Helical scanning type X-ray CT apparatus with movable gantry
First Claim
Patent Images
1. A CT apparatus for scanning an object, comprising:
- a CT gantry comprising an X-ray source configured to irradiate an X-ray while rotating about an object to be scanned and an X-ray detector configured to detect the X-ray penetrating through the object to be scanned;
a moving unit comprising a dolly, said CT gantry being mounted on said dolly, said moving unit further comprising a driving source configured to continuously move the dolly together with the CT gantry on a floor with respect to the object to be scanned; and
a detector configured to detect a moving distance of the CT gantry;
whereby helical scanning of the object to be scanned can be accomplished by moving the CT gantry in succession while rotating the X-ray source about the object to be scanned.
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Abstract
A helical-scanning type of X-ray CT apparatus includes a dolly 15 and a gantry body 7 mounted on the dolly 15. The dolly 15 is capable of translation relatively to a patient 5 lying on a tabletop 3. An X-ray tube 9 and an X-ray-detector 11 opposing the X-ray tube 9 are rotatably accommodated in the gantry body 7. In operation, the helical scanning operation of the X-ray CT apparatus is carried out by combining the translation of the dolly 15 with the rotation of the X-ray tube 9.
189 Citations
10 Claims
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1. A CT apparatus for scanning an object, comprising:
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a CT gantry comprising an X-ray source configured to irradiate an X-ray while rotating about an object to be scanned and an X-ray detector configured to detect the X-ray penetrating through the object to be scanned;
a moving unit comprising a dolly, said CT gantry being mounted on said dolly, said moving unit further comprising a driving source configured to continuously move the dolly together with the CT gantry on a floor with respect to the object to be scanned; and
a detector configured to detect a moving distance of the CT gantry;
whereby helical scanning of the object to be scanned can be accomplished by moving the CT gantry in succession while rotating the X-ray source about the object to be scanned. - View Dependent Claims (2, 3, 5, 10)
the dolly is capable of moving in a horizontal direction; - and
wherein a rotating plane of the X-ray source is generally vertical.
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3. The CT apparatus of claim 1, wherein the dolly comprises:
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a dolly body; and
a sliding table, the CT gantry being mounted on said sliding table, and said sliding table being capable of moving continuously with respect to the dolly body.
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5. The CT apparatus of claim 1, wherein the moving unit comprises:
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a single drive motor as the driving source; and
a changing unit configured to change a rotating speed of the single drive motor by changing any one of voltages, currents, frequency, pulse frequency all supplied for the single drive motor and motor windings to which power is applied.
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10. The CT apparatus of claim 2, wherein the moving unit further comprises a control unit configured to control the dolly in such a manner that once the positioning of the dolly prior to the helical scanning is completed, thereafter the dolly can be only traveled in one direction receding from the object to be scanned.
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4. A CT apparatus for scanning an object, comprising:
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a CT gantry comprising an X-ray source configured to irradiate an X-ray while rotating about an object to be scanned and an X-ray detector configured to detect the X-ray penetrating through the object to be scanned;
a moving unit configured to continuously move the CT gantry with respect to the object to be scanned; and
a detector configured to detect a moving distance of the CT gantry;
wherein the moving unit comprises;
a first driving unit configured to position the CT gantry in a rough-and-ready manner;
a second driving unit configured to move the CT gantry strictly for helical-scanning; and
a switching unit configured to switch operations of the first and second driving units so that either one of the first and second driving units operates solely;
whereby helical scanning of the object to be scanned can be accomplished by moving the CT gantry in succession while rotating the X-ray source about the object to be scanned.
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6. A CT apparatus for scanning an object, comprising:
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a CT gantry comprising an X-ray source configured to irradiate an X-ray while rotating about an object to be scanned and an X-ray detector configured to detect the X-ray penetrating through the object to be scanned, a rotating plane, of the X-ray source being generally vertical;
a moving unit configured to continuously move the CT gantry with respect to the object to be scanned, the moving unit having a dolly on which the CT gantry is mounted and being capable of moving in a horizontal direction, wherein the dolly is provided with at least one safety switch configured to detect that the dolly comes into contact with an external object which is not a constituent of the X-ray CT apparatus; and
a detector configured to detect a moving distance of the CT gantry;
whereby helical scanning of the object to be scanned can be accomplished by moving the CT gantry in succession while rotating the X-ray source about the object to be scanned.
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7. A CT apparatus for scanning an object, comprising:
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a CT gantry comprising an X-ray source configured to irradiate an X-ray while rotating about an object to be scanned and an X-ray detector configured to detect the X-ray penetrating through the object to be scanned, a rotating plane of the X-ray source being generally vertical;
a moving unit configured to continuously move the CT gantry with respect to the object to be scanned, the moving unit having a dolly on which the CT gantry is mounted and being capable of moving in a horizontal direction; and
a detector configured to detect a moving distance of the CT gantry;
wherein the CT gantry is provided, on a front side thereof close to the object to be scanned, with at least one safety switch configured to detect that the CT gantry comes into contact with an external object which is not a constituent of the X-ray CT apparatus;
whereby helical scanning of the object to be scanned can be accomplished by moving the CT gantry in succession while rotating the X-ray source about the object to be scanned.
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8. A CT apparatus for scanning an object, comprising:
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a CT gantry comprising an X-ray source configured to irradiate an X-ray while rotating about an object to be scanned and an X-ray detector configured to detect the X-ray penetrating through the object to be scanned, a rotating plane of the X-ray source being generally vertical;
a moving unit configured to continuously move the CT gantry with respect to the object to be scanned, the moving unit having a dolly on which the CT gantry is mounted and being capable for moving in a horizontal direction; and
a detector configured to detect a moving distance of the CT gantry;
wherein the CT gantry is provided, on an inner wall defining a radiographic port thereof, with a safety switch configured to detect that the CT gantry comes into contact with the object to be scanned; whereby helical scanning of the object to be scanned can be accomplished by moving the CT gantry in succession while rotating the X-ray source about the object to be scanned. - View Dependent Claims (9)
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Specification