PubMed · 9039758
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L C Phin, K J Maxted, W Richardson, J Macleod. 1996. Video endoscopy testbox.. https://doi.org/10.1007/bf02523860
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BACKGROUND: There are several CAS-systems in use in modern endonasal sinus surgery. The VectorVision Compact is the first optoelectrical system especially designed for such surgery. This paper investigates its reliability and practicability. PATIENTS AND METHODS: The system was used for intraoperative navigation in 60 patients suffering from chronic rhinosinusitis. The accuracy was measured by visual estimation and compared with other navigated systems. RESULTS: The accuracy was 1.9 mm which is comparable to other systems on the market. Navigation was successful and reliable in 83.3% of the patients. Problems occurred mainly due to loss of sight of the referencing balls and when using other surgical instruments. CONCLUSION: The VectorVision Compact was adequate for endonasal sinus surgery. Further improvements incorporating various surgical instruments should broaden its clinical usefulness.
BACKGROUND: The availability of an electronic radial scanning echoendoscope has facilitated the clinical use of tissue harmonic imaging. This study compares the quality of US images acquired by tissue harmonic imaging during electronic radial scanning EUS to those acquired by fundamental imaging. METHODS: Electronic radial scanning EUS was performed in 108 patients with pancreatic lesions (58 cystic, 50 solid). US images acquired by fundamental imaging at a frequency of 7.5 MHz were compared with those acquired by tissue harmonic imaging by using transmitting and receiving frequencies of, respectively, 4.0 and 8.0 MHz at the same scanning plane. Cystic lesions were evaluated for boundary/septum and nodules, and solid lesions, for boundary and internal structure. US images acquired by tissue harmonic imaging and fundamental imaging during electronic radial scanning EUS were compared, by using a Likert scale for the respective evaluation criteria, by two independent endoscopists. OBSERVATIONS: For cystic lesions, tissue harmonic images were significantly clearer than fundamental images for visualizing boundary and septum (p < 0.0001, both reviewers) and nodules (p = 0.0003, Reviewer 1; p = 0.0007, Reviewer 2). For solid lesions, tissue harmonic images were significantly clearer than fundamental images for visualizing boundary (p = 0.0003, Reviewer 1; p < 0.0001, Reviewer 2) and internal structures (p = 0.0003, Reviewer 1; p = 0.0009, Reviewer 2). CONCLUSIONS: US images acquired by tissue harmonic imaging appear to be clearer compared with those acquired by fundamental imaging.
We present a video-endoscopic technology for foreign body extractions with forceps. This can easily be followed and is recordable on video monitor in excellent quality. Instead of a rigid rod lens telescope, a fiberoptic video endoscope is inserted into the optical channel of a bronchoscopic forceps. This keeps the endoscopic device lightweight and easily maneuverable in different angles. The principle can be applied to other rigid diagnostic and therapeutic endoscopic equipment and represents a potential alternative technology to the use of cameras attached to rigid telescopes.