WO2008119873A1 - Dispositif panoramique à rayons x et placement d'une couche devant être imagée pour une imagerie panoramique - Google Patents

Dispositif panoramique à rayons x et placement d'une couche devant être imagée pour une imagerie panoramique Download PDF

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Publication number
WO2008119873A1
WO2008119873A1 PCT/FI2008/050125 FI2008050125W WO2008119873A1 WO 2008119873 A1 WO2008119873 A1 WO 2008119873A1 FI 2008050125 W FI2008050125 W FI 2008050125W WO 2008119873 A1 WO2008119873 A1 WO 2008119873A1
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WIPO (PCT)
Prior art keywords
panoramic
imaging
image
ray
side profile
Prior art date
Application number
PCT/FI2008/050125
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English (en)
Inventor
Christian De Godzinsky
Sakari Kettunen
Original Assignee
Planmeca Oy
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 Planmeca Oy filed Critical Planmeca Oy
Priority to CN2008800139036A priority Critical patent/CN101668485B/zh
Priority to KR1020127032905A priority patent/KR101474098B1/ko
Publication of WO2008119873A1 publication Critical patent/WO2008119873A1/fr

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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
    • A61B6/50—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
    • A61B6/04—Positioning of patients; Tiltable beds or the like
    • 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
    • A61B6/46—Arrangements for interfacing with the operator or the patient
    • A61B6/467—Arrangements for interfacing with the operator or the patient characterised by special input means
    • A61B6/469—Arrangements for interfacing with the operator or the patient characterised by special input means for selecting a region of interest [ROI]
    • 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
    • A61B6/48—Diagnostic techniques
    • A61B6/488—Diagnostic techniques involving pre-scan acquisition
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06N—COMPUTING ARRANGEMENTS BASED ON SPECIFIC COMPUTATIONAL MODELS
    • G06N3/00—Computing arrangements based on biological models
    • G06N3/02—Neural networks
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis

