WO2022153781A1 - 分析装置及び分析方法 - Google Patents
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Definitions
- This disclosure relates to an analyzer and an analysis method.
- Brown adipose tissue is adipose tissue, but has the property of burning fat and consuming energy by a specific uncoupling protein (UCP1).
- UCP1 uncoupling protein 1
- brown adipose tissue affects systemic sugar and lipid metabolism and insulin sensitivity. It has been reported that brown adipose tissue plays a role as an endocrine organ by being involved in systemic metabolic control via secretory substances and nerves. If it becomes possible to control the weight and activity of brown adipose tissue, it is expected to prevent or improve metabolic diseases such as metabolic syndrome.
- positron emission tomography FLD-PET examination
- fluorodeoxyglucose which is a glucose-like substance
- Patent Document 1 near-infrared time-resolved spectroscopy (TRS) is used to evaluate brown adipose tissue based on the total amount of hemoglobin at the measurement site.
- TRS near-infrared time-resolved spectroscopy
- Non-Patent Document 1 discloses that the process of beige white fat is detected based on the ratio of the reflection intensity at wavelengths of 550 nm and 680 nm and the slope of the spectrum at wavelengths of 570 nm to 630 nm.
- fat and water are used so that the difference between the actually measured diffuse reflection spectrum obtained in the wavelength range of 1050 nm to 1350 nm and the reflection spectrum modeled from the lookup table based on the Monte Carlo simulation is minimized. It is disclosed that the volume fraction of white fat is determined and the process of beigeification of white fat is detected from the volume fraction.
- brown adipose tissue In order to promote clinical applications such as research on brown adipose tissue, treatment using brown adipose tissue, and disease prevention in humans, a method more specialized in the analysis of brown adipose tissue and beige fat is required. For example, if it becomes possible to carry out quantitative evaluation of brown adipose tissue or beige fat as well as relative evaluation of brown adipose tissue and beige fat, it will be a foundation for future research and application of brown adipose tissue. ..
- the present disclosure has been made to solve the above problems, and an object of the present disclosure is to provide an analyzer and an analysis method capable of quantitatively evaluating brown adipose tissue or beige fat.
- the applicant of the present application focused on the spectral characteristics of brown adipose tissue and beige fat while conducting diligent research on the above-mentioned problems, and found that brown adipose tissue and beige fat have light absorption characteristics not found in white fat. It turned out. Further, when a cold stimulus was applied to the brown adipose tissue and the beige fat, the light absorption characteristics of the brown adipose tissue and the beige fat changed with the stimulus. It was found that there is a certain correlation between the amount of change in the light absorption characteristics and the amount of change in triglyceride obtained from biochemical analysis.
- the applicant of the present application combines the analysis of the triglyceride amount based on the spectral data of the object to be measured and the regression model for the prediction of the triglyceride amount in the object to be measured to obtain brown adipose tissue or beige fat.
- We have completed the content of this disclosure based on the finding that quantitative evaluation can be easily carried out.
- the analyzer detects a light irradiation unit that irradiates a measurement light including light in a wavelength band of 900 nm toward the object to be measured, and detects the reflected light from the object to be measured, and reflects the light in the object to be measured. It has a light detection unit that acquires light spectrum data, a data processing unit that performs noise removal processing on the spectrum data acquired by the light detection unit, and a PLS regression model for predicting the amount of neutral fat in the object to be measured.
- the first determination unit for determining the amount of neutral fat in the object to be measured and the amount of neutral fat in the object to be measured A second judgment unit that holds data showing the correlation and determines the amount of brown fat tissue or beige fat in the object to be measured based on the data and the amount of neutral fat determined by the first judgment unit. And.
- the spectrum data of the reflected light in the object to be measured is acquired, and the acquired spectrum data is subjected to noise reduction processing.
- the spectral data after the noise removal treatment the light absorption characteristics in the 900 nm wavelength band differ depending on the presence or absence of brown adipose tissue, beige fat, and white fat in the object to be measured. Therefore, the amount of triglyceride in the object to be measured can be determined by applying the spectrum data subjected to the noise reduction processing to the PLS regression model created in advance.
