WO2015186963A1 - 생물학적 뇌연령 산출 장치 및 그 산출 방법 - Google Patents
생물학적 뇌연령 산출 장치 및 그 산출 방법 Download PDFInfo
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- WO2015186963A1 WO2015186963A1 PCT/KR2015/005564 KR2015005564W WO2015186963A1 WO 2015186963 A1 WO2015186963 A1 WO 2015186963A1 KR 2015005564 W KR2015005564 W KR 2015005564W WO 2015186963 A1 WO2015186963 A1 WO 2015186963A1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- A61B5/055—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/0033—Features or image-related aspects of imaging apparatus classified in A61B5/00, e.g. for MRI, optical tomography or impedance tomography apparatus; arrangements of imaging apparatus in a room
- A61B5/004—Features or image-related aspects of imaging apparatus classified in A61B5/00, e.g. for MRI, optical tomography or impedance tomography apparatus; arrangements of imaging apparatus in a room adapted for image acquisition of a particular organ or body part
- A61B5/0042—Features or image-related aspects of imaging apparatus classified in A61B5/00, e.g. for MRI, optical tomography or impedance tomography apparatus; arrangements of imaging apparatus in a room adapted for image acquisition of a particular organ or body part for the brain
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/107—Measuring physical dimensions, e.g. size of the entire body or parts thereof
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/107—Measuring physical dimensions, e.g. size of the entire body or parts thereof
- A61B5/1075—Measuring physical dimensions, e.g. size of the entire body or parts thereof for measuring dimensions by non-invasive methods, e.g. for determining thickness of tissue layer
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/107—Measuring physical dimensions, e.g. size of the entire body or parts thereof
- A61B5/1076—Measuring physical dimensions, e.g. size of the entire body or parts thereof for measuring dimensions inside body cavities, e.g. using catheters
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/40—Detecting, measuring or recording for evaluating the nervous system
- A61B5/4058—Detecting, measuring or recording for evaluating the nervous system for evaluating the central nervous system
- A61B5/4064—Evaluating the brain
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7271—Specific aspects of physiological measurement analysis
- A61B5/7275—Determining trends in physiological measurement data; Predicting development of a medical condition based on physiological measurements, e.g. determining a risk factor
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7271—Specific aspects of physiological measurement analysis
- A61B5/7278—Artificial waveform generation or derivation, e.g. synthesising signals from measured signals
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/74—Details of notification to user or communication with user or patient ; user input means
- A61B5/742—Details of notification to user or communication with user or patient ; user input means using visual displays
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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
- G16H10/00—ICT specially adapted for the handling or processing of patient-related medical or healthcare data
- G16H10/20—ICT specially adapted for the handling or processing of patient-related medical or healthcare data for electronic clinical trials or questionnaires
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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
- G16H30/00—ICT specially adapted for the handling or processing of medical images
- G16H30/40—ICT specially adapted for the handling or processing of medical images for processing medical images, e.g. editing
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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
- G16H50/20—ICT specially adapted for medical diagnosis, medical simulation or medical data mining; ICT specially adapted for detecting, monitoring or modelling epidemics or pandemics for computer-aided diagnosis, e.g. based on medical expert systems
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61B2576/00—Medical imaging apparatus involving image processing or analysis
- A61B2576/02—Medical imaging apparatus involving image processing or analysis specially adapted for a particular organ or body part
- A61B2576/023—Medical imaging apparatus involving image processing or analysis specially adapted for a particular organ or body part for the heart
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- A—HUMAN NECESSITIES
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- A61B2576/02—Medical imaging apparatus involving image processing or analysis specially adapted for a particular organ or body part
- A61B2576/026—Medical imaging apparatus involving image processing or analysis specially adapted for a particular organ or body part for the brain
Definitions
- the present invention relates to a technique for calculating a biological brain age, and more particularly, an apparatus and method for measuring the cortical thickness of each region in a brain MRI image of a test subject and comparing the same with normal control information to calculate the biological brain age. It is about.
- results of blood tests and urine tests can be used by the users by presenting the normal values, but there are no standardized indicators for the brain indicators.
- the present invention has been proposed to solve the above-mentioned conventional problems, the purpose of the biological brain age calculation device according to the present invention is to measure the cortical thickness of each area in the MRI brain image of the test subject,
- the present invention provides a device that calculates and provides a biological brain age of a subject as a mathematical indicator according to thickness.
- Another object is to further include the brain age information, to store and manage the age-specific brain thickness information, brain disease characteristic information, the test subject basic information, MRI brain image information, health questionnaire information for calculating the brain age.
- Another object is to further include a brain disease prediction unit, to predict and provide specific brain disease information according to the brain age of the test subject.
- Another purpose is to derive risk lifestyle factors according to specific brain disease information predicted for each subject and to provide life guide information for prevention.
- the purpose of the biological brain age calculation method according to the present invention is to receive the basic information of the subject, health questionnaire information, MRI brain image, and to measure the brain cortex thickness information for each area to calculate and provide the brain age of the subject.
- Another purpose is to apply the cortical thickness of the test subject to the regression equation in which the degree of brain atrophy according to the age and the cortical thickness is estimated by a statistical method in calculating the brain age of the test subject.
- the biological brain age calculation apparatus includes an image information input unit for inputting an MRI brain image of a test subject, a brain age calculation control unit for controlling a biological brain age calculation task of the test subject based on the MRI brain image, the MRI brain Brain Brain thickness measurement unit for measuring the thickness of the brain cortex for each area in the image and brain age calculation unit for calculating the biological brain age of the test subject by matching the measured brain cortex thickness in the normal range of age, characterized in that it comprises a do.
- the biological brain age calculation apparatus is connected to the brain age calculation control unit, brain thickness information by age of the normal control group, brain thickness violation area information by brain disease, basic information of the test subject, the MRI brain of the test subject
- the brain age information unit may further include at least one of the image information and the health questionnaire information of the test subject.
- the biological brain age calculation apparatus is connected to the brain age calculation control unit, characterized in that it further comprises a test subject information input unit for inputting the basic information and health questionnaire information of the test subject.
- the biological brain age calculation apparatus is connected to the brain age calculation control unit, further comprising a brain disease prediction unit for providing specific brain disease information predicted according to the brain age of the test subject calculated by the brain age calculator. Characterized in that.
- the brain disease predicting unit derives an individual lifestyle factor that causes deterioration of brain thickness on the health questionnaire of the test subject according to the predicted specific brain disease information. It is characterized by providing information on life guidelines for the prevention of certain brain diseases.
- the biological brain age calculation method comprises the steps of (a) inputting the basic information and health questionnaire information of the subject using the subject information input unit, (b) the MRI brain of the subject using the image information input unit Inputting an image, (c) measuring the cortical thickness for each region in the MRI brain image by using the brain thickness measuring unit, and (d) using the brain age calculator, measuring the cortical thickness measured by the age-specific brain. Matching the normal range of thickness, and calculating the biological brain age of the test subject.
- the biological brain age calculation apparatus measures the thickness of the brain cortex for each region in the MRI brain image of the test subject, the biological brain age of the test subject according to the measured thickness of the brain cortex as a mathematical indicator By calculating, it is possible to provide an accurate brain health state to the test subjects during the medical examination, and further has an effect of enabling the prevention of brain diseases by utilizing for early brain health examination.
- the test subjects can actively improve their lifestyle to prevent brain disease. There is.
- the biological brain age calculation method can calculate and provide the biological brain age of the test subject by receiving the basic information of the subject, health questionnaire information, MRI brain image and measuring the cortical thickness information for each region, and health At the time of examination, it is effective to provide prediction and diagnostic information for degenerative brain disease.
- Another object is to calculate the brain age of the subject by applying the brain cortex thickness of the subject to the regression equation applying the degree of brain atrophy according to the age and the cortical thickness by the estimation statistical method.
- the brain age data can be used to consult the exact brain health status.
- FIG. 1 is a block diagram showing the overall configuration of the biological brain age calculation apparatus according to the present invention.
- FIG. 2 is a view showing the relationship between age and brain cortex thickness according to male, female, integrated gender in calculating the biological brain age according to the present invention.
