JP2012075782A5

JP2012075782A5 -

Info

Publication number: JP2012075782A5
Application number: JP2010225730A
Authority: JP
Filing date: 2010-10-05
Publication date: 2013-11-07
Anticipated expiration: 2030-10-05

Claims

  An X-ray source that emits X-rays;
  An X-ray detector disposed opposite to the X-ray source for detecting X-rays transmitted through the subject;
  A variable aperture X-ray diaphragm to limit the X-ray field irradiated from the X-ray source to the subject;
  A switch unit that can be selectively operated from one of the first and second states to the other;
  Controlling X-ray irradiation from the X-ray source and the X-ray diaphragm so as to irradiate the subject with the X-rays in a first irradiation field during a period in which the first state is maintained; The high voltage generator and the X-ray diaphragm are controlled to irradiate the subject with the X-ray in a second irradiation field that is narrower than the first irradiation field during a period in which the second state is maintained. An imaging control unit to
  After switching from the first state to the second state, a live display is performed in the second irradiation field together with the still image of the last frame in the first irradiation field obtained in the first state. And
An X-ray imaging apparatus comprising:

An X-ray source that emits X-rays;
An X-ray detector disposed opposite to the X-ray source for detecting X-rays transmitted through the subject;
A variable aperture X-ray diaphragm to limit the X-ray field irradiated from the X-ray source to the subject;
A switch unit that can be selectively operated from one of the first and second states to the other;
Controlling X-ray irradiation from the X-ray source and the X-ray diaphragm so as to irradiate the subject with the X-rays in a first irradiation field during a period in which the first state is maintained; The high voltage generator and the X-ray diaphragm are controlled to irradiate the subject with the X-ray in a second irradiation field that is narrower than the first irradiation field during a period in which the second state is maintained. An X-ray imaging apparatus comprising:

The X-ray imaging apparatus according to claim 2 , further comprising an image processing unit that synthesizes a second image corresponding to the second irradiation field with a first image corresponding to the first irradiation field.

The image processing unit combines the first image corresponding to the first irradiation field as a moving image or a still image with the second image corresponding to the second irradiation field in a period in which the second state is maintained. The X-ray imaging apparatus according to claim 3 .

The image processing unit sets one image processing condition of the first image and the second image to the other image processing so that the luminance level of the first image and the luminance level of the second image are substantially equalized. The X-ray imaging apparatus according to claim 3 , wherein the X-ray imaging apparatus is different from the conditions.

Claim 2 wherein said first state is with respect to the irradiation dose of the X-ray the period in which it is sustained, characterized in that the irradiation dose of the X-ray of the period in which the second state is sustained often The X-ray imaging apparatus described.

The tube voltage applied to the X-ray source during the period in which the second state is maintained is higher than the tube voltage applied to the X-ray source during the period in which the first state is maintained. The X-ray imaging apparatus according to claim 2 .

3. The X-ray according to claim 2 , wherein the first irradiation field corresponds to a substantially full opening of the X-ray diaphragm, and the second irradiation field corresponds to a partial opening of the X-ray diaphragm. Line imaging device.

The imaging control unit opens an opening of the X-ray diaphragm so that the second irradiation field is set to a predetermined position and size when the X-ray source is positioned at a predetermined imaging angle with respect to the subject. The X-ray imaging apparatus according to claim 2 , wherein the X-ray imaging apparatus is controlled.

The second radiation field, X-rays imaging apparatus according to claim 2, wherein a set according to the region of interest that is specified on the first image.

The imaging control unit controls the opening of the X-ray diaphragm so as to move the position of the second irradiation field in accordance with the position of the image of the region of interest in the second image. 10. The X-ray imaging apparatus according to 10 .

When the displacement of the image of the region of interest in the second image exceeds a predetermined distance, the imaging control unit displays a message for prompting the user to switch from the second state to the first state. The X-ray imaging apparatus according to claim 10, wherein a control signal for outputting the combination is output.

The imaging control unit controls the X-ray stop to change the opening of the X-ray stop to an opening corresponding to the first irradiation field when the second state is released. The X-ray imaging apparatus according to claim 2 .

An X-ray source that emits X-rays;
An X-ray detector disposed opposite to the X-ray source for detecting X-rays transmitted through the subject;
A variable aperture X-ray diaphragm to limit the X-ray field irradiated from the X-ray source to the subject;
A first switch that is turned on / off by an operator;
A second switch that is turned on / off by the operator;
The X-ray irradiation from the X-ray source and the X-ray diaphragm are controlled so as to irradiate the subject with the X-ray in the first irradiation field during a period in which the ON state of the first switch is maintained. Then, the X-ray from the X-ray source is irradiated so that the subject is irradiated with the X-ray in a second irradiation field narrower than the first irradiation field during a period in which the second switch is on. An X-ray imaging apparatus comprising: an imaging control unit that controls X-ray irradiation and the X-ray diaphragm.

An X-ray source that emits X-rays;
An X-ray detector disposed opposite to the X-ray source for detecting X-rays transmitted through the subject;
A variable aperture X-ray diaphragm to limit the X-ray field irradiated from the X-ray source to the subject;
A switch that is turned on and off by an operator;
X-ray irradiation from the X-ray source and the X so that the generation of the X-ray is started and the change of the aperture of the X-ray diaphragm is started when the switch is switched from the OFF state to the ON state. An X-ray imaging apparatus comprising: an imaging control unit that controls a line diaphragm.

A first X-ray source that emits X-rays;
A first X-ray detector disposed opposite to the first X-ray source for detecting X-rays transmitted through the subject;
A first X-ray diaphragm having a variable aperture for limiting an X-ray field irradiated from the first X-ray source to the subject;
A second X-ray source that emits X-rays;
A second X-ray detector disposed opposite to the second X-ray source for detecting X-rays transmitted through the subject;
A second X-ray diaphragm having a variable aperture for limiting the X-ray field irradiated from the second X-ray source to the subject;
A first switch that is turned on / off by an operator;
A second switch that is turned on / off by the operator;
X-ray irradiation from the first and second X-ray sources and the first so as to irradiate the subject with the X-ray in the first irradiation field during a period in which the first switch is kept on. And controlling the second X-ray aperture so that the subject is irradiated with the X-rays in a second irradiation field narrower than the first irradiation field during a period in which the second switch is kept on. An X-ray imaging apparatus comprising: an imaging control unit that controls X-ray irradiation from the first and second X-ray sources and the first and second X-ray apertures.