Doppler Sonography in Infancy and Childhood by Michael Hofbeck, Karl-Heinz Deeg, Thomas Rupprecht

By Michael Hofbeck, Karl-Heinz Deeg, Thomas Rupprecht

This publication covers the entire diversity of present purposes of Doppler sonography in infancy and early life, describing the range of power findings through a wealth of pictures. After an introductory bankruptcy at the actual and technical foundation of Doppler sonography, purposes of cerebral Doppler sonography in infancy and of transcranial Doppler sonography in early life are addressed, with a number of examples of imaging appearances. the foremost a part of the booklet is dedicated to Doppler sonography of the mind, face and neck and of the stomach, masking common belly vessels, liver, spleen, pancreas, and mesenteric and renal flow. Imaging of the ovaries and testes can also be provided, encompassing the differential analysis of acute scrotum and different space-occupying lesions of the testis. The publication closes by means of contemplating Doppler sonography of soppy tissue and vascular malformations, and the impression of congenital center malformations on circulate parameters in peripheral arteries. Doppler Sonography in Infancy and formative years can be a useful reference for pediatricians, neonatologists, pediatric sonographers, and pediatric and common radiologists.

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Extra resources for Doppler Sonography in Infancy and Childhood

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Springer, Berlin/Heidelberg/New York, pp 11–18 Maulik D (2005) Spectral Doppler: basic principles and instrumentation. In: Doppler ultrasound in obstetrics and gynecology. Springer, Berlin/Heidelberg/NewYork, pp 20–24 McLeod FD (1974) Multichannel pulse Doppler techniques. In: Renemann RS (ed) Cardiovascular application of ultrasound. American Elsevier Publishing Co, New York, pp 85–107 Mühlen zur J (1989) Dopplersonographie der peripheren Arterien und Venen. Promonta, Hamburg Namekawa K, Kasai C, Tsukamoto M, Koyano A (1982) Real-time bloodflow imaging system utilizing autocorrelation techniques.

However, since all the flow information would be present in isolated form, many hundred display or registration channels would be needed. On the one hand, such huge technical elaboration is out of question, but on the other hand, two-dimensional Doppler would expand diagnostic possibilities. American and Japanese developers have independently found a completely new and less complex way to display 2D flow data: the colour-coded Doppler method (Bommer and Miller 1982; Namekawa et al. 1982; Omoto 1984).

Even if the flow velocity is invariable throughout the entire length of the vessel under examination, the corresponding colour display varies greatly. 22 example, the flow through the sample volumes on the outside right is at a very sharp angle (high ­ approach speed) and the resulting pixels appear light red. Further to the centre, the angle between the scanning beam and the flow gets wider, which corresponds to a lower approach speed. The colour pixels therefore appear dark red. Directly beneath the ultrasonic probe, the angle of flow through some sample volumes is at an angle of 90°.

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