Definitions

  • the invention concerns a panoramic x-ray apparatus according to patent claim 1 and a method according to patent claim 7 for positioning a layer to be imaged for panoramic x-ray imaging.
  • Panoramic x-ray imaging is layer imaging, tomographic imaging, in which during an imaging scan a radiation source and an image information receiver are turned during an exposure with respect to dental arch in such a way that in the image being formed, essentially the dental arch becomes imaged sharp while other anatomies of the skull get blurred.
  • the imaging scan and the related turning movement of the imaging means creating the tomographic effect are performed on a horizontal plane, in some special imaging modes one may produce tomographic effect by also moving partly on some other than horizontal plane.
  • a dental panoramic x-ray image shows the dental arch as spread out on a plane. The panoramic image gives a good overview of the whole set of teeth of a patient, including jaw joints.
  • the most essential diagnostic value of a panoramic x-ray image relates to imaging the roots of the teeth. Due to the shape of the anatomy to be imaged, the imaging geometry of the panoramic x-ray imaging typically produces a tomographic image in which, regarding the frontal area of the dental arch, the layer becoming imaged sharp is relatively thin, typically only ca. 10 mm. As, due to the way the imaging scan is realized, the layer that becomes imaged sharp is wider in the molar area, several tens of mm even, positioning the dental arch at the centre of the layer becoming imaged is not too critical in that area.
  • the operator When using the most traditional panoramic x-ray apparatus, the operator must estimate the location of the incisor roots externally on the grounds of the side profile of patient's face, and of the crown surfaces of the teeth that are visible. This estimation is particularly difficult when extremely buck or withdrawn incisors are concerned, but as the incisors are somewhat tilted even in the case of normal occlusion, estimating location of their roots is always difficult. In practice, less failed positionings are typically made by operators having sound professional skills and experience.
  • Positioning lights have also been used to assist positioning of the layer to be imaged by e.g. driving a vertical, layer-positioning light beam illuminating the patient from the side to a position in which the incisor roots presumingly are located and by arranging the imaging apparatus to realize the imaging movement according to the location of this positioning light beam.
  • this kind of positioning is only based on "an educated guess" of the location of the incisor roots, which the operator makes based on external features. Thus, even an experienced operator can also fail in the positioning.
  • Prior art includes even other positioning techniques based on analysis of external features of anatomy, such as solutions based on use of distance sensors and cameras.
  • solutions based on use of distance sensors and cameras Even their function is mostly based on examination of external facial features of a patient and as a consequence, they don't necessarily give a correct picture of the actual structure of the set of teeth.
  • these kinds of solutions may require, inter alia, integration of various accessories to the imaging apparatus and other possible special arrangements, which make the imaging apparatus more complicated and may even make difficult or slow down the implementation of the imaging process.
  • An object of the invention is to develop positioning of an anatomy in connection with dental panoramic x-ray imaging, particularly in view of how a desired vertical tomographic layer containing the incisor roots may be positioned into the layer the panoramic x-ray apparatus images as sharp.
  • an object of the invention is to reduce the need for retake imagings caused by faulty positionings .
  • An object is also embodiments, which enable realization of the abovementioned object in such a way that the imaging apparatus can still be realized as relatively simple without a need to arrange thereto a considerable amount of new devices, components and/or functionalities .
  • an object of the invention is embodiments, which enable the desired layer to become automatically imaged sharp in a panoramic image after the anatomy has been positioned to a patient support means of the imaging apparatus.
  • a side profile x-ray image (a transillumination image orienting in the direction of the mid-sagittal-plane) is taken of the frontal area of a dental arch being positioned to be imaged, such a vertical tomographic layer is determined from said x-ray image which is optimal considering the layer which upon panoramic x-ray imaging gets imaged sharp from the incisor area of the dental arch, after which imaging means of the panoramic apparatus are driven such that particularly this layer gets imaged sharp in the panoramic x-ray image.
  • the invention enables imaging of especially the desired tomographic layer based on, instead of presumption, the true structure of the anatomy being imaged.
  • a panoramic x-ray- apparatus is used, a horizontal degree of freedom of movement of the imaging means of which is arranged to enable, in addition to the actual panoramic imaging, taking a side profile x-ray image according to the invention as well.
