Title :
Wavefront amplitude distortion and image sidelobe levels. II. In vivo experiments
Author :
Zhu, Qing ; Steinberg, Bernard D. ; Arenson, Ronald L.
Author_Institution :
Moore School of Electr. Eng., Pennsylvania Univ., Philadelphia, PA, USA
Abstract :
For part I, see ibid., vol.40, no.6, p.747-753 (1993). In vivo measurements of the rise of the sidelobe level in a single-source image obtained through the female breast as a function of the distortion of the wavefront amplitude are described. The measured sidelobe levels are the average sidelobe floor (ASF) and the peak sidelobe level (PSL). The ASF is shown to be proportional to the variance of the modulus of the wavefront normalized to the square of its mean value, with a proportionality constant close to the value predicted by theory. The PSL similarly increases linearly. The average ratio of PSL to ASF is 5 (7 dB).<>
Keywords :
acoustic imaging; biomedical ultrasonics; medical image processing; ASF; PSL; average sidelobe floor; female breast; image sidelobe levels; in-vivo measurement; peak sidelobe level; single-source image; ultrasonic propagation; wavefront amplitude distortion; wavefront modulus variance; Breast; Distortion measurement; Focusing; In vivo; Phase distortion; Phase measurement; Pulse measurements; Radiology; Ultrasonic transducer arrays; Ultrasonic variables measurement;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
