By Roger P. Harrie, Cynthia J. Kendall
With 308 case reviews, coupled with greater than 370 ultrasound photos, Roger P. Harrie’s medical Ophthalmic Echography is an necessary sensible advisor on how one can use ultrasound quick and reliably to spot eye problems. This handbook serves not just as an outstanding procedural overview, but in addition as a superb "how-to" for clinicians new to ultrasound.
Chapters disguise an array of ocular and orbital issues of which a sufferer might current, together with vitreo-retinal affliction, anterior section difficulties, vascular lesions, and swollen discs. Dr. Harrie attracts upon his vast adventure within the ophthalmologic box and imparts his services in chapters that diversity from the overview of the painful eye, to easy rules of ultrasound, to echography in constructing nations. the various case experiences contained in the chapters contain a spectrum of sufferers throughout a long time and scientific stipulations. The stories light up the accuracy with which echography either photos intraocular and orbital buildings and provides beneficial details at the prestige of the lens, vitreous, retina, choroid, sclera, and orbital buildings. The e-book additionally illustrates how ultrasound is used for diagnostic reasons while pathology is clinically noticeable, resembling differentiating iris and ciliary physique lesions, ruling out choroidal and retinal detachments, differentiating intraocular tumors, comparing serous as opposed to hemorrhagic choroidal detachments, and settling on the reason for the proptotic eye. all through, the publication emphasizes that echography is a value powerful and useful extension of the clinician’s diagnostic strength. an in depth exhibit of A-scan pictures illustrates the precious addition this modality presents to the extra popular B-scan pictures.
With its case-based process, concise procedural guide, and broad references, this functional guide will turn out worthy within the busy medical setting.
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Additional resources for Clinical Ophthalmic Echography: A Case Study Approach
The surface spike is maximized and the greatest thickness is measured. 0 mm in thickness, the B-scan will detect them but the A-scan will not unless directed by the B-scan (Fig. 61). Once the lesion is characterized topographically, the A-scan is directed in that location to character- Fig. 59. B-scan showing calcification (arrow) Fig. 60. Top: B-scan of lesion using transverse probe position (arrow). Bottom: B-scan of lesion using longitudinal probe position (long arrow). Optic nerve (short arrow) ize internal structure.
Left: B-scan of calcified optic disc drusen in the right eye (arrow). 6 Four types of retinal hemorrhages have been described: (1) splinter nerve fiber layer hemorrhages at the disc; (2) hemorrhages of the optic nerve head extending into the vitreous; (3) deep papillary hemorrhages; and (4) deep peripapillary hemorrhages with or without extension into the macula. Tiny calcifications are easily missed on radiologic studies. Echography is more sensitive than routine CT scans in the presence of faint calcium deposition such as with small buried drusen.
It is difficult to be certain that the sound beam of an A-scan biometer is congruent with the fovea on the sloping side of a staphyloma. However, with a combined A-and B-scan unit, the B-scan can be used to image the macula and then the vector A-scan superimposed on it (Fig. 39). Roldivar states that the accuracy of this technique is questionable as the 55 Fig. 38. Top: B-scan with superimposed vector A-scan of choroidal melanoma (vertical arrows). Bottom: Standardized A-scan of the same tumor demonstrating typical internal reflectivity (vertical arrows) Fig.