WO2012102052A1 - Procédé et dispositif d'imagerie radiologique - Google Patents

Procédé et dispositif d'imagerie radiologique Download PDF

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Publication number
WO2012102052A1
WO2012102052A1 PCT/JP2012/000517 JP2012000517W WO2012102052A1 WO 2012102052 A1 WO2012102052 A1 WO 2012102052A1 JP 2012000517 W JP2012000517 W JP 2012000517W WO 2012102052 A1 WO2012102052 A1 WO 2012102052A1
Authority
WO
WIPO (PCT)
Prior art keywords
radiation
alignment
image
density unevenness
radiographic
Prior art date
Application number
PCT/JP2012/000517
Other languages
English (en)
Japanese (ja)
Inventor
隆浩 川村
Original Assignee
富士フイルム株式会社
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 富士フイルム株式会社 filed Critical 富士フイルム株式会社
Publication of WO2012102052A1 publication Critical patent/WO2012102052A1/fr

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    • 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
    • A61B6/587—Alignment of source unit to detector unit
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/70—Determining position or orientation of objects or cameras
    • G06T7/73—Determining position or orientation of objects or cameras using feature-based methods
    • 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
    • A61B6/42—Arrangements for detecting radiation specially adapted for radiation diagnosis
    • A61B6/4291—Arrangements for detecting radiation specially adapted for radiation diagnosis the detector being combined with a grid or grating
    • 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
    • A61B6/5211—Devices using data or image processing specially adapted for radiation diagnosis involving processing of medical diagnostic data
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/10—Image acquisition modality
    • G06T2207/10116—X-ray image
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/30—Subject of image; Context of image processing
    • G06T2207/30004—Biomedical image processing

