Ai. Elfallah et al., ULTRASONIC MEASUREMENT OF BREAST-TISSUE MOTION AND THE IMPLICATIONS FOR VELOCITY ESTIMATION, Ultrasound in medicine & biology, 23(7), 1997, pp. 1047-1057
Citations number
7
Categorie Soggetti
Radiology,Nuclear Medicine & Medical Imaging",Acoustics
A high-resolution study of breast tissue motion during cardiac systole
and respiration is presented, An experimental system was designed to
achieve a velocity resolution on the order of 1 mm/s with high spatial
resolution. The peak velocity of tissue motion estimated during cardi
ac systole ranged from 0.2 mm/s to 5.6 mm/s among the subjects studied
, It is shown that motion due to the cardiac cycle is less significant
when the subject is positioned on the side rather than supine, The me
an tissue velocity among subjects in the supine position is 2.88 mm/s
and drops to 0.81 mm/s for the side position, with a corresponding spa
tial displacement of 0.095 mm, dropping to 0.027 mm, The velocity prof
iles indicate that 100 ms is required for the entire ribcage contracti
on-relaxation process to occur, Experiments using a prone biopsy table
show the almost complete elimination of tissue motion due to cardiac
systole, suggesting that the use of the table eliminates this motion,
thus allowing for high-resolution blood velocity estimates, Features r
esulting from respiratory motion are also presented, We found this mot
ion to be of a much longer time duration, and of a much higher magnitu
de, with velocities and high as 29 mm/s, The implications of the study
on the high-resolution estimation of blood velocity and high-resoluti
on breast imaging are discussed, (C) 1997 World Federation for Ultraso
und in Medicine & Biology.