- the absolute value of the amount of brown adipose tissue or the amount of beige fat in the object to be measured can be determined by comparing the determination result of the amount of triglyceride with the data showing the correlation with the amount of triglyceride in the object to be measured.
- the PLS regression model may be a model based on the value of the fat absorption peak in the spectrum data subjected to the noise reduction processing. By using the PLS regression model based on the value of the fat absorption peak, it is possible to improve the accuracy of determining the amount of triglyceride in the object to be measured.
- the first determination unit is the presence or absence of brown adipose tissue, beige fat, and white fat in the object to be measured, based on the presence or absence of absorption peaks of water in the wavelength band of 900 nm in the spectrum data subjected to the noise removal treatment. May be judged. Brown adipose tissue and beige fat tend to have a water absorption peak in the wavelength 900 nm band, and white adipose tissue tends to have no water absorption peak in the wavelength 900 nm band.
- the amount of information obtained in the analysis can be further increased by determining the presence or absence of brown adipose tissue, beige fat, and white fat in the object to be measured based on the presence or absence of absorption peaks of water in the wavelength band of 900 nm. can.
- the second judgment unit holds data showing the correlation with the amount of triglyceride in the measured object to which the stimulus is applied, and is based on the data and the amount of triglyceride determined by the first judgment unit. Therefore, the amount of brown adipose tissue or the amount of beige fat in the stimulated object to be measured may be determined. In this case, the amount of brown adipose tissue or the amount of beige fat in the object to be stimulated can be accurately determined. Since the change in the amount of brown adipose tissue or the amount of beige fat in the object to be measured before and after the application of the stimulus can be remarkably determined, the range of application of the analysis can be further expanded.
- the analysis method includes a light irradiation step of irradiating a measurement object with measurement light including light in a wavelength band of 900 nm toward the object to be measured, and detecting reflected light from the object to be measured and reflecting the light in the object to be measured.
- Noise removal processing is performed using a light detection step for acquiring light spectrum data, a data processing step for performing noise removal processing on the spectrum data acquired in the light detection step, and a PLS regression model for predicting neutral fat mass.
- the first determination step for determining the amount of neutral fat in the object to be measured and the data showing the correlation with the amount of neutral fat in the object to be measured are used.
- a second determination step is provided for determining the amount of brown adipose tissue or the amount of beige fat in the object to be measured based on the data and the amount of neutral fat determined in the first determination step.
- the spectrum data of the reflected light in the object to be measured is acquired, and the acquired spectrum data is subjected to noise reduction processing.
- the spectral data after the noise removal treatment the light absorption characteristics in the 900 nm wavelength band differ depending on the presence or absence of brown adipose tissue, beige fat, and white fat in the object to be measured. Therefore, the amount of triglyceride in the object to be measured can be determined by applying the spectrum data subjected to the noise reduction processing to the PLS regression model created in advance.
- the absolute value of the amount of brown adipose tissue or the amount of beige fat in the object to be measured can be determined by comparing the determination result of the amount of triglyceride with the data showing the correlation with the amount of triglyceride in the object to be measured.
- the PLS regression model a model based on the value of the fat absorption peak in the spectrum data subjected to the noise reduction processing may be used.
- the PLS regression model based on the value of the fat absorption peak, it is possible to improve the accuracy of determining the amount of triglyceride in the object to be measured.
- the presence or absence of brown adipose tissue, beige fat, and white fat in the object to be measured is based on the presence or absence of absorption peaks of water in the wavelength band of 900 nm in the spectrum data subjected to the noise removal treatment. May be judged. Brown adipose tissue and beige fat tend to have a water absorption peak in the wavelength 900 nm band, and white adipose tissue tends to have no water absorption peak in the wavelength 900 nm band.
- the amount of information obtained in the analysis can be further increased by determining the presence or absence of brown adipose tissue, beige fat, and white fat in the object to be measured based on the presence or absence of absorption peaks of water in the wavelength band of 900 nm. can.
