X-ray CT apparatus
AssigneesKabushiki Kaisha Toshiba, Toshiba Medical Systems Corporation
InventorsShinsuke Tsukagoshi, Tatsuro Suzuki
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Abstract
An X-ray CT apparatus includes an X-ray tube, an X-ray detector, and a control unit. The X-ray detector includes at least two divided ranges. One range includes a small detection range in which X-ray detection elements of a small size for detecting the X-rays radiated from the X-ray tube are arrayed. The other range includes a large detection range in which the X-ray detection elements of a large size for detecting the X-rays radiated from the X-ray tube are arrayed. The control unit is configured to select the small detection range or the large detection range. The X-ray CT apparatus can efficiently achieve high resolution upon imaging and, further, is capable of fully utilizing X-ray detection elements of a small detector size.
Claims17
An X-ray CT apparatus configured to rotate an X-ray tube and an X-ray detector around a subject mounted on a table top, radiate X-rays with a cone angle enlarging from the X-ray tube to the subject, and acquire images of the subject based on the X-rays transmitted through the subject and detected by the X-ray detector, the X-ray CT apparatus comprising:
- the X-ray tube, which includes a radiation surface of the X-rays and is configured such that a size of an effective focal point, which is a point when the radiation surface is viewed from a side on which the X-rays are radiated, is small at one end of the cone angle and is increased toward another end of the cone angle;
- the X-ray detector, which is configured to include at least two divided ranges,
- one range is configured to include a small detection range in which X-ray detection elements of a small size for detecting the X-rays radiated from the X-ray tube are arrayed,
- the other range is configured to include a large detection range in which X-ray detection elements of a large size for detecting the X-rays radiated from the X-ray tube are arrayed, and
- the radiation surface and the X-ray detector are configured such that positions thereof are transferable;
- and
- a control unit configured to select the small detection range or the large detection range, and transfer the positions according to the detection range selected and a position of the detection range to detect X-rays from the effective focal point in a size corresponding to the size of the X-ray detection elements of the X-ray detector.
An X-ray CT apparatus configured to rotate an X-ray tube and an X-ray detector around a subject mounted on a table top, radiate X-rays with a cone angle enlarging from the X-ray tube to the subject, and acquire images of the subject based on the X-rays transmitted through the subject and detected by the X-ray detector, the X-ray CT apparatus comprising:
- the X-ray tube, which is configured to include a radiation surface of the X-rays and be structured such that the size of an effective focal point that is a point when seeing the radiation surface from the side on which the X-rays are radiated is decreased at one end of the cone angle, while the size of the effective focal point is increased toward the other end of the cone angle;
- the X-ray detector, which is configured to include at least two divided ranges,
- one range is configured to include a small detection range in which X-ray detection elements of a small size for detecting the X-rays radiated from the X-ray tube are arrayed,
- the other range is configured to include a large detection range in which the X-ray detection elements of a large size for detecting the X-rays radiated from the X-ray tube are arrayed, and
- the radiation surface and the X-ray detector are configured such that positions thereof are transferable;
- and
- a control unit configured to select the small detection range or the large detection range, and transfer the positions according to the detection range selected and a position of the detection range to detect X-rays from the effective focal point in a size corresponding to the size of the X-ray detection elements of the X-ray detector.
Dependencies are inferred from the claim text.