Title :
Shock wave pulse pressure after penetration of kidney tissue
Author :
Filipczynski, L. ; Etienne, Jerzy ; Kujawska, T.
Author_Institution :
Inst. of Fundamental Technol. Res., Polish Acad. of Sci., Warsaw, Poland
Abstract :
Lithotripter generated compressional peak pressure (p/sup +/) was measured after penetrating tissue samples 0.5, 1, 2.5, and 4 cm thick. The samples were taken from fresh pig kidneys and insonated by shock wave pulses with positive peak pressures varying from 14 to 72 MPa. The measurement results allow one to draw some qualitative conclusions concerning the attenuation process in the lithotripter beam and show that in practice the compressional peak pressure values generated in the lithotripter may decrease almost by a factor of two before reaching the kidney stone. On the contrary, theoretical estimates indicate that negative pressures are practically not influenced by attenuation due to their different spectral composition.<>
Keywords :
biomedical ultrasonics; kidney; radiation therapy; shock wave effects; 0.5 to 4 cm; 14 to 72 MPa; attenuation process; fresh pig kidneys; kidney stone destruction; kidney tissue penetration; lithotripsy treatment; lithotripter generated compressional peak pressure; negative pressures; shock wave pulse insonation; shock wave pulse pressure; spectral composition; therapeutic ultrasound; Attenuation; Frequency; Image reconstruction; Lithotripsy; Performance evaluation; Pressure measurement; Pulse measurements; Pulse shaping methods; Shape measurement; Shock waves;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
