WO2004021245A2 - Verfahren und anordnung sowie computerprogramm mit programmcode-mitteln und computerprogramm-produkt zur analyse von neuronalen aktivitäten in neuronalen arealen - Google Patents
Verfahren und anordnung sowie computerprogramm mit programmcode-mitteln und computerprogramm-produkt zur analyse von neuronalen aktivitäten in neuronalen arealen Download PDFInfo
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- WO2004021245A2 WO2004021245A2 PCT/DE2003/002658 DE0302658W WO2004021245A2 WO 2004021245 A2 WO2004021245 A2 WO 2004021245A2 DE 0302658 W DE0302658 W DE 0302658W WO 2004021245 A2 WO2004021245 A2 WO 2004021245A2
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- signals
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- 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
- G16H50/00—ICT specially adapted for medical diagnosis, medical simulation or medical data mining; ICT specially adapted for detecting, monitoring or modelling epidemics or pandemics
- G16H50/50—ICT specially adapted for medical diagnosis, medical simulation or medical data mining; ICT specially adapted for detecting, monitoring or modelling epidemics or pandemics for simulation or modelling of medical disorders
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- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
- G16Z—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS, NOT OTHERWISE PROVIDED FOR
- G16Z99/00—Subject matter not provided for in other main groups of this subclass
Definitions
- the invention relates to an analysis of neuronal activities in neuronal areas, for example of nerve structures in the brain areas of a patient.
- the previously known magnetic resonance imaging (also magnetic resonance imaging, abbreviated: MR) is an imaging method that generates sectional images of the human body without the use of stressful X-rays.
- the MR makes use of the behavior of the body tissue in a strong magnetic field. Pathological changes in the body tissue, for example in the brain or spinal cord, can be identified.
- BOLD signal Blood
- Oxygenation Level Dependent in individual areas of the brain, which is related to the neuronal activity in the respective areas.
- the result of the fMRI measurements shows the course of the activity of the individual areas over a certain period of time, for example during cognitive processes as a result of certain perceptual processes or motor tasks.
- Previously known methods such as the analysis method known from [6] are limited to the detection of functional relationships between different brain areas in certain, predetermined tasks, such as perceived processes or motor tasks (functional connectivity). These functional relationships are referred to as functional connectivity.
- functional connectivity In contrast to functional connectivity, the determination of a true physical connectivity, ie the determination of actually existing connection structures (of brain areas) independently of certain, predetermined tasks, is not possible with these known methods.
- the aim of this known and subsequently described analysis method is the above-described recognition of functional relationships between different brain areas in certain perception processes or motor tasks.
- This known analysis method is based on a predefined model of a brain, i.e. a predefined brain architecture.
- This brain architecture predefined from a priori, defines a priori general functional and / or spatial dependencies between certain brain areas in the form of a so-called coupling matrix S.
- the coupling matrix S has a (column / row) shape or structure defined according to the given brain architecture and is accordingly occupied at certain, but not at all (matrix) locations with so-called, variable coupling strengths Si. This can be changed and are adjusted as part of the analysis process.
- the vacant (matrix) positions are filled with fixed, unchangeable values, namely zero.
- Coupling strengths Si a probability of the measured data occurring, i.e. the fMRI measurement or the BOLD signals can be maximized.
- the fMRI measurement comprises a large number of such data points for possibly different perception processes and / or motor tasks for which the corresponding BOLD signals were measured.
- the individual data points sl, s2, ..., sT are not evaluated directly, but rather statistical parameters which result from these.
- the unknown quantities, the mean ⁇ and the covariance ⁇ depend exclusively on a (brain) model that describes the measurement data.
- ⁇ Ss + ⁇ (3)
- ⁇ describes the external influence on the individual BOLD signals, such as sensory input from sensory cells on the examined areas of the brain.
- the influencing variables ⁇ i and ⁇ j on various examined areas i and j can certainly be correlated.
- the model parameters to be determined are accordingly the coupling strengths Si of the underlying coupling matrix S, the mean value ⁇ of the external influence ⁇ and the covariance ⁇ of ⁇ .
- the known analysis method described in the above has the disadvantage that the measured fMRI signals can only be explained inadequately accurately or that the model can only be inadequately adapted to the measured fMRI signals and thus the functioning or the interaction of neural ones Areas can only be insufficiently replicated. This deficiency may lead to incorrect conclusions regarding the connectivity functionality.
- a software tool for an fMRI analysis method is known from [4].
