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WO2009018201A1 - Système numérique d'étalonnage de rayons x - Google Patents

Système numérique d'étalonnage de rayons x Download PDF

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Publication number
WO2009018201A1
WO2009018201A1 PCT/US2008/071316 US2008071316W WO2009018201A1 WO 2009018201 A1 WO2009018201 A1 WO 2009018201A1 US 2008071316 W US2008071316 W US 2008071316W WO 2009018201 A1 WO2009018201 A1 WO 2009018201A1
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WO
WIPO (PCT)
Prior art keywords
length
electronic sensor
measurement tool
calibration system
measured
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2008/071316
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English (en)
Inventor
Louie Khouri
Joseph J. Bryan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of WO2009018201A1 publication Critical patent/WO2009018201A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/58—Testing, adjusting or calibrating thereof
    • A61B6/582—Calibration
    • A61B6/583—Calibration using calibration phantoms
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/50—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment specially adapted for specific body parts; specially adapted for specific clinical applications
    • A61B6/51—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment specially adapted for specific body parts; specially adapted for specific clinical applications for dentistry

Definitions

  • the present disclosure relates to digital radiography and more particularly to a calibration system for digital radiography software.
  • Digital radiography is a form of x-ray imaging where electronic sensors are used instead of photographic film.
  • the benefits of digital radiography include the ability to digitally transfer and enhance captured images and the ability to make electronic sensors thinner and more comfortable for dental radiography than photographic film.
  • Feedback from digital radiography is instantaneous as opposed to film based x-rays, which require time and expense for processing the film.
  • the amount of radiation required for digital radiography versus film based x-rays is reduced by up to about 90%.
  • traditional digital radiography systems do not capture images as accurately as desired.
  • FIG. 1 A a perspective view of an exemplary dental radiography system 100 that produces elongated digital radiographic images is shown.
  • the dental radiography system 100 includes an electronic sensor 102, a video connector 104 that connects the electronic sensor 102 to dental radiography software (not shown), and an x-ray source 106.
  • the electronic sensor 102 is placed near a tooth 108 of a length 1 10.
  • the x-ray source 106 projects an x-ray beam 1 12 onto the electronic sensor 102 and the tooth 108
  • the electronic sensor 102 captures a pattern of radiation that the tooth 108 reflects and outputs the pattern to the dental radiography software.
  • the software produces a digital radiographic image of the tooth 108 based on the pattern. However, since an angle 1 14 between the electronic sensor 102 and the x-ray beam 1 12 is greater than 90 degrees (e.g., due to operator error), the image is elongated. In other words, when a dental technician and/or the software measure the length of the tooth 108 within the image, the measured length will be greater than the actual length 1 10.
  • FIG. 1 B a perspective view of the exemplary dental radiography system 100 that produces foreshortened digital radiographic images is shown. Since an angle 1 16 between the electronic sensor 102 and the x-ray beam 1 12 is less than 90 degrees, the produced images are foreshortened. In other words, when the length of the tooth 108 is measured within one of the images, the measured length will be less than the length 1 10.
  • a calibration system of a digital radiography system comprises a measurement tool and a digital radiography module.
  • the measurement tool of a predetermined length is disposed on an electronic sensor.
  • the digital radiography module produces a digital radiographic image based on a signal from the electronic sensor, measures a measured length of the measurement tool within the image, and calibrates itself based on the predetermined and the measured lengths.
  • a method of operating a calibration system of a digital radiography system comprises producing a digital radiographic image based on a signal from an electronic sensor; measuring a measured length of a measurement tool of the electronic sensor within the image; and calibrating a digital radiography module based on a predetermined length of the measurement tool and the measured length.
  • FIG. 1 A is a side view of an exemplary dental radiography system that produces elongated digital radiographic images according to the principles of the prior art
  • FIG. 1 B is a perspective view of the dental radiography system that produces foreshortened digital radiographic images according to the principles of the prior art
  • FIG. 2 is a perspective view of an exemplary dental radiography system that includes a calibration system for dental radiography software according to the principles of the present disclosure
  • FIG. 3A is a perspective view of an exemplary electronic sensor according to the principles of the present disclosure.
  • FIG. 3B is a perspective view of another exemplary implementation of the electronic sensor according to the principles of the present disclosure.
  • FIG. 3C is a perspective view of another exemplary implementation of the electronic sensor according to the principles of the present disclosure.
  • FIG. 4A is a perspective view of another exemplary implementation of the electronic sensor and an exemplary cover according to the principles of the present disclosure
  • FIG. 4B is a perspective view of another exemplary implementation of the electronic sensor and another exemplary implementation of the cover according to the principles of the present disclosure
  • FIG. 4C is a perspective view of another exemplary implementation of the electronic sensor and another exemplary implementation of the cover according to the principles of the present disclosure
  • FIG. 5A is a screenshot illustrating the dental radiography software displaying a digital radiographic image that is produced by the dental radiography system according to the principles of the present disclosure.
  • FIG. 5B is a screenshot illustrating the dental radiography software being used to measure a length within the digital radiographic image according to the principles of the present disclosure.
  • module refers to an Application Specific Integrated Circuit (ASIC), an electronic circuit, a processor (shared, dedicated, or group) and memory that execute one or more software or firmware programs, a combinational logic circuit, and/or other suitable components that provide the described functionality.
  • ASIC Application Specific Integrated Circuit
  • processor shared, dedicated, or group
  • memory that execute one or more software or firmware programs, a combinational logic circuit, and/or other suitable components that provide the described functionality.
  • the digital radiography system of the present disclosure includes a calibration system for digital radiography software.
  • the calibration system includes a marker (i.e., measurement tool) of known length that is embedded within or disposed on an electronic sensor.
