X-ray CT scanning apparatus and scanning method thereof

Patent metadata

Field	Value
Publication number	US-10709405-B2
Application number	US-201615771390-A
Country	US
Kind code	B2
Filing date	Oct 26, 2016
Priority date	Oct 26, 2015
Publication date	Jul 14, 2020
Grant date	Jul 14, 2020

Abstract

Disclosed is an X-ray CT radiographing apparatus capable of selecting various FOVs, simplifying radiographing motion, and reducing X-ray exposure dose, and a method thereof. An X-ray CT radiographing apparatus according to the present invention includes a rotation supporter rotating by a rotation driver, a generating unit including an X-ray generator emitting X-rays and a collimator so as to radiate a collimated X-ray beam, a sensing unit including a small width X-ray sensor moving in a tangential direction of a rotation trajectory, and a controller controlling operations of the rotation driver, the generating unit, and the sensing unit when performing X-ray radiographing, and configuring movement trajectories of an X-ray beam for radiographing FOVs different from each other to be the same, and controlling the generating unit to turn OFF the X-ray beam in sections different from each other of the movement trajectory of the X-ray beam according to the FOV.

First claim

The invention claimed is:

1. An X-ray computer tomography (CT) radiographing apparatus, the apparatus comprising:
a rotation supporter rotating by a rotation driver;
a generating unit disposed in a first side of the rotation supporter, and including an X-ray generator emitting X-rays and a collimator to radiate a collimated X-ray beam;
a sensing unit disposed in a second side of the rotation supporter to face the generating unit with a field of view (FOV in between, and including a X ray sensor and a motor for moving the X-ray sensor in a tangential direction of a rotation trajectory when the rotation supporter rotates; and
a controller blocking the X-rays or stopping emission of the X-rays radiated toward the FOV in predetermined sections of the rotation trajectory while the rotation supporter is rotating for performing X-ray radiographing,
wherein a width w 2 of the X-ray sensor is narrower than (m×(w 1 / 2 )), where m is a magnification ratio and w 1 is a maximum width of FOV.

2. The apparatus of claim 1 , wherein the controller stops the emission of the X-rays from the X-ray generator for the predetermined sections.

3. The apparatus of claim 1 , wherein the controller physically blocks the X-rays emitted from the X-ray generator in the predetermined sections of the rotation trajectory by using the collimator.

4. The apparatus of claim 1 , wherein the generating unit further includes a shutter physically blocking the X-ray beam emitted from the X-ray generator in the predetermined sections of the rotation trajectory.

5. The apparatus of claim 1 , further comprising an image reconstructing unit providing a three-dimensional X-ray image for at least one part within the FOV by reconstructing a result detected by the X-ray sensor.

6. An X-ray computer tomography (CT) radiographing method, the method comprising:
receiving an input of a position and a shape of a field of view (FOV); and
performing X-ray radiographing for the FOV by rotating a generating unit including an X-ray generator and, in association thereof, simultaneously rotating a sensing unit including a motor and an X-ray sensor with the FOV in between, the motor moving the X-ray sensor in a tangential direction of the rotation trajectory, and blocking X-rays or stopping emission of the X-rays emitted from the X-ray generator toward the FOV in predetermined sections of the rotation trajectory according to the position and the shape of the FOV while rotating the generating unit and the sensing unit for performing X-ray radiographing,
wherein a width w 2 of the X-ray sensor is narrower than (m×(w 1 / 2 )), where m is a magnification ratio and w 1 is a maximum width of FOV.

7. The method of claim 6 , wherein in the X-ray radiographing, the emission of the X-rays is stopped by controlling the X-ray generator to be turned ON/OFF or the X-rays is blocked by physically blocking an X-ray beam radiated toward the FOV.

8. The method of claim 6 , further comprising, after the X-ray radiographing, providing a three-dimensional X-ray image for at least one part within the FOV by reconstructing a result detected by the X-ray sensor.

Assignees

• Vatech Co Ltd
• Vatech Ewoo Holdings Co Ltd

Inventors

• Ahn Byung-Jun

Classifications

• G06T12/00

  Tomographic reconstruction from projections · CPC title

• A61B6/4435

  the source unit and the detector unit being coupled by a rigid structure · CPC title

• A61B6/4452

  the source unit and the detector unit being able to move relative to each other · CPC title

• A61B6/405

  Source units specially adapted to modify characteristics of the beam during the data acquisition process (A61B6/4021, A61B6/4035 take precedence) · CPC title

• A61B6/542 Primary

  involving control of exposure · CPC title