WO2013129811A1 - Procédé pour la réduction d'artefacts métalliques en tomodensitométrie (ct) - Google Patents

Procédé pour la réduction d'artefacts métalliques en tomodensitométrie (ct) Download PDF

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Publication number
WO2013129811A1
WO2013129811A1 PCT/KR2013/001493 KR2013001493W WO2013129811A1 WO 2013129811 A1 WO2013129811 A1 WO 2013129811A1 KR 2013001493 W KR2013001493 W KR 2013001493W WO 2013129811 A1 WO2013129811 A1 WO 2013129811A1
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WIPO (PCT)
Prior art keywords
image
metal
citi
matching
scan data
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PCT/KR2013/001493
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English (en)
Korean (ko)
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전진환
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(주)제노레이
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T11/00—2D [Two Dimensional] image generation
    • G06T11/003—Reconstruction from projections, e.g. tomography
    • G06T11/008—Specific post-processing after tomographic reconstruction, e.g. voxelisation, metal artifact correction
    • 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
    • A61B6/02—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
    • A61B6/03—Computed tomography [CT]
    • 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
    • A61B6/02—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
    • A61B6/03—Computed tomography [CT]
    • A61B6/032—Transmission computed tomography [CT]
    • 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
    • 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
    • A61B6/52—Devices using data or image processing specially adapted for radiation diagnosis
    • A61B6/5258—Devices using data or image processing specially adapted for radiation diagnosis involving detection or reduction of artifacts or noise