- the second determination step data showing the correlation with the amount of triglyceride in the object to be stimulated is used, and based on the data and the amount of triglyceride determined in the first determination step.
- the amount of brown adipose tissue or the amount of beige fat in the object to be stimulated may be determined.
- the amount of brown adipose tissue or the amount of beige fat in the object to be stimulated can be accurately determined. Since the change in the amount of brown adipose tissue or the amount of beige fat in the object to be measured before and after the application of the stimulus can be remarkably determined, the range of application of the analysis can be further expanded.
- (A) is a diagram showing the time course of the value of the fat absorption peak in the brown adipose tissue in the control group and the stimulation-giving group, and (b) is the inside of the brown adipose tissue in the control group and the stimulation-giving group. It is a figure which shows the time-dependent change of the sex fat mass.
- (A) is a diagram showing the time course of the value of the absorption peak of fat in beige fat in the control group and the stimulation-giving group, and (b) is the neutral fat in beige fat in the control group and the stimulation-giving group. It is a figure which shows the time-dependent change of the amount.
- FIG. 1 is a block diagram showing a configuration of an analyzer according to an embodiment of the present disclosure.
- the analyzer 1 shown in FIG. 1 is configured as an apparatus for measuring the absolute value of the amount of brown adipose tissue or the absolute value of the amount of beige fat in the object S to be measured.
- the analyzer 1 enables discrimination between brown adipose tissue and beige fat and white fat, which was difficult with conventional positron tomography (PET) examination and thermography, and easily realizes quantitative evaluation of brown adipose tissue or beige fat.
- PET positron tomography
- the object S to be measured is, for example, a living tissue of a human or an animal.
- the object S to be measured may be a tissue in a living body or a tissue obtained by cutting out a part of the living body.
- brown adipose tissue is adipose tissue, it has the property of burning fat and consuming energy by the specific uncoupling protein UCP1.
- the cell origin is muscle progenitor cells. Morphological features include multilocular lipid droplets and are rich in mitochondria.
- the main site of brown adipose tissue in humans is between the scapula in the neonatal period and around the kidney in adults.
- Beige fat is one in which UCP1 appears in white fat and becomes beige, and has the same properties as brown adipose tissue.
- the main sites of beige fat in humans are the supraclavicular fossa and paravertebral spine.
- the cell origin is preadipocytes.
- Morphological features like brown adipose tissue, include multilocular lipid droplets and are rich in mitochondria.
- White fat mainly has energy storage and release as a physiological function.
- the main location of white fat in humans is subcutaneously throughout the body and around the internal organs.
- the cell origin is preadipocytes.
- Morphological features include single tufted lipid droplets.
- the main constituent of white fat is triglyceride.
- Examples of application of the analyzer 1 include the medical field and the sports field.
- the medical field for example, it can be applied to the treatment / prevention of diabetes and dyslipidemia.
- Brown adipose tissue is known to be highly associated with insulin sensitivity and lipid metabolism.
- Drug-independent treatment by comparing the amount of brown adipose tissue or beige fat in diabetic patients and patients with abnormal lipid metabolism with the amount of brown adipose tissue or beige fat in healthy subjects and increasing the amount of brown adipose tissue or beige fat ⁇ Prevention is expected.
- the analyzer 1 includes a probe 2 and a calculation unit 3.
- the analyzer 1 is connected to the display device 4 so as to be able to communicate with each other.
- the display device 4 is a monitor, a touch panel display, or the like.
- the display device 4 receives the analysis result information from the analysis device 1 and displays the information.
- the probe 2 has a light irradiation unit 11 and a light detection unit 12.
- the probe 2 is connected to the arithmetic unit 3 so as to be able to communicate with each other.
- the probe 2 may be a handy type probe in which the light irradiation unit 11 and the photodetection unit 12 are housed in a small housing.
- the probe 2 may be a wireless probe capable of wireless communication with the arithmetic unit 3. In this case, the degree of freedom of the measurement posture in the analyzer 1 can be increased. For example, by fixing a wireless probe to a part of the body, it becomes possible to measure during meals and exercise, and it becomes easy to acquire data on changes over time during the day.
