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X-ray computed tomography apparatus and reconstruction processing method

A technology of tomography and X-rays, which is applied to measuring devices, computerized tomography scanners, and instruments for radiological diagnosis, etc., and can solve problems such as image quality degradation

Active Publication Date: 2016-05-25
TOSHIBA MEDICAL SYST CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, in the reconstruction of the mask area, there is a problem of image quality degradation depending on the part.

Method used

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  • X-ray computed tomography apparatus and reconstruction processing method
  • X-ray computed tomography apparatus and reconstruction processing method
  • X-ray computed tomography apparatus and reconstruction processing method

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Experimental program
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no. 1 Embodiment approach ）

[0032] figure 1 It is a diagram showing the configuration of the X-ray computed tomography apparatus 1 in the first embodiment. The X-ray computed tomography apparatus 1 of the first embodiment includes: a gantry 100, a high voltage generating unit 101, a preprocessing unit 125, a width determining unit 127, an interpolation data generating unit 129, a reconstruction unit 131, an interface 133, and a display unit 139 , an input unit 141 , and a control unit 143 .

[0033] The high voltage generator 101 generates a high voltage to be applied to the X-ray tube 103 . The high voltage generating unit 101 generates a plurality of high voltages under the control of a control unit 143 described later.

[0034] The gantry 100 accommodates a rotation support mechanism. The rotation support mechanism is composed of the rotation ring 105 and a stage drive unit 107 (motor) that drives the rotation of the ring support mechanism and the ring that rotatably support the rotation ring 105 ...

no. 2 Embodiment approach ）

[0083] The difference from the first embodiment is that the width of the end portion used for reconstruction is determined based on at least one of the diameter, the radiation range setting amount (at least one of the cone angle, the number of columns, and the detector width), and the imaging target site The ratio of the maximum width of the end portion (hereinafter referred to as the end portion expansion rate) determines the end portion used for reconstruction based on the determined end portion expansion rate.

[0084] Figure 11It is a configuration diagram showing the configuration of the X-ray computed tomography apparatus 1 of the second embodiment. The X-ray computed tomography apparatus 1 of the second embodiment includes: a gantry 100 , a high voltage generating unit 101 , a preprocessing unit 125 , an interpolation data generating unit 129 , a reconstruction unit 131 , a display unit 139 , a control unit 143 , and an interface 133 , the input unit 141 , the ratio d...

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Abstract

The X-ray computed tomography apparatus (1) of this embodiment includes: an X-ray generator (102) that generates cone beam X-rays, and a device that detects X-rays generated from the X-ray generator (102) and transmitted through a subject The X-ray detection unit (109), the reconstruction unit (131) that reconstructs the volume data related to the reconstruction region of the diameter specified by the operator from the projection data corresponding to the output of the X-ray detection unit (109), and for accumulating an interpolation data generation unit (129) for generating interpolation data from actual measurement data with respect to projection data related to end portions located on both sides of a central portion of a reconstruction region in which projection data required for reconstruction of volume data is accumulated by actual measurement data, A width determining unit ( 127 ) that determines a width of an end portion based on a radiation range setting amount related to setting an X-ray radiation range along the long axis direction of the couch, and a diameter of an imaging target site of the subject.

Description

technical field [0001] Embodiments of the present invention relate to an X-ray computed tomography apparatus and a reconstruction processing method. Background technique [0002] In an X-ray computed tomography apparatus (Computed Tomography: hereinafter referred to as CT) having an area detector (Area Detector), volume data is reconstructed from projection data obtained by scanning a circular orbit of a subject. The projection data is equivalent to the data obtained by performing the line integration of the X-ray attenuation coefficient along the X-ray line. At this time, the region where the projected data has the angle range (for example, 360°) required for the reconstruction process based on the actual measurement data (hereinafter referred to as the area where the actual measurement data is complete) is, for example, combining the lower base of an isosceles trapezoid with the rotation axis, and rotating The inner area of ​​the resulting rotating body (the inner area of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B6/03
CPCA61B6/03A61B6/5205G01N23/046G06T11/003
Inventor 中西知秋野成臣植林義统后藤崇博
Owner TOSHIBA MEDICAL SYST CORP
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