WO2008066437A1 - Agencement et procédé d'imagerie - Google Patents

Agencement et procédé d'imagerie Download PDF

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Publication number
WO2008066437A1
WO2008066437A1 PCT/SE2007/000818 SE2007000818W WO2008066437A1 WO 2008066437 A1 WO2008066437 A1 WO 2008066437A1 SE 2007000818 W SE2007000818 W SE 2007000818W WO 2008066437 A1 WO2008066437 A1 WO 2008066437A1
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WO
WIPO (PCT)
Prior art keywords
radiation
modules
detector
imaging arrangement
imaging
Prior art date
Application number
PCT/SE2007/000818
Other languages
English (en)
Inventor
Tom Francke
Original Assignee
Xcounter Ab
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
Priority claimed from SE0602518A external-priority patent/SE529961C2/sv
Application filed by Xcounter Ab filed Critical Xcounter Ab
Publication of WO2008066437A1 publication Critical patent/WO2008066437A1/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
    • A61B6/48—Diagnostic techniques
    • A61B6/482—Diagnostic techniques involving multiple energy imaging
    • 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
    • A61B6/025—Tomosynthesis
    • 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
    • A61B6/40—Arrangements for generating radiation specially adapted for radiation diagnosis
    • A61B6/4007—Arrangements for generating radiation specially adapted for radiation diagnosis characterised by using a plurality of source units
    • 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
    • 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
    • A61B6/40—Arrangements for generating radiation specially adapted for radiation diagnosis
    • A61B6/4035—Arrangements for generating radiation specially adapted for radiation diagnosis the source being combined with a filter 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
    • A61B6/54—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

