Download Clinical Ophthalmic Echography: A Case Study Approach by Roger P. Harrie, Cynthia J. Kendall (auth.) PDF

By Roger P. Harrie, Cynthia J. Kendall (auth.)

The moment editon of this renowned ultrasound ebook expands the reader's figuring out of the scientific functions of ocular ultrasound via a case examine technique. With the addition of high quality video segments of exam options now not at the moment to be had in the other layout, this variation appeals to a broader diversity of practitioners within the box by way of providing the topic beginning on the easy point and progressing to the complicated.

The publication is attractive to practitioners serious about ocular ultrasound, together with ophthalmic technicians, ophthalmologists, optometrists, radiologists and emergency room physicians who, every so often, are excited about the perform of ophthalmic ultrasound.

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Extra info for Clinical Ophthalmic Echography: A Case Study Approach

Sample text

For example, spherical and small foreign bodies create a comet’s tail reverberation artifact and are seen when imaging an IOL loop haptic in cross section. Unique artifacts are seen when scanning a patient with silicone oil as a vitreous substitute. The retina is displayed far to the right making the eye appear extremely myopic. Also the globe shape is unusually flat. These two artifacts are caused by velocity and refraction. The velocity of sound through oil is 2/3 slower than vitreous, so the retina appears farther away.

The patient sought a second opinion from the oculoplastic service at the university medical center. Ultrasound was performed, and no orbital mass was detected by either A- or B-scan. However, there was some subtle flattening of the globe consistent with idiopathic choroidal folds (Fig. 1). However, choroidal folds can be the result of compression of the posterior wall of the globe by an orbital mass. Such lesions can be detected and characterized at the time of the initial examination with timely referral of the patient for directed follow-up studies and optimal management by a specialist.

The amplitude of each spike is related to the strength of the reflection from tissue interfaces from which it is reflected. The B-scan probe (Fig. 4) uses a transducer similar to that of an A probe, but it sweeps back and forth at a rate of 10–25 oscillations per second. It generates sound waves at a frequency of from 10 to 20 MHz (10–20 million cycles per second). The returning echoes are processed to display bright dots on a screen which are combined to generate an image. This generates a series of echoes that are processed like pixels on a computer screen to generate an image.

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