WO2016080442A1 - 品質評価方法及び品質評価装置 - Google Patents
品質評価方法及び品質評価装置 Download PDFInfo
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Definitions
- the present invention relates to a cell mass quality evaluation method and a quality evaluation apparatus.
- Patent Document 1 discloses a configuration in which a time series image of a cell mass is acquired and evaluated for the purpose of determining the maturity of the cell mass.
- Patent Document 2 discloses a configuration in which a fluorescent image is taken after fluorescent staining of a cell mass, and evaluation is performed based on the fluorescent image.
- Patent Documents 1 and 2 have not been studied for nondestructive evaluation of cell mass quality such as cell mass activity and activity.
- the present invention has been made in view of the above, and an object thereof is to provide a quality evaluation method and a quality evaluation apparatus capable of nondestructively evaluating the quality of a cell mass.
- a quality evaluation method includes: (1) An acquisition step of acquiring spectral data relating to transmitted light or diffuse reflected light from the cell mass by irradiating the cell mass with measurement light including near infrared light; An evaluation step for evaluating the quality of the cell mass based on the spectrum data of the cell mass obtained in the obtaining step; Is a quality evaluation method.
- spectrum data is data composed of light intensities at a plurality of wavelengths.
- the quality evaluation apparatus includes: (2) a light source for irradiating measurement light including near infrared light to a cell mass; A light receiving unit for obtaining spectrum data relating to the cell mass by receiving transmitted light or diffuse reflected light from the cell mass emitted by irradiation of the measurement light from the light source; Based on the spectral data received in the light receiving unit, an analysis unit for evaluating the quality of the cell mass, It is a quality evaluation apparatus provided with.
- a quality evaluation method and a quality evaluation apparatus capable of nondestructively evaluating the quality of a cell mass are provided.
- SVM support vector machine
- the quality evaluation method of this application is (1) An acquisition step of acquiring spectrum data relating to transmitted light or diffuse reflected light from the cell mass by irradiating the cell mass with measurement light including near infrared light, and acquired in the acquisition step And an evaluation step for evaluating the quality of the cell mass based on the spectrum data of the cell mass.
- a quality evaluation method in order to obtain spectrum data relating to transmitted light or diffuse reflected light and evaluate the quality of the cell mass based on the spectrum data, the quality of the cell mass is evaluated nondestructively. Is possible.
- the quality of the plurality of cell masses can be evaluated based on the variation in spectrum data of the plurality of cell masses acquired in the acquisition step.
- the spectral data of a plurality of cell clusters vary, and based on this, the quality of the cell clusters for each culture vessel can be evaluated with higher accuracy.
- the quality of the cell mass is evaluated by comparing the spectrum data of the cell mass acquired in the acquisition step with the reference spectrum data acquired separately from the acquisition step. It can be. Evaluation with high accuracy is possible by evaluating the quality of the cell mass by comparison with the reference spectrum data.
- the evaluation step by comparing the intensity of transmitted light or diffuse reflection light at a specific wavelength included in the spectrum data of the cell mass acquired in the acquisition step with a preset threshold value, It can be set as the aspect which evaluates quality. When the quality is evaluated by comparing with the threshold value, the quality can be evaluated more easily.
- a plurality of spectrum data related to transmitted light or diffuse reflected light related to the cell mass are acquired over time, and in the evaluation step, a plurality of spectrums of the cell mass acquired in the acquisition step
- the quality of the cell mass can be evaluated on the basis of the change with time of the data. In such a configuration, since the time-dependent change of the cell mass can be confirmed from the spectrum data, the quality can be accurately evaluated.
- the evaluation step for the spectrum data of the cell mass acquired in the acquisition step, by using multi-variate analysis using reference spectrum data having a quality obtained separately from the acquisition step, It can be set as the aspect which evaluates the quality of a cell mass. By using multivariate analysis, quality can be evaluated with high accuracy.