  • Setting of the layer desired to become imaged sharp can be done e.g. by an operator by pointing it e.g. from a digital x-ray image shown on a display arranged in the x-ray apparatus, or location of incisor roots can also be determined according to the invention automatically with the help of a pattern recognition algorithm, e.g. by means of image processing and feature extracting known as such.
  • pattern recognition based on a neural network is used in which location of the desired layer is made into function's approximation problem and location of the desired layer is determined from the preview image with the help of the neuron network as a function of features which are fundamentally easy to define and which represent the structure of the anatomy.
  • neuron network enables use of pattern recognition also when the anatomy to be imaged is such that not necessarily each of the reference points of the anatomy defined to be a source of information for pattern recognition is programmatically recognizable.
  • the neuron network can be arranged not only to learn to find the correct layer, but it can also be taught to recognize the anatomy of the patient.
  • Fig. 1 presents a typical dental panoramic x-ray apparatus
  • Fig. 2 presents a patient positioned at a patient support means for panoramic imaging
  • Fig. 3 presents variation of width of a typical tomographic layer formed upon panoramic imaging along various sections of a dental arch and Fig. 2 presents a patient positioned at a patient support means for panoramic imaging,
  • Fig. 3 presents variation of width, of a typical tomographic layer formed upon panoramic imaging along various sections of a dental arch and
  • Fig. 4 presents a side profile x-ray image used in the invention and, therein, location of the tomographic layer desired to become imaged sharp in a panoramic image from the frontal area of a dental arch.
  • Fig. 1 presents a basic construction of a typical panoramic x-ray apparatus.
  • An apparatus according to Fig. 1 comprises a column-shaped body part (11) and a horizontal support arm (12) attached to the body part.
  • an imaging arm (13) Essentially at the other end of the support arm (12), there is arranged an imaging arm (13) , a so-called C-arm, which supports an image information receiver (14) and a radiation source (15) .
  • a patient support means (16) is arranged to the body part (11) .
  • An imaging arm (13) is arranged to be rotated in relation to the support arm (12) .
  • the apparatus construction suitable to be used in the invention has to enable movement of the imaging arm (13) on a horizontal plane in such a way that the imaging means can be positioned for taking a side profile image of the anatomy positioned in the patient support means (16) .
  • This can be realized e.g. by arranging an x, y - degree of freedom of movement to a construction (17) with the help of which the imaging arm (13) is attached to the support arm (12) .
  • a construction (17) with the help of which the imaging arm (13) is attached to the support arm (12) .
  • Such a panoramic x-ray apparatus known as such can be used in which between the imaging arm (13) and the support arm (12) there has been arranged an element, which has been arranged turnable in relation to both of these arms and around two vertical rotational axes locating at a distance from each other.
  • Fig. 2 presents a patient positioned at the patient support means (16) for panoramic imaging.
  • Prior art knows a number of kinds of patient support means the purpose of which is to help the patient to remain stationary for the duration of the imaging event, which lasts considerably long.
  • the solution presented in Fig. 2 comprises a patient Figure 3 demonstrates how the width of the tomographic layer becoming imaged in panoramic imaging changes in different areas of the dental arch when the imaging means are driven according to the geometry of an imaging scan typically used in panoramic imaging.
  • the width of the tomographic layer formed in the imaging is thus typically of the order of magnitude of 10 mm in the frontal area of the dental arch and considerably wider in the molar area.
  • an exemplary area which in view of the invention covers a large enough part of the anatomy considering positioning of the location of the tomographic layer desired to become imaged sharp.
  • the width of this area can be e.g. ca. 30 mm.
  • Fig. 4 one tomographic layer of ca. 10 mm is demonstrated in Fig. 4 with dashed lines, which layer in the case of the anatomy presented in that Fig. might be desired to be chosen to be the layer that gets imaged sharp in panoramic imaging.
  • the patient of Fig. 4 has a relatively normal bite, thereby it is possible to get the roots of both upper and lower teeth visible.
  • an x-ray image of the side profile of the anatomy is taken, with the help of which choosing of the layer to get imaged sharp in the panoramic image may be realized based on the actual structure of the teeth.
  • this x-ray image which is taken only for the purpose of positioning can be taken by generating a relatively small radiation dose - preferably, as there is no specific need to get the soft tissue, among other things, visible in this image, by using x-radiation generated with a relatively high voltage.
  • the voltage and the current of the x-ray tube are chosen in such a way that one gets as high a contrast of the image and as small a dose absorbed into the patient as possible.
  • the current is kept low, one gets with high voltages as high a contrast as possible between the soft tissue and the bone. If e.g. a voltage of 80 kV and a current of 1 mA are used and the area from which the side profile image is taken is properly limited, it is possible to reach a radiation dose which is e.g. below 3 %, or even less, of the dose produced by the actual panoramic imaging scan.
