Figure 2From: Validation of an arterial tortuosity measure with application to hypertension collection of clinical hypertensive patientsPhantom helices . 3-D helix phantoms were display with shaded surfaces. (top left) Pitch 5(2Ï€). (top right) Pitch 10(2Ï€). (bottom left) Pitch 20(2Ï€). (bottom right) Pitch 40(2Ï€).Back to article page