ERRORS RESULTING FROM FINITE BEAMWIDTH AND SAMPLE DIMENSIONS IN THE DETERMINATION OF THE ULTRASONIC-ABSORPTION COEFFICIENT

被引:8
作者
DREWNIAK, JL
FRIZZELL, LA
DUNN, F
机构
[1] Bioacoustics Research Laboratory, University of Illinois, Urbana, Illinois, 61801
关键词
D O I
10.1121/1.399747
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
The error resulting from heat conduction in the measurement of the ultrasonic absorption coefficient using the transient thermoelectric method is studied analytically. An expression for the temperature increase in a tissue specimen of finite dimensions, irradiated by a focused ultrasonic transducer, is given as a function of spatial coordinates, time, radial and axial beam dimensions, and absorption. An error is defined, and results are presented for various values of beamwidth, tissue dimensions, absorption, and time for the purpose of quantifying the experimental error due to heat conduction, and to provide guidance for minimizing this error in experimental procedures. For example, it is shown that the effect of heat conduction on the measured rate of temperature increase is less than 7% when using a transducer with a 5-mm half-power beamwidth at depths greater than 1.5 mm in the tissue. PACS numbers: 43.35.Yb, 43.80.Ev. © 1990, Acoustical Society of America. All rights reserved.
引用
收藏
页码:967 / 977
页数:11
相关论文
共 24 条
[1]   ABSORPTION OF ULTRASOUND BY MAMMALIAN OVARIES [J].
CARNES, KI ;
DUNN, F .
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, 1988, 84 (01) :434-437
[2]  
CARSTENSEN EL, 1982, ACUSTICA, V51, P116
[3]  
DUNN F, 1969, BIOL ENG, P205
[4]   THRESHOLD DOSAGES FOR DAMAGE TO MAMMALIAN LIVER BY HIGH-INTENSITY FOCUSED ULTRASOUND [J].
FRIZZELL, LA .
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL, 1988, 35 (05) :578-581
[5]   THRESHOLDS FOR FOCAL ULTRASONIC LESIONS IN RABBIT KIDNEY, LIVER AND TESTICLE [J].
FRIZZELL, LA ;
LINKE, CA ;
CARSTENSEN, EL ;
FRIDD, CW .
IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING, 1977, 24 (04) :393-396
[6]  
FRY F J, 1970, Journal of the Acoustical Society of America, V48, P1413, DOI 10.1121/1.1912301
[7]   DETERMINATION OF ABSOLUTE SOUND LEVELS AND ACOUSTIC ABSORPTION COEFFICIENTS BY THERMOCOUPLE PROBES - EXPERIMENT [J].
FRY, WJ ;
FRY, RB .
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, 1954, 26 (03) :311-317
[8]   DETERMINATION OF ABSOLUTE SOUND LEVELS AND ACