New PDF release: Donald School Textbook of Ultrasound in Obstetrics &

By Prof and Chairman Asim Kurjak

ISBN-10: 0203640594

ISBN-13: 9780203640593

ISBN-10: 1842142577

ISBN-13: 9781842142578

That includes greater than 650 colour illustrations, this definitive quantity presents finished and specialist assurance at the useful purposes of ultrasound. The textual content is split into 3 components: common features, obstetrics, and gynecology. It contains contemporary technological breakthroughs in diagnostic ultrasound, together with the arrival of colour Doppler, energy Doppler, and 3-dimensional and 4-dimensional imaging. All participants are both current or former academics on the eight branches of the Ian Donald tuition. A finished textual content with cutting-edge pictures, the publication is of worth to obstetricians, gynecologist, and clinical ultrasonographers.

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Extra resources for Donald School Textbook of Ultrasound in Obstetrics & Gynecology

Example text

Therefore, the mode is suitable for research work of which exposure duration is hardly expected before the study. TI may also be lower than one in the screening for the fetal abnormality during pregnancy. e. the exposure time is preset before the study.

This causes difficulty with the ranging process. In effect, multiple gates or sample volumes are operating at different depths. Multiple sample gates are shown on the display to indicate this condition. Range ambiguity in color-flow Doppler, as in sonography, places echoes (color Doppler shifts in this case) that have come from deep locations after a subsequent pulse was emitted in shallow locations where they do not belong. As already said, the HPRF systems intentionally introduce this ambiguity for spectrometry, requiring sound judgment by the operator as to whether the results are correct or not.

If there are, they will get moved over to an inappropriate location along with the aliasing peaks. Other approaches to eliminating aliasing include changing to a lower frequency Doppler transducer or changing to a continuous-wave instrument, which is often built-in into specialized cardiologic units. Aliasing can occur in a pulse system since it is a sampling system, which can not yield a correct result unless it samples often enough, that is, twice the highest Doppler shift frequency. This is called the Nyquist limit (of the sampling theorem).

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Donald School Textbook of Ultrasound in Obstetrics & Gynecology by Prof and Chairman Asim Kurjak

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