  • the x-ray image taken from the side of the anatomy forming an essential part of the invention may in principle be taken in many ways, if necessary by arranging to a panoramic x-ray apparatus a separate imaging sensor particularly for this purpose.
  • a separate imaging sensor particularly for this purpose e.g., one uses the imaging sensor already existing in a digital panoramic x-ray apparatus. Aligning and possible scanning movement of the beam needed for the imaging can be realized in many ways obvious to a man skilled in the art.
  • One possibility to produce a side profile image is to linearly drive the radiation source
  • a panoramic imaging apparatus in which one has arranged for the imaging means the degree of freedom of movement needed for taking both the panoramic image and the side profile x-ray image.
  • control system of the apparatus is arranged to recognize in a suitable way the location, in relation to the imaging means, of the coordinates that will be delivered to it concerning location of the layer desired to become imaged sharp in the panoramic x-ray image.
  • one embodiment of the invention comprises a control system of a panoramic x-ray apparatus, which is at all times aware of, or which as a response to an impulse received begins to follow or to save to a memory, where the imaging means are or were located in the set of coordinates the area of their degree of freedom of movement covers .
  • the layer desired to become imaged can be set e.g. by pointing it manually from a side profile image to the imaging apparatus or the layer can be arranged to become automatically set by a suitable solution based on computer vision.
  • the side profile x-ray image of the incisor area of the patient is taken before taking the actual panoramic image.
  • This image may be arranged to be shown on a separate computer display or on a display arranged to the actual x-ray apparatus. After location of the desired layer has been determined from the image, this information is provided to the imaging apparatus- e.g. by directly pointing it from the image shown on the display.
  • the x-ray apparatus already holds information of those coordinates of the horizontal plane from which the side profile image for determining location of the tomographic layer has been taken, and as the actual panoramic image will be taken in the same set of coordinates, the geometry may be quite simply calculated according to which the panoramic image should be taken so that the layer of the incisor area becoming imaged sharp would hit the desired location of the anatomy positioned at the patient support means.
  • an algorithm to be used for controlling the panoramic apparatus may comprise e.g. the following measures: - Taking a digital side profile x-ray image of the anatomy in the set of coordinates covered by the area of freedom of movement of the imaging means recognized by the imaging apparatus
  • a method is used in which such features are searched from the side profile x-ray image based on which it is possible e.g. with the help of neuron networks to conclude location of the layer desired to become imaged sharp.
  • a similar pre-processing is always done on the side profile image prior to using the actual feature searching algorithm in order to have images taken of different anatomies to be of the same greyscale value with each other.
  • features of the anatomy searched for by the algorithm should represent location of an incisor and its roots as precisely as possible.
  • the operator would set the desired layer to the preview image by estimating location of the tip of the root from the image and would place the center of the layer e.g. near the base of the incisor root of the maxilla.
  • the layer automatically, the automatic localization of the tip of the root, the apex, may be difficult.
  • the points to be recognized should be easily and faultlessly recognizable, one acts according to one preferable embodiment of the invention such that a group of more easily recognizable points are searched from the side profile image which represent the size and the position of the anatomy being imaged.
  • the tip of a tooth is one apparent such a point as it is easily recognizable for its wide contrast.
  • the inclination angle of the frontal edge of the jawbone can be considered as a significant feature in view of position of the incisors. Even two values can be specified to the inclination angle from different parts of the anatomy and by using different methods.
  • their size tells something about the location of the root of a tooth.
  • size of a tooth can be determined by finding from the image the bones of balate and as a straight extension thereof the anterior nasal spine. The length of a tooth may be presumed to be in relation to the distance between the tip of the tooth and this spine.
  • the size may be estimated e.g. by finding the tip of the jaw, the distance from which to the tip of the lower frontal incisor presumably being proportional to the length of the lower teeth.
  • a neuron network is used as an approximator for a function, which approximates location of the desired layer as a function of the features identified from the side profile image.
  • the features that have been found can be combined and their interdependences sorted out.
  • location of the layer can be made into a function whose value depends on the features that have been found.

