By Frederick W. Kremkau (auth.), Edward G. Grant M.D., E. Maureen White M.D. (eds.)
Duplex Sonography is the 1st accomplished textual content written approximately this modality. The ebook deals the reader special information regarding all significant makes use of of duplex and is brought by way of a short bankruptcy at the actual rules of doppler ultrasound because it pertains to duplex scanning. Duplex Sonography is meant to supply suitable info on all facets of the approach, starting from the fundamentals of appearing the exam to the good points of occasionally advanced pathological states. The publication is meant for someone drawn to non-invasive vascular analysis together with radiologists, vascular surgeons and ultrasound/peripheral vascular technologists. different teams may possibly locate person chapters beautiful: carotid/cardiac sonography for cardiologists, fetal sonography for obstetricians or carotid sonography for neurologists. every one bankruptcy isn't just a advisor to duplex review, but additionally presents important information regarding vascular dynamics of the organ process below dialogue. Physicians or technologists examining this ebook may still come away with a well-rounded history in cutting-edge duplex sonography and should absolutely observe new probabilities for utilizing this non-invasive vascular technique.
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Additional info for Duplex Sonography
The problem of quantification of the signal was finally overcome by various computer manipulations resulting in spectral analysis. These manipulations transform auditory information into a quantifiable, graphic image. Nonquantitative Doppler presently seems to suffice in many areas of the body. Exact quantification of blood flow and, therefore, stenosis, may be less important, for example, than flow direction or identification of inappropriate vascular resistance. In many areas this may change with increasing research, but at the outset, pre- 2.
Angling the Doppler cursor steeply up or down into the real·time shadow may yield information about flow dynamics. Approaching the lesion from the opposite side of the neck may also help overcome this problem. Plaque ulceration also has been scrutinized with real;time sonography. Ulcerated plaque has long been the arteriographic hallmark of operable nonrate-limiting carotid disease. The actual significance of many carotid "ulcera· tions;' however, remains unclear. When seen by real-time examination, ulcerations demonstrate the expected excavation or niche within a plaque (Fig.
10 A, B). This vessel is the first branch of the ECA; the ICA has no branches at all in the neck. One must be certain the supposed superficial thyroid artery is actually a vascular structure and not a thin muscle bun- 21 die. If any question exists, Doppler should demonstrate relatively low-resistance flow in the opposite direction from the ECA. In practice, on the basis of the "unreliable" anatomic information just discussed, the sonographer rapidly decides which vessel is being insonated. By visual inspection alone one can usually get a correct impression.