EXPORT CITATION

Chapter-09 Ultrasound Bimicroscopy

BOOK TITLE: Uveitis: Text and Imaging

Author
1. Gupta Amod
2. Gupta Vishali
3. Singh Ramandeep
4. Herbort Carl P
5. Tran Van Tao
ISBN
9788184484915
DOI
10.5005/jp/books/11002_9
Edition
1/e
Publishing Year
2009
Pages
13
Author Affiliations
1. Advanced Eye Centre, Postgraduate Institute of Medical, Education and Research, Chandigarh, India, Postgraduate Institute of Medical, Education and Research, Chandigarh, India
2. Advanced Eye Centre, Postgraduate Institute of Medical Education and Research, Chandigarh (India), King Khaled Eye Specialist Hospital, Riyadh, KSA, Postgraduate Institute of Medical, Education and Research, Chandigarh, India, Postgraduate Institute of Medical, Education and Research (PGIMER), Chandigarh, India
4. University of Lausanne and Inflammatory and Retinal Eye Diseases, Centre for Ophthalmic Specialised Care, Lausanne, Switzerland
5. Centre for Ophthalmic Specialised Care, Lausanne, Switzerland
Chapter keywords
Ultrasound biomicroscope, high frequency transducers, B-mode scanning device, ultrasound biomicroscopy, central processing unit, cilliary body, Radial scans, microscopic resolution, granulomatous uveitis, ultrasound waves

Abstract

Ultrasound biomicroscope technology is based on the use of high frequency transducers incorporated into B-mode scanning device. The ultrasound biomicroscopy (UBM) allows acquiring and viewing real-time high-resolution images of the anterior segment under magnification. Property of high resolution allows for determination of the relationships of structures in vivo without the need for histological specimens. Ultrasound biomicroscopy uses all the essential components similar to conventional B-scan ultrasonography except for higher frequency. UBM is based on hypothesis that by increasing the frequency, greater microscopic resolution can be obtained. The UBM system uses a piezoelectric co-polymer transducer attached to a microprocessor controlled RF signal generator to convert electrical signals into ultrasound waves of a specific high frequency. Ultrasound waves pass through the various tissues of the eye at varying speeds, and are reflected back at different intervals depending on the density of the tissues. Quality of image will depend on the direction of the returning echos. The UBM system consists of central processing unit (CPU) containing signal-processing unit with monitor, transducer, trackball unit, light pen, footswitch, gantry arm for precise motion control and accessories such as eyecups and printer or video. The scans are acquired with the patient lying supine. The scan head is placed directly over the ocular parts to be examined. A large number of anterior ocular tissues can be visualized in living tissue and hence can be compared with the normal to find any ocular pathology. The cilliary body can be seen clearly on UBM. Radial scans will shows radial image through the processes and the scans right angles to it i. e. horizontal scan will display variable configuration of the cilliary processes and the valley between them. UBM has the ability to accurately measure the ocular structures, due to more resolution. Measurements are done on screen using calipers. UBM scans of the iris in uveitis can give information regarding the presence of iris nodules with hypo dense center, especially in granulomatous uveitis.

© 2019 Jaypee Brothers Medical Publishers (P) LTD.   |   All Rights Reserved