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Biomedical subjects

F Tessler

Publications and source records attributed to F Tessler.

9 recordsLinked to original sources
PubMed1990

Assurance of consistent peak-velocity measurements with a variety of duplex Doppler instruments.

To assess the need for quality control when measuring peak velocities with Doppler ultrasonography, 17 duplex Doppler instruments from six manufacturers were compared by using a flow phantom that had been calibrated for peak velocities ranging from 23 to 75 cm/sec. Variations in peak-velocity measurements among machines averaged 23% when tested at the same flow rate with a Doppler flow phantom, indicating that scientific articles that document peak velocities for various disease processes should be accompanied by equipment calibration data. Doppler string and flow phantoms were compared, and each was found to have deficiencies. Techniques for quality assurance procedures for Doppler measurements are given that should achieve consistent peak-velocity measurements on serial scans of patients undergoing treatment for vascular conditions.

Blood Flow Velocity↗
PubMed1988

Second-trimester sonographic diagnosis of Down syndrome: role of femur-length shortening and nuchal-fold thickening.

Relative shortening of femur length and nuchal-fold thickening were evaluated as sonographic signs for the prenatal detection of Down syndrome. The sonograms of 28 fetuses identified by amniocentesis as having trisomy 21 were reviewed. The sonograms of 128 fetuses with a normal karyotype were evaluated as a control group. The finding of either an actual-to-expected femur-length ratio of 0.91 or less or a nuchal-fold measurement of 6 mm or more detected Down syndrome with a sensitivity of 42% and a specificity of 88%. The positive predictive value for Down syndrome detection when using femur-length shortening alone was greater than that when using the combination of femur-length shortening and nuchal-fold thickness. We conclude that femur-length shortening may be potentially useful for the detection of Down syndrome, whereas nuchal-fold thickening has a limited role.

Down Syndrome↗
PubMed1988

Infant cranial sonography.

Sonography is well recognized as an excellent method of imaging the infant brain. A detailed discussion of the sonography of the preterm patient forms the first portion of this article. The numerous other clinical situations in which sonography can be used either alone or in conjunction with CT follow.

Brain↗
PubMed1988

Cerebrovascular ultrasound imaging.

Advancements in technology have brought noninvasive diagnosis of cerebrovascular disease to a high level of accuracy in a relatively short period of time. Conventional duplex sonography allows precise vessel localization and Doppler quantification. The further refinement of color flow imaging promises to simplify the examination and add considerable confidence to the diagnosis. Regardless of the technology used, ultrasound evaluation of the carotid arteries remains a difficult examination to perform, and excellent results are only possible with meticulous technique. The astute sonographer or sonologist will use all aspects of available ultrasound technology to the fullest. Careful evaluation of a seemingly overwhelming array of parameters will result in an impressive degree of diagnostic accuracy.

Carotid Artery, Internal↗