculated to implement a tomosynthesis depending on the determined radiation dose and the intensity. A tomosynthesis of the predetermined volume segment is implemented with x-rays that traverse the predetermined volume segment and strike the detector, the x-rays being generated by an x-ray source with the second radiation doses.
Abstract:
In a method and device for generating a tomosynthetic 3D x-ray image, a number of digital x-ray images of an examination subject are acquired at respectively different projection angles, within a limited angle range, using an x-ray source and a digital x-ray detector. At an initial position for a selected projection angle, a spatially-fixed reference point is projected onto a partial region of the acquisition surface of the x-ray detector. For each further projection angle, a corresponding partial region on the acquisition surface is automatically determined. The tomosynthetic 3D image is reconstruction exclusively using image data from the respective partial regions.