AUTOMATED APPARATUS TO IMPROVE IMAGE QUALITY IN X-RAY AND ASSOCIATED METHOD OF USE

• US 20170007196A1
• Filed: 11/26/2014
• Published: 01/12/2017
• Est. Priority Date: 11/27/2013
• Status: Active Grant

• Current Assignee: Children's Medical Center Corporation, Washington University In St Louis
• Original Assignee: Children's Medical Center Corporation, Washington University In St Louis
• Inventors: MacDougall, Robert, Clayton, William, Don, Steven
• Granted Patent: US 10,456,102 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: A61B 6/032 Transmission computed tomography [CT]
• CPC Class Codes: A61B 6/4417 related to combined acquisition of different diagnostic modalities
• CPC Class Codes: A61B 6/461 Displaying means of special interest
• CPC Class Codes: A61B 6/463 characterised by displaying multiple images or images and diagnostic data on one display
• CPC Class Codes: A61B 6/505 for diagnosis of bone
• CPC Class Codes: A61B 6/5264 due to motion
• CPC Class Codes: A61B 6/544 dependent on patient size
• CPC Class Codes: G01B 11/06 for measuring thickness ; e.g. of sheet material thickness measurement by thermal means G01B21/085
• CPC Class Codes: G01B 11/25 by projecting a pattern, e.g. one or more lines, moiré fringes on the object G01B11/255 takes precedence ; image analysis for depth or shape recovery G06T7/50
• CPC Class Codes: G01N 23/046 using tomography, e.g. computed tomography [CT]

Abstract

A system or method for improving quality in projection and tomographic x-ray, which includes a depth sensing device to measure a depth of at least one body part of a patient from the depth sensing device and a control unit to calculate a thickness and/or circumference of the body part using the depth information. The calculated thickness and circumference information is used to determine an optimal level of x-ray exposure for the body part. The system or method also includes a camera to identify the body part that needs to be examined and to detect any motion of the identified body part.

Claims

1. A system for improving quality in projection and tomographic x-ray imaging comprising:

an x-ray tube emitting x-rays;

a depth sensing device measuring a depth of at least one body part of a patient, wherein the depth represents a distance between said depth sensing device and the body part; and

a control unit comprising a memory, wherein said memory stores depth reference data that represents the distance between said depth sensing device and the body part, wherein said depth reference data is used to calculate one of a thickness of the body part and a circumference of the body part, wherein the calculated thickness or circumference is used to determine an optimal level of x-ray exposure for the body part.

2. The system for improving quality in projection and tomographic x-ray according to claim 1, wherein the circumference of the body part is used to determine an optimal level of x-ray exposure for the body part when using a CT scanner.

3. The system for improving quality in projection and tomographic x-ray according to claim 1, wherein the optimal level of x-ray exposure for the body part is used for determining a patient geometry when using a fluoroscopy, wherein the patient geometry is further used for determining at least one of a patient entrance exposure and a peak skin dose.

4. The system for improving quality in projection and tomographic x-ray imaging according to claim 1, further comprising a RGB camera identifying at least one body part of the patient, wherein said control unit is configured to display an overlay of the patient'"'"'s body wherein the patient'"'"'s body is displayed concurrently with a skeleton frame comprising a plurality of pre-defined joints of the body, wherein said control unit is configured to alert a user if the identified body part is not centered.

5. The system for improving quality in projection and tomographic x-ray imaging according to claim 4, wherein said RGB camera is configured to capture a plurality of frames of the patient'"'"'s body, wherein said control unit is configured to detect a motion of the patient by comparing at least one frame currently captured by said RGB camera with at least one frame previously captured by said RGB camera, wherein said control unit is configured to alert the user if any motion is detected.

6. The system for improving quality in projection and tomographic x-ray imaging according to claim 4, wherein said control unit is configured to display at least one of a targeted body part field and an image receptor field, wherein the image receptor field comprises an overlay of a plurality of Automatic Exposure Control (AEC) chambers.

7. The system for improving quality in projection and tomographic x-ray imaging according to claim 6, wherein said control unit is configured to verify the alignment of the targeted body part field according to the body part such that the body part remains within the collimated radiation field.

8. The system for improving quality in projection and tomographic x-ray imaging according to claim 4, wherein said control unit is configured to receive an order from a medical staff, wherein the order specifies which body part needs to be examined, wherein said RGB camera is configured to identify the specified body part.

