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WO1994004977A1 - Procede d'enregistrement de sequences d'images de reference pour eliminer et filtrer des signaux parasites dans des sequences d'images medicales - Google Patents

Procede d'enregistrement de sequences d'images de reference pour eliminer et filtrer des signaux parasites dans des sequences d'images medicales Download PDF

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Publication number
WO1994004977A1
WO1994004977A1 PCT/DE1993/000702 DE9300702W WO9404977A1 WO 1994004977 A1 WO1994004977 A1 WO 1994004977A1 DE 9300702 W DE9300702 W DE 9300702W WO 9404977 A1 WO9404977 A1 WO 9404977A1
Authority
WO
WIPO (PCT)
Prior art keywords
image sequence
image
sequences
filtering
heartbeat
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/DE1993/000702
Other languages
German (de)
English (en)
Inventor
Peter Strobach
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of WO1994004977A1 publication Critical patent/WO1994004977A1/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
    • A61B6/54—Control of apparatus or devices for radiation diagnosis
    • A61B6/541—Control of apparatus or devices for radiation diagnosis involving acquisition triggered by a physiological signal
    • G—PHYSICS
    • G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
    • G16H—HEALTHCARE INFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR THE HANDLING OR PROCESSING OF MEDICAL OR HEALTHCARE DATA
    • G16H30/00—ICT specially adapted for the handling or processing of medical images
    • G16H30/20—ICT specially adapted for the handling or processing of medical images for handling medical images, e.g. DICOM, HL7 or PACS

Definitions

  • noise in X-ray image sequences increases with a decreasing X-ray dose. Therefore, efficient methods for noise filtering are required. They enable a reduction in the dose rate during the examination and thus a reduction in the radiation exposure to the patient and operating personnel.
  • Noise filtering of X-ray image sequences has already been intensively investigated in the literature.
  • the previously known methods for noise filtering are based on the one hand on a motion-compensated averaging of several images over time (TS Huang and YP Hsu, Image Sequence Enhancement, In TS Huang, ed., Image Sequence Analysis, pages 290-310, Springer Verlag, 1981), on non-linear filtering in the single image, or on the method of background extraction with a Kalmann filter (A. v. Brandt and KP Karmann, "A method for the detection and tracking of moving objects in image sequences with a stationary background", US patent 5034986).
  • no specific inistic knowledge of the type of object movements is included in the process approach.
  • the movement of objects of interest eg catheters
  • the image is essentially a result of a synchronous movement of the pulse of the
  • the invention is therefore based on the object of specifying a new method for noise filtering in medical image sequences in which synchronous movement sequences are visible to the heartbeat, which takes into account the sequence of object movements given by the deterministics of the heartbeat.
  • This object is achieved by a method for filtering noise in medical image sequences with movement sequences synchronous with the heartbeat with features according to claim 1.
  • an image sequence is recorded in which a movement sequence synchronous with the heartbeat is visible.
  • An electrocardiogram with R waves is recorded synchronously.
  • the image sequence is segmented according to the R waves of the electrocardiogram using a trigger method.
  • the images of a pulse period of the electrocardiogram are corrected for movement and accumulated in an R-wave synchronized manner in an image sequence reference memory.
  • the method is particularly suitable for use in the noise filtering of X-ray image sequences, in particular when recording the heart.
  • Fig. 1 shows the basic procedure for the execution of the method in a schematic representation.
  • Fig. 2 shows a signal flow diagram of the operations necessary to carry out the method for each picture in the picture sequence. The method is described in more detail below with the aid of a preferred exemplary embodiment and with the aid of the figures.
  • the objects of interest in the image sequence are subject to a rhythmic movement determined by the cardiac activity.
  • an efficient method for noise filtering can be developed.
  • the patient's EKG is recorded in sync with the actual image sequence. It provides information about the phase of the heartbeat associated with each image.
  • the image sequence is segmented according to the R waves of the EKG using a trigger procedure.
  • a motion-corrected and R-wave-synchronous accumulation of the images of a pulse period takes place in an image sequence reference memory.
  • a noise-compensated image sequence with the object movement typical for a heartbeat builds up in this reference memory. This noise-compensated image sequence is again periodically read out with the heartbeat and adapted to the current image sequence.
  • this method can be applied to all medical image sequences in which an object movement synchronous to the heartbeat takes place in the image area.
  • the method is particularly suitable for noise filtering of X-ray image sequences during examinations in the area of the
  • Disturbances in measurement signals separate the useful signal from the interference signal by estimating a sequence of trigger times from an auxiliary signal (blowout and an interference signal template from this measurement signal, in which a trigger-synchronous reference signal is also generated from this interference signal template, and this trigger-synchronous Re
  • the patient's EKG is recorded in sync with the actual image sequence. It provides information about the phase of the heartbeat associated with each image.
  • the image sequence is segmented according to the R waves of the EKG using a trigger procedure.
  • a motion-corrected and R-wave-synchronous accumulation of the images of a pulse period takes place in an image sequence reference memory.
  • a noise-compensated image sequence with the object movement typical for a heartbeat builds up in this reference memory.
  • This noise-compensated image sequence is then periodically read out with the blow and adapted to the current image sequence, which ultimately results in the actual noise-filtered output image sequence.
  • Fig. 1 shows the basic procedure for building the
  • Image sequence reference memory An ECG recorded synchronously to the image sequence is segmented according to the R waves. The images of a segment are entered in an image sequence reference memory. As soon as the next segment limit is reached, the frame counter of the frame sequence reference memory is reset. The images in the next segment are now added motion-compensated to the image content already in the image sequence reference memory.
  • a cumulative image in the image sequence reference memory is adapted by motion compensation to an image of an input image sequence that is segmented in phase with the ECG. Including an exponential forgetting factor, the input image and the movement-compensated cumulative image are now added.
  • the result of this operation is an object-oriented updated cumulative image which is again entered in the image sequence reference memory (which has been updated with it). At the same time, the updated cumulative images arrive at the exit of the method and form the result of the noise-compensated images there.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Medical Informatics (AREA)
  • Pathology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Physics & Mathematics (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Optics & Photonics (AREA)
  • Physiology (AREA)
  • Radiology & Medical Imaging (AREA)
  • Biomedical Technology (AREA)
  • Biophysics (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)