Definitions

  • Patent Document 5 since the technique described in Patent Document 5 requires a sensor to be provided in the photographing apparatus, the structure of the apparatus becomes complicated and the cost of the apparatus also increases.
  • the present invention has been made in view of the above circumstances, and without correcting the radiation image and without increasing the cost of the apparatus, the density unevenness of the radiation image due to the alignment error between the radiation source and the radiation detector is reduced.
  • the purpose is to reduce.
  • a radiographic imaging apparatus includes an imaging apparatus main body having a radiation source, A radiation image of the subject is acquired by detecting radiation emitted toward the subject from the radiation source by a radiation detector integrated with a grid that is configured separately from the imaging apparatus main body.
  • Radiological image acquisition means Density unevenness detecting means for detecting density unevenness of the radiation image;
  • Alignment acquisition means for acquiring alignment of the radiation source with respect to the radiation detector based on the density unevenness.
  • “Alignment” means an angle formed by an optical axis of radiation emitted from a radiation source and a perpendicular passing through a detection surface of the radiation detector.
  • the radiation detector used in the present invention has an integrated grid, as an alignment, the optical axis of the radiation emitted from the radiation source is incident on the grid integrated with the radiation detector. It is good also as an angle made with the perpendicular which passes along the center of a surface, especially a radiation incident surface.
  • the grid for example, lead or the like that does not transmit radiation and aluminum or wood that is easily transmitted at a fine pitch of about 10 pieces / mm are alternately arranged so that the radiation scattered by the subject is not irradiated to the radiation detector. What is arranged and constituted can be used.
  • the radiographic image capturing apparatus further includes a storage unit that stores a table that defines the relationship between various types of density unevenness and the alignment,
  • the alignment acquisition means may be means for acquiring an alignment corresponding to the detected density unevenness with reference to the table.
  • the radiographic image capturing apparatus may further include notification means for notifying the acquired alignment.
  • the radiographic image capturing apparatus may further include warning means for giving a warning when the alignment exceeds a predetermined range.
  • the grid may be a parallel grid.
  • a radiographic imaging method includes an imaging apparatus body having a radiation source, A radiation image of the subject is acquired by detecting radiation emitted toward the subject from the radiation source by a radiation detector that is configured separately from the imaging apparatus main body and integrated with a grid.
  • a radiographic imaging method in a radiographic imaging device comprising a radiographic image acquisition means, Detecting density unevenness in the radiation image; An alignment of the radiation source with respect to the radiation detector is acquired based on the density unevenness.
  • density unevenness of a radiographic image obtained by detecting radiation emitted from a radiation source toward a subject with a radiation detector is detected, and based on the detected density unevenness, the radiation detector is detected.
  • the alignment of the radiation source with respect to is obtained. For this reason, based on the acquired alignment, the optical axis of the radiation emitted from the radiation source matches the perpendicular passing through the center of the detection surface of the radiation detector and the perpendicular passing through the center of the radiation incident surface of the grid.
  • the operator can adjust the alignment of the radiation source and the relative position of the radiation source and the radiation detector.
  • the diagnosis using the radiographic image can be performed accurately. Further, since it is not necessary to provide a sensor for detecting the positional relationship between the radiation source and the radiation detector, the configuration of the apparatus can be simplified and the cost of the apparatus can be reduced.
  • the radiation dose decreases toward the end of the radiation detector in the direction orthogonal to the grid pitch. Therefore, for example, when acquiring a radiographic image of the chest, in order to eliminate the difference in density between the left and right lungs, the optical axis of the radiation is made to coincide with the center position of the left and right lungs, that is, the center position of the patient's chest as the subject.
  • the alignment of the radiation source and the relative position between the radiation source and the radiation detector can be adjusted so that the optical axis of the radiation coincides with the center of the chest of the patient, the radiation of the chest is particularly improved.
  • the difference in concentration between the left and right lungs can be improved.
  • the alignment can be acquired quickly with a simple calculation.
  • the operator can adjust the alignment of the radiation source and the relative position between the radiation source and the radiation detector according to the notified alignment.
  • FIG. Figure which shows schematic structure of the radiographic imaging apparatus by embodiment of this invention.
  • the figure for explaining the change of the irradiation angle of radiation The block diagram which shows schematic structure inside the computer of the radiographic imaging apparatus shown in FIG. Figure showing an example of a radiographic image
  • FIG. Figure showing an example of a radiographic image
  • FIG. 1 is a diagram showing a schematic configuration of a radiographic imaging apparatus according to an embodiment of the present invention.
  • the radiographic imaging device 1 according to the present embodiment is a mobile device, and a control device 12 that controls the radiographic imaging device 1 is mounted on a movable carriage 11.
  • the control device 12 includes a computer 2, a monitor 3 connected to the computer 2, and an input unit 4.
  • the computer 2, the monitor 3, and the input unit 4 are illustrated as being connected to the outside of the control device 12 for the sake of explanation, but are mounted on the control device 12. is there.
  • the supporting carriage 13 is attached to the movable carriage 11 so as to be able to turn vertically with respect to the movable carriage 11.
  • the column 13 is provided with a radiation source support arm 14 that can move in the vertical direction along the column 13 and in a direction perpendicular to the length direction of the column 13.
  • the rotation of the radiation source support arm 14, the vertical direction, and the movement in the direction perpendicular to the column 13 are controlled by an arm controller 31 incorporated in the column 13.
  • a radiation irradiation unit 15 is attached to the tip of the radiation source support arm 14.
  • a radiation source 16 and a radiation source controller 32 are accommodated in the radiation irradiation unit 15.
  • a collimator 17 for setting a radiation irradiation range is attached to the lower part of the radiation irradiation unit 15.
  • the collimator 17 is provided with an irradiation field lamp (not shown). When positioning for preparation for photographing, the irradiation field lamp is turned on to set the radiation irradiation range on the subject. It is possible.
  • the radiation source controller 32 controls the timing of irradiating radiation from the radiation source 16 and the radiation generation conditions (tube current, time, tube current time product, etc.) in the radiation source 16.
  • the radiation detector 20 can repeatedly perform recording and reading of a radiation image, and may use a so-called direct type radiation detector that directly receives radiation to generate charges, or radiation. May be used as a so-called indirect radiation detector that converts the light into visible light and converts the visible light into a charge signal.
  • a radiation image signal readout method a radiation image signal is read out by turning on and off a TFT (thin film transistor) switch, or a radiation image signal by irradiating reading light.
  • TFT thin film transistor
  • the computer 2 includes a central processing unit (CPU) and a storage device such as a semiconductor memory, a hard disk, and an SSD, and the control unit 2a, the radiation image storage unit 2b, the density as shown in FIG. A non-uniformity detection unit 2c, an alignment acquisition unit 2d, and a display control unit 2e are configured.
  • the control unit 2a also functions as warning means in the present invention.
  • the controller 2a outputs predetermined control signals to the various controllers 31 to 34 to control the entire system. A specific control method will be described later.
  • the density unevenness detection unit 2c detects the density unevenness of the radiographic image based on the radiographic image signal acquired by the radiation detector 20.
  • the density unevenness detection unit 2c acquires a region in the region where the subject of the radiographic image is captured, where the radiation irradiation is uniform with respect to the entire region of the radiation detector 20 and has substantially the same density.
  • the radiographic image is a chest front radiation image of a human body
  • an area A in which the overlapping ribs existing in the outer contour portions on the left and right sides of the thorax in the chest front radiographic image are captured.
  • a region surrounded by a solid line in white is acquired as a region having substantially the same density.
  • FIG. 5 is a flowchart showing processing performed in the present embodiment.
  • step ST3 density unevenness in the pre-shot image is detected by the density unevenness detection unit 2c (step ST3). Specifically, as described above, a linear model Z (x, y) approximating density unevenness is created as unevenness data. Since the pre-shot image is acquired by photographing the subject 22 with a low dose, there are many noises. However, since the density unevenness represents a tendency of the density of the entire image, the density unevenness can be accurately detected even if there is a lot of noise.
  • the alignment corresponding to the detected density unevenness is acquired with reference to a table that defines the relationship between various density unevenness and alignment, the alignment can be acquired quickly by a simple calculation.

