MOVABLE DIAPHRAGM UNIT, X-ray GENERATING APPARATUS AND X-RAY IMAGING SYSTEM
First Claim
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1. An X-ray imaging system, comprising:
- a radiation generating apparatus which includes an X-ray generating unit configured to emit X-ray from a target upon irradiation with an electron beam, and a movable diaphragm unit which includes a restricting blade configured to restrict a passage range of the X-ray and a moving mechanism of the restricting blade; and
an X-ray detecting device configured to detect, on a detector plane, X-ray emitted from the radiation generating apparatus and has passed through an object,wherein the restricting blade has a predetermined thickness defined by a front surface on a target side and back surface of the opposite side of the front surface, and includes an end surface which communicates with the front surface and the back surface on a side on which the X-ray passes,the moving mechanism moves the restricting blade in a direction in which the restricting blade crosses the end surface,wherein, when a width of an eclipsed penumbra formed by X-ray emitted from a focal spot defined by an electron beam flux applied to the target, is in contact with the end surface, and arrives at a first virtual plane which includes the detector plane is denoted by h1 anda width of an attenuated penumbra formed by X-ray emitted from the focal spot, enters from the end surface, passes through the restricting blade, and arrives at the first virtual plane is denoted by h2, a relationship h2<
h1 is satisfied,a second virtual plane which is in contact with the end surface crosses a third virtual plane which includes the focal spot,when the restricting blade is moved away from a normal line extending from a center of the focal spot to the first virtual plane, a moving distance of a crossing line of the second virtual plane and a third virtual plane with respect to a center of the focal spot is shorter than a moving distance of the end surface with respect to the normal line.
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Abstract
A movable diaphragm unit is configured such that, when a restricting blade is moved away from a normal line extending from a center of a focal spot of X-ray to a first virtual plane including a detector plane, a moving distance of a crossing line of a second virtual plane including an end surface of the restricting blade and a third virtual plane including the focal spot with respect to a center of the focal spot becomes shorter than a moving distance with respect to the normal line of the end surface.
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Citations
16 Claims
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1. An X-ray imaging system, comprising:
- a radiation generating apparatus which includes an X-ray generating unit configured to emit X-ray from a target upon irradiation with an electron beam, and a movable diaphragm unit which includes a restricting blade configured to restrict a passage range of the X-ray and a moving mechanism of the restricting blade; and
an X-ray detecting device configured to detect, on a detector plane, X-ray emitted from the radiation generating apparatus and has passed through an object, wherein the restricting blade has a predetermined thickness defined by a front surface on a target side and back surface of the opposite side of the front surface, and includes an end surface which communicates with the front surface and the back surface on a side on which the X-ray passes, the moving mechanism moves the restricting blade in a direction in which the restricting blade crosses the end surface, wherein, when a width of an eclipsed penumbra formed by X-ray emitted from a focal spot defined by an electron beam flux applied to the target, is in contact with the end surface, and arrives at a first virtual plane which includes the detector plane is denoted by h1 and a width of an attenuated penumbra formed by X-ray emitted from the focal spot, enters from the end surface, passes through the restricting blade, and arrives at the first virtual plane is denoted by h2, a relationship h2<
h1 is satisfied,a second virtual plane which is in contact with the end surface crosses a third virtual plane which includes the focal spot, when the restricting blade is moved away from a normal line extending from a center of the focal spot to the first virtual plane, a moving distance of a crossing line of the second virtual plane and a third virtual plane with respect to a center of the focal spot is shorter than a moving distance of the end surface with respect to the normal line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- a radiation generating apparatus which includes an X-ray generating unit configured to emit X-ray from a target upon irradiation with an electron beam, and a movable diaphragm unit which includes a restricting blade configured to restrict a passage range of the X-ray and a moving mechanism of the restricting blade; and
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13. An X-ray generating apparatus, comprising:
- an X-ray generating unit configured to emit X-ray from a target upon irradiation with an electron beam, and a movable diaphragm unit which includes a restricting blade configured to restrict a passage range of the X-ray and a moving mechanism of the restricting blade; and
wherein the restricting blade has a predetermined thickness defined by a front surface on a target side and back surface of the opposite side of the front surface, and includes an end surface which communicates with the front surface and the back surface on a side on which the X-ray passes, the moving mechanism moves the restricting blade in a direction in which the restricting blade crosses the end surface, wherein the restricting blade consists of a plurality of stacked auxiliary blades, the plurality of auxiliary blades being relatively movable in a direction perpendicular to a direction in which the auxiliary blades are stacked and, when the restricting blade is moved away from the normal line, a moving distance of an auxiliary blade on the back surface side is longer than a moving distance of the auxiliary blade on the front surface side. - View Dependent Claims (14, 15)
- an X-ray generating unit configured to emit X-ray from a target upon irradiation with an electron beam, and a movable diaphragm unit which includes a restricting blade configured to restrict a passage range of the X-ray and a moving mechanism of the restricting blade; and
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16. A movable diaphragm unit device configured to be provided at forward respect to an extraction window of an X-ray generating unit generating an X-ray from a focal spot, comprising:
- a restricting blade configured to restrict a passage range of an X-ray and a moving mechanism of the restricting blade; and
wherein the restricting blade has an end surface on a side on which the X-ray passes, the moving mechanism moves the restricting blade in a direction in which the restricting blade crosses the end surface, wherein the restricting blade consists of a plurality of stacked auxiliary blades, the plurality of auxiliary blades being relatively movable in a direction perpendicular to a direction in which the auxiliary blades are stacked and, when the restricting blade is moved away from a normal line extending from a center of the focal spot, a moving distance of an auxiliary blade on the back surface side is longer than a moving distance of the auxiliary blade on the front surface side.
- a restricting blade configured to restrict a passage range of an X-ray and a moving mechanism of the restricting blade; and
Specification