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  • Engineering & Computer Science (AREA)
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Abstract

L'invention concerne un appareil panoramique à rayons X et un procédé pour positionner une couche devant être imagée pour une imagerie panoramique dentaire par rayons X. L'appareil à rayons X comprend une source de rayonnement (15) et un récepteur d'informations d'image (14) disposé à une certaine distance l'un de l'autre au niveau d'une partie de bras tournant (13). Dans l'invention, une image par rayons X de profil latéral est prise de la zone avant d'une arcade dentaire positionnée pour être imagée, une couche tomographique verticale de la zone des incisives est déterminée à partir de l'image par rayons X de profil latéral en question qui serait optimale compte tenu de la couche devenant imagée de façon précise en imagerie panoramique par rayons X de l'arcade dentaire et, par la suite, les moyens d'imagerie (14, 15) sont entraînés pendant l'exposition panoramique de telle sorte que la couche choisie à partir de l'image par rayons X de profil latéral devienne imagée de façon précise dans l'image panoramique par rayons X.
PCT/FI2008/050125 2007-03-19 2008-03-19 Dispositif panoramique à rayons x et placement d'une couche devant être imagée pour une imagerie panoramique WO2008119873A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN2008800139036A CN101668485B (zh) 2007-03-19 2008-03-19 全景x射线设备和用于全景成像的待成像层的定位
KR1020127032905A KR101474098B1 (ko) 2007-03-19 2008-03-19 파노라마 엑스선 장치 및 파노라마 이미징을 위한 이미징될 층의 위치 설정

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20070219A FI125008B (fi) 2007-03-19 2007-03-19 Panoraamaröntgenlaite ja kuvautuvan kerroksen asettaminen panoraamakuvausta varten
FI20070219 2007-03-19

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WO2008119873A1 true WO2008119873A1 (fr) 2008-10-09

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KR (2) KR101268243B1 (fr)
CN (1) CN101668485B (fr)
FI (1) FI125008B (fr)
WO (1) WO2008119873A1 (fr)

Cited By (2)

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Publication number Priority date Publication date Assignee Title
KR101094180B1 (ko) 2009-11-10 2011-12-14 주식회사바텍 파노라마 영상 획득 방법 및 장치
RU2766802C2 (ru) * 2017-03-17 2022-03-15 Планмека Ой Устройство рентгеновской визуализации и устройство для поддержки пациента

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CN102727244A (zh) * 2012-07-10 2012-10-17 南方医科大学 一种牙科x线射线设备中固位用的咬合叉
CN103099631B (zh) * 2013-02-22 2015-02-25 合肥美亚光电技术股份有限公司 一种立式x光摄影设备
FI125761B (en) * 2013-12-18 2016-02-15 Planmeca Oy Generation of panoramic images of teeth
CN105741239B (zh) * 2014-12-11 2018-11-30 合肥美亚光电技术股份有限公司 牙齿全景图像的生成方法、装置及用于拍摄牙齿的全景机
FI128589B (fi) * 2016-12-30 2020-08-31 Planmeca Oy Tietokonetomografia ja kuvautuvaksi halutun anatomian asemointi
FI127574B (fi) * 2017-03-17 2018-09-14 Planmeca Oy Röntgenkuvauslaite ja potilastuki
WO2022092594A1 (fr) * 2020-10-28 2022-05-05 주식회사 메디트 Dispositif de traitement d'image buccale et procédé de traitement d'image buccale
WO2023093748A1 (fr) * 2021-11-24 2023-06-01 余文锐 Système d'imagerie buccale par rayons x à faisceau conique et procédé de positionnement rapide associé
KR102436539B1 (ko) * 2022-05-15 2022-08-24 정세환 구강 파노라마 이미지 촬영 및 관리 시스템
CN116602702B (zh) * 2023-06-05 2023-11-17 珠海西格医疗设备有限公司 一种基于高频直流恒压控制的牙科x射线机

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Cited By (3)

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Publication number Priority date Publication date Assignee Title
KR101094180B1 (ko) 2009-11-10 2011-12-14 주식회사바텍 파노라마 영상 획득 방법 및 장치
US8634621B2 (en) 2009-11-10 2014-01-21 Vatech Co., Ltd. Method and apparatus for obtaining panoramic images
RU2766802C2 (ru) * 2017-03-17 2022-03-15 Планмека Ой Устройство рентгеновской визуализации и устройство для поддержки пациента

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FI20070219A0 (fi) 2007-03-19
CN101668485A (zh) 2010-03-10
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KR20090122294A (ko) 2009-11-26
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