Download Doppler Ultrasound in Obstetrics and Gynecology by Dev Maulik PDF

By Dev Maulik

Show description

Read Online or Download Doppler Ultrasound in Obstetrics and Gynecology PDF

Similar obstetrics & gynecology books

Evidence-Based Care for Normal Labour and Birth: A Guide for Midwives

Evidence-based care is a good verified precept in modern healthcare and an international large health and wellbeing care circulate. besides the fact that, regardless of the emphasis on selling evidence-based or powerful care with out the pointless use of applied sciences and medication, intervention charges in childbirth are emerging quickly.

Prevention and Management of Complications from Gynecologic Surgery, An Issue of Obstetrics and Gynecology Clinics (The Clinics: Internal Medicine)

Prevention and administration of issues from Gynecologic surgical procedure is reviewed during this factor of Obstetrics and Gynecology Clinics. visitor Editor Dr. Howard Sharp has assembled a panel of specialists to pen articles on themes together with fighting energy-related accidents; Prevention, prognosis, and remedy of surgical website infections; significant vessel harm; Hysteroscopic problems; Surgical hemostasis; knowing cognitive error in laparoscopic surgical procedure; fighting neurologic harm in the course of surgical procedure; and Gastrointestinal and genitourinary tract accidents.

Die Weiblichen Sexualhormone: In Ihren Beƶiehungen ƶum Genitalƶyklus und ƶum Hypophysenvorderlappen

Dieser Buchtitel ist Teil des Digitalisierungsprojekts Springer ebook information mit Publikationen, die seit den Anfängen des Verlags von 1842 erschienen sind. Der Verlag stellt mit diesem Archiv Quellen für die historische wie auch die disziplingeschichtliche Forschung zur Verfügung, die jeweils im historischen Kontext betrachtet werden müssen.

Self Assessment and Review of Plastic Surgery

Fresh publication in ideal situation. speedy transport with monitoring quantity.

Additional info for Doppler Ultrasound in Obstetrics and Gynecology

Sample text

The relation is expressed in the following equation: fmax ˆ fpr =2 where fmax is the maximum frequency measurable without ambiguity (Nyquist limit), and fpr is the sampling rate or the pulse repetition frequency. Ambiguity in frequency resolution occurs when the PW Doppler beam interrogates a vessel with such a high blood flow velocity that the maximum frequency content of the Doppler signal exceeds the Nyquist limit. In this circumstance, the frequency cannot be estimated precisely. The frequency component in excess of the limit is subtracted from the Nyquist frequency and is negatively expressed (Fig.

Pulsed-wave Doppler transducer 25 Doppler Sample Volume The three-dimensional region in the path of the transmitted ultrasound beam from which the frequency shift signals are obtained is called the Doppler sample volume (DSV). For the CW Doppler system, the totality of the superimposed region represents the DSV and is therefore of no relevance. For the PW Doppler system, the range-gated zone from which the backscattered echoes are received constitutes the sample volume. The DSV is an important consideration for PW Doppler applications because its location and axial dimension can be controlled by the examiner.

It limits the use of high-frequency transducers for Doppler interrogation of deep vascu- 13 lar structures. These considerations influence the choice of a transducer for a specific use. Thus for Doppler examinations of fetal circulation, a 5-MHz transducer may by less efficient for obtaining adequate signals than a 2-MHz transducer. Doppler Effect The Doppler effect is the phenomenon of observed changes in the frequency of energy wave transmission when relative motion occurs between the source of wave transmission and the observer.

Download PDF sample

Rated 4.51 of 5 – based on 19 votes