Multisource type X-ray CT apparatus
First Claim
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1. A multisource type X-ray CT apparatus comprising:
- a sensor array including a plurality of detection devices densely fixed on a circumference which surrounds a subject in order to detect X-rays transmitted through the subject;
a vacuum chamber fixed so as to surround the sensor array coaxially with arrangement of the sensor array; and
an X-ray generation unit which is disposed in the vacuum chamber and which emits the X-rays toward the subject surrounded by said sensor array, wherein said X-ray generation unit includes;
a cathode which is disposed in one circuit in said vacuum chamber so as to surround the sensor array coaxially with the arrangement of said sensor array and which has a tip portion that emits electron beams by power supply;
an anode disposed in a position upon which the electron beams emitted from said cathode are incident, and disposed in said vacuum chamber so as to surround the sensor array coaxially with the arrangement of said sensor array, so that the electron beams are received and the X-rays are emitted;
a gate array including a plurality of grid electrodes which are densely arranged between said cathode and anode and which is insulated from at least the cathode, the grid electrodes being insulated from one another and arranged at equal pitches in one circle;
a beam passing hole which is open in a middle of each of the grid electrodes in a longitudinal direction so as to face the tip portion of the cathode and which allows passage of the electrode beams emitted from the cathode;
a countersink formed around the beam passing hole in each of the grid electrodes;
a power source which applies a bias voltage to the grid electrodes of said gate array; and
control means for controlling a power supply operation from said power source so as to select the grid electrode suitable for image pickup from said gate array in accordance with an image pickup portion of the subject and to release the bias voltage applied to the selected grid electrode.
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Abstract
A multisource type X-ray CT apparatus including a fixed sensor array, a fixed vacuum chamber, and an X-ray generation unit. The X-ray generation unit includes a cathode and an anode which are fixed in the vacuum chamber so as to surround the sensor array, a gate array including a plurality of grid electrodes which are densely fixed between the cathode and anode and which include holes for passing the electron beams, a power source which applies a bias voltage to the grid electrodes of the gate array, and a controller which controls the power supply operation from the power source so as to select the grid electrode suitable for image pickup from the gate array in accordance with an image pickup portion of the subject and to release the bias voltage applied to the selected grid electrode.
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Citations
7 Claims
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1. A multisource type X-ray CT apparatus comprising:
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a sensor array including a plurality of detection devices densely fixed on a circumference which surrounds a subject in order to detect X-rays transmitted through the subject;
a vacuum chamber fixed so as to surround the sensor array coaxially with arrangement of the sensor array; and
an X-ray generation unit which is disposed in the vacuum chamber and which emits the X-rays toward the subject surrounded by said sensor array, wherein said X-ray generation unit includes;
a cathode which is disposed in one circuit in said vacuum chamber so as to surround the sensor array coaxially with the arrangement of said sensor array and which has a tip portion that emits electron beams by power supply;
an anode disposed in a position upon which the electron beams emitted from said cathode are incident, and disposed in said vacuum chamber so as to surround the sensor array coaxially with the arrangement of said sensor array, so that the electron beams are received and the X-rays are emitted;
a gate array including a plurality of grid electrodes which are densely arranged between said cathode and anode and which is insulated from at least the cathode, the grid electrodes being insulated from one another and arranged at equal pitches in one circle;
a beam passing hole which is open in a middle of each of the grid electrodes in a longitudinal direction so as to face the tip portion of the cathode and which allows passage of the electrode beams emitted from the cathode;
a countersink formed around the beam passing hole in each of the grid electrodes;
a power source which applies a bias voltage to the grid electrodes of said gate array; and
control means for controlling a power supply operation from said power source so as to select the grid electrode suitable for image pickup from said gate array in accordance with an image pickup portion of the subject and to release the bias voltage applied to the selected grid electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification
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Current AssigneeMitsubishi Heavy Industries, Ltd.
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Original AssigneeMitsubishi Heavy Industries, Ltd.
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InventorsUrano, Susumu, Ogura, Shin, Mihara, Kazumasa, Hori, Keiichi
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Primary Examiner(s)Glick, Edward J.
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Assistant Examiner(s)Ho, Allen C.
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Application NumberUS10/302,835Publication NumberTime in Patent Office694 DaysField of Search378/10, 378/122, 378/124, 378/134, 378/136, 378/137, 378/138, 378/143, 378/146US Class Current378/10CPC Class CodesA61B 6/032 Transmission computed tomog...A61B 6/4028 resulting in acquisition of...A61B 6/4488 Means for cooling A61B6/045...H01J 2235/16 VesselsH01J 35/025 X-ray tubes with structural...H01J 35/04 Electrodes ; Mutual positio...H01J 35/112 Non-rotating anodes H01J35/...