  • the calibration system further includes a read function for the software that measures a length of the marker within captured images and calibrates the software based on the measured length and the known length.
  • a dental radiography system e.g., for general dentistry, periodontics, endodontics, and oral surgery
  • the principles of the present disclosure are also applicable to any radiography system.
  • radiography systems may include, but are not limited to, medical radiography systems, radiography systems for the automotive industry, and/or radiography systems for airport security.
  • the dental radiography system 200 includes an electronic sensor 202 that includes a marker 204 of known length, a video connector 206 that connects the electronic sensor to the dental radiography software (not shown), and an x-ray source 208.
  • the electronic sensor 202 may include, but is not limited to, a charge-coupled device (CCD) image sensor and/or a complementary metal-oxide-semiconductor (CMOS) image sensor.
  • CCD charge-coupled device
  • CMOS complementary metal-oxide-semiconductor
  • the marker 204 is integrated with the sensor whereby it is either embedded within or disposed on the electronic sensor 202 in various embodiments.
  • the marker 204 may be disposed along the right edge of the electronic sensor 202.
  • the marker 204 may include length markings.
  • the video connector 206 may include, but is not limited to, an RCA connector, an Universal Serial Bus (USB) connector, and/or a High-Definition Multimedia Interface (HDMI) connector.
  • the electronic sensor 202 is placed near a tooth 210 of a length 212.
  • the x-ray source 208 projects an x-ray beam 214 onto the electronic sensor 202 and the tooth 210
  • the electronic sensor 202 captures a pattern of radiation that the tooth 210 reflects and outputs the pattern to the dental radiography software.
  • the software produces a digital radiographic image of the tooth 210 based on the pattern. The image is elongated or foreshortened if the angle between the electronic sensor 202 and the x-ray beam 214 is not 90 degrees.
  • the dental radiography software includes a read function that measures a length of the marker 204 within the image.
  • the read function calibrates the software based on the measured length and the known length of the marker 204.
  • the read function may determine a proportional correction factor based on the known length divided by the measured length.
  • the software may multiply the other measured lengths by the proportional correction factor to correct the other measured lengths (i.e., provide accurate measurements).
  • the dental radiography system 200 may provide accurate measurements for all dental procedures.
  • the dental procedures may include, but are not limited to, implant placements (e.g., measuring an implant's proximity to an inferior alveolar nerve and/or a sinus), root canal preparation and completion, periodontal evaluations (e.g., measuring periodontal pocket depth), measuring bone defects, and measuring depth of a filling and/or a cavity with respect to a nerve.
  • implant placements e.g., measuring an implant's proximity to an inferior alveolar nerve and/or a sinus
  • periodontal evaluations e.g., measuring periodontal pocket depth
  • measuring bone defects e.g., measuring depth of a filling and/or a cavity with respect to a nerve.
  • the dental procedures are not limited to those involving endodontically-treated teeth.
  • the electronic sensor 202 may include a marker 302 that is disposed along the left edge of the electronic sensor 202 as shown in FIG. 3A instead of the right edge as shown in FIG. 2.
  • the electronic sensor 202 may include a marker 304 that is disposed along the top edge of the electronic sensor 202 as shown in FIG. 3B or along the bottom edge (not shown).
  • the electronic sensor 202 may include both of the markers 302 and 304 as shown in FIG. 3C. Accordingly, the electronic sensor 202 may include at least one marker that may be disposed along at least one edge of the electronic sensor 202, so the electronic sensor 202 may be used in various positions.
  • FIGs. 4A-4C perspective views of another exemplary implementation of the electronic sensor 202 and exemplary implementations of a cover 402 are shown.
  • the electronic sensor 202 may not include any markers.
  • the cover 402 may include at least one integrated marker 404 typically occurring along an edge thereof.
  • the cover 402 may include a marker 406 along the left edge as shown in FIG. 4A or right edge (not shown), the top edge of the cover 402 as shown in FIG. 4B or along the bottom edge (not shown).
  • the cover 402 may include both of the markers 404 and 406 as shown in FIG. 4C. Accordingly, the cover 402 may include at least one marker that may be disposed along at least one edge of the cover 402.
  • the cover 402 is retrofit to the electronic sensor 202, so the electronic sensor 202 may be used in various positions to calibrate the dental radiography software.
  • the above described covers will be formed from a material that does not interfere with the x-ray function and may be formed from an autoclavable material or optionally may be disposable.
  • FIG. 5A a screenshot illustrating the dental radiography software displaying a digital radiographic image that is produced by the dental radiography system is shown.
  • the image includes images of a marker 502, a tooth 504, and a root 506.
  • the dental radiography software measures the length of the marker 502 and calibrates itself based on the measured length and the known length of the marker 502. For example, if the image is elongated, the dental radiography software may determine the proportional correction factor to be greater than 1 and may multiply all future measurements within the image by the proportional correction factor.
  • FIG. 5B a screenshot illustrating the dental radiography software being used to measure a length within the digital radiographic image is shown.
  • a user of the software places a mouse pointer (not shown) at a point 508 and clicks, marking the initial measuring point.
  • the point 508 corresponds to the top of the tooth 504.
  • the user places the mouse pointer at a point 510 and clicks, marking the final measuring point and creating a dashed line 512 between the points 508 and 510.
  • the point 510 corresponds to the apex of the root 506.
  • the software determines a length 514 between the points 508 and 510 based on a measured length between the points 508 and 510 and a correction factor (e.g., the proportional correction factor).
  • the software displays the length 514 to the user.
  • the dental radiography software includes a data file function (not shown) that provides one or more predetermined data points in which measured data points from a digital radiographic image may be compared to.
  • the dental radiography software calibrates itself based on the predetermined data points and the measured data points. Accordingly, the dental radiography software may be used to accurately measure lengths within the captured image.
  • doctors would benefit from the ability to accurately measure the dimension and the proximity of cancerous tissue to vital organs/surrounding tissue.
  • a Chiropractor can measure the amount of compression on a spinal disc, along with other critical measurements.
  • a doctor will also benefit from the ability to accurately measure the length of a fracture, or the amount of lost length in long bones, which will help him to know where to reposition the bone(s).