- the quality evaluation device of the present application is (9) receiving a light source that irradiates the cell mass with measurement light including near-infrared light, and receiving transmitted light or diffusely reflected light from the cell mass that is emitted by irradiation of the measurement light from the light source. And a light receiving unit that acquires spectrum data related to the cell mass, and an analysis unit that evaluates the quality of the cell mass based on the spectrum data received by the light receiving unit.
- the quality of the cell mass is evaluated nondestructively. Is possible.
- the quality evaluation apparatus 100 is an apparatus that evaluates the quality of the cell mass 3 placed on the moving stage 2.
- the cell mass 3 includes various forms of cells such as a single cell, a one-dimensional mass, a two-dimensional mass, and a three-dimensional mass. It includes cells collected, stem cells prepared based on them, or cells obtained by differentiating stem cells, and those in which a plurality of cell types are mixed. Further, “quality” evaluated by the quality evaluation apparatus 100 indicates “activity”, “activity”, or “safety in the body” of a cell.
- the quality evaluation apparatus 100 receives the transmitted light emitted from the cell mass 3 by irradiating the cell mass 3 with measurement light, which is near infrared light, and acquires spectrum data (acquisition process). Based on the data, the quality of the cell mass 3 is evaluated (evaluation step). For this reason, the quality evaluation apparatus 100 includes a light source 10, a detection unit 20, and an analysis unit 30 (evaluation unit).
- the quality evaluation apparatus 100 includes a light source 10, a detection unit 20, and an analysis unit 30 (evaluation unit).
- near infrared light is used for spectroscopic measurement will be described. However, at least a part of near infrared light may be included as measurement light, and light in other wavelength ranges may be used. It may be used for measurement.
- the light source 10 irradiates measurement light including near infrared light toward a predetermined area provided on the moving stage 2.
- the wavelength range of the measurement light irradiated by the light source 10 is appropriately selected depending on the cell mass 3.
- the measurement light specifically, light having a wavelength range of 800 nm to 2500 nm is used, and in particular, light having a wavelength of 1000 nm to 2300 nm is used. Since near-infrared light in these wavelength regions has vibration absorption (overtones and coupled sounds) of substances, the characteristics of the cell mass 3 that is the measurement object can be obtained by combining them.
- near-infrared measurement light it is possible to perform measurement using light in a wavelength range different from the absorption band of water.
- spectral data acquired using light in a wavelength range of 1500 nm to 1900 nm may be used for evaluation.
- this embodiment demonstrates the light source 10 which consists of a halogen lamp, the kind of light source 10 is not specifically limited.
- the light source 10 generates measurement light L1 including near infrared light and emits it toward the opening 2A of the moving stage 2 where the cell mass 3 is provided.
- the light source 10 may include a waveguide optical system such as an optical fiber for irradiating the cell mass 3 with measurement light.
- the measurement light L1 output from the light source 10 passes through the cell mass 3 accommodated in the container 3A on the opening 2A. A part of the light enters the detection means 20 as transmitted light L2.
- the detection means 20 has a function as a hyperspectral sensor that acquires a hyperspectral image by a sensor arranged in two dimensions.
- the hyperspectral image in this embodiment is demonstrated using FIG.
- FIG. 2 is a diagram for explaining the outline of the hyperspectral image.
- the hyperspectral image is an image composed of N unit regions P 1 to P N.
- FIG. 2 specifically shows two unit regions P n and P m as an example of them.
- the unit areas P n and P m include spectral information S n and S m each including a plurality of intensity data.
- the intensity data is data indicating a spectral intensity at a particular wavelength (or wavelength band), 2, 15 intensity data has been held as the spectral information S n and S m, superposition of these It is shown in the state.
- the hyperspectral image H has a plurality of intensity data for each unit region constituting the image, so that a three-dimensional image having both a two-dimensional element as an image and an element as spectral data. It is data of a typical structure.
- the hyperspectral image H refers to an image having intensity data in at least five wavelength bands per unit area.
- the cell mass 3 is also shown. That, Pn in FIG. 2 is a unit area of the captured cell mass 3, the P m is a unit area on the background (e.g., container 3A).
- the detection means 20 acquires not only the cell mass 3 but also an image obtained by imaging the background.
- the detection means 20 includes an objective lens 21, a slit 22, a spectroscopic element 23, and a light receiving unit 24.
- a lens barrel 25 is provided between the objective lens 21 and the slit 22.
- the slit 22 is provided with an opening in one direction (direction intersecting the paper surface).
- the transmitted light L 2 that has passed through the lens barrel 25 from the objective lens 21 of the detection means 20 and entered the slit 22 enters the spectroscopic element 23.
- the spectroscopic element 23 splits the transmitted light L2 in a direction perpendicular to the longitudinal direction of the slit 22.
- the light split by the spectroscopic element 23 is received by the light receiving unit 24.
- the light receiving unit 24 includes a light receiving surface in which a plurality of light receiving elements are two-dimensionally arranged, and each light receiving element receives light. Thereby, in the area
- the light receiving elements arranged in the direction to receive light respectively receive light.
- Each light receiving element outputs a signal corresponding to the intensity of received light as information on a two-dimensional planar point composed of a position and a wavelength.
- a signal output from the light receiving element of the light receiving unit 24 is sent from the detecting unit 20 to the analyzing unit 30 as spectral data for each unit region related to the hyperspectral image.
- the analyzing means 30 acquires the spectrum data of the transmitted light L2 from the input signal, and evaluates the cell mass 3 using the spectrum data.
- the analysis means 30 includes a CPU (Central Processing Unit), a main memory RAM (Random Access Memory) and ROM (Read Only Memory), a communication module that performs communication with other devices such as the detection means 20, In addition, it is configured as a computer including hardware such as an auxiliary storage device such as a hard disk. And the function as the analysis means 30 is exhibited when these components operate
- CPU Central Processing Unit
- main memory RAM Random Access Memory
- ROM Read Only Memory
- the above-described quality evaluation apparatus 100 can acquire a so-called one-dimensional spectrum image of a region along the extending direction of the slit by one imaging. Therefore, by moving the moving stage 2 on which the cell mass 3 is placed, or moving the imaging region by the quality evaluation apparatus 100, the spectrum data for the entire cell mass 3 can be acquired.
- the analysis means 30 separately from the measurement of the spectrum data related to the cell mass 3, an incident light spectrum related to the incident light without the cell mass 3 is acquired in advance, and the incident light spectrum and the transmitted light L ⁇ b> 2 of the cell mass 3 are obtained. From the difference from the spectrum data, the spectrum data (transmission spectrum) related to the transmitted light derived from the cell mass 3 can be obtained. The cell mass 3 is evaluated using this transmission spectrum.
- a plurality of cell masses 3 are accommodated in one plate (culture vessel). Therefore, when evaluating the quality of a cell mass, rather than evaluating each cell mass one by one, a plurality of cell masses accommodated in one plate (culture container) are collectively evaluated.
- Such an evaluation method is often employed in the field of regenerative medicine. In the following description of the evaluation method, both the evaluation method in units of 3 cell clusters and the evaluation method in plate units will be described.
- non-defective product and “defective product”
- quality evaluation a case where the cell mass to be evaluated is classified into two parts.
- the evaluation When the evaluation is performed for each cell mass 3, by performing processing such as averaging with respect to a plurality of transmission spectra acquired for one cell mass 3, it is compared with the good spectrum data acquired as a reference spectrum. It is possible to evaluate whether the product is good or defective.
- the reference spectrum for the intensity of transmitted light at a specific wavelength included in the spectrum data.
- a threshold value may be set in advance for the intensity of transmitted light at a specific wavelength included in spectrum data, and the quality of the cell mass may be evaluated based on the threshold value. . In this case, since the reference spectrum is not used, the evaluation can be performed more easily.
- a transmission spectrum of the cell mass 3 is acquired every elapsed time (for example, about 36 to 48 hours every 6 to 10 hours), and the cell mass 3 It can also be set as the structure which evaluates quality.
- the quality can be accurately evaluated.
- it since there are various methods for evaluating the quality based on the transmission spectrum of the cell mass 3, it can be appropriately selected according to the type and state of the cell mass to be evaluated.
- the first method after measuring the spectrum related to the plurality of cell clusters 3 accommodated in the same plate and obtaining the transmission spectra, respectively, after performing processing such as averaging, One spectrum data used for evaluation is calculated. And quality can be evaluated using the method similar to evaluation for every above-mentioned cell mass 3, such as a method of comparing the spectrum data with a reference spectrum, for example.
- spectrum data relating to a plurality of cell masses 3 accommodated in the same plate is acquired and transmission spectra are obtained, and then evaluation is performed using these.
- a method of determining whether or not the product is a non-defective product based on whether or not the transmission spectrum variation (standard deviation) of the plurality of cell masses 3 accommodated in the same plate is within a predetermined threshold is used. Can do.
- FIG. 3 is a diagram showing variations in transmission spectra for a plurality of cell cluster 3 plates including only non-defective products and a plurality of cell cluster 3 plates including defective products.
- the spectrum was measured by the method shown in the above embodiment for each of eight cell clusters in the plate (culture vessel), and the average and standard deviation of the transmission spectrum were obtained for each plate with respect to the obtained transmission spectrum.
- FIG. 3 shows average spectra, + ⁇ and ⁇ for each of the non-defective product plate and the defective product plate.
- the integrated standard deviation of the transmission spectrum obtained by measuring the cell mass of the non-defective plate was 1.1, whereas The integrated standard deviation of the transmission spectrum obtained by measuring the cell mass was 11.1.
- the integrated standard deviation of the transmission spectrum obtained by measuring the cell mass was 11.1.
- the spectrum data used for evaluation is prepared from one or more spectrum data concerning one cell mass 3.
- the spectrum data used for evaluation is prepared from one or more spectrum data concerning the cell cluster of the target plate.
- the reference spectral data used for multivariate analysis is a plurality of spectral data acquired from cell masses of known quality. For example, when it is desired to determine whether the product is non-defective / defective, spectral data of good and defective products is prepared. Thus, reference spectrum data is prepared according to the quality to be evaluated. Examples of multivariate analysis include, but are not limited to, principal component analysis, regression analysis, factor analysis, and the like.
- principal component analysis is performed using reference spectrum data to identify one or more principal components that are affected by quality, and each principal component corresponding to the quality is identified. Specify the component score range. That is, by performing principal component analysis, spectrum data of cell masses having different qualities can be classified according to the score value of the principal component. Thereafter, for the spectrum data relating to the cell mass to be evaluated, the score of each principal component is calculated, and based on the calculated score value of the principal component, it is possible to determine the quality of the cell mass to be evaluated it can.
- FIG. 4 is a result of plotting each spectrum data based on the score of each principal component, with the first principal component obtained as a result of the principal component analysis as the horizontal axis and the second principal component as the vertical axis. As shown in FIG.
- a non-defective product / defective product can also be determined by calculating the score of the first principal component for the evaluation target cell mass whose quality is unknown.
- FIG. 5 is a result of plotting each spectrum data based on the score of each principal component, with the first principal component obtained as a result of the principal component analysis on the horizontal axis and the third principal component on the vertical axis. As shown in FIG.
- the scores of the first principal component and the third principal component change according to the culture period after induction. Specifically, it was confirmed that the score of the first principal component is biased depending on whether it is 5 weeks or 2.3 weeks. In addition, it was confirmed that the scores of the third main component were biased between 2 weeks and 3 weeks. Therefore, for the cells to be evaluated (cell mass) whose culture period is unknown, the culture period as quality can be estimated by calculating the scores of the first principal component and the third principal component.
