JPWO2021013853A5

JPWO2021013853A5 -

Info

Publication number: JPWO2021013853A5
Application number: JP2022503933A
Authority: JP
Publication date: 2023-07-28

Claims

An X-ray source for producing X-ray radiation of a first energy spectrum and a second energy spectrum, comprising:
a cathode for emitting an electron beam;
an anode for at least partially converting the electron beam into X-ray radiation;
an electron optical system for controlling a collision angle at which electrons of the electron beam impinge on the anode;
a power supply that applies a first tube voltage and a second tube voltage between the cathode and the anode, wherein the second tube voltage is higher than the first tube voltage;
a control circuit operably coupled to the electron optical system;
including
The control circuit is configured to cause the electrons of the electron beam to generate radiation X-rays of the first energy spectrum when the first tube voltage is applied, so that the electrons of the electron beam collide at the first average impingement angle. said electrons of said electron beam at a second average impingement angle to produce emitted x-rays of said second energy spectrum when impinging on an anode and said second tube voltage being applied; controlling the electron optics to impinge on the anode;
The X-ray source, wherein the second average impingement angle is less than the first average impingement angle.

2. The X-ray source of claim 1, wherein the second average impingement angle at which the electrons of the electron beam impinge on the anode is less than 70 degrees.

The electrons of the electron beam impinge on a first surface section of the anode when the first tube voltage is applied, and of the anode when the second tube voltage is applied. impinging on the second surface section;
3. An X-ray source according to claim 1 or 2, wherein the first surface section overlaps the second surface section.

4. The X-ray source of claim 3, wherein the center of said first surface section coincides with the center of said second surface section of said anode.

the electro-optical system includes a first deflection device and a second deflection device, the first deflection device switchable between a first state and a second state;
the control circuit switches the first deflection device from the first state to the second state in response to switching the power supply from the first tube voltage to the second tube voltage;
5. Any one of claims 1 to 4, wherein the first deflection device and the second deflection device provide deflection of the electron beam when the first deflection device is in the second state. X-ray source according to paragraph.

The electron optical system includes a focus device and a defocus device, the electron optical system is switchable between a third state and a fourth state,
The control circuit switches the electron optical system from the third state to the fourth state in response to switching the power supply from the first tube voltage to the second tube voltage,
6. Any one of claims 1 to 5, wherein in said fourth state said defocusing device first provides divergence of said electron beam and thereafter said focusing device provides focusing of said diverged electron beam. X-ray source according to .

7. The X-ray of claim 6, wherein the defocusing device provides stronger divergence of the electron beam when the electron optics are in the fourth state compared to the third state. source.

The anode includes a substrate at least partially coated with a first coating layer and a second coating layer, the first coating layer disposed between the second coating layer and the substrate. ,
the substrate comprises a first material that produces X-ray radiation;
wherein the first coating layer comprises a second material transparent to radiation X-rays and the electrons of the electron beam;
the second coating layer comprises a third material that produces X-ray radiation;
X according to any one of claims 1 to 7, wherein an X-ray filter is attached to said second coating layer for filtering X-ray radiation generated in said second coating layer. source.

the first material of the substrate is rhenium;
the second material of the first coating layer is diamond;
the third material of the second coating layer is tungsten;
9. The x-ray source of claim 8, wherein the x-ray filter comprises molybdenum.

10. An X-ray source according to claim 8 or 9, wherein the second coating layer has a thickness of less than 1 micrometer in surface sections where the electrons of the electron beam impinge on the second coating layer. .

an X-ray source according to any one of claims 1 to 10;
an X-ray detector;
including
An X-ray imaging system, wherein the X-ray detector is arranged to receive X-ray radiation emitted from the X-ray source.

further comprising a detector control circuit;
The detector control circuit controls the X-ray detector to generate first image data when the first tube voltage is applied between the cathode and the anode of the X-ray source. to generate second image data when the second tube voltage is applied;
12. The X-ray imaging system of claim 11, wherein an integration period for generating said first image data has the same time interval as compared to an integration period for generating said second image data.

a cathode for emitting an electron beam, an anode for at least partially converting said electron beam into X-ray radiation, a power supply for applying a tube voltage between said cathode and said anode, said electrons a first energy spectrum using an x-ray source including electron optics for controlling the impingement angle at which electrons of a beam impinge on said anode; and control circuitry operatively coupled to said electron optics. and a method for producing radiation x-rays of a second energy spectrum, comprising:
generating x-ray radiation of the first energy spectrum,
applying a first tube voltage with the power source;
The control circuit controls the electron optics such that the electrons of the electron beam impinge on the anode at a first average impingement angle to produce x-ray radiation of the first energy spectrum. a step;
including
generating x-ray radiation of the second energy spectrum,
applying a second tube voltage by the power supply, wherein the second tube voltage is higher than the first tube voltage;
The control circuit controls the electron optics such that the electrons of the electron beam impinge on the anode at a second average impingement angle to produce radiation x-rays of the second energy spectrum. the step of controlling, wherein the second average impact angle is less than the first average impact angle;
A method, including

A computer program comprising instructions for causing an X-ray source according to any one of claims 1 to 10 to perform the steps of the method according to claim 13.

15. A computer readable medium storing the computer program according to claim 14.