'These two books address the current status of specialized clinical approaches and research echocardiography. Both volumes contain publications by clinicians as well as scientists and emphasize to the reader the importance of a stron clinician-scientist interaction in the performance of ultrasonic research. ... The publication of these books indicates the intensity of interest in expanding the horizons of echocardiography to provide quantitative data on cardiac function as well as structure.' The New England Journal of Medicine, 310:4 (1984)