- FIG. 6 is a result of plotting each spectrum data based on the score of each principal component, with the first principal component obtained as a result of the principal component analysis on the horizontal axis and the third principal component on the vertical axis. As shown in FIG. 6, it was confirmed that there was a bias in the score of the first main component according to the life or death of the cells. Therefore, it is possible to discriminate between life and death by calculating the score of the first principal component for cells (cell mass) whose life and death are unknown.
- the spectrum data used for evaluation is prepared from one or more spectrum data concerning one cell mass 3.
- the spectrum data used for evaluation is prepared from one or more spectrum data concerning the cell cluster of the target plate.
- the reference spectrum data used for machine learning pattern recognition is a plurality of spectrum data acquired from cell masses of known quality as in the case of multivariate analysis. For example, when it is desired to determine whether the product is non-defective / defective, spectral data of good and defective products is prepared. Thus, reference spectrum data is prepared according to the quality to be evaluated.
- machine learning pattern recognition include, but are not limited to, a support vector machine (SVM), a kernel method, a Bayesian network method, and the like.
- a standard for classifying different qualities is calculated using reference spectrum data.
- the identification surface is a reference for classification.
- a new space for quality evaluation may be defined and a standard in the space may be defined.
- FIG. 7 shows the result of plotting the score (distance from the identification plane) related to the reference spectrum data as a histogram. As shown in FIG. 7, it was confirmed that the score varied depending on the culture period after induction. Therefore, the estimation of the culture period as the quality can be performed by calculating the feature amount of the cell (cell mass) to be evaluated whose culture period is unknown.
- spectrum data relating to transmitted light or diffuse reflected light obtained by irradiating the cell mass 3 with measurement light including near-infrared light is used.
- a configuration for performing quality evaluation based on this it is possible to perform quality evaluation of a cell mass in a non-destructive and non-invasive manner.
- near-infrared light it is possible to obtain the characteristics of the composition by a combination of vibration absorption (overtone, coupled sound) of the substance, etc., and to capture the concentration change. Therefore, quality evaluation with high accuracy can be realized.
- the quality evaluation apparatus and the quality evaluation method according to the present invention are not limited to the above embodiment.
