PubMed · 16212027
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Thea Philliou. 2005. Radiation detection.. https://pubmed.ncbi.nlm.nih.gov/16212027/
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We improved our recently reported retinal OCT system based on transverse priority scanning to achieve high resolution in both the transverse and the axial directions. The implementation of an additional SLO channel enables precise on-line focusing. The system enables imaging of the human retinal cone mosaic off the foveal center without adaptive optics. We demonstrate, for what is believed to be the first time, cone mosaic imaging simultaneously in the scanning laser ophthalmoscope and optical coherence tomography (OCT) channels. OCT B-scan images demonstrate that the cone mosaic is observable in two adjacent layers. Furthermore, we present what are believed to be the first C-scan OCT images of the cone mosaic and show that the major part of light backscattered from below the photoreceptor layer is not guided back toward the pupil by the photoreceptors.
We report a Koehler-illumination-based full-field, actively stabilized, low-coherence phase-shifting interferometer, which is built on a white-light Michelson interferometer. By using a phase-stepping technique we can obtain full-field phase images of the sample. An actively stabilized phase-lock circuit is employed in the system to reduce phase noise. An application to human epithelial cells (HeLa cells) is achieved in our experiment. The advancement of this technique rests in its ability to take images of unstained biological samples quantitatively and on a nanometer scale.
Anastomotic leakage is a serious problem in the laparoscopic resection of rectal cancer. Although stapling devices and techniques for colorectal or coloanal anastomosis have been improved, laparoscopic anastomosis is still technically difficult and the rate of leakage is high. To resolve this problem, a new stapling device (the Contour Curved Cutter Stapler) for open surgery was applied to the laparoscopic resection of rectal cancer. After intracorporeal mobilization and vessel ligation, a 6-cm Pfannenstiel incision was made to insert the device into the peritoneal cavity, and a hand access device was placed on the site. The head of the device was put through a cutoff of the middle finger of a surgical glove, after which the wrist of the glove was attached to the hand access device. To prevent leakage of CO2 gas through the gap between the shaft and the glove, the shaft covered by the glove was tied, and the gap was filled with bone wax. After re-creation of the pneumoperitoneum, the rectum was transected with the stapling device, and the anastomosis was accomplished by the double stapling technique. This technique enabled a reliable transection of the rectum because of the easy handling of the device and the wide laparoscopic view of the lower rectum in the deep pelvis.