By Wilhelm Schäberle
ISBN-10: 3642025080
ISBN-13: 9783642025082
ISBN-10: 3642025099
ISBN-13: 9783642025099
This is the second one version of a well-received ebook that has been steered for inclusion in any vascular library or vascular radiology suite. the 1st variation has been absolutely revised which will supply a accomplished, up to date account of vascular ultrasound that displays fresh interesting advances during this diagnostic modality.
The emphasis is still at the scientific facets such a lot appropriate to angiologists and vascular surgeons. the most chapters are subdivided right into a textual content part and an atlas part. The textual content a part of every one bankruptcy files the ultrasound anatomy of the vascular territory in query, explains the exam approach, describes general and pathological findings, specifies the symptoms for diagnostic ultrasound, and assesses the scientific effect of the ultrasound findings. The atlas a part of every one bankruptcy provides a compilation of pertinent case fabric to demonstrate the common ultrasound findings for either the extra universal vascular ailments and rarer stipulations which are however major for the vascular health practitioner and angiologist. all through, the ultrasound fabric is in comparison with the angiographic and intraoperative findings.
Beginners will locate this an invaluable textbook that courses them from a wise and effective exam process to trustworthy interpretation of ultrasound findings at the foundation of a radical dialogue of all proper vascular illnesses. skilled sonographers will enjoy the entire presentation of infrequent vascular ailments, the designated assessment of the function of ultrasound in comparison with different modalities, and the dialogue of the ultrasound findings of their medical context.
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Additional info for Ultrasonography in Vascular Diagnosis: A Therapy-Oriented Textbook and Atlas
Example text
The amount of Doppler information collected from the large number of sample volumes along the scan line (in contrast to a single, circumscribed gate in conventional duplex scanning) is too large to be processed by spectral analysis using the FFT with decomposition of the spectrum into its component parts and display of the proportions of different flow velocities at a given location. Instead, the faster autocorrelation technique is used to calculate the mean frequency shift and the corresponding mean velocity.
For angles of about 90°, the cosine function yields values around 0, at which there is no Doppler frequency shift, and 1 Fundamental Principles 12 the Doppler shift increases as the angle decreases (with a maximum cosa of 1 at a = 0°). The blood flow velocity is calculated by solving the Doppler shift equation for V: V = ( Fr − F0 ) · c cos α ·2 F0 This formula allows one to calculate the blood flow velocity from the measured Doppler frequency shift at a given transmit frequency and angle of incidence.
Nondirectional systems cannot discriminate between positive and negative flow directions. In a directional system, information on the flow direction is extracted from the phase shift. 1 Technical Principles of Diagnostic Ultrasound CW Doppler R T f′ f V Fig. 19 Diagram of continuous wave (CW) Doppler ultrasound. Ultrasound pulses are continuously emitted by the transmitter (T) and the frequency-shifted signals reflected by red blood cells moving at different velocities return to the receiver (R) received, CW Doppler cannot assign the returning Doppler signal to a specific depth.
Ultrasonography in Vascular Diagnosis: A Therapy-Oriented Textbook and Atlas by Wilhelm Schäberle
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