Comparison of ophthalmic ultrasonic apparatus.
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Catalogs, Commercial as Topic↗
Biomedical subjects
A L Susal
Publications and source records attributed to A L Susal.
Linear array multiple transducer ultrasonic examination of the eye.
Dynamic ultrasonic imaging adds a time dimension to the clinical diagnosis of ocular pathology. A recent development in this area of ophthalmic sonography has been the introduction of an electronically scanned, multiple transducer system that provides improved real-time imaging of ocular tissue motion. This paper discusses clinical observations made in a variety of ophthalmic conditions with a high speed, linear array ultrasound system and discusses briefly the apparatus and special examination techniques needed to make these observations. Clinical subjects include vitreo-retinal adhesions: the clear cortical vitreous network; vitreous hemorrhage, opacities and membranes; shallow, fixed, and mobile retinal detachments; blood vessels within ocular tumors and the evaluation of intraocular foreign bodies.
Eye Diseases↗
Vascular studies of the orbital cavity.
The orbital cavity is a dynamic region filled with pulsatile vascular structures. Newly developed ultrasonic-imaging equipment enables the physician to study the in-vivo motion of orbital tissues and their blood vessels to obtain pertinent diagnostic information relating to orbital diseases. Evidence of enhanced vascular activity is observed in endocrine ophthalmopathy and other orbital inflammatory conditions. Blood vessels within tumors help to localize the abnormalities and give clues relating to an accurate tissue diagnosis. These examinations are performed repeatedly and noninvasively in a clinical environment.
Humans↗
Small-organ dynamic imaging system.
Dynamic ultrasonic imaging of superficial body organs adds a new dimension to clinical sonographic examinations in that it enables the real-time evaluation of tissue motion and vascular pulsations. A high-frequency (7.2 MHz) linear-array system has been newly developed that generates simultaneous A- and B-mode displays at 60 frames/sec. The instrument produces real-time scan-converted images in standard television format for direct viewing on television (TV) monitors or clinical recording through videotape equipment. Clinical application of this dynamic imaging system has increased the diagnostic capabilities of ultrasound in ophthalmology, radiology, and pediatrics.
Data Display↗
Gray scale echography with simultaneous A mode presentation. A new apparatus for high resolution ultrasonograms.
A diagnostic ultrasonic system has been developed for simultaneous display of quantitative A mode and gray scale B mode presentations. An independent calibrator and preset amplification levels allow the apparatus to be calibrated for precise, repeatable examinations. A wide range of echo amplitude information is available to the clinician by the use of selective logarithmic signal compression. Distance measurements in the eye and the orbit are made to 0.1 mm precision and are displayed numerically on the control panel. The newer signal processing techniques provide high-resolution imaging of ophthalmic structures over a wide system bandwidth. Sensitivity has been improved to image structures heretofore not observable with ultrasonic instruments. This technique is the basis for recently initiated clinical studies.
Humans↗
A new photostimulator for continuous recording of the visual evoked potential.
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Contact Lenses↗
An ophthalmic ultrasound scanning system.
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Eye Diseases↗
Electronically-scanned ophthalmic ultrasound.
A linear-array ultrasonic system has been developed for ophthalmic application. The clinical apparatus gives real-time digital imaging at higher speeds and sensitivity compared to contemporary mechanically-scanned single transducer equipment. The linear-array system is electronically scanned to produce 60 images s-1 with 64 gray-tone levels. The 256 X 580 pixel B-mode image is presented simultaneously with an A-mode display on a television monitor. Fast-frame imaging at high sensitivity has special advantages in ophthalmic differential diagnosis enabling a more comprehensive evaluation of retinal, vitreous and orbital pathology. Imaging of fine blood vessels has improved ultrasonic diagnosis of ocular neoplasms and inflammatory conditions. Clinical advantages of this apparatus and special technical specifications are discussed in this report.
Eye Diseases↗