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Medical Informatics (AREA)
  • Engineering & Computer Science (AREA)
  • Radiology & Medical Imaging (AREA)
  • Molecular Biology (AREA)
  • Biophysics (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Optics & Photonics (AREA)
  • Pathology (AREA)
  • Physics & Mathematics (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Dentistry (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Apparatus For Radiation Diagnosis (AREA)

Abstract

L'invention concerne un système d'étalonnage d'un système de radiographie numérique, comprenant un outil de mesure et un module de radiographie numérique. L'outil de mesure d'une longueur prédéterminée est disposé sur un capteur électronique. Le module de radiographie numérique produit une image radiographique numérique sur la base d'un signal provenant du capteur électronique, mesure une longueur mesurée de l'outil de mesure dans l'image, et s'étalonne lui-même sur la base des longueurs prédéterminées et mesurées.
PCT/US2008/071316 2007-07-27 2008-07-28 Système numérique d'étalonnage de rayons x Ceased WO2009018201A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US95231307P 2007-07-27 2007-07-27
US60/952,313 2007-07-27

Publications (1)

Publication Number Publication Date
WO2009018201A1 true WO2009018201A1 (fr) 2009-02-05

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040062358A1 (en) * 2000-10-11 2004-04-01 Imaging Therapeutics, Inc. Methods and devices for analysis of X-ray images
US20060133579A1 (en) * 2004-12-16 2006-06-22 Lee Samuel S Distortion corrector for digital radiograph

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040062358A1 (en) * 2000-10-11 2004-04-01 Imaging Therapeutics, Inc. Methods and devices for analysis of X-ray images
US20060133579A1 (en) * 2004-12-16 2006-06-22 Lee Samuel S Distortion corrector for digital radiograph

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