Abstract

Lors de la prise de séquences d'images radiographiques dans la zone du coeur, les objets à observer dans la séquence d'images sont caractérisés par des mouvements rythmiques déterminés par l'activité cardiaque. Selon un procédé efficace de filtrage des interférences dans de telles séquences d'images, on utilise les connaissances préalables relatives aux mouvements répétitifs sensiblement synchroniques avec le pouls du patient. Ce procédé peut en général être mis en oeuvre pour filtrer également les interférences d'autres séquences d'images médicales dans lesquelles des mouvements synchroniques avec les battements du coeur du patient sont détectés.
PCT/DE1993/000702 1992-08-11 1993-08-06 Procede d'enregistrement de sequences d'images de reference pour eliminer et filtrer des signaux parasites dans des sequences d'images medicales Ceased WO1994004977A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4226597.5 1992-08-11
DE4226597 1992-08-11

Publications (1)

Publication Number Publication Date
WO1994004977A1 true WO1994004977A1 (fr) 1994-03-03

Family

ID=6465338

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1993/000702 Ceased WO1994004977A1 (fr) 1992-08-11 1993-08-06 Procede d'enregistrement de sequences d'images de reference pour eliminer et filtrer des signaux parasites dans des sequences d'images medicales

Country Status (1)

Country Link
WO (1) WO1994004977A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0193712A1 (fr) * 1985-02-04 1986-09-10 Siemens Aktiengesellschaft Installation de radiodiagnostic pour angiographie par soustraction
EP0257922A2 (fr) * 1986-08-12 1988-03-02 Kabushiki Kaisha Toshiba Système de balayage dynamique lors de déplacements périodiques
EP0269147A2 (fr) * 1986-10-22 1988-06-01 Philips Electronics North America Corporation Encodeur de signaux cardio-respiratoires groupés dans le temps et méthode pour grouper des signaux cardio-respiratoires

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0193712A1 (fr) * 1985-02-04 1986-09-10 Siemens Aktiengesellschaft Installation de radiodiagnostic pour angiographie par soustraction
EP0257922A2 (fr) * 1986-08-12 1988-03-02 Kabushiki Kaisha Toshiba Système de balayage dynamique lors de déplacements périodiques
EP0269147A2 (fr) * 1986-10-22 1988-06-01 Philips Electronics North America Corporation Encodeur de signaux cardio-respiratoires groupés dans le temps et méthode pour grouper des signaux cardio-respiratoires

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
B.M.EYÜBOGLU ET AL: "METHODS OF CARDIAC GATING APPLIED POTENTIAL TOMOGRAPHY", PROCEEDINGS OF THE 2ND EUROPEAN COMMUNITY WORKSHOP ON ELECTRICAL IMPEDANCE TOMOGRAPHY - APPLIED POTENTIAL TOMOGRAPHY, vol. 9, no. A, 21 October 1987 (1987-10-21), LYON, FR, pages 43 - 48 *
D.E.BOHNING ET AL: "PC-BASED SYSTEM FOR RETROSPECTIVE CARDIAC AND RESPIRATORY GATING OF NMR DATA", MAGNETIC RESONANCE IN MEDICINE, ACADEMIC PRESS INC., vol. 16, no. 2, November 1990 (1990-11-01), pages 303 - 316, XP000175911 *
I.G.ZUBAL ET AL: "DUAL GATED NUCLEAR CARDIAC IMAGES", IEEE TRANSACTIONS ON NUCLEAR SCIENCE, vol. 31, no. 1, February 1984 (1984-02-01), NEW YORK US, pages 566 - 569 *
P. VAN DIJK: "ECG TRIGGERED NMR IMAGING OF THE HEART", DIAGNOSTIC IMAGING IN CLINICAL MEDICINE, vol. 53, no. 1, January 1984 (1984-01-01), SWITZERLAND, pages 29 - 37 *

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