Joint expertise from industry and research: New regulations standardize optical coherence tomography
Optical coherence tomography (OCT) is a groundbreaking imaging technique that generates high-resolution cross-sectional images of transparent and semitransparent media. It is used both in industrial metrology, for example in quality assurance, and in biomedical diagnostics, such as ophthalmology or tissue diagnostics. Companies and research institutes focusing on industrial metrology and medical technology also expect a wide range of other fields of application. They cooperate in the VDI/VDE - Society for Measurement and Automatic Control (GMA) in an expert committee on OCT. They have recently published the guideline VDI/VDE 5565 part 1 with standardized process descriptions.
The technical committee 1.32 "Optical Coherence Tomography" goal in GMA's "Methodology of Measurement and Sensor Technology" division is to bring together expertise from industry and research and thus open the way for further OCT application fields in the future. The basis for using OCT in biomedical diagnostics and beyond is set by the standards published by the committee in January 2023.
So far, the comparatively new measurement method has not yet been described in a generally valid manner, and various procedures and performance characteristics have not yet been standardized. Thus, the comparability of different OCT systems was not given, and broader dissemination was limited. This is now to change through the standardization work of the technical committee.
"During the development of the technical regulations, we focused on the users and their specific requirements. The definition of terms and measurement methods or the description of typical variants of OCT methods creates an urgently needed uniformity. This is a basis for using OCT in different fields of application," explains Niels König, head of the Production Measurement Technology department at the Fraunhofer Institute for Production Technology IPT in Aachen and chairman of the expert committee.
High-resolution imaging: enabler for multiple applications in biomedicine and beyond
Initially used in ophthalmology, OCT is a measurement technique based on low-coherence interferometry for non-contact and high-resolution imaging of tomographic cross-sectional images. It has a penetration depth of several millimeters and a resolving power in the single-digit micrometer range. In medical diagnostics, OCT can be used to examine organic tissue, such as tumor tissue at a very early stage of disease, either intraoperatively or in vitro. OCT is a technology that brings the potential to improve imaging in all medical disciplines - from minimally invasive surgery to neurosurgery and cardiology.
But thanks to its universal properties, OCT is also used in industry for material and defect testing, such as plastic products. In the case of opaque materials into which light cannot penetrate, for example metal, OCT is used for surface and distance measurement.
In January 2023, the guideline VDI/VDE 5565 Part 1 "Optical Coherence Tomography (OCT); Process Descriptions" was published in a bilingual edition (German/English) (www.vdi.de/5565). The guideline describes the OCT procedures and defines the necessary terms. The committee is already working on VDI/VDE 5565 Sheet 2 on "Signal processing and data evaluation".
The guideline VDI/VDE 5565 part 1, "Optical Coherence Tomography (OCT) - Process descriptions," can be ordered from 73.80 EUR at Beuth Verlag, www.beuth.de/en, (Phone: +49 30 2601-2260).
For further information, please contact the GMA office:
Measurement and Automatic Control (GMA)
Phone +49 211 6214-373
www.beuth.de/en - Search term: VDI/VDE 5565