Method for evaluating culture quality

Patent metadata

Field	Value
Publication number	US-9600874-B2
Application number	US-201414275949-A
Country	US
Kind code	B2
Filing date	May 13, 2014
Priority date	Sep 26, 2013
Publication date	Mar 21, 2017
Grant date	Mar 21, 2017

Abstract

A culture quality evaluation method comprises: a first step of culturing a pluripotent stem cell under a predetermined culture condition and creating a sample; a second step of imaging a proliferated cell colony in the sample and accordingly capturing an original image; a third step of dividing the original image into smaller images of a predetermined size and calculating standard deviations of pixel values of pixels of the smaller images; and a fourth step of judging whether the sample is an acceptable sample based upon a ratio of a number of the smaller images whose values of the standard deviations are within a predetermined range to a total number of the smaller images.

First claim

What is claimed is:

1. A culture quality evaluation method, comprising: a first step of culturing a pluripotent stem cell under a predetermined culture condition and thereby creating a sample; a second step of imaging a proliferated cell colony in the sample and accordingly capturing an original image; a third step of dividing the original image into smaller images of a predetermined size and calculating standard deviations of pixel values of pixels contained in each one of the smaller images; and a fourth step of judging that the sample is an acceptable sample when a ratio of a number of the smaller images whose values of the standard deviations are within a predetermined range to a total number of the smaller images is equal to or smaller than a predetermined threshold value and judging that the sample is an unacceptable sample when the ratio is beyond the threshold value, wherein prior to the third step, an image of a pluripotent stem cell, an image of a feeder cell and an image of a differentiated cell differentiated from the pluripotent stem cell are acquired, a first sub step of calculating first standard deviations which are defined as the standard deviations of pixel values contained in each one of smaller images which are obtained by dividing the images, a second sub step of calculating an average value of the first standard deviations calculated on a plurality of smaller images and calculating a second standard deviation which is defined as a standard deviation of the first standard deviations, and a third sub step of identifying a central range which is defined as a range of first standard deviations within which the values of the first standard deviations are equal to or smaller than twice the second standard deviation about the average value are executed on the images while changing the size of the smaller images over multiple levels, and the size of the smaller images to use at the third step is determined as such a size with which the central range in the image of the differentiated cell does not overlap the central range in the image of the pluripotent cell or the central range in the image of the feeder cell under the condition that the smaller images have the same size wherein the steps are executed by one or more processors.

2. The culture quality evaluation method of claim 1 , wherein the culturing is performed using a culture medium which contains a feeder cell at the first step.

3. The culture quality evaluation method of claim 1 , wherein at the fourth step, the smaller images are classified into a plurality of categories in accordance with the values which the standard deviations take, and the smaller images whose values of the standard deviations are within the predetermined range are classified into same category.

4. The culture quality evaluation method of claim 1 , wherein the sample is imaged such that the cell colony is distributed all over the original image at the second step.

5. The culture quality evaluation method of claim 1 , wherein from among the average values and the second standard deviations calculated from the image of the differentiated cell, based upon the average value and the second standard deviation which correspond to the size of the smaller images used at the third step, the predetermined range at the fourth step is determined.

Assignees

• Dainippon Screen Mfg
• Screen Holdings Co Ltd

Inventors

• Fujimoto Hiroki
• Moriwaki Sanzo

Classifications

• G06V10/98

  Detection or correction of errors, e.g. by rescanning the pattern or by human intervention; Evaluation of the quality of the acquired patterns · CPC title

• G06T2207/10056

  Microscopic image · CPC title

• G06T2207/30024

  Cell structures in vitro; Tissue sections in vitro · CPC title

• G06K9/00134

  Physics · mapped topic

• G06T2207/20021

  Dividing image into blocks, subimages or windows · CPC title