Definitions

  • the present invention relates generally to apparatuses and methods for obtaining time resolved imaging data of an object.
  • Angiography is a radiological method for examination of blood or lymph vessels. Blood has the same radiodensity as the surrounding tissues and a radiocontrast agent (which absorbs X-rays) is therefore added to the blood to make angiography visualization possible.
  • a catheter is inserted into the vessel, e.g. by Seldinger technique, and a water soluble contrast agent is injected into the vessel, after which a series of X-ray images of the vessel is taken.
  • Examinations of arteries, veins and lymph vessels are denoted arteriography, flebography and lymphography, respectively.
  • Arteriography is a commonly applied examination method and includes angiocardiography for examination of the heart, coronary angiography for examination of the coronary arteries of the heart and aortography for examination of the aorta.
  • the X-ray images may be taken as either still images displayed on a fluoroscope, or may be taken as motion images.
  • Fluoroscopy requires high concentrations of contrast agents, for example iodinated contrast agents . Fluoroscopy involves the use of ionizing radiation and all fluoroscopic procedures therefore pose a potential health risk to the patient. Radiation doses that the patient is exposed to depend greatly on the size of the patient as well as length of the procedure and exposure times vary depending on the procedure being performed.
  • an imaging arrangement for obtaining imaging data of an object.
  • the imaging arrangement comprises a support structure having an axis of rotation and comprising means for rotating the support structure; a pair of first and second radiation modules fixedly arranged on the support structure along a radius perpendicular to the axis of rotation, wherein each of the radiation modules comprises a radiation source simultaneously emitting radiation; a radiation detector for detecting radiation as emitted from the radiation modules and passed through the object being imaged, wherein the radiation detector comprises a number of direction sensitive line detectors, each being directed towards either one of the two radiation sources in order to allow a ray bundle of radiation to enter the line detector; and a collimator arranged between, as seen in a direction parallel to the axis of rotation, the pair of radiation modules and the radiation detector.
  • the invention provides an improved contrast resolution, whereby the amount of iodinated contrast agent can be minimized and health hazards for the patient can be reduced substantially.
  • each of the direction sensitive line detectors is adapted to record a plurality of line images of radiation as transmitted through the object from the pair of radiation modules. Further, every second line detector may be arranged to record radiation from the first radiation module and every second line detector may be arranged to record radiation from the second radiation module. Simultaneous recording of data from the two radiation sources is enabled resulting in an increased three-dimensional resolution, shorter acquisition time and increased contrast resolution.
  • each pair has an associated collimator and radiation detector.
  • the radiation detector of each pair is then arranged to consecutively image the object during a revolution of the imaging arrangement.
  • the imaging arrangement may then be rotated at a lower speed or several different phases of the heartbeat may be recorded in a single rotation of the imaging arrangement .
  • the radiation sources of the radiation modules are arranged to emit radiation of different energies.
  • the first radiation source may be arranged to emit radiation of an energy above 100 kV and the second radiation source may be arranged to emit radiation of an energy below 100 kV.
  • An increased contrast resolution is thereby obtained, and a contrast agent inserted into the patient can be seen more clearly providing an improved detection of e.g. atherosclerosis (hardening of the arteries) in the patient's blood vessels.
  • the first radiation module is arranged in a non-rotating fashion at a point along the axis of rotation.
  • a flexible solution is thereby provided, wherein the imaging arrangement can be adapted to the particular use. Further, the cost of the imaging arrangement is also reduced.
  • the object being imaged is a heart
  • the imaging arrangement is thus used for angiocardiography.
  • the imaging arrangement is very suitable for providing images of a heart.
  • the invention also relates to a method for obtaining imaging data of an object, whereby advantages similar to the above are achieved.
  • FIG 1 illustrates schematically an imaging arrangement in accordance with the present invention.
  • Figure 2 illustrates the radiation detector of the imaging arrangement of figure 1.
  • FIG. 3 illustrates schematically the imaging procedure in accordance with the present invention.
  • Figure 4 illustrates, in a front view, an embodiment of the imaging arrangement in accordance with the present invention.
  • Figure 5 illustrates another embodiment of the imaging arrangement in accordance with the present invention.
  • Figure 6 illustrates a flow chart of steps included in a method in accordance with the present invention.
  • FIG. 1 illustrates schematically the basic components of the 5 present invention.
  • An imaging arrangement 1 in accordance with the invention comprises one or more pairs of radiation modules 2a, 2b arranged on a support arm 3a of a support structure 3.
  • the imaging arrangement 1 further comprises a radiation detector 4 arranged on the support structure 3 beneath a .0 patient positioning table, in the following denoted object table 5.
  • the radiation detector 4 and the radiation modules 2a, 2b are arranged on opposite sides of the patient positioning table 5 so as to enable the radiation detector 4 to detect radiation emitted from the radiation modules 2a, 2b .5 and passed through a patient 7 or other object that is being imaged.
  • the radiation modules 2a, 2b, the collimator 14 and the radiation detector 4 are rigidly connected to each other by means of the support structure 3, 3a.
  • the radiation modules 2a, 2b comprise a radiation source
  • Each X-ray source 6a, 6b preferably comprises a cathode, which emits electrons and an anode, which emits X- rays in response to being struck by the electrons.
  • the X-ray source 6a, 6b is provided for emitting radiation of a suitable
  • 2a, 2b may be arranged to emit radiation of different energies, as described more in detail later on.
  • the radiation module 2a, 2b further comprises a filter arrangement 8a, 8b.
  • the filter arrangement 8a, 8b is placed
  • the filter arrangements 8a, 8b of the two radiation modules 2a, 2b may have different filter sections in front of the different X-ray sources 6a, 6b so that different radiation from the different X-ray sources 6a, 6b may be filtered differently.