- FIG. 3 is a diagram illustrating an embodiment of individual brain age calculation in the relationship between age and brain cortex thickness in the biological brain age calculation apparatus according to the present invention.
- FIG. 4 is a diagram illustrating an embodiment of a calculation result display unit in a biological brain age calculation apparatus according to the present invention.
- Figure 5 is a flow chart showing the overall flow of the biological brain age calculation method according to the present invention.
- FIG. 6 is a flow chart showing the detailed flow of the step S60 in the biological brain age calculation method according to the present invention.
- FIG. 1 is a view showing the overall configuration of the biological brain age calculation apparatus according to the present invention, the image information input unit 10, brain age calculation control unit 20, test subject information input unit 30, brain thickness measurement unit 40 , Brain age calculation unit 50, brain disease prediction unit 60, brain age information unit 70 and the calculation result display unit 80.
- the image information input unit 10 inputs an MRI brain image of a test subject, and the MRI brain image according to the present invention preferably inputs an image for checking a cortical state for each brain region of the test subject, and the image information input unit
- the MRI brain image information input at 10 is transmitted to the brain age calculation control unit 20.
- the brain age calculation control unit 20 controls the biological brain age calculation task of the test subject based on the MRI brain image, the MRI brain image information is transferred, the brain thickness measurement unit 40 to the brain for each region You will be asked to calculate cortical thickness.
- the test subject information input unit 30 is connected to the brain age calculation control unit 20 to input basic test information and health questionnaire information of the test subject, and the MRI brain image input through the test subject information input unit 30.
- the test subjects can be identified, and the health questionnaire information prepared by the test subjects can be used for information on brain diseases that can occur later.
- the basic information includes at least one or more of a test subject's name, age, gender, BMI, health insurance card number, and educational attainment information
- the health questionnaire information includes the usual lifestyle or past illness of the test subject. It includes information that can identify your current health status.
- the brain thickness measurement unit 40 is connected to the brain age calculation control unit 20 to measure the cortical thickness for each region in the MRI brain image, and calculate the total average brain thickness and region-specific brain thickness of the test subject.
- the total average brain thickness and the area-specific brain thickness may be transmitted to the brain age calculation control unit 20.
- the brain age calculation unit 50 is connected to the brain age calculation control unit 20, matching the measured brain cortex thickness to the normal range of brain thickness by age, to calculate the biological brain age of the test subject, the present invention
- the brain age calculation unit 50 calculates the brain age of the test subject by applying the brain cortex thickness of the test subject to the regression equation that is applied to the degree of brain atrophy according to the age and the cortical thickness by a statistical method.
- MRI photographed by subjects of the normal control group by age, the average brain thickness and the brain thickness by region can be calculated, the brain thickness by age of the normal control group can be calculated, in the embodiment of the present invention, the average of 2500 subjects
- a graph as shown in (c) of FIG. 2 may be derived, and as shown in (a) and (b) of FIG. 2, average brain thickness information may be derived according to gender.
- the brain disease predicting unit 60 is connected to the brain age calculating control unit 20 and provides specific brain disease information predicted according to the brain age of the test subject calculated by the brain age calculating unit.
- the brain age is calculated by matching the age and cerebral cortex thickness information of the normal control, as shown in Figure 3, the person with a low brain thickness A and the person with a high brain thickness B at the same age
- the A person was found to have low education level, high BMI, high blood pressure, diabetes, alcohol, and a lot of cigarettes, and the B person had high education level, BMI was appropriate, high blood pressure, There is no diabetes, alcohol and tobacco do not appear, according to the current degree of brain atrophy can provide degenerative brain disease information.
- the brain disease predicting unit 60 derives individual lifestyle factors that cause deterioration of brain thickness on the health questionnaire of the test subject according to the predicted specific brain disease information, and guides life for preventing a specific brain disease. Information may be provided through the calculation result display unit 80.
- the calculation result display unit 80 is connected to the brain age calculation control unit 20, and displays the brain age calculation process of the test subject to the outside, in the embodiment of the present invention, as shown in FIG. Name, gender, age, and test date are displayed, and brain age calculation results and brain disease prediction information are displayed.