9. The system for improving quality in projection and tomographic x-ray imaging according to claim 5, wherein the motion comprises at least one of the followings:

a plurality of phases of chest movement during respiration, abdominal movement during respiration, and a joint movement of any body part of the patient.

10. The system for improving quality in projection and tomographic x-ray imaging according to claim 1, wherein said control unit is configured to generate technique selection that enables a user to control said x-ray tube to emit an optimal amount of x-rays for the body part based on the thickness or circumference of the body part, wherein the technique selection comprises at least one of the following parameters used to control said x-ray tube:

kilovoltage, milliamperage, seconds, grid, focal spot, and filtration.

11. The system for improving quality in projection and tomographic x-ray imaging according to claim 10, wherein the technique selection is generated automatically by said control unit.

12. A method for improving quality in projection and tomographic x-ray imaging comprising:

measuring a depth of at least one body part of a patient with a depth sensing device, wherein the depth represents a distance between said depth sensing device and the body part;

storing depth reference data in a memory associated with a control unit, wherein the depth reference data represents the depth of the body part;

calculating one of a thickness of the body part and a circumference of the body part using the depth reference data; and

determining an optimal level of x-ray exposure of the body part using one of the thickness of the body part and the circumference of the body part.

13. The method for improving quality in projection and tomographic x-ray according to claim 12, wherein the circumference of the body part is used to determine the optimal level of x-ray exposure for the body part when using a CT scanner.

14. The method for improving quality in projection and tomographic x-ray according to claim 12, further comprising:

determining a patient geometry using the optimal level of x-ray exposure for the body part when using a fluoroscopy, wherein the patient geometry is further used for the determination of at least one of a patient entrance exposure and a peak skin dose.

15. The method for improving quality in projection and tomographic x-ray imaging according to claim 12, further comprising:

displaying an overlay of the patient'"'"'s body with said control unit, wherein the patient'"'"'s body is displayed concurrently with a skeleton frame comprising a plurality of pre-defined joints of the body; and

identifying at least one body part with an RGB camera, wherein a user is alerted if the identified body part is not appropriately centered.

16. The method for improving quality in projection and tomographic x-ray imaging according to claim 15, further comprising detecting, with said control unit, a motion of the patient by comparing at least one frame currently captured by said RGB camera with at least one frame previously captured by said RGB camera, wherein said RGB camera is configured to capture a plurality of frames of the patient'"'"'s body, wherein the user is alerted by said control unit if any motion is detected.

17. The method for improving quality in projection and tomographic x-ray imaging according to claim 12, wherein data representing the thickness or circumference of the body part is formatted in accordance with a Digital Imaging and Communications in Medicine (DICOM) standard, wherein the thickness or circumference data can be inserted into one of the header fields of a DICOM object and further comprising enabling, with said control unit, the user to perform a quality control of the amount of x-rays emitted based on at least the thickness or circumference data wherein said control unit is configured to display the thickness or circumference data.

18. A system for improving quality in projection and tomographic x-ray imaging comprising:

an x-ray tube;

an image receptor;

a depth sensing device, wherein said image receptor is positioned to be aligned with said depth sensing device;

a RGB camera; and

a display device, wherein said display device is configured to display a depth-image view, collimated view, and skeleton view, wherein the depth-image view comprises a plurality of pixels, each of which represents a distance between said depth sensing device and each point of said image receptor that corresponds to each pixel, wherein the distance is measured by said depth sensing device, the collimated view comprises a targeted body part field and an image receptor field, the skeleton view comprises an overlay of a patient'"'"'s body, wherein the patient is positioned between said x-ray tube and said image receptor, wherein the patient'"'"'s body is displayed concurrently with a skeleton frame comprising a plurality of pre-defined joints of the body, wherein said RGB camera captures a plurality of frames of the patient'"'"'s body.

19. The system for improving quality in projection and tomographic x-ray imaging according to claim 18, wherein said display device is configured to alert a user when the patient moves by utilizing at least one of the following methods of coloring, blinking, flagging, generating audible sound, and displaying numerical scale for motion and said display device is configured to alert the user when a wrong body part of the patient is positioned between said x-ray tube and said image receptor by utilizing at least one of the following methods consisting of coloring, blinking, flagging, and generating audible sound, wherein said display device is configured to alert the user when the body part is not centered by utilizing at least one of the following methods of coloring, blinking, flagging, and generating audible sound.

20. The system for improving quality in projection and tomographic x-ray imaging according to claim 18, wherein said display device is configured to adjust the alignment of the collimated radiation field according to the movement of the body part such that the body part remains motionless within the collimated radiation field.