  • the imaging arrangement 1 further comprises a collimator 14, which is also arranged on the support device 3.
  • a collimator 14 which is also arranged on the support device 3.
  • the collimator 14 may be a thin foil of e.g. tungsten with narrow radiation transparent slits.
  • the slits are aligned with corresponding line-shaped sensitive areas or entrance slits of the radiation detector 4 so that X- ray bundles passing through the slits of the collimator 14 will reach the sensitive areas of the radiation detector 4.
  • the radiation detector 4 comprises a plurality of direction sensitive line detectors as is illustrated and described more in detail later on with reference to figure 2.
  • the support structure 3 may be any suitable support device to which the radiation modules 2a, 2b, the collimator 14 and the radiation detector 4 can be attached.
  • the support structure 3 has an axis 9 of rotation as indicated in the figure.
  • the object table 5 is preferably not supported by the support structure 3, but by another support structure (not illustrated) .
  • a device for rotating the support structure 3 around the axis 9 of rotation relative to the object table 5.
  • the radiation modules 2a, 2b, the collimator 14 and the radiation detector 4 are arranged above one another and rotate together around the axis 9 of rotation relative to the object table 5; that is, are moved in a common rotational movement relative to the object to be examined.
  • the object table 5 is arranged in the radiation path between the divergent radiation modules 2a, 2b and the radiation detector 4 during a short duration of a revolution of the support structure 3.
  • each of the line detectors of the radiation detector 4 is adapted to record a plurality of line images of radiation as transmitted through the object in a respective one of different angles.
  • the radiation module 2a, 2b is preferably active only when needed. That is, the X-ray radiation source 6a, 6b of the radiation module 2a, 2b only has to be switched on during the time it is scanned across the object table 5 and thus has to produce radiation for the measurement.
  • the imaging arrangement 1 further comprises a microprocessor or computer provided with suitable software for controlling the arrangement and readout and post-processing of the data recorded by the line detectors 16. Further, a power supply is included for supplying the detector and the microprocessor or computer with power and for driving a step motor or similar for driving the imaging arrangement 1 and the device 10 for rotating it. Further, image processing means is provided for calculating a three dimensional reconstruction of the object 7 based on tomosynthesis data provided from the line detectors.
  • the radiation detector 4 is arranged to simultaneously record radiation emitted from the pair of radiation modules 2a, 2b.
  • FIG. 2 illustrates the radiation detector 4 , which comprises a number of direction sensitive line detectors 16.
  • Each line detector 16 extends in the y-direction in order to record one- dimensional images in the y-direction.
  • Each of the line detectors 16 is preferably a gaseous-based ionization detector, wherein electrons freed as a result of ionization by 5 ionizing radiation entered into the line detector are accelerated, and optionally avalanche amplified, in a direction essentially perpendicular to the direction of the entered ionizing radiation.
  • Such line detector is referred to as a gaseous-based edge-on detector.
  • Each of the line detectors 16 may alternatively be any of a scintillator-based detector, a PIN-diode array, a TFT array, a CCD array, a gaseous-based detector, a liquid-based detector, !0 a solid-state detector or a CMOS detector.
  • the line detectors 16 in the array are alternatively pointing towards different ones of the two radiation modules 2a and 2b.
  • every second line detector is pointing towards the X-ray source 6a and every 15 second line detector is pointing towards the X-ray source 6b.
  • small groups of line detectors may be pointing towards the respective X-ray sources 6a, 6b, e.g. groups of 2, 3 or 4 line detectors are pointing towards X-ray sources 6a, 6b, respectively.
  • the direction sensitivity of the line detectors 16 implies that each of them measures only radiation from the radiation source 6a, 6b, to which it is directed.
  • the opening angle of each line detector 16 in the x direction may be as low as 0.1 degrees .
  • line detectors 16 are gaseous-based edge-on detectors
  • each of them comprises readout strips that are essentially pointing towards either one of the radiation sources 6a, 6b.
  • each line detector 16 is arranged in a fan-like structure, wherein the extension lines of the readout strips converge in either one of the
  • FIG 3 illustrates schematically the imaging procedure utilizing the imaging arrangement 1 described above.
  • the radiation emitted from the radiation modules 2a, 2b are shown schematically at 17a and 17b.
  • the radiation modules 2a, 2b are shown schematically at 17a and 17b.
  • the sheet of radiation is shown only for one pair of line detectors, each pointing towards one of the radiation modules. Imaging data is obtained at high repetition rates for X-ray examination of the patient. During the rotation of the support structure 3 and thus rotation of the pair of radiation modules
  • each of the line detectors 16 of the radiation detector 4 is adapted to record a plurality of line images of radiation as transmitted through the patient in a respective one of different angles.
  • FIG. 4 illustrates an embodiment of the invention.
  • ',5 imaging arrangement 1 comprises the above-described support structure 3, including the radiation modules 2a, 2b, collimator 14 and radiation detector 4.
  • the innermost radiation module 2a is preferably arranged close to the axis of rotation 9.
  • the outermost radiation module 2b is arranged
  • the rotational speed of the imaging arrangement 1 is synchronized with an electrocardiogram (ECG) examination of the patient.
  • ECG electrocardiogram
  • the radiation detector 4 can thereby be arranged so as to be in the particular phase of the heart beat of interest, during which data is to be gathered. If data is to be gathered during several heart beats, then the rotational speed is adjusted in accordance with the number of heart beats . For example, if the measurements are to be performed for two consecutive heart beats with a rotational speed of about one revolution per heart beat, then the first (outermost) line detector in the radiation detector 4 is aligned so as to be 5 under a particular part of the heart. If the radiation detector 4 has 80 line detectors, then the first 40 is used during the first revolution and thus first heart beat and data is gathered. During the next revolution (the next heart beat) the 41 st line detector should be aligned at the same part and 10 data is again gathered. This thus implies that the rotational speed of the imaging arrangement 1 should be slightly higher that the heart rate
