X-ray generator with a limiting device
AssigneeShimadzu Corporation
InventorsMasao Iinuma, Hajime Takemoto
Life of this patent
Estimating the term…
Abstract
An X-ray tube (3) is rotated about its focal point along a plane perpendicular to a body axis of a patient by an X-ray tube rotation driver and thus the X-ray irradiation field moves. When the side of the X-ray irradiation field reaches an edge detector (6a) in the edge part of the flat panel detector, the edge detector detects X-ray and provides a signal to a controller. The controller controls the X-ray limiting device (4a) to move shield blades thereof to limit the range of the X-ray irradiation field. The above structure makes it possible to move the center of the X-ray irradiation field without moving the patient and also to prevent the X-ray irradiation field from going outside of the flat panel detector.
Claims15
An X-ray apparatus, comprising:
- an X-ray tube;
- a solid state flat detector opposing said X-ray tube across a patient being examined, the patient defining a body axis;
- an X-ray limiting device for limiting X-rays from said X-ray tube;
- a driver for rotating said X-ray tube and said X-ray limiting device about a stationary axis disposed above the patient and extending parallel to the body axis, wherein the driver rotates said X-ray tube and said X-ray limiting device in an arc defining a plane oriented perpendicularly to the body axis;
- an edge detector for detecting x-rays irradiated onto an edge part of said solid state flat detector;
- a controller for receiving a signal from said edge detector and controlling, with said signal, said X-ray limiting device so that X-rays do not go outside of said solid state flat detector.
An X-ray apparatus, comprising:
- an X-ray tube;
- a solid state flat detector opposing said X-ray tube across a patient being examined, the patient defining a body axis;
- an X-ray limiting device for limiting X-rays from said X-ray tube;
- a driver for rotating said X-ray tube and said X-ray limiting device about a stationary axis disposed above the patient and extending parallel to the body axis in an arc defining a plane oriented perpendicularly to the body axis;
- a detector for detecting a rotation angle of said X-ray tube, and providing a signal related to said rotation angle;
- and
- a controller for receiving said signal from said detector and controlling said X-ray limiting device so that X-rays from said X-ray tube do not go outside of said solid state flat detector,
- wherein said controller calculates a permissible aperture size defined as a distance between a center of an X-ray irradiation field and an edge of said solid state flat detector, and controlling said X-ray limiting device so that an outer half of X-rays from said X-ray tube is limited to within said permissible aperture size.
An X-ray apparatus, comprising:
- an X-ray tube;
- a solid state flat detector opposing said X-ray tube across a patient being examined, the patient defining a body axis;
- an X-ray limiting device for limiting X-rays from said X-ray tube;
- a driver for rotating said X-ray tube and said X-ray limiting device about a stationary axis disposed above the patient and extending parallel to the body axis in an arc defining a plane oriented perpendicularly to the body axis;
- a detector for detecting a rotation angle of said X-ray tube, and providing a signal related to said rotation angle;
- and
- a controller for receiving said signal from said detector and controlling said X-ray limiting device so that X-rays from said X-ray tube do not go outside of said solid state flat detector,
- wherein said controller calculates a permissible aperture size based on an angle between an edge of said solid state flat plate detector and a center of an X-ray irradiation field, and controlling said X-ray limiting device so that an outer half of X-rays from said X-ray tube is limited to within said permissible aperture size.
Dependencies are inferred from the claim text.