- the spectroscopic measurement apparatus is not limited to the configuration including the light source 10, the detection unit 20, and the analysis unit 30 as in the above embodiment, and the configuration can be changed as appropriate.
- the quality evaluation apparatus 100 assigns wavelength information to the pixels in which a plurality of two-dimensionally arranged pixels are arranged in the first direction, and the second orthogonal to the first direction.
- a so-called hyperspectral image can be obtained in which the pixel arrayed in the direction of each is assigned with the position information of the measurement object, and the spectrum data of each unit region along the second direction can be obtained.
Abstract
Description
(1) 細胞塊に対して近赤外光を含む測定光を照射することにより、当該細胞塊からの透過光又は拡散反射光に係るスペクトルデータを取得する取得工程と、
前記取得工程において取得された前記細胞塊のスペクトルデータに基づいて、前記細胞塊の品質を評価する評価工程と、
を有する品質評価方法
である。ここで、「スペクトルデータ」とは、複数の波長における光の強度からなるデータのことである。
(2)細胞塊に対して近赤外光を含む測定光を照射する光源と、
前記光源からの前記測定光の照射によって出射される前記細胞塊からの透過光又は拡散反射光を受光することで当該細胞塊に係るスペクトルデータを取得する受光部と、
前記受光部において受光された前記スペクトルデータに基づいて、前記細胞塊の品質を評価する分析部と、
を備える品質評価装置
である。
最初に本願発明の実施態様を列記して説明する。
(1)細胞塊に対して近赤外光を含む測定光を照射することにより、当該細胞塊からの透過光又は拡散反射光に係るスペクトルデータを取得する取得工程と、前記取得工程において取得された前記細胞塊のスペクトルデータに基づいて、前記細胞塊の品質を評価する評価工程と、を有する。このような品質評価方法によれば、透過光又は拡散反射光に係るスペクトルデータを取得して当該スペクトルデータに基づいて細胞塊の品質を評価するため、細胞塊の品質を非破壊で評価することが可能となる。
(9)細胞塊に対して近赤外光を含む測定光を照射する光源と、前記光源からの前記測定光の照射によって出射される前記細胞塊からの透過光又は拡散反射光を受光することで当該細胞塊に係るスペクトルデータを取得する受光部と、前記受光部において受光された前記スペクトルデータに基づいて、前記細胞塊の品質を評価する分析部と、を備える。このような品質評価装置によれば、透過光又は拡散反射光に係るスペクトルデータを取得して当該スペクトルデータに基づいて細胞塊の品質を評価するため、細胞塊の品質を非破壊で評価することが可能となる。
本発明に係る品質評価方法及び品質評価装置の具体例を、以下に図面を参照しつつ説明する。なお、本発明はこれらの例示に限定されるものではなく、特許請求の範囲によって示され、特許請求の範囲と均等の意味及び範囲内での全ての変更が含まれることが意図される。
Claims (9)
- 細胞塊に対して近赤外光を含む測定光を照射することにより、当該細胞塊からの透過光又は拡散反射光に係るスペクトルデータを取得する取得工程と、
前記取得工程において取得された前記細胞塊のスペクトルデータに基づいて、前記細胞塊の品質を評価する評価工程と、
を有する品質評価方法。 - 前記取得工程において、培養容器に収容された複数の細胞塊からの透過光又は拡散反射光に係るスペクトルデータをそれぞれ取得し、
前記評価工程において、前記取得工程において取得された前記複数の細胞塊のスペクトルデータに基づいて、前記複数の細胞塊の品質を前記培養容器毎に評価する請求項1記載の品質評価方法。 - 前記評価工程において、前記取得工程において取得された前記複数の細胞塊のスペクトルデータのばらつきに基づいて、前記複数の細胞塊の品質を評価する請求項2記載の品質評価方法。
- 前記評価工程において、前記取得工程において取得された前記細胞塊のスペクトルデータと、前記取得工程とは別に取得された参照スペクトルデータとを比較することで前記細胞塊の品質を評価する請求項1又は2に記載の品質評価方法。
- 前記評価工程において、前記取得工程において取得された前記細胞塊のスペクトルデータに含まれる特定波長における透過光又は拡散反射光の強度を予め設定された閾値と比較することによって前記細胞塊の品質を評価する請求項1又は2に記載の品質評価方法。
- 前記取得工程において、前記細胞塊に係る透過光又は拡散反射光に係るスペクトルデータを経時的に複数取得し、
前記評価工程において、前記取得工程において取得された複数の前記細胞塊のスペクトルデータの経時変化に基づいて、前記細胞塊の品質を評価する請求項1又は2に記載の品質評価方法。 - 前記評価工程において、前記取得工程において取得された前記細胞塊のスペクトルデータに対して、前記取得工程とは別に得た品質が既知の参照スペクトルデータを用いて、多変量解析によって、前記細胞塊の品質を評価する請求項1又は2に記載の品質評価方法。
- 前記評価工程において、前記取得工程において取得された前記細胞塊のスペクトルデータに対して、前記取得工程とは別に得た品質が既知の参照スペクトルデータを用いて、機械学習パターン認識によって、前記細胞塊の品質を評価する請求項1又は2に記載の品質評価方法。
- 細胞塊に対して近赤外光を含む測定光を照射する光源と、
前記光源からの前記測定光の照射によって出射される前記細胞塊からの透過光又は拡散反射光を受光することで当該細胞塊に係るスペクトルデータを取得する受光部と、
前記受光部において受光された前記スペクトルデータに基づいて、前記細胞塊の品質を評価する分析部と、
を備える品質評価装置。
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EP15860167.4A EP3222997A4 (en) | 2014-11-21 | 2015-11-18 | Quality evaluation method and quality evaluation device |
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