Read e-book online Ophthalmic Echography: Proceedings of the 10th SIDUO PDF

By J. M. Thijssen (auth.), K. C. Ossoinig (eds.)

ISBN-10: 9400933150

ISBN-13: 9789400933156

ISBN-10: 9401079889

ISBN-13: 9789401079884

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Read or Download Ophthalmic Echography: Proceedings of the 10th SIDUO Congress, St. Petersburg Beach, Florida, U.S.A., November 7–10, 1984 PDF

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Additional resources for Ophthalmic Echography: Proceedings of the 10th SIDUO Congress, St. Petersburg Beach, Florida, U.S.A., November 7–10, 1984

Sample text

Thesis, University of Bonn, Med. Faculty 1984. 2. Lepper R-D, Trier HG, Reuter R 1980. Neuartige Ultraschallbiometrie. Klin. Mbl. Augenheilk. 177: 101-108. The results of this study were taken from thesis [2J; the statistical evaluation was advised by PD Dr. med. Gisela Hildenbrand. method of ultrasonography [3] for the procedure of axial length determination. Immersion axial length determination has several theoretical advantages [1, 4, 5, 6, 8], although a large clinical series utilizing this technique has not been available for comparison.

1. 2. 3. 4. 1. 2. 3. 4. r:--LJ . r- -' - .... I: U --,--_ ,- - - .... •. -J: I '-' I 9. ate 5 • -:- ~ -' ~ ti~s _ _ _. I . . - - hi stogram Fig. 2, Scheme of principles of electronic system to evaluate A-mode for biometry: Level crossings of echo spikes within gates yield time events which are employed to read-out an electronic counter, Lower trace: histogram display of time measurements, The electronic devices can be divided in the following categories (cf. Tables 2, 3). 1. The equipment may employ just two gates, which can be set around two selectable echopeaks.

G. 50 ms). The advantage of averaging the measurements is obvious, but the displayed histograms cannot substitute the A-mode echogram. 4. A rather simple device'is developed from thickness gauges used for nondestructive testing. It consists of two gates and the counter information is numerically displayed either in microseconds, or in millimeters. Although 5 some pattern recognition may be built in to enhance the reliability of the measurement, no real adequate control of the beam alignment is present.

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Ophthalmic Echography: Proceedings of the 10th SIDUO Congress, St. Petersburg Beach, Florida, U.S.A., November 7–10, 1984 by J. M. Thijssen (auth.), K. C. Ossoinig (eds.)


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