X-ray tube
OwnerMichael Danosinventor
Life of this patent
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Abstract
An X-ray tube for greatly enhancing the output of photons relative to a standard tube includes a source of an electron beam focused on a target at an angle of approximately 10.degree. to produce high energy photons emitted at an angle along their centerline of 5.degree. to 15.degree., both angles referring to the surface of the target. Reduction of impurgement of scattered electrons on the tube window is affected in various ways such as use of a magnet to deflect electrons from the photon stream or locating the window out of alignment with the most intense scattered electrons. Scattered electrons are also absorbed by an essentially zero albedo shield disposed in the path of the majority of the scattered electrons not directed at the window.
Claims30
The method of increasing the X-ray emission power of an X-ray tube for the same X-ray emission geometry and target heat load as used in present-day X-ray tubes comprising the steps of
- forming a beam of electrons,
- aiming the beam of electrons at an X-ray producing target at an angle to the surface of the target determined by the Monte Carlo formula to produce the maximum X-ray beam power per unit of heat deposited in the target,
- focusing the beam of electrons to a focal spot on the target surface, with the same size and uniformity as obtained with an incident electron beam angle to anode of 80.degree.,
- utilizing the photons emitted from the target at an angle of elevation of approximately 7.degree. to 13.degree. to the surface of the target.
An X-ray tube comprising
- a source of electrons,
- a target having a surface for producing photons upon bombardment by electrons,
- means for focusing a beam of electrons from said source of electrons on said target at an angle determined by the Monte Carlo formula to produce the maximum X-ray power per unit of heat developed in the target,
- a window for passing photons emitted by said target,
- said window located at an angle to the surface of said target of approximately 7.degree. to 13.degree..
The method of increasing the X-ray emission power and enhancing the higher energy region of an unfiltered X-ray spectrum such that the distribution of X-ray intensities over the high energy region of the continuous spectrum, 50 to 100% of the incident electron energy, relative to the energy below the high energy region of an X-ray tube for the same X-ray emission geometry and target heat load is greater than the corresponding X-ray intensities for an X-ray tue in which the incident electron beam angle is in the region of 80.degree. comprising the steps of
- forming a beam of electrons,
- aiming the beam of electrons at an X-ray producing target at an angle to the surface of the target determined by the Monte Carlo formula to produce the maximum X-ray power per unit of heat developed in the target,
- focusing the beam of electrons to a focal spot on the target surface, with the same size and uniformity as obtained with an incident electron anode of 80.degree.,
- utilizing the photons emitted form the target at an angle of elevation of approximately 7.degree. to 13.degree. to the surface of the target.
The method of increasing the X-ray emission power of an X-ray tube for the same X-ray emission geometry and target heat load as used in present-day X-ray tubes comprising the steps of
- forming a beam of low energy electrons of a voltage below 300 keV,
- aiming the beam of electrons at an X-ray producing target at an angle to the surface of the target determined by the Monte Carlo formula to produce the maximum X-ray beam power per unit of heat deposited in the target,
- focusing the beam of electrons to a focal spot on the target surface, with the same size and uniformity as obtained with an incident electron beam angle to anode of 80.degree.,
- utilizing the photons emitted from the target at an angle of elevation of approximately 7.degree. to 13.degree. to the surface of the target.
An X-ray tube comprising
- a source of low energy electrons below 300 keV,
- a target having a surface for producing photons upon bombardment by electrons,
- means for focusing a beam of electrons from said source of electrons on said target at an angle determined by the Monte Carlo formula to produce the maximum X-ray power per unit of heat developed in the target,
- a window for passing photons emitted by said target,
- said window located at an angle to the surface of said target of approximately 7.degree. to 13.degree..
The method of increasing the X-ray emission power and enhancing the higher energy region of an unfiltered X-ray spectrum such that the distribution of X-ray intensities over the high energy region of the continuous spectrum, 50 to 100% of the incident electron energy, relative to the energy below the high energy region of an X-ray tube for the same X-ray emission geometry and target heat load is greater than the corresponding X-ray intensities for an X-ray tube in which the incident electron beam angle is in the region of 80.degree. comprising the steps of
- forming a low energy beam of electrons below 300 keV,
- aiming the beam of electrons at an X-ray producing target at an angle to the surface of the target determined by the Monte Carlo formula to produce the maximum X-ray power per unit of heat developed in the target,
- focusing the beam of electrons to a focal spot on the target surface, with the same size and uniformity as obtained with an incident electron anode of 80.degree.,
- utilizing the photons emitted from the target at an angle of elevation of approximately 3.degree. to 13.degree. to the surface of the target.
Dependencies are inferred from the claim text.