- the brain age information unit 70 is connected to the brain age calculation control unit 20, the brain thickness information by age, gender, and education of the normal control group, brain thickness violation area information by brain disease, basic information of the test subject, At least one of the MRI brain image information of the test subject and the health questionnaire information of the test subject is stored.
- the biological brain age calculation apparatus measures the thickness of the brain cortex for each region in the MRI brain image of the test subject, the biological brain age of the test subject according to the measured thickness of the brain cortex as a mathematical indicator By calculating, there is an effect that can provide an accurate brain health state to the test subjects during the health examination, and furthermore, it is effective to enable the prevention of brain diseases by utilizing for early brain health examination.
- the basic information input in step S10 includes at least one or more of a test subject's name, age, gender, BMI, health insurance card number, and educational attainment information. Information about your current health status, including your usual lifestyle and past illnesses.
- the step of storing the brain thickness information by age, sex, and educational attainment and the brain thickness violation area information by brain disease in the brain age information unit are preceded. .
- the step S20 of inputting the MRI brain image of the test subject by using the image information input unit 10 is performed, and the area of the MRI brain image by the brain thickness measurement unit 40 is performed.
- Measuring the cortical thickness (S30), and using the brain age calculation unit 50, by matching the measured brain cortex thickness to the normal brain thickness by age range, biological brain age of the test subject The calculating step S40 is performed.
- the step S40 calculates the brain age of the test subject by applying the brain cortex thickness of the test subject to the regression equation applied by the statistical method to estimate the degree of brain atrophy according to age and brain cortex thickness.
- step S50 if degenerative brain disease information exists in step S50, the predicted brain disease information is provided (S60).
- step S60 the specific brain disease information is derived (S61) to be predicted, and according to the predicted specific brain disease information, the individual causes the deterioration of the brain thickness on the health questionnaire of the test subject.
- step S70 of displaying the calculated brain age of the test subject and the predicted specific brain disease information is performed on the calculation result display unit 80, and the brain age calculated from the brain age information unit 70 is predicted.
- a step of storing specific brain disease information is performed (S80).
- applying the biological brain age calculation method according to the present invention receives the basic information of the subject, health questionnaire information, MRI brain images and by measuring the area of brain cortex thickness by area to measure the biological brain age of the subject It can be calculated and provided, and can provide the effect of providing prediction and diagnostic information for degenerative brain diseases during health examinations.
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Abstract
Description
Claims (13)
- 검사 대상자의 MRI 뇌 영상을 입력하는 영상정보 입력부;상기 MRI 뇌 영상을 기반으로 상기 검사 대상자의 생물학적 뇌연령 산출 작업을 제어하는 뇌연령 산출 제어부;상기 MRI 뇌 영상에서 영역별 뇌피질 두께를 측정하는 뇌두께 측정부 및측정된 상기 뇌피질 두께를 연령별 뇌두께 정상 범위에 매칭하여, 상기 검사 대상자의 생물학적 뇌연령을 산출하는 뇌연령 산출부를 포함하는 것을 특징으로 하는 생물학적 뇌연령 산출 장치.
- 제1항에 있어서,상기 뇌연령 산출 제어부와 연결되어, 정상 대조군의 연령별 뇌두께 정보, 뇌질환별 뇌두께 침범 영역 정보, 상기 검사 대상자의 기본 정보, 상기 검사 대상자의 MRI 뇌 영상 정보, 상기 검사 대상자의 건강문진표 정보 중 적어도 어느 하나 이상의 정보를 저장하는 뇌연령 정보부를 더 포함하는 것을 특징으로 하는 생물학적 뇌연령 산출 장치.
- 제1항에 있어서,상기 뇌연령 산출 제어부와 연결되어, 검사 대상자의 기본 정보 및 건강문진표 정보를 입력하는 검사 대상자 정보 입력부를 더 포함하는 것을 특징으로 하는 생물학적 뇌연령 산출 장치.
- 제3항에 있어서,상기 뇌연령 산출부는연령과 뇌피질 두께에 따른 뇌 위축 정도를 추정 통계학적 방법으로 적용한 회귀식에 검사 대상자의 뇌피질 두께를 적용하여 검사 대상자의 뇌연령을 산출하는 것을 특징으로 하는 생물학적 뇌연령 산출 장치.
