Patent ID: 11906301
Assignee: SCREEN HOLDINGS CO., LTD.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 5:
6. A thickness evaluation method of the cell sheet comprising:
capturing a plurality of tomographic images of the cell sheet using optical coherence tomography by causing light to be incident on the cell sheet in a direction intersecting a principal surface of the cell sheet; and
obtaining a thickness distribution of the cell sheet based on a result of the tomography imaging,
wherein the imaging step includes:
scanning repeatedly the light in a main scanning direction while moving an incident position of the light in a sub-scanning direction intersecting the main scanning direction at a feed pitch larger than a size corresponding to one pixel in the tomographic images; and
capturing a tomographic image of the cell sheet at each scan in the main scanning direction, thereby generating the plurality of the tomographic images corresponding to cross-sections at positions different from each other in the sub-scanning direction,

wherein the obtaining step includes:
obtaining one-dimensional thickness distributions of the cell sheet in the corresponding cross-sections based on each of the plurality of tomographic images; and
obtaining a two-dimensional thickness distribution of the cell sheet by interpolating the one-dimensional thickness distributions,

wherein tomographic images in which the main scanning direction and the sub-scanning direction are switched are further imaged, and
wherein the two-dimensional thickness distribution is obtained by two-dimensional interpolation using one-dimensional thickness distributions obtained for the respective tomographic images imaged before and after that switch.