Definitions

  • the present invention relates to a method for reducing metal artifacts of Citi used for dental imaging and the like.
  • tooth damage occurs, such as tooth decay in the patient's teeth
  • the damaged tooth is filled with dental fillings or replaced with prosthetic devices.
  • the metallic object such as the dental filler or the prosthetic device hardly penetrates the X-rays, so that the surrounding soft tissue or Skeletal structures create metal artifacts, such as streak artifacts and star-burst artifacts.
  • the metal artifact affects an image of not only itself but also other objects around it, causing a problem of obscuring the X-ray city image.
  • a problem of erroneously diagnosing a patient's dental condition is caused by an unclear X-ray Citi image due to a metal artifact and a doctor reading an unclear X-ray Citi image.
  • the technical problem to be achieved by the present invention is to provide a Citi metal artifact reduction method that significantly reduces the unclear Citi image by the metal artifacts.
  • the present invention provides a third step (S300) which is a matching process of a reconstructed image and a scan data image reconstructing a projection image by Citi to a stereoscopic image and
  • the fourth step (S400) which is a process of checking the 3D coordinates of the metal region in the reconstructed image using the matching result.
  • the method may further include a fifth step S500, which is a process of mapping and removing the identified 3D coordinate data to the projection image in the simulation.
  • the method may further include a sixth step S600 which is a process of correcting the projected image and a seventh step S700 which is a process of reconstructing the plurality of corrected projected images into a stereoscopic image.
  • the correcting of the projected image may be a process of correcting the metal part 612 to the value of the peripheral data to change the corrected projected image 700.
  • the registration process of the reconstructed image and the scan data image may be a process of acquiring three-dimensional surface scan data of a tooth using the intraoral scanner 400 and matching the three-dimensional surface scan data and the reconstructed image 300. .
  • the matching process may be a process of matching the metal circumference data 410 including the metal part 402 and the non-metal part 404 of the 3D surface scan data with the reconstructed image 300.
  • the effect of remarkably reducing the blurring of the Citi image by the metal artifacts is generated.
  • the present invention provides a process of matching the minimum metal circumference data including the metal part and the non-metal part of the 3D surface scan data with the metal circumference data including the metal part and the non-metal part of the reconstructed image during the registration process. This results in the use of minimal time and effort in the matching process.
  • 1 is a flowchart illustrating a method of reducing metal artifacts of Citi.
  • FIG. 2 is a schematic view showing up to the third step of FIG.
  • FIG. 3 is a schematic view of the third step after FIG. 1;
  • FIG. 4 is a schematic diagram showing images before and after the present invention is applied.
  • the present invention it is essential to use the scanned image to reduce the occurrence of metal artifacts in the Citi image by the metal material inserted into the human body, and the main field to which the present invention is applied is applied to the field of dental treatment or other medical fields. Can be.
  • FIG. 1 is a flowchart illustrating a method for reducing metal artifacts of Citi
  • FIG. 2 is a schematic diagram showing a third stage of FIG. 1
  • FIG. 3 is a schematic diagram showing a third stage after FIG. 1
  • Cimet artifact reduction method of the present invention is a first step (S100) which is a process of acquiring a projection image by computer tomography (CT) that proceeds through the start process, and a plurality of processes that proceed after the first step (S100)
  • the second step (S200) which is a process of reconstructing the projection image of the stereoscopic image
  • the third step (S300) which is a process of matching the reconstructed image and the scan data image which is performed after the second step (S200)
  • a process performed after the fourth step (S400) and the fourth step (S400) which is a process of checking the three-dimensional coordinates of the metal region in the reconstructed image by using the matching result performed after the third step (S300)
  • the fifth step (S500) which is a process of mapping and removing the confirmed 3D coordinate data to the projection image in the simulation
  • the sixth step which is a process of correcting the projected image, which is a process performed after the fifth step (S500) S600), and the
  • the process of acquiring the projection image by the Citi 100 which is the first step (S100), is a procedure generally performed in a dentistry, and the X-ray imaging in the patient's mouth is performed by using the Citi 100 device shown in FIG. And obtaining a plurality of projection images 200 as shown in FIG.
  • the photographing is performed while being rotated within a predetermined angle range around the mouth of the patient, thereby obtaining a plurality of projection images 200.
  • various image reconstruction algorithms may be applied to the process of reconstructing the plurality of projection images to the stereoscopic image, which is the second step (S200).
  • the conbeam city is based on the FBP (Filtered Back Projection).
  • FDK Feldkamp, Davis, Kress (FDK) has been used which has been improved to apply to (Conebeam CT).
  • the reconstructed image 300 obtained by the F decay is shown in (c) of FIG. 1, and in this case, three metals appear on the right molar portion of the lower jaw in the tooth image cross section 310, but the distortion of the image is caused by metal artifacts. This appears badly.
  • the 3D surface scan data of the tooth is obtained by using the oral scanner 400 and the plaster model, and the 3D surface scan data and the reconstruction This is a process of matching the image 300.
  • the metal part 402 and the minimum non-metal part of the 3D surface scan data are more than the entire 3D surface scan data and the entire reconstructed image 300.
  • the process of matching the metal circumference data 410 including the 404 with the metal circumference data including the metal part and the non-metal part of the reconstructed image 300 is performed.
  • the use of the metal circumference data 410 including the metal part 402 and the minimum non-metal part 404 is an unclear state of the reconstructed image 300 when only the metal part 402 is used. This is because registration is difficult.
  • the non-metal part 404 is absolutely necessary in the matching process, but as the non-metal part 404 is larger, the time and effort required for the matching process are increased, so it is preferable to use only the minimum part necessary for the matching process.
  • the metal display reconstruction image 500 illustrated in FIG. 2D is obtained.
  • the process of checking the three-dimensional coordinates of the metal region in the reconstructed image using the matching result of the fourth step (S400) is a three-dimensional matched in the metal display reconstructed image 500 as shown in FIG.
  • a process of checking 3D coordinates of a metal region corresponding to the metal part 402 of the surface scan data is performed.
  • the process of mapping and removing the identified three-dimensional coordinate data to the projection image in the simulation in the fifth step S500 may result in a simulation projection image 610 such as a projection image that may be obtained through Citi shooting by an algorithm. After that, only the 3D coordinate data of the metal region is mapped to and removed from the simulation projection image 610.
  • the above process is a case where the process of acquiring the reconstructed image through the projection image is reversed, and the plurality of projection images 600 obtained through the process are shown in FIG.
  • the metal part 612 corresponding to the metal part is displayed to be distinguished from other parts.
  • the process of correcting the projection image 600 of the sixth step S600 is performed by correcting the metal part 612 shown in (b) of FIG.
  • the FDK is used to reconstruct the plurality of corrected projection images 700 of the seventh step S700 into the stereoscopic image 800, and the reconstructed image 800 includes the right molar portion of the lower jaw. It can be seen that there are three metals around the arrow, but the metal artifacts are significantly reduced.
  • FIG. 4 the metal artifacts are significantly reduced in FIG. 4 (b) showing the case where the present invention is applied than in the case of FIG. 4 (a) showing the case where the present invention is not applied. Able to know.
  • the effect of remarkably reducing the blurring of the Citi image by the metal artifacts is generated.
  • the present invention provides a process of matching the minimum metal circumference data including the metal part and the nonmetal part of the 3D surface scan data with the metal circumference data including the metal part and the nonmetal part of the reconstructed image during the registration process. This results in the use of minimal time and effort in the matching process.
  • the present invention relates to a method for reducing metal artifacts of Citi used for dental imaging and the like, and by using the method of the present invention, it is possible to make an X-ray Citi image more clearly. It can be used for diagnostic techniques.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Medical Informatics (AREA)
  • Physics & Mathematics (AREA)
  • Biomedical Technology (AREA)
  • Animal Behavior & Ethology (AREA)
  • Biophysics (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Optics & Photonics (AREA)
  • Pathology (AREA)
  • Radiology & Medical Imaging (AREA)
  • Veterinary Medicine (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • High Energy & Nuclear Physics (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Pulmonology (AREA)
  • General Physics & Mathematics (AREA)
  • Dentistry (AREA)
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Abstract