- 제4항에 있어서,상기 뇌연령 산출 제어부와 연결되어, 상기 뇌연령 산출부에서 산출된 검사 대상자의 뇌연령에 따른 예측되는 특정 뇌질환 정보를 제공하는 뇌질환 예측부를 더 포함하는 것을 특징으로 하는 생물학적 뇌연령 산출 장치.
- 제5항에 있어서,상기 뇌질환 예측부는,예측된 상기 특정 뇌질환 정보에 따라 상기 검사 대상자의 건강 문진표 상에서의 뇌두께의 악화를 초래하는 개인별 생활습관인자를 도출하고, 특정 뇌질환 예방을 위한 생활 지침 정보를 제공하는 것을 특징으로 하는 생물학적 뇌연령 산출 장치.
- 제1항에 있어서,상기 뇌연령 산출 제어부와 연결되어, 검사 대상자의 뇌연령 산출 과정을 외부에 표시하는 산출결과 표시부를 더 포함하는 것을 특징으로 하는 생물학적 뇌연령 산출 장치.
- (a) 검사 대상자 정보 입력부를 이용하여, 검사 대상자의 기본 정보 및 건강문진표 정보를 입력하는 단계;(b) 영상정보 입력부를 이용하여, 검사 대상자의 MRI 뇌 영상을 입력하는 단계;(c) 뇌두께 측정부를 이용하여, 상기 MRI 뇌 영상에서 영역별 뇌피질 두께를 측정하는 단계 및(d) 뇌연령 산출부를 이용하여, 측정된 상기 뇌피질 두께를 연령별 뇌두께 정상 범위에 매칭하여, 상기 검사 대상자의 생물학적 뇌연령을 산출하는 단계를 포함하는 것을 특징으로 하는 생물학적 뇌연령 산출 방법.
- 제8항에 있어서,상기 (d) 단계는,연령과 뇌피질 두께에 따른 뇌 위축 정도를 추정 통계학적 방법으로 적용한 회귀식에 검사 대상자의 뇌피질 두께를 적용하여 검사 대상자의 뇌연령을 산출하는 단계인 것을 특징으로 하는 생물학적 뇌연령 산출 방법.
- 제8항에 있어서,상기 (d) 단계 이후에,(e) 뇌질환 예측부를 이용하여, 상기 (d) 단계에서 산출된 검사 대상자의 뇌연령에 따른 예측되는 특정 뇌질환 정보를 제공하는 단계를 더 포함하는 것을 특징으로 하는 생물학적 뇌연령 산출 방법.
- 제10항에 있어서,상기 (e) 단계는,(e-1) 예측된 상기 특정 뇌질환 정보에 따라 상기 검사 대상자의 건강 문진표 상에서의 뇌두께의 악화를 초래하는 개인별 생활습관인자를 도출하는 단계 및(e-2) 특정 뇌질환 예방을 위한 생활 지침 정보를 제공하는 단계를 더 포함하는 것을 특징으로 하는 생물학적 뇌연령 산출 방법.
- 제10항에 있어서,상기 (e) 단계 이후에,(g) 산출결과 표시부에 검사 대상자의 산출된 뇌연령과 예측되는 특정 뇌질환 정보를 표시하는 단계 및(g) 상기 뇌연령 정보부에 산출된 뇌연령과 예측되는 특정 뇌질환 정보를 저장하는 단계를 더 포함하는 것을 특징으로 하는 생물학적 뇌연령 산출 방법.
- 제8항에 있어서,상기 (a) 단계 이전에,(g) 뇌연령 정보부를 이용하여, 정상 대조군의 연령별, 성별, 학력별 뇌두께 정보와 뇌질환별 뇌두께 침범 영역 정보를 저장하는 단계를 더 포함하는 것을 특징으로 하는 생물학적 뇌연령 산출 방법.
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EP3882850A1 (en) * | 2020-03-20 | 2021-09-22 | Siemens Healthcare GmbH | Method and system for measuring a maturation stage using mri |
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EP3153100A4 (en) | 2018-02-07 |
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