- a device for carrying out the fMRI technique is known from [5].
- the invention is therefore based on the object of specifying an improved analysis method for analyzing neuronal activities.
- the improved analytical method is intended to explain measured fMRI signals better and thus to better describe the functioning and interaction of neuronal areas than in the known analytical method described above.
- This object is achieved by the method and the arrangement as well as by the computer program with program code means and the computer program product for analyzing neural activities in neuronal areas with the features according to the respective independent patent claim.
- the signals are determined, each signal describing the neural activity in one of the neuronal areas.
- Probabilities for the occurrence of the signals are determined, the occurrence of the signals being based on a statistical distribution.
- the neural activities are analyzed using the adjustable coupling sizes
- the arrangement for analyzing neural activities in neural areas using signals describing the neural activities has functional ones units in contact with one another, which are set up in such a way that
- the signals can be determined, one signal each describing the neuronal activity in one of the neuronal areas,
- All signals can be based on an adaptable coupling, which is described using adaptable coupling variables that describe a statistical relationship between the adaptably coupled signals.
- Probabilities for the occurrence of the signals can be determined, the occurrence of the signals being based on a statistical distribution
- the neural activities can be analyzed using the adjustable coupling sizes.
- the invention thus differs from the known analysis method described above in that in the known analysis method only a part of the signals are based on adaptable statistical coupling. Only these can be determined by optimizing the probabilities and thus adapted. Seen clearly, the known analysis method thus sets a known, predetermined and defined neuronal
- both the most likely coupling structure on the basis of the signals is determined and a coupling strength of the specific couplings.
- the computer program according to the invention with program code means is set up to carry out all steps according to the analysis method according to the invention when the program is executed on a computer.
- the computer program product with program code means stored on a machine-readable carrier is set up to carry out all steps according to the analysis method according to the invention when the program is executed on a computer.
- the arrangement and the computer program with program code means, set up to carry out all steps according to the inventive analysis method when the program is executed on a computer, and the computer program product with program code means stored on a machine-readable medium, set up all steps according to the Carrying out analysis methods according to the invention when the program is executed on a computer are particularly suitable for carrying out the analysis method according to the invention or one of its further developments explained below.
- Training can be realized by a computer program product which has a storage medium on which the
- Computer program with program code means is stored, which carries out the invention or further development.
- the statistical distribution on which the occurrence of the signals is based can be of first order as well as higher order.
- the higher order can be realized using an Edgeworth expansion [2] or a sum of normal distributions.
- the individual normal distributions and thus indirectly the neuronal activities can be weighted in the sum of normal distributions.
- the optimization can also be carried out using a method of maximum likelihood estimation [1].
- a relationship between the linear statistical relationship and the statistical distribution can be considered as a secondary condition.
- external influences on the signals can be, for example, sensory inputs from sensory cells to the areas examined.
- the signals in the invention for example BOLD signals, can be determined by measuring signals or by transmitting and / or reading in already existing signals.
- the invention and further development described are particularly suitable for use with an fMRI technique, which is considerably improved and more efficient as a result.
- the neuronal areas are brain areas with corresponding nerve structures of patients to be examined and diagnosed.
- BOLD signals are measured in different brain areas of a patient for defined perception or motor tasks performed by the patient, which BOLD signals describe or represent the neuronal activities in the respective brain areas. These are evaluated or analyzed, the signal coupling quantities being determined. Using the analysis results, especially the
- Signal coupling quantities, functional as well as physical dependencies between brain areas can be recognized and determined. These can be used further for a diagnosis of a functional disorder in a patient's brain area, for example by
- FIG. 1 device for carrying out an fMRI according to an exemplary embodiment
- FIG. 1 sketch with method steps in an analysis of BOLD signals according to an embodiment.
- Exemplary embodiment functional magnetic resonance imaging (fMRI)
- FIG. 1 shows a device 100 for performing a functional magnetic resonance imaging
- Magnetic resonance imaging short: fMRI
- a functional magnetic resonance scanner or magnetic resonance imaging scanner 100 Magnetic resonance imaging (short: fMRI), a functional magnetic resonance scanner or magnetic resonance imaging scanner 100.
- the magnetic resonance tomograph .100 has a closed tube 110, which is embedded in a magnet 120 such that it generates a strong magnetic field in the tube 110.
- the magnetic resonance tomograph 100 has a patient table 130 which can be moved into the tube 110 and on which a patient is supported during an examination.
