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US 10,238,357 B2Granted
X-ray CT apparatus and scanning method
AssigneeHitachi, Ltd.
InventorsKana Tanaka, Koichi Hirokawa, Yukio Kumagai
Life of this patent
Estimating the term…
Abstract
In order to provide an X-ray CT apparatus and the like capable of obtaining an optimal X-ray dose for a dynamically changing X-ray irradiation region and reliably irradiating the X-ray irradiation region in a case where X-rays are applied with a spreading angle in a body axis direction, an X-ray CT apparatus 1 dynamically changes an X-ray irradiation region 201 for each view angle during scanning, and a system control device 124 changes a position of an analysis line 300 used to calculate an optimal tube current during scanning according to a position of the X-ray irradiation region 201 at each view angle, so as to obtain an optimal irradiation X-ray dose.
Claims17
An X-ray CT apparatus comprising:
- an X-ray source that irradiates an object with X-rays;
- a collimator that restricts an irradiation range of the X-rays applied from the X-ray source;
- an X-ray detector that is disposed to oppose the X-ray source and detects X-rays having been transmitted through the object;
- a rotation board that is mounted with the X-ray source and the X-ray detector and is rotated around the object;
- a bed that carries the object into and out of an X-ray irradiation region;
- an image reconstruction device that reconstructs an image of the object on the basis of a transmitted X-ray dose detected by the X-ray detector;
- a display device that displays the image reconstructed by the image reconstruction device;
- an X-ray irradiation region calculation unit that calculates an X-ray irradiation region in a body axis direction at each view angle on the basis of an examination condition;
- an X-ray dose calculation unit that calculates an irradiation X-ray dose at each view angle according to an X-ray irradiation region calculated by the X-ray irradiation region calculation unit;
- and
- a control unit that controls scanning so that the irradiation X-ray dose calculated by the X-ray dose calculation unit is applied to the X-ray irradiation region at each view angle calculated by the X-ray irradiation region calculation unit;
- wherein the X-ray irradiation region includes a position deviated in the body axis direction relative to a position of the X-ray source, and
- wherein the X-ray dose calculation unit sets an analysis line for determining the irradiation X-ray dose in the X-ray irradiation region, and calculates the irradiation X-ray dose on the basis of an analysis result in the set analysis line.
10 more elements
An X-ray CT apparatus comprising:
- an X-ray source that irradiates an object with X-rays;
- a collimator that restricts an irradiation range of the X-rays applied from the X-ray source;
- an X-ray detector that is disposed to oppose the X-ray source and detects X-rays having been transmitted through the object;
- a rotation board that is mounted with the X-ray source and the X-ray detector and is rotated around the object;
- a bed that carries the object into and out of an X-ray irradiation region;
- an image reconstruction device that reconstructs an image of the object on the basis of a transmitted X-ray dose detected by the X-ray detector;
- a display device that displays the image reconstructed by the image reconstruction device;
- an X-ray irradiation region calculation unit that calculates an X-ray irradiation region in a body axis direction at each view angle on the basis of an examination condition;
- an X-ray dose calculation unit that calculates an irradiation X-ray dose at each view angle according to an X-ray irradiation region calculated by the X-ray irradiation region calculation unit;
- and
- a control unit that controls scanning so that the irradiation X-ray dose calculated by the X-ray dose calculation unit is applied to the X-ray irradiation region at each view angle calculated by the X-ray irradiation region calculation unit;
- wherein the X-ray irradiation region calculation unit calculates the X-ray irradiation region on the basis of an image reconstruction condition in the examination condition.
9 more elements
An X-ray CT apparatus comprising:
- an X-ray source that irradiates an object with X-rays;
- a collimator that restricts an irradiation range of the X-rays applied from the X-ray source;
- an X-ray detector that is disposed to oppose the X-ray source and detects X-rays having been transmitted through the object;
- a rotation board that is mounted with the X-ray source and the X-ray detector and is rotated around the object;
- a bed that carries the object into and out of an X-ray irradiation region;
- an image reconstruction device that reconstructs an image of the object on the basis of a transmitted X-ray dose detected by the X-ray detector;
- a display device that displays the image reconstructed by the image reconstruction device;
- an X-ray irradiation region calculation unit that calculates an X-ray irradiation region in a body axis direction at each view angle on the basis of an examination condition;
- an X-ray dose calculation unit that calculates an irradiation X-ray dose at each view angle according to an X-ray irradiation region calculated by the X-ray irradiation region calculation unit;
- a control unit that controls scanning so that the irradiation X-ray dose calculated by the X-ray dose calculation unit is applied to the X-ray irradiation region at each view angle calculated by the X-ray irradiation region calculation unit;
- an exposure dose calculation unit that calculates an exposure dose on the basis of an X-ray irradiation region calculated by the X-ray irradiation region calculation unit and an irradiation X-ray dose calculated by the X-ray dose calculation unit;
- and
- a user interface unit that displays, on the display device, one or more of a temporal change of the X-ray irradiation region, a slicing position change of the X-ray irradiation region, a temporal change of the irradiation X-ray dose, a slicing position change of the irradiation X-ray dose, a temporal change of the exposure dose, and a slicing position change of the exposure dose.
10 more elements
Dependencies are inferred from the claim text.