- the light irradiation unit 11 is a portion that irradiates the measurement light I including light in the wavelength band of 900 nm toward the object S to be measured.
- the light source constituting the light irradiation unit 11 for example, a halogen light source, LD, LED, SLD or the like can be used.
- the wavelength band of the measurement light I is, for example, 900 nm to 1000 nm. This wavelength band includes 920 nm to 930 nm in which a fat absorption peak is present and 960 nm to 970 nm in which a water absorption peak is present.
- the light detection unit 12 is a part that detects the reflected light R from the object S to be measured and acquires the spectrum data of the reflected light R in the object S to be measured.
- the detection element constituting the photodetector 12 for example, a CCD array, a CMOS array, a PD array, or the like can be used.
- the light detection unit 12 outputs information indicating the detection result to the calculation unit 3.
- the photodetector 12 may have an integrating sphere. In this case, by diffusing and reflecting the reflected light R from the object S to be measured in the integrating sphere, uniform diffuse reflection spectrum data of the reflected light R can be obtained.
- the calculation unit 3 is a part that performs various calculations based on the information from the light detection unit 12.
- the arithmetic unit 3 is physically a computer system including a memory such as a RAM and a ROM, a processor (arithmetic circuit) such as a CPU, a communication interface, and a storage unit such as a hard disk. Examples of such a computer system include a personal computer, a cloud server, a smart device (smartphone, tablet terminal, etc.) and the like.
- the arithmetic unit 3 functions as a controller of the analyzer 1 by executing a program stored in the memory on the CPU of the computer system.
- the calculation unit 3 has a data processing unit 21, a first determination unit 22, and a second determination unit 23 as functional components.
- the data processing unit 21 is a unit that performs noise reduction processing on the spectrum data acquired by the light detection unit 12. Examples of the noise reduction process include quadratic differentiation such as the Sabitsuki-Goray differentiation.
- the data processing unit 21 outputs the spectrum data after the noise reduction processing to the first determination unit 22.
- the first determination unit 22 is a portion for determining the amount of triglyceride in the object S to be measured.
- the brown fat in the object S to be measured is based on the presence or absence of the absorption peak of water in the wavelength 900 nm band in the spectrum data. Determine the presence or absence of tissue, beige fat, and white fat.
- FIG. 2 and 3 are diagrams showing an example of the spectrum of reflected light.
- FIG. 2 shows a quadratic differential spectrum of a group of objects to be measured (control group) to which no stimulus is applied.
- FIG. 3 shows a quadratic differential spectrum of a group of objects to be measured (stimulation group) to which a stimulus is applied.
- the stimulus here is a cold stimulus.
- 5 rats bred at room temperature of 24 ° C. for 28 days were prepared, and in the stimulation-giving group, 5 rats bred at room temperature of 4 ° C. for 28 days were prepared.
- the water absorption peak (peak with a negative value) P1 exists in the vicinity of the wavelength of 960 nm to 970 nm regardless of the application of stimulation. I understand. Further, from the results shown in FIGS. 2 and 3, it can be seen that the absorption peak (peak with a negative value) P1 of water does not exist in the vicinity of the wavelength of 960 nm to 970 nm in the white fat regardless of the application of the stimulus. ..
- the presence or absence of brown adipose tissue, beige fat, and white fat in the object S can be determined based on the presence or absence of the absorption peak of water in the wavelength band of 900 nm in the spectral data.
- the first determination unit 22 has a PLS regression model for predicting the amount of triglyceride in the object S to be measured in determining the amount of triglyceride in the object S to be measured.
- the PLS regression model here is a model based on the value of the fat absorption peak in the spectral data subjected to the noise reduction processing.
- the first determination unit 22 determines the amount of triglyceride in the object S to be measured by applying the spectrum data to the PLS regression model. ..
- the first determination unit 22 generates information indicating the determination result of the amount of triglyceride in the object S to be measured, and outputs the information to the second determination unit 23.