- the magnetic resonance tomograph 100 has a control device 131, which controls and
- Control of the patient table 130 during the examination for example a controlled insertion of the patient table 130 into the tube 120, is made possible.
- the magnetic resonance tomograph 100 has a measuring device 140 for measuring BOLD signals (Blood Oxygenation Level Dependent), an associated evaluation device 141 for evaluating the measured BOLD signals, in this case a high-performance computer, and an operating or interaction device 142 for on BOLD signals (Blood Oxygenation Level Dependent), an associated evaluation device 141 for evaluating the measured BOLD signals, in this case a high-performance computer, and an operating or interaction device 142 for on BOLD signals (Blood Oxygenation Level Dependent), an associated evaluation device 141 for evaluating the measured BOLD signals, in this case a high-performance computer, and an operating or interaction device 142 for on BOLD signals (Blood Oxygenation Level Dependent), an associated evaluation device 141 for evaluating the measured BOLD signals, in this case a high-performance computer, and an operating or interaction device 142 for on BOLD signals (Blood Oxygenation Level Dependent), an associated evaluation device 141 for evaluating the measured BOLD signals
- the components of the magnetic resonance tomograph 100 are functionally connected to one another, for example via signal or
- Data lines 150 via which data and signals can be transmitted.
- the neuronal activity in areas of the brain of a patient can be measured, analyzed and a diagnosis can be derived therefrom on the basis of the fMRI technique.
- the measuring device 140 measures the BOLD signal (Blood Oxygenation Level Dependent) in individual, selected areas of the patient's brain, which is related to the neuronal activity in the respective area.
- the result of such fMRI measurements shows the course of the activity of the individual areas over a certain period of time, for example during cognitive processes as a result of certain perceptual processes or motor tasks which are to be carried out by the patient during an examination.
- the fMRI measurements i.e. the BOLD signals measured in individual areas of the brain are analyzed.
- This new analysis method represents an improved further development of the known analysis method described in the above.
- the new analysis method brain activity is determined in the form of corresponding activation patterns in the areas examined in the brain and / or relationships between activation patterns in the areas examined, and direct conclusions can be drawn about functional disorders in the brain and their causes.
- the new analysis method provided by the evaluation device 140 is an expanded and more flexible one
- results or the conclusions of an examination are shown on the display device 143 and can be processed further by means of the operating and interaction device 142 in connection with the evaluation device 141. They also serve as the basis for a medical diagnosis for a patient to be examined and diagnosed.
- the fMRI measurements ie the BOLD signals in the examined brain areas of a patient, are analyzed (210 to 250) and / or compared with reference fMRI measurements. This enables immediate conclusions to be drawn about functional disorders in the brain examined and their causes.
- the new analysis method 200 which generates statistical parameters such as statistical correlations between fMRI measurements in different brain areas, is based on an expanded and more flexible mathematical model of the brain based on the known mathematical model according to (3) (220).
- the fMRI measurement comprises a large number of such data points sl, s2, ..., sT for different perception processes and / or motor tasks for which the corresponding BOLD signals were measured.
- a weighted sum of normal distributions is assumed for the statistical distribution
- the chosen statistical distribution and thus the correspondence of the probabilities depend ..., CL, ⁇ l, ..., ⁇ L, ⁇ l, ..., ⁇ L) (230) (cf. (2)) for the occurrence of the measured data points sl, s2, ..., sT from more or different parameters than the mean ⁇ and the covariance ⁇ of the old known analysis method.
- ⁇ ⁇ (C 1 , C, ⁇ 1 , ..., ⁇ , ⁇ 1 , ..., ⁇ )
- ⁇ ⁇ (C 1 , ...., C, 1 , ...,, ⁇ 1 , ..., ⁇ )
- the optimal model parameters are determined using the maximum likelihood estimation [1] by optimizing or maximizing the probabilities (5) (240).
