Posts with the tag: surgery
Recently, there has been a lot of interest in the application of optical coherence tomography (OCT) to retinal surgery. While OCT is already established as a tool for diagnosis and pre-surgical planning, the idea of imaging during the surgery itself hasn’t found much traction. Initially, this was partly due to the lack of commercial OCT systems that were well-integrated with ophthalmic microscopes. This meant that the surgery had to be halted, the ophthalmic microscope removed, and the OCT slid into place every time an OCT image was wanted. More recently, Carl Zeiss and Haag-Steit have begun marketing devices where the OCT is integrated into the surgical microscope, so that both can be used simultaneously. The OCT images can then be displayed to the surgeon in the microscope view. However, the authors of a recent paper in Biomedical Optics Express claim that these integrated OCT systems are still not ideal. Instead, they propose an OCT scanner which is built into the surgical instrument itself.
Researchers at the University of Maryland have developed a low-cost fibre sensor for detecting blood flow. It has a diameter of just 125 microns, meaning it could be incorporated into a surgical instrument to alert the operator that they are approaching a blood vessel. It combines features of laser Doppler flowmetry and low coherence interferometry to provide a measurement with high spatial localisation, but without many of the complications of a full Doppler optical coherence tomography (OCT) system.