  • the two radiation sources 6a, 6b can be arranged to emit radiation of different energies.
  • One of the radiation sources 6a, 6b can be arranged to emit radiation of different energies.
  • the 15 6a can have a hard X-ray spectrum (e.g. > 100 kV) and the other radiation source 6b can have a soft X-ray spectrum (e.g. ⁇ 100 kV) .
  • a hard spectrum is typically obtained by providing a high acceleration voltage on the radiation source and possibly filtering low-energetic X-rays by means of a filter.
  • a soft spectrum is typically obtained by means of low acceleration voltages, for example 60-80 kV or even lower and possibly by filtering high-energetic X-rays by means of a filter.
  • the radiation sources 6a, 6b may be arranged to emit radiation of equal energy.
  • An iodinated contrast agent absorbs low-energetic radiation to a greater extent than do tissue and blood, while high- energetic radiation is absorbed to a substantially equal extent of the contrast agent, tissue and blood.
  • the iodide will become i0 visible.
  • By adding the images a regular X-ray image of the heart is obtained.
  • An increased resolution is obtained by such dual energy- imaging, and a contrast agent inserted into the patient can be seen more clearly.
  • An improved detection of e.g. atherosclerosis in the patient's blood vessels (that is, hardening of the arteries) is thereby provided.
  • Figure 5 illustrates another embodiment of the invention.
  • the support structure 3 comprises several pairs of radiation modules 2a, 2b and one radiation detector 4 associated with each pair of radiation modules 2a, 2b.
  • Each arrangement of one pair of radiation modules 2a, 2b and their associated radiation detector 4 and collimator 14 is in the following denoted imaging device.
  • the imaging device When the support structure 3 rotates around the axis 9 of rotation relative to the object table 5, the object table 5 will successively be arranged in the radiation path between the radiation modules and radiation detectors of the imaging devices.
  • each of the imaging devices is adapted to record a plurality of line images of radiation as transmitted through the object in a respective one of different angles.
  • An advantage of this embodiment is that it is possible to take images of the heart in several of its phases simultaneously, or to use a lower rotational speed of the imaging arrangement 1 for providing images of the same heart phase.
  • the radiation sources 6a, ⁇ b of the imaging devices are preferably active in consecutive order.
  • the two X-ray sources 6a, 6b of a particular imaging device thus only need to be switched on during the time it is scanned across the object table 5 that is, when they have to produce radiation for the measurement.
  • one of the two radiation modules 2a, 2b is fixedly arranged close to the axis of rotation 9.
  • the embodiment of figure 4 or 5 is thus modified in that the inner one of the radiation modules 2a, 2b does not rotate.
  • This fixedly arranged radiation module 2a is consecutively paired with each of the 5 radiation modules 2b arranged at the outer part of the support arm 3a on which the radiation modules 2b are arranged. That is, the fixedly arranged radiation module 2a is used as the second X-ray source 6a for each of the one or more imaging devices.
  • the fixedly arranged radiation module 2a is arranged 0 to emit radiation simultaneously with each of the outer radiation sources 2b.
  • the catheter used to administer the contrast agent at the area to be imaged is usually threaded into an artery in the groin of the patient and the 5 tip is advanced through the arterial system into the area being imaged, e.g. the heart.
  • large amounts of contrast agent containing iodide is inserted.
  • the contrast agent also has a high concentration of iodide.
  • the present invention provides an improved contrast resolution, that is, the ability of the fluoroscopy to distinguish between various contrasts of the acquired image. By means of the increased contrast resolution the threading of the catheter into the groin can be avoided. Instead, the
  • contrast agent may be injected in the forearm. This is a known procedure; the concentration of the contrast agent in the heart is decreased, but this also means that it is more difficult to obtain images of high quality.
  • the imaging arrangement in accordance with the invention provides high-quality images, and enables the medical examiner to see how the contrast agent disperses in the blood and onwards to the heart. It is, for example, possible to see whether some parts of the heart obtains less or none contrast agent, which would indicate a impaired flow of blood in the cardiovascular system. All this can, in accordance with the invention, be imaged three-dimensionally with high resolution.
  • the three-dimensional images have high spatial resolution in all three dimensions, since the radiation detector used have small pixel sizes.
  • prior art imaging systems such as fluoroscopy, have pixel sizes in the range of 200-600 ⁇ m, which can be compared with the present imaging arrangement having pixel sizes of about 100 ⁇ m.
  • the high resolution provided is also owing to the fact that the images of the patient is taken in many angles .
  • the present invention provides high time resolution in which the resolution is not affected by the heart's motion. This is achieved by the innovative imaging arrangement, in which the radiation detector passes under the heart during a short duration of the heart beat cycle.
  • the arrangement of the present invention can be used as part of routine physical examinations. That is, three-dimensional images of for example the heart can be taken in preventive purpose, that is, tests performed on patients without any clinical indication of disease (so-called screening). High-quality images of internal organs can be obtained without posing the patient to health risks.
  • the invention is also related to a method for obtaining imaging data of an object using the imaging arrangement 1 as described above.
  • the method comprises the steps of: arranging, in step 110, the object 7 in the radiation path between the radiation sources 6a, 6b and the radiation detector 4, and rotating, in step 120, the support structure 3 around its axis of rotation 9 relative the object 7.
  • the step of rotating the support structure 3 may comprise the further step of adapting the rotational speed in dependence on the heart rate and/or the number of heart beats being imaged in a manner previously described.
  • dual energy imaging is also enabled, for example a dual energy angiography or dual energy angiocardiography.

