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EP0765135A1 - Procede de radioprotection en radiodiagnostic - Google Patents
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EP0765135A1 - Procede de radioprotection en radiodiagnostic - Google Patents

Procede de radioprotection en radiodiagnostic

Info

Publication number
EP0765135A1
EP0765135A1 EP95919311A EP95919311A EP0765135A1 EP 0765135 A1 EP0765135 A1 EP 0765135A1 EP 95919311 A EP95919311 A EP 95919311A EP 95919311 A EP95919311 A EP 95919311A EP 0765135 A1 EP0765135 A1 EP 0765135A1
Authority
EP
European Patent Office
Prior art keywords
sensor
measuring device
body fluids
hemoglobin
circuit according
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.)
Withdrawn
Application number
EP95919311A
Other languages
German (de)
English (en)
Inventor
Werner Prof.Dr. Krause
Uwe Krüger
Peter Dr. Muschick
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.)
Bayer Pharma AG
Original Assignee
Schering AG
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 Schering AG filed Critical Schering AG
Publication of EP0765135A1 publication Critical patent/EP0765135A1/fr
Withdrawn legal-status Critical Current

Links

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
    • A61B6/48—Diagnostic techniques
    • A61B6/481—Diagnostic techniques involving the use of contrast agents
    • 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
    • A61B6/504—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 diagnosis of blood vessels, e.g. by angiography

Definitions

  • the invention relates to the subject matter characterized in the claims, i.e. a method for avoiding radiation damage in the X-ray diagnosis and a device for performing this method.
  • the diagnostic system described there has the disadvantage that the contrast medium bolus is measured either by a radioisotope source, which in turn contributes to the radiation exposure of the patient, or on the other hand by admixing an optically detectable dye, which in turn increases the exposure of the patient to foreign substances.
  • the method according to the invention consists in that the natural components of the blood or lymphatic system are measured by means of a sensor.
  • the contrast agent bolus arrives in the tissue to be examined, the natural body fluid is displaced (diluted) by the arrival of the contrast agents.
  • the Changes in the physical properties of body fluids can be measured and provide the necessary signal to trigger the X-ray device.
  • the concentration of the blood pigment hemoglobin is measured, for example by transmission or reflection spectroscopy. If the value falls below an adjustable setpoint, the X-ray source is triggered.
  • the method according to the invention has the advantage that the arrival time of the contrast medium bolus in a certain tissue part can be exactly determined without additional radiation or foreign substance pollution.
  • a preferred method is one in which the sensor is a measuring device for determining the concentration of blood components.
  • a method is particularly preferred in which the concentration of the hemoglobin is determined by transmission or reflection spectroscopy.
  • the light sensor of a device e.g. Multiscan OS 10 or OS 15
  • the hemoglobin concentration decreases briefly and thereby generates a signal that can be determined by the sensor.
  • This signal is processed by the setpoint switch. If the signal is sufficient, the pulse generator activates the radiation source.
  • the contrast medium bolus has flowed through the examination area, the sensor detects an increase in the hemoglobin concentration.
  • the radiation source is switched off after a setpoint is exceeded.
  • the senor is a flow meter. Since the media often have a different viscosity than the blood, there is a change in the flow velocity, which can be determined in this way. Furthermore, some media have a different inductance than the blood, so that a reliable localization of the medium can be ensured even with the same viscosity of the medium and body fluid. In addition, it is also possible to measure the displacement of the body fluids sonographically (including Doppler sonography). The method according to the invention is carried out by means of the device described below and shown in FIG.
  • the circuit (100) consists of a radiation source (1) with a radiation window (2).
  • a detector (3) which displays an image on a monitor (4), is arranged opposite the radiation window. There is a between the X-ray apparatus and the detector
  • a sensor (6) is expediently placed on the patient's skin proximally from the diagnostic area. This sensor measures the hemoglobin concentration in the blood.
  • the sensor is coupled to a setpoint switch (7), which registers the change in the concentration of hemoglobin in the upper arm. If a threshold value is undershot, a pulse generator (8) is activated which switches on the X-ray source. When the hemoglobin concentration increases again, this is also registered by the sensor (6) which, after adjustment with the setpoint switch (7), causes the pulse generator (8) to switch off the X-ray source again.
  • the necessary sensor (6) is, for example, a measuring device for determining the flow rate or the inductance of body fluids.
  • the sensor is preferably a transmission or reflection spectrometer.
  • a sonographic sensor in particular a measuring head, which is suitable for Doppler sonography.
  • the invention therefore also relates to a device for carrying out the method according to the invention.