- FIG. 4 is a diagram showing an example of a predicted value of the amount of triglyceride in brown adipose tissue from the PLS regression model.
- the horizontal axis is the measured value of triglyceride mass
- the vertical axis is the predicted value of triglyceride mass.
- FIG. 5 is a diagram showing an example of a predicted value of the amount of triglyceride in beige fat from the PLS regression model.
- the horizontal axis is the measured value of triglyceride mass
- the vertical axis is the predicted value of triglyceride mass.
- the second determination unit 23 is a portion for determining the amount of brown adipose tissue or the amount of beige fat in the object S to be measured.
- the second determination unit 23 holds data showing a correlation with the amount of neutral fat in the object S to be measured in determining the amount of brown adipose tissue or the amount of beige fat in the object S to be measured.
- the second determination unit 23 receives information indicating the determination result of the amount of triglyceride in the object S to be measured from the first determination unit 22, the data and the neutrality determined by the first determination unit 22
- the amount of brown adipose tissue or the amount of beige fat in the object S to be measured is determined based on the amount of fat.
- the second determination unit 23 generates information indicating the determination result of the amount of brown adipose tissue or the amount of beige fat in the object S to be measured, and outputs the information to the display device 4.
- FIG. 6 is a diagram showing the correlation between the amount of triglyceride and the amount of brown adipose tissue in the control group.
- the horizontal axis is the amount of triglyceride
- the vertical axis is the amount of brown adipose tissue.
- FIG. 7 is a diagram showing the correlation between the amount of triglyceride and the amount of beige fat in the control group.
- the horizontal axis is the amount of triglyceride
- the vertical axis is the amount of beige fat. From the results shown in FIG. 7, it can be seen that there is a certain correlation between the amount of triglyceride and the amount of beige fat in the control group.
- the absolute value of the beige fat amount can be determined based on the neutral fat amount determined by the first determination unit 22.
- the second determination unit 23 may have data showing the correlation with the neutral fat in the object S to be stimulated. In this case, the second determination unit 23 determines the amount of brown adipose tissue or beige in the measured object S to which the stimulus is applied, based on the data and the amount of neutral fat determined by the first determination unit 22. Determine the amount of fat. The second determination unit 23 generates information indicating the determination result of the amount of brown adipose tissue or the amount of beige fat in the object S to be stimulated, and outputs the information to the display device 4. The second determination unit 23 may determine both the amount of brown adipose tissue and the amount of beige fat in the object S to be measured, or may determine only one of them.
- FIG. 8 is a diagram showing the correlation between the amount of triglyceride and the amount of brown adipose tissue in the stimulation-giving group.
- the horizontal axis is the amount of triglyceride
- the vertical axis is the amount of brown adipose tissue.
- FIG. 9 is a diagram showing the correlation between the amount of triglyceride and the amount of beige fat in the stimulation-giving group.
- the horizontal axis is the amount of triglyceride
- the vertical axis is the amount of beige fat. From the results shown in FIG. 9, it can be seen that there is a certain correlation between the amount of triglyceride and the amount of beige fat even in the stimulation-giving group.
- the absolute value of the beige fat amount can be determined based on the neutral fat amount determined by the first determination unit 22.
- FIG. 10 is a flowchart showing the analysis method in the present embodiment.
- this analysis method includes a light irradiation step (step S01), a light detection step (step S02), a data processing step (step S03), a first determination step (step S04), and a first. It is configured to include the determination step (S05) of 2.
- the probe 2 of the analyzer 1 is set on the object S to be measured, and the measurement light I including light having a wavelength of 900 nm is irradiated from the light irradiation unit 11 of the probe 2 toward the object S to be measured.
- the measurement light I applied to the object S to be measured is reflected by the object S to be measured and becomes the reflected light R.
- the reflected light R from the object S to be measured is detected by the light detection unit 12 of the probe 2, and the spectrum data of the reflected light R in the object S to be measured is acquired.
- the spectrum data obtained by the light detection unit 12 is uniform diffuse reflection spectrum data of the reflected light R.