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

Abstract

L'invention concerne un agencement d'imagerie 1 permettant d'obtenir des données d'imagerie d'un objet 7. L'agencement d'imagerie 1 comprend une structure de support 3 ayant un axe de rotation 9, et comprenant des moyens 10 pour tourner la structure de support 3 ; une paire de premier et second modules de rayonnement 2a, 2b agencés fermement sur la structure de support 3 le long d'un rayon perpendiculaire à l'axe de rotation 9, chacun des modules de rayonnement 2a, 2b comprenant une source de rayonnement 6a, 6b émettant simultanément un rayonnement ; un détecteur de rayonnement 4 pour détecter un rayonnement émis par les modules de rayonnement 2a, 2b et passé à travers l'objet 7 imagé ; et un collimateur 14 agencé, lorsqu'on regarde dans une direction parallèle à l'axe de rotation 9, entre la paire de modules de rayonnement 2a, 2b et le détecteur de rayonnement 4. L'invention concerne également un procédé correspondant.
PCT/SE2007/000818 2006-11-27 2007-09-18 Agencement et procédé d'imagerie WO2008066437A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0602518A SE529961C2 (sv) 2006-03-21 2006-11-27 Avbildningsanordning och metod för att erhålla tidsupplöst avbildningsdata av ett objekt
SE0602518-3 2006-11-27

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WO2008066437A1 true WO2008066437A1 (fr) 2008-06-05

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PCT/SE2007/000818 WO2008066437A1 (fr) 2006-11-27 2007-09-18 Agencement et procédé d'imagerie

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4349740A (en) * 1976-12-23 1982-09-14 Siemens Aktiengesellschaft Apparatus for displaying fluoroscopic tomographic images of the body
DE3931531A1 (de) * 1988-10-03 1990-04-05 Siemens Ag Medizinische diagnostikanlage mit zwei unterschiedlichen bildgebenden systemen
US20050067570A1 (en) * 2003-09-05 2005-03-31 Retterath James E. System for automated detection of embedded objects
WO2005119297A2 (fr) * 2004-05-27 2005-12-15 L-3 Communications Security And Detection Systems, Inc. Systemes de detection de contrebande faisant appel a un systeme de tomodensitometrie a faisceau conique grand angle

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4349740A (en) * 1976-12-23 1982-09-14 Siemens Aktiengesellschaft Apparatus for displaying fluoroscopic tomographic images of the body
DE3931531A1 (de) * 1988-10-03 1990-04-05 Siemens Ag Medizinische diagnostikanlage mit zwei unterschiedlichen bildgebenden systemen
US20050067570A1 (en) * 2003-09-05 2005-03-31 Retterath James E. System for automated detection of embedded objects
WO2005119297A2 (fr) * 2004-05-27 2005-12-15 L-3 Communications Security And Detection Systems, Inc. Systemes de detection de contrebande faisant appel a un systeme de tomodensitometrie a faisceau conique grand angle

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