La présente invention porte sur un procédé pour la réduction d'artefacts métalliques en tomodensitométrie (CT), comprenant : une première étape (S100) d'obtention d'une image de CT projetée ; une deuxième étape (S200) de reconstruction de l'image projetée en une image stéréoscopique ; une troisième étape (S300) de mise en correspondance de l'image reconstruite et d'une image de données de balayage ; et une quatrième étape (S400) de confirmation des coordonnées tridimensionnelles d'une zone métallique dans l'image reconstruite à l'aide du résultat de la mise en correspondance. Selon la présente invention, l'effet de réduction remarquable de la création d'images de CT obscures dues à des artefacts métalliques est réalisé.
PCT/KR2013/001493 2012-02-28 2013-02-25 Procédé pour la réduction d'artefacts métalliques en tomodensitométrie (ct) WO2013129811A1 (fr)

Applications Claiming Priority (2)

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KR1020120020120A KR20130098531A (ko) 2012-02-28 2012-02-28 씨티의 메탈 아티팩트 감소 방법
KR10-2012-0020120 2012-02-28

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9953441B2 (en) 2014-12-04 2018-04-24 Shenyang Neusoft Medical Systems Co., Ltd. Processing metal artifact in CT image
WO2020142397A1 (fr) * 2018-12-30 2020-07-09 Carestream Dental Llc Réduction améliorée d'artéfacts métalliques dans la reconstruction de faisceau conique
US11631211B2 (en) 2017-08-31 2023-04-18 3Shape A/S Volume rendering using surface guided cropping

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102037117B1 (ko) 2017-08-02 2019-11-29 재단법인 아산사회복지재단 구조유사도를 이용한 아티펙트 저감방법 및 프로그램 및 의료영상획득장치
KR102394444B1 (ko) 2019-12-26 2022-05-09 주식회사 에이치디엑스윌 듀얼 에너지 단층촬영 장치, 및 이를 이용한 금속 이미지 구분 방법

Citations (4)

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JP2007520300A (ja) * 2004-02-05 2007-07-26 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ ボクセル組織クラスを分散するｃｔにおける高減衰オブジェクトにより生じる画像全体のアーティファクトの縮小
KR20090078665A (ko) * 2008-01-15 2009-07-20 (주)이우테크놀로지 엑스 레이 씨티 촬영 영상의 메탈 아티팩트를 제거하는방법
JP2010201089A (ja) * 2009-03-05 2010-09-16 Kgt Inc 医療用三次元画像におけるアーティファクトの自動削除処理方法、自動削除処理装置及び自動削除処理プログラム
WO2011133662A1 (fr) * 2010-04-20 2011-10-27 Imaging Sciences International Llc Réduction et élimination d'artéfacts d'un ensemble de données de radiographie dentaire à trois dimensions à l'aide d'informations de balayage de surface

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
JP2007520300A (ja) * 2004-02-05 2007-07-26 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ ボクセル組織クラスを分散するｃｔにおける高減衰オブジェクトにより生じる画像全体のアーティファクトの縮小
KR20090078665A (ko) * 2008-01-15 2009-07-20 (주)이우테크놀로지 엑스 레이 씨티 촬영 영상의 메탈 아티팩트를 제거하는방법
JP2010201089A (ja) * 2009-03-05 2010-09-16 Kgt Inc 医療用三次元画像におけるアーティファクトの自動削除処理方法、自動削除処理装置及び自動削除処理プログラム
WO2011133662A1 (fr) * 2010-04-20 2011-10-27 Imaging Sciences International Llc Réduction et élimination d'artéfacts d'un ensemble de données de radiographie dentaire à trois dimensions à l'aide d'informations de balayage de surface

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9953441B2 (en) 2014-12-04 2018-04-24 Shenyang Neusoft Medical Systems Co., Ltd. Processing metal artifact in CT image
US11631211B2 (en) 2017-08-31 2023-04-18 3Shape A/S Volume rendering using surface guided cropping
US11900526B2 (en) 2017-08-31 2024-02-13 3Shape A/S Volume rendering using surface guided cropping
WO2020142397A1 (fr) * 2018-12-30 2020-07-09 Carestream Dental Llc Réduction améliorée d'artéfacts métalliques dans la reconstruction de faisceau conique
US20220110596A1 (en) * 2018-12-30 2022-04-14 Carestream Dental Llc Improved metal artifacts reduction in cone beam reconstruction
US11786193B2 (en) * 2018-12-30 2023-10-17 Carestream Dental Llc Metal artifacts reduction in cone beam reconstruction

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