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

Abstract

Le problème à résoudre dans le cadre de la présente invention consiste à réduire les irrégularités de densité d'image radiologique découlant d'erreurs d'alignement entre une source de rayonnement et un détecteur de rayonnement, sans correction des images radiologiques ni augmentation du coût d'un dispositif d'imagerie radiologique. Pour ce faire, on utilise une unité de détection d'irrégularités de densité (2c), qui détecte les irrégularités de densité dans une image radiologique obtenue par imagerie ; en se référant à une table qui spécifie une relation entre différentes formes d'irrégularités de densité et d'alignements, une unité d'acquisition d'alignement (2d) réalise l'acquisition de l'alignement correspondant aux irrégularités de densité détectées. Une unité de commande d'affichage (2e) affiche ledit alignement sur un moniteur (3). Un opérateur peut ainsi vérifier l'alignement entre une source de rayonnement et un détecteur de rayonnement, et corriger ledit alignement si nécessaire.
PCT/JP2012/000517 2011-01-27 2012-01-27 Procédé et dispositif d'imagerie radiologique WO2012102052A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011014738A JP2012152417A (ja) 2011-01-27 2011-01-27 放射線画像撮影装置および方法
JP2011-014738 2011-06-29

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WO2012102052A1 true WO2012102052A1 (fr) 2012-08-02

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WO (1) WO2012102052A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016028020A1 (fr) * 2014-08-22 2016-02-25 Samsung Electronics Co., Ltd. Appareil de radiographie et procédé de commande d'un appareil de radiographie

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6845047B2 (ja) * 2017-03-09 2021-03-17 富士フイルム株式会社 医用画像撮影制御装置、方法およびプログラム

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06154207A (ja) * 1992-11-18 1994-06-03 Canon Inc Ｘ線撮影装置及びその位置合わせ方法
JPH0966054A (ja) * 1995-09-01 1997-03-11 Canon Inc Ｘ線撮影装置
JP2004135748A (ja) * 2002-10-16 2004-05-13 Fuji Photo Film Co Ltd 放射線画像撮影システムおよび放射線画像検出器
JP2008132033A (ja) * 2006-11-27 2008-06-12 Hitachi Medical Corp Ｘ線撮像装置
JP2010005373A (ja) * 2008-02-14 2010-01-14 Fujifilm Corp 放射線画像補正方法および装置ならびにプログラム

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06154207A (ja) * 1992-11-18 1994-06-03 Canon Inc Ｘ線撮影装置及びその位置合わせ方法
JPH0966054A (ja) * 1995-09-01 1997-03-11 Canon Inc Ｘ線撮影装置
JP2004135748A (ja) * 2002-10-16 2004-05-13 Fuji Photo Film Co Ltd 放射線画像撮影システムおよび放射線画像検出器
JP2008132033A (ja) * 2006-11-27 2008-06-12 Hitachi Medical Corp Ｘ線撮像装置
JP2010005373A (ja) * 2008-02-14 2010-01-14 Fujifilm Corp 放射線画像補正方法および装置ならびにプログラム

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016028020A1 (fr) * 2014-08-22 2016-02-25 Samsung Electronics Co., Ltd. Appareil de radiographie et procédé de commande d'un appareil de radiographie
US10390781B2 (en) 2014-08-22 2019-08-27 Samsung Electronics Co., Ltd. X-ray apparatus and method of controlling X-ray apparatus

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