- the parameters to be taken into account for the optimization process are the parameters of the selected higher-order statistical distribution, in this case the weighted sum of the normal distributions, the model parameters sought and the statistical variables, in this case the mean ⁇ and the covariance ⁇ from (6) which established the relationships between the model parameters and the statistical distribution (5). These relationships from (6) are constraints on the
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- Epidemiology (AREA)
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Abstract
Description
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/524,225 US7398120B2 (en) | 2002-08-09 | 2003-08-07 | Method and arrangement and computer programme with programme code means and computer programme products for the analysis of neuronal activities in neuronal areas |
AU2003266912A AU2003266912A1 (en) | 2002-08-09 | 2003-08-07 | Method and arrangement and computer programme with programme code means and computer programme products for the analysis of neuronal activities in neuronal areas |
EP03747800A EP1527406A2 (de) | 2002-08-09 | 2003-08-07 | Verfahren und anordnung sowie computerprogramm mit programmcode-mitteln und computerprogramm-produkt zur analyse von neuronalen aktivit ten in neuronalen arealen |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10236641 | 2002-08-09 | ||
DE10236641.1 | 2002-08-09 |
Publications (2)
Publication Number | Publication Date |
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WO2004021245A2 true WO2004021245A2 (de) | 2004-03-11 |
WO2004021245A3 WO2004021245A3 (de) | 2004-11-04 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/DE2003/002658 WO2004021245A2 (de) | 2002-08-09 | 2003-08-07 | Verfahren und anordnung sowie computerprogramm mit programmcode-mitteln und computerprogramm-produkt zur analyse von neuronalen aktivitäten in neuronalen arealen |
Country Status (4)
Country | Link |
---|---|
US (1) | US7398120B2 (de) |
EP (1) | EP1527406A2 (de) |
AU (1) | AU2003266912A1 (de) |
WO (1) | WO2004021245A2 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
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ITMI20012828A1 (it) * | 2001-12-28 | 2003-06-28 | Gambro Dasco Spa | Dispositivo non invasivo per il rilevamento della temperatura ematicain un circuito per la circolazione extracorporea del sangue e apparato |
US9367288B2 (en) * | 2006-11-22 | 2016-06-14 | Psigenics Corporation | Device and method responsive to influences of mind |
US7983740B2 (en) * | 2006-12-22 | 2011-07-19 | Washington University | High performance imaging system for diffuse optical tomography and associated method of use |
US9480425B2 (en) * | 2008-04-17 | 2016-11-01 | Washington University | Task-less optical mapping of dynamic brain function using resting state functional connectivity |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001039664A1 (en) * | 1999-12-02 | 2001-06-07 | The General Hospital Corporation | Method and apparatus for measuring indices of brain activity |
US20010056231A1 (en) * | 2000-03-13 | 2001-12-27 | Andrzej Jesmanowicz | High resolution MRI imaging of brain functions |
US7136696B2 (en) * | 2002-04-05 | 2006-11-14 | The Cleveland Clinic Foundation | Neuron signal analysis system and method |
-
2003
- 2003-08-07 US US10/524,225 patent/US7398120B2/en not_active Expired - Fee Related
- 2003-08-07 WO PCT/DE2003/002658 patent/WO2004021245A2/de not_active Application Discontinuation
- 2003-08-07 AU AU2003266912A patent/AU2003266912A1/en not_active Abandoned
- 2003-08-07 EP EP03747800A patent/EP1527406A2/de not_active Withdrawn
Non-Patent Citations (4)
Title |
---|
BULLMORE ED ET AL: "How good is good enough in path analysis of fMRI data?" NEUROIMAGE, Bd. 11, Nr. 4, April 2000 (2000-04), Seiten 289-301, XP002293826 ISSN: 1053-8119 * |
GONCALVES MIGUEL S ET AL: "Can meaningful effective connectivities be obtained between auditory cortical regions?" NEUROIMAGE, Bd. 14, Nr. 6, Dezember 2001 (2001-12), Seiten 1353-1360, XP002293824 ISSN: 1053-8119 * |
MCINTOSH A R ET AL: "Large-scale functional connectivity in associative learning: Interrelations of the rat auditory, visual, and limbic systems" JOURNAL OF NEUROPHYSIOLOGY (BETHESDA), Bd. 80, Nr. 6, Dezember 1998 (1998-12), Seiten 3148-3162, XP002293825 ISSN: 0022-3077 * |
MCINTOSH A R ET AL: "NETWORKS ANALYSIS OF CORTICAL VISUAL PATHWAYS MAPPED WITH PET" JOURNAL OF NEUROSCIENCE, NEW YORK, NY, US, Bd. 14, Nr. 2, Februar 1994 (1994-02), Seiten 655-666, XP009026885 ISSN: 0270-6474 * |
Also Published As
Publication number | Publication date |
---|---|
EP1527406A2 (de) | 2005-05-04 |
US20050261874A1 (en) | 2005-11-24 |
WO2004021245A3 (de) | 2004-11-04 |
US7398120B2 (en) | 2008-07-08 |
AU2003266912A1 (en) | 2004-03-19 |
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