Medical image diagnostic apparatus

Patent metadata

Field	Value
Publication number	US-9833210-B2
Application number	US-201514809586-A
Country	US
Kind code	B2
Filing date	Jul 27, 2015
Priority date	Jul 27, 2015
Publication date	Dec 5, 2017
Grant date	Dec 5, 2017

Abstract

According to one embodiment, a medical image diagnostic apparatus includes an X-ray tube, X-ray detector, image generation circuitry, display, and correction circuitry. The X-ray tube generates X-rays to an object. The X-ray detector detects the X-rays. The image generation circuitry generate an X-ray image based on the detected X-rays. The display displays an incident dose of the X-rays on the object, on an object image indicating the object. The correction circuitry correct a relative positional relationship between the object image and a display area of the incident dose on the object image based on the X-ray image.

First claim

The invention claimed is:

1. A medical image diagnostic apparatus, comprising:
an X-ray tube configured to irradiate an object with X-rays;
an X-ray detector configured to detect the X-rays;
processing circuitry configured to generate an X-ray image based on the detected X-rays; and
a display configured to display an incident dose region, which illustrates an incident dose distribution of the X-rays on the object, superimposed on an object image indicating the object,
wherein the processing circuitry is further configured to correct, based on the generated X-ray image, a relative positional relationship between the object image and the incident dose region that is superimposed on the object image.

2. The apparatus according to claim 1 , wherein the processing circuitry is further configured to correct at least one of a position and a size of the object image based on an anatomical landmark in the X-ray image.

3. The apparatus according to claim 1 , wherein the processing circuitry is further configured to
generate a different direction image corresponding to an imaging direction different from in imaging direction of the X-ray image, and
correct at least one of a size of the incident dose region and a size of the object image based on an anatomical landmark in the different direction image.

4. The apparatus according to claim 1 , wherein the processing circuitry is further configured to:
detect a positional shift between an irradiation range of the X-rays and the incident dose region, and
calculate the incident dose distribution based on an X-ray generation condition concerning generation of the X-rays, the irradiation range of the X-rays, the corrected positional relationship, and a position of the X-ray tube with respect to a patient table, in response to detection of the positional shift.

5. The apparatus according to claim 4 , further comprising input circuitry configured to input a predetermined time interval concerning recalculation of the incident dose distribution,
wherein the processing circuitry is further configured to recalculate the incident dose distribution during a period defined from a previous time that is prior to a detection time of the positional shift by the time interval, to the detection time.

6. The apparatus according to claim 1 , wherein the object image is a three-dimensional object model schematically indicating the object and having an anatomical landmark, and
the processing circuitry is further configured to correct at least one of a position and a size of the object image based on an anatomical landmark in the X-ray image and an anatomical landmark in the object model.

7. The apparatus according to claim 6 , wherein the processing circuitry is further configured to
detect a positional shift between an anatomical landmark of a predetermined organ in the X-ray image and an anatomical landmark of the predetermined organ in the object model, and
calculate the incident dose distribution based on the positional relationship corrected based on the positional shift, an irradiation range of the X-ray, an X-ray generation condition concerning generation of the X-rays, and a position of the X-ray tube with respect to a patient table, in response to detection of the positional shift.

8. The apparatus of claim 7 , wherein the processing circuitry is further configured to correct at least one of a position and a size of the object model by rotating the object model based on the positional shift.

9. The apparatus according to claim 1 , further comprising:
a memory storing a plurality of three-dimensional object models schematically indicating the object, wherein the processing circuitry is further configured to
specify, as the object image, an object model matching a size of the object, from the object models, based on the X-ray image and the object image; and
recalculate the incident dose distribution at a past time prior to a current time in an X-ray examination on the object based on the specified object model, an irradiation range of the X-ray, an X-ray generation condition concerning generation of the X-rays, the corrected positional relationship, and a position of the X-ray tube with respect to a patient table, in response to specifying of the object model.

10. The apparatus according to claim 9 , wherein the size of the object corresponds to an outer shape of the object.

11. The apparatus according to claim 1 , further comprising:
a memory storing a plurality of three-dimensional object models schematically indicating an object; and
input circuitry configured to input a change of the object model,
wherein the processing circuitry is further configured to recalculate the incident dose distribution at a past time prior to a current time in an X-ray examination on the object based on the changed object model, an irradiation range of the X-ray, an X-ray generation condition concerning generation of the X-rays, the corrected positional relationship, and a position of the X-ray tube with respect to a patient table, in response to a change of the object model.

12. The apparatus according to claim 1 , further comprising:
a memory storing a plurality of three-dimensional object models schematically indicating the object and past volume data corresponding to each of a plurality of patients;
input circuitry configured to input a change instruction for past volume data concerning the object in the past volume data, wherein the processing circuitry is further configured to
specify, as the object image, an object model matching an outer shape of the object, from the object models, based on volume data corresponding to the change instruction and the object image, and
recalculate the incident dose distribution of a past time prior to a current time in an X-ray examination on the object based on the specified object model, an irradiation range of the X-ray, an X-ray generation condition concerning generation of the X-rays, the corrected positional relationship, and a position of the X-ray tube with respect to a patient table.

13. The apparatus according to claim 1 , wherein the processing circuitry is further configured to generate volume data based on a plurality of X-ray images acquired by rotating the X-ray tube and the X-ray detector around the object while making the X-ray tube and the X-ray detector face each other, and
the apparatus further comprises
a memory storing a plurality of three-dimensional object models schematically indicating the object as the object image, wherein the processing circuitry is further configured to

specify, as the object image, an object model matching an outer shape of the object from the object models, based on the volume data and the object image, and
recalculate the incident dose distribution at a past time prior to a current time in an X-ray examination on the object based on the specified object model, an irradiation range of the X-ray, an X-ray generation condition concerning generation of X-rays, the corrected positional relationship, and a position of the X-ray tube with respect to the patient table, in response to specifying of the object model.

14. The apparatus according to claim 1 , wherein the processing circuitry is further configured to generate, as the object image, a three-dimensional measurement image having measurement data concerning the object, based on volume data of the object,
the display is configured to display the measurement image in place of the object image, in response to generation of the measurement image, and
the processing circuitry is further configured to correct a relative positional relationship between the measurement

Assignees

• Toshiba Medical Sys Corp
• Univ New York State Res Found

Inventors

• Sakaguchi Takuya
• Watanabe Yuichiro
• Takemoto Hisato
• Bednarek Daniel
• Rana Vijay

Classifications

• A61B6/4441

  the rigid structure being a C-arm or U-arm · CPC title

• A61B6/463 Primary

  characterised by displaying multiple images or images and diagnostic data on one display · CPC title

• A61B6/544

  dependent on patient size · CPC title

• A61B6/5264

  due to motion · CPC title