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Medical Informatics (AREA)
  • Engineering & Computer Science (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • Biophysics (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Optics & Photonics (AREA)
  • Pathology (AREA)
  • Radiology & Medical Imaging (AREA)
  • Biomedical Technology (AREA)
  • Physics & Mathematics (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • High Energy & Nuclear Physics (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Vascular Medicine (AREA)
  • Dentistry (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Apparatus For Radiation Diagnosis (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)

Abstract

L'invention concerne un procédé et un dispositif de radioprotection en radiodiagnostic par mesure des changements de la concentration de substances propres au corps dans les liquides organiques.
EP95919311A 1994-05-13 1995-05-12 Procede de radioprotection en radiodiagnostic Withdrawn EP0765135A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4417287 1994-05-13
DE4417287 1994-05-13
PCT/DE1995/000649 WO1995031134A1 (fr) 1994-05-13 1995-05-12 Procede de radioprotection en radiodiagnostic

Publications (1)

Publication Number Publication Date
EP0765135A1 true EP0765135A1 (fr) 1997-04-02

Family

ID=6518309

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95919311A Withdrawn EP0765135A1 (fr) 1994-05-13 1995-05-12 Procede de radioprotection en radiodiagnostic

Country Status (5)

Country Link
US (1) US5896439A (fr)
EP (1) EP0765135A1 (fr)
JP (1) JPH09512444A (fr)
NO (1) NO964795D0 (fr)
WO (1) WO1995031134A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6597938B2 (en) 2001-08-16 2003-07-22 Koninklijke Philips Electronics, N.V. System for assistance of parameter determination and diagnosis in MRI dynamic uptake studies
US6637936B2 (en) * 2001-11-15 2003-10-28 Ge Medical Systems Global Technology Bolus tracking x-ray positioner
DE102011080364B4 (de) * 2011-08-03 2021-03-18 Siemens Healthcare Gmbh Kontrastmittel-verstärkte Bildgebung bei der Strahlentherapie

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1125560B (de) * 1959-12-31 1962-03-15 Dr Dr Emil Heinz Graul Verfahren und Anordnung zum Herstellen von Roentgenaufnahmen unter Verwendung eines in die Blutgefaesse injizierten Kontrastmittels
DE3203594A1 (de) * 1982-02-03 1983-08-11 Siemens AG, 1000 Berlin und 8000 München Roentgendiagnostikanlage fuer angiographische roentgenaufnahmen
JPS59214431A (ja) * 1983-05-20 1984-12-04 株式会社東芝 放射線診断装置
DE3431538A1 (de) * 1984-08-28 1986-03-06 Stb Strahlentechnische Bilddiagnostik Heinz Fleck, 2080 Pinneberg Vorrichtung zum ermitteln des zeitabstandes zwischen intravenoes-er oder -arterieller injektion einer radioaktiv markierten fluessigkeit, insbesondere eines roentgenkontrastmittels und erreichen der zu roentgenden stelle des patienten und fluessiges roentgenkontrastmittel selbst
JPH0822025B2 (ja) * 1985-02-25 1996-03-04 株式会社日立製作所 画像入力装置
FR2664153B1 (fr) * 1990-07-06 1992-09-11 Gen Electric Cgr Systeme de radiodiagnostic pour examen angiographique avec dispositif automatique de suivi d'embole.
JP3260472B2 (ja) * 1993-03-26 2002-02-25 浜松ホトニクス株式会社 診断装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9531134A1 *

Also Published As

Publication number Publication date
NO964795L (no) 1996-05-12
NO964795D0 (no) 1996-11-12
JPH09512444A (ja) 1997-12-16
US5896439A (en) 1999-04-20
WO1995031134A1 (fr) 1995-11-23

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Legal Events

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