in the skull. optical coherence tomography is also applicable and increasingly used in industrial applications, such as nondestructive testing (ndt), material thickness measurements, and in particular thin silicon wafers and compound semiconductor wafers thickness measurements surface roughness characterization, surface and cross-section imaging and volume loss measurements. oct systems with feedback can be used to control manufacturing processes. with high speed data acquisition, and sub-micron resolution, oct is adaptable to perform both inline and off-line. due to the high volume of produced pills, an interesting field of application is in the pharmaceutical industry to control the coating of tablets. fiber-based oct systems are particularly adaptable to industrial environments. these can access and scan interiors of hard-to-reach spaces, and are able to operate in hostile environments—whether radioactive, cryogenic, or very hot. novel optical biomedical diagnostic and imaging technologies are currently being developed to solve problems in biology and medicine. as of 2014, attempts have been made to use optical coherence tomography to identify root canals in teeth, specifically canal in the maxillary molar, however, there is no difference with the current methods of dental operatory microscope. research conducted in 2015 was successful in utilizing a smartphone as an oct platform, although much work remains to be done before such a platform would be commercially viable. photonic integrated circuits may be a promising option to miniaturized oct. similarly to integrated circuits silicon-based fabrication techniques can be used to produced miniaturized photonic systems. first in vivo human retinal imaging has been reported recently