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US 7,406,154 B2Granted
High speed modulation of switched-focus x-ray tube
AssigneeKoninklijke Philips Electronics N.V.
InventorTheodore A Resnick
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AssigneeKoninklijke Philips Electronics N.V.
InventorTheodore A Resnick
Estimating the term…
A dose-modulated irradiating system includes an x-ray tube (20) with at least a filament (80) for generating electrons, a cathode (84) and an anode (92) for accelerating and collimating the generated electrons into an electron beam (94), and an electrostatic grid with grid electrodes (110, 112) for steering the electron beam (94) on the anode (92). The anode (92) generates an x-ray beam (96) responsive to the electron beam (94). Grid biasing is provided for applying a time-varying electrical bias to the grid electrodes (110, 112) that produces a first time-varying intensity modulation of the electron beam (94). A current of the filament (80) is modulated to produce a second time-varying intensity modulation of the electron beam (94). A controller (52) controls cooperatively combining the first and second time-varying intensity modulations to produce a combined time-varying intensity modulation.
A dose-modulated irradiating system for an x-ray tube with a cathode including a filament that generates electrons which are focused into a beam and an anode that generates x-rays responsive to the electron beam, the dose-modulated irradiating system further including:
A method for dose-modulating an output of an x-ray tube that includes a cathode having a filament that generates electrons which are focused into a beam, an anode that generates x-rays responsive to the electron beam, and an electrostatic control electrode that electrostatically adjusts an intensity of the electron beam, the method including:
Dependencies are inferred from the claim text.