Chapter 8: References 201
References
HC/AC Ratio
Campbell S., Thoms Alison. “Ultrasound Measurements of the Fetal Head to Abdomen
Circumference Ratio in the Assessment of Growth Retardation,” British Journal of Obstetrics and
Gynaecology, 84: (March 1977), 165-174.
General References
+/x or S/D Ratio
+/x = abs (Velocity A/Velocity B)
where A = velocity cursor +
B = velocity cursor x
Acceleration Index (ACC)
Zwiebel, W.J. Introduction to Vascular Ultrasonography, 4th ed., W.B. Saunders Company, (2000),
52.
ACC = abs (delta velocity/delta time)
Elapsed Time (ET)
ET = time between velocity cursors in milliseconds
Percent Area Reduction
Taylor K.J.W., P.N. Burns, P. Breslau. Clinical Applications of Doppler Ultrasound, Raven Press,
N.Y., (1988), 130-136.
Zwiebel W.J., J.A. Zagzebski, A.B. Crummy, et al. “Correlation of peak Doppler frequency with
lumen narrowing in carotid stenosis.” Stroke
, 3: (1982), 386-391.
% Area Reduction = (1 - A2(cm
2
)/A1(cm
2
)) * 100
where: A1 = original area of the vessel in square cm
A2 = reduced area of the vessel in square cm
Percent Diameter Reduction
Handa, Nobuo et al., “Echo-Doppler Velocimeter in the Diagnosis of Hypertensive Patients: The
Renal Artery Doppler Technique,” Ultrasound in Medicine and Biology
, 12:12 (1986), 945-952.
% Diameter Reduction = (1 - D2(cm)/D1(cm)) * 100
where: D1 = original diameter of the vessel in cm
D2 = reduced diameter of the vessel in cm
To Next Page
Loading...
