摘要:
An X-ray detector of conventional design having photodiodes and scintillator material arranged thereon is able, given a suitable read-out frequency matching a low dose to which the flat-panel X-ray detector is subjected, to obtain images during each read-out operation, from which images the energy of individual X-ray quanta can be derived. An item of X-ray-spectrum information about pixels in a grid pattern can be obtained thereby.
摘要:
A sensor element is provided for conversion of x-radiation into an electrical measurement signal, the sensor element including an x-radiation-absorbing fluid arranged in a housing, and a pressure sensor arranged to detect a pressure of the fluid on the pressure sensor and convert the detected pressure into an electrical measurement signal. A plurality of such sensor elements may be arranged in a matrix-type arrangement to form an x-ray detector.
摘要:
In a method for producing a parylene coating on a substrate containing an integrated electronic component which is e.g. an x-ray detector, the following steps are provided: vaporization of parylene; pyrolyzation of the vaporized parylene; polymerization of the pyrolyzed parylene, the polymerized parylene being deposited on a cooled substrate. The method provides controllable, patterned deposition of parylene on the cooled and/or heated substrate, the advantage being that x-ray converters, for example, can be anticorrosively encapsulated and a penetration depth of the parylene between phosphor needles or storage phosphor needles can be controlled, resulting in an improved resolution and improved modulation transfer function of electronic components.
摘要:
An x-ray detector has a light sensitive detector that is substantially transparent to x-rays, and has opposite sides that are permeated by incoming x-rays. At each of said opposite sides, a scintillator is arranged on the sensor that converts the incoming x-rays into light at each of said opposite sides.
摘要:
A thermionic emitter has a flat emission surface that is subdivided by slits into generally spiral or serpentine conductor sections, the surface having legs extending therefrom that form part of the current supply terminals and that also serve for securing the emitter. Each of these legs has a portion with a longitudinal electrical resistance that is elevated compared to that of the conductor sections, such that areas of maximum temperature migrate from the middle of the emitter to its edges as the heating current increases.
摘要:
An X-ray tube has a vacuum housing that accepts a cathode and an anode and that is provided with an electrically conductive beam exit window. During operation of the X-ray tube, the beam exit window lies at a negative potential and is electrically conductively connected via a resistance to a potential that is positive relative to the negative potential, this resistance being dimensioned such that, during operation of the X-ray tube, the difference in potential between the negative potential of the beam exit window and the positive potential lies on the order of magnitude of a few kilovolts.
摘要:
Systems and methods are provided for generating X-ray pulses during X-ray imaging. A high voltage of an X-ray tube is automatically switched off. The tube voltage decays and upon reaching a predefined threshold value of the tube voltage or a predefined waiting time after switching off the high voltage, a grating voltage of a grating arranged between an emitter and an anode of the X-ray tube is automatically switched on. No electrons reach the anode from the emitter, and the tube current drops to the value zero.
摘要:
An X-ray detector of conventional design having photodiodes and scintillator material arranged thereon is able, given a suitable read-out frequency matching a low dose to which the flat-panel X-ray detector is subjected, to obtain images during each read-out operation, from which images the energy of individual X-ray quanta can be derived. An item of X-ray-spectrum information about pixels in a grid pattern can be obtained thereby.
摘要:
In a method to detect the pressure in an x-ray tube having a cathode of the x-ray tube that is heated with a heater current, and wherein electrons are accelerated between the cathode and an anode by an applied x-ray tube voltage, the heater current is measured, a tube current corresponding to the tube -ray voltage is measured, the difference between the measured heater current and the measured tube current is determined or the temporal change of the measured heater current or of the measured tube current is determined, the difference or the temporal change is compared with predetermined calibration values, and a value representing the pressure in the x-ray tube is determined from the comparison.
摘要:
Systems and methods are provided for generating X-ray pulses during X-ray imaging. A high voltage of an X-ray tube is automatically switched off. The tube voltage decays and upon reaching a predefined threshold value of the tube voltage or a predefined waiting time after switching off the high voltage, a grating voltage of a grating arranged between an emitter and an anode of the X-ray tube is automatically switched on. No electrons reach the anode from the emitter, and the tube current drops to the value zero.