- noise reduction processing is performed on the spectrum data acquired by the photodetector 12.
- differential processing such as quadratic differentiation or Sabitsuki-Goray differentiation is applied to the spectrum data acquired by the photodetector 12.
- the presence of brown adipose tissue, beige fat, and white fat in the object S to be measured is based on the presence or absence of an absorption peak of water in the wavelength band of 900 nm in the spectrum data subjected to the noise removal treatment. Judge the presence or absence.
- the PLS regression model for predicting the amount of neutral fat is used, and the spectrum data subjected to the noise removal processing is applied to the PLS regression model to obtain the neutral fat in the object S to be measured. Judge the amount.
- the PLS regression model a model based on the value of the fat absorption peak P2 in the spectrum data subjected to the noise reduction treatment is used.
- the second determination step data showing the correlation with the amount of neutral fat in the object to be measured S is used, and the object to be measured is based on the data and the amount of neutral fat determined in the first determination step.
- the amount of brown fat tissue or the amount of beige fat in S is determined.
- the second determination step data showing the correlation with the amount of triglyceride in the stimulated object S to which the stimulus is given is used. ..
- the amount of brown adipose tissue or the amount of beige fat in the stimulated object S is determined based on the data and the amount of triglyceride determined by the first determination unit 22. do.
- the spectrum data of the reflected light R in the object S to be measured is acquired, and the acquired spectrum data is subjected to noise removal processing.
- the spectral data after the noise removal treatment the light absorption characteristics in the 900 nm wavelength band differ depending on the presence or absence of brown adipose tissue, beige fat, and white fat in the object S to be measured. Therefore, the amount of triglyceride in the object S to be measured can be determined by applying the spectrum data subjected to the noise reduction processing to the PLS regression model created in advance.
- the absolute value of the brown adipose tissue amount or the beige fat amount in the object S can be determined. ..
- the PLS regression model is a model based on the value of the fat absorption peak in the spectrum data subjected to the noise reduction processing.
- the first determination unit 22 determines the brown adipose tissue and beige fat in the object S to be measured, based on the presence or absence of the absorption peak P1 of water in the wavelength 900 nm band in the spectrum data subjected to the noise removal treatment. , And the presence or absence of white fat is judged. Brown adipose tissue and beige fat tend to have a water absorption peak P1 in the wavelength 900 nm band, and white adipose tissue tends to have no water absorption peak P1 in the wavelength 900 nm band (FIGS. 2 and 3). reference).
- Absolute amount of brown adipose tissue or beige fat by determining the presence or absence of brown adipose tissue, beige fat, and white fat in the object S based on the presence or absence of absorption peak of water in the wavelength 900 nm band.
- analysis results regarding the presence or absence of brown adipose tissue, beige fat, and white fat can be obtained. Therefore, the amount of information obtained in the analysis can be further increased. Further, for example, when it is determined that brown adipose tissue or beige fat does not exist, the time required for the treatment can be shortened by not performing the treatment for determining the absolute value of the brown adipose tissue amount or the beige fat amount.
- the second determination unit 23 holds data showing the correlation with the amount of neutral fat in the measured object S to which the stimulus is applied, and the data and the first determination unit 22 determine the data.
- the amount of brown adipose tissue or the amount of beige fat in the stimulated object S is determined based on the amount of neutral fat. In this case, the amount of brown adipose tissue or the amount of beige fat in the object S to be stimulated can be accurately determined. Since the change in the amount of brown adipose tissue or the amount of beige fat in the object S to be measured before and after the application of the stimulus can be remarkably determined, the range of application of the analysis can be further expanded.
- the analyzer 1 determines the amount of change in brown adipose tissue or beige fat based on the change in the value of the fat absorption peak P2 (see FIGS. 2 and 3) in the spectrum data subjected to the noise removal treatment. It may be provided with a part.
- FIG. 11A is a diagram showing changes over time in the value of fat absorption peak in brown adipose tissue in the control group and the stimulation-giving group.
