Welcome to Classifications and Online Calculators in Radiology
to support your knowledge in radiology.
You will find here:
- 115 pages and counting
- Classifications
- Online calculators
- Tables
Moreover:
- Some pages are accompanied by illustrations
- All pages contain tags for easy navigation
The concept
The concept of this website is based on a previous site that was founded in 2008 and is still up and running. The website is composed as a book, where all sources are properly referenced, according to a good practice in scientific publications.Didn't find a classification?
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Estimate of stenosis of artery by flow velocity in peripheral arterial occlusive disease
Severity of a stenosis can be estimated by measuring of peak systolic velocity (PSV) in the stenosis and proximal to it and by the appearance of the waveform.
| Luminal narrowing | PSV stenosis / PSV proximal | Description |
|---|---|---|
| 0 - 49% | <2 | triphasic waveform, spectral broadening, increased enddiastolic flow velocity in stenosis close to 49% |
| 50 - 74% | ≥2 | biphasic or monophasic waveform, increased enddiastolice flow velocity, spectral broadening, disturbed or diminished flow distal to the stenosis |
| 75 - 99% | ≥4 | monophasic waveform with marked increase of enddiastolic flow velocity; markedly disturbed flow (turbulent flow), spectral broadening and diminished flow distal to the stenosis |
| occlusion | no flow | high-resistance flow proximal to the stenosis |
References:
1. Weitz JI, Byrne J, Clagett GP, Farkouh ME, Porter JM, Sackett DL, et al. Diagnosis and Treatment of Chronic Arterial Insufficiency of the Lower Extremities: A Critical Review. Circulation. 1996 Dec 1;94(11):3026–49
2. De Vries SO, Hunink MG, Polak JF. Summary receiver operating characteristic curves as a technique for meta-analysis of the diagnostic performance of duplex ultrasonography in peripheral arterial disease. Acad Radiol. 1996 Apr;3(4):361–9.
3. Kasapis C, Gurm HS. Current Approach to the Diagnosis and Treatment of Femoral-Popliteal Arterial Disease. A Systematic Review. Curr Cardiol Rev. 2009 Nov;5(4):296–311
4. Abela GS. Peripheral Vascular Disease: Basic Diagnostic and Therapeutic Approaches. Lippincott Williams & Wilkins; 2004:316
5. Polak JF. Peripheral Vascular Sonography. Lippincott Williams & Wilkins; 2004.
