1. Omoto R, Kasai C. Physics and instrumentation of Doppler color flow mapping. Echocardiography. 1987;4:467–83.
2. Lee R. Physical principles of flow mapping in cardiology. In: Nanda NC, editor. Textbook of color Doppler echocardiography. Philadelphia: Lea & Febiger; 1989. p. 18.
3. Kremkau FK. Principles of color flow imaging. J Vasc Tech. 1991;15:104–9.
4. Namekawa K, Kasai C, Tsukamoto M, Koyano A. Real time bloodflow imaging system utilizing autocorrelation techniques. In: Lerski R, Morley P, editors. Ultrasound “82”. London: Pergamon; 1983. p. 203–8.
5. Angelsen BAJ, Kristoffersen K. On ultrasonic MTI measurement of velocity profiles in blood flow. IEEE Trans Biomed Eng. 1979;26:665–71.