- FIG. 11B is a diagram showing changes over time in the amount of triglyceride in brown adipose tissue in the control group and the stimulation-giving group. The results in the figure are based on biochemical analysis. The fat absorption peak in brown adipose tissue exists at a wavelength of around 924 nm.
- FIG. 12A is a diagram showing changes over time in the value of fat absorption peak in beige fat in the control group and the stimulation-giving group.
- FIG. 12B is a diagram showing changes over time in the amount of triglyceride in beige fat in the control group and the stimulation-giving group. The results in the figure are based on biochemical analysis. The fat absorption peak in beige fat exists at a wavelength of around 926 nm.
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Abstract
Description
Claims (8)
- 波長900nm帯の光を含む計測光を被測定物に向けて照射する光照射部と、
前記被測定物からの反射光を検出し、前記被測定物における前記反射光のスペクトルデータを取得する光検出部と、
前記光検出部で取得された前記スペクトルデータにノイズ除去処理を施すデータ処理部と、
被測定物中の中性脂肪量の予測に関するPLS回帰モデルを保有し、前記ノイズ除去処理が施された前記スペクトルデータを前記PLS回帰モデルに適用することにより、前記被測定物中の中性脂肪量を判断する第1の判断部と、
被測定物中の中性脂肪量との相関を示すデータを保有し、当該データと前記第1の判断部で判断された前記中性脂肪量とに基づいて、前記被測定物中の褐色脂肪組織量或いはベージュ脂肪量を判断する第2の判断部とを備える分析装置。 - 前記PLS回帰モデルは、前記ノイズ除去処理が施された前記スペクトルデータにおける脂肪の吸収ピークの値に基づくモデルである請求項1記載の分析装置。
- 前記第1の判断部は、前記ノイズ除去処理が施された前記スペクトルデータにおける波長900nm帯の水の吸収ピークの有無に基づいて、前記被測定物中の褐色脂肪組織、ベージュ脂肪、及び白色脂肪の存在の有無を判断する請求項1又は2記載の分析装置。
- 前記第2の判断部は、刺激が付与された被測定物中の中性脂肪量との相関を示すデータを保有し、当該データと前記第1の判断部で判断された前記中性脂肪量とに基づいて、前記刺激が付与された前記被測定物中の前記褐色脂肪組織量或いは前記ベージュ脂肪量を判断する請求項1~3のいずれか一項記載の分析装置。
- 波長900nm帯の光を含む計測光を被測定物に向けて照射する光照射ステップと、
前記被測定物からの反射光を検出し、前記被測定物における前記反射光のスペクトルデータを取得する光検出ステップと、
前記光検出ステップで取得された前記スペクトルデータにノイズ除去処理を施すデータ処理ステップと、
中性脂肪量の予測に関するPLS回帰モデルを用い、前記ノイズ除去処理が施された前記スペクトルデータを前記PLS回帰モデルに適用することにより、前記被測定物中の中性脂肪量を判断する第1の判断ステップと、
被測定物中の中性脂肪量との相関を示すデータを用い、当該データと前記第1の判断ステップで判断された前記中性脂肪量とに基づいて、前記被測定物中の褐色脂肪組織量或いはベージュ脂肪量を判断する第2の判断ステップとを備える分析方法。 - 前記PLS回帰モデルとして、前記ノイズ除去処理が施された前記スペクトルデータにおける脂肪の吸収ピークの値に基づくモデルを用いる請求項5記載の分析方法。
- 前記第1の判断ステップでは、前記ノイズ除去処理が施された前記スペクトルデータにおける波長900nm帯の水の吸収ピークの有無に基づいて、前記被測定物中の褐色脂肪組織、ベージュ脂肪、及び白色脂肪の存在の有無を判断する請求項5又は6記載の分析方法。
- 前記第2の判断ステップでは、刺激が付与された被測定物中の中性脂肪量との相関を示すデータを用い、当該データと前記第1の判断ステップで判断された前記中性脂肪量とに基づいて、前記刺激が付与された前記被測定物中の前記褐色脂肪組織量或いは前記ベージュ脂肪量を判断する請求項5~7のいずれか一項記載の分析方法。
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