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Doppler arteriography with chromatic frequency analysis is a new and very sound diagnostic method in cases of vascular disease. It can be carried out with apparatus such as the Echoflow (reg'd), a natural development of the Doppler technique ultrasonography. Vessels are shown in red, yellow, or blue, depending on the rate of their intraluminal flow. Surface arteries lying 5-6 cm below the skin and not hidden by bone can be studied. Preliminary results on 23 supra-aortic trunks, 21 lower extremity arterial systems, and 5 upper limb systems are described. The use of the instrument in other situations in also recommended.

Systematic examination of the upper aortic arch vessels by direct Doppler ultrasonography of the common and internal arteries is proposed, together with calculation of the flow rate, pressure-perfusion index, carotid ratio, and carotid distensibility index on a systematic basis. Obligatory compression movements to evaluate the several supplementary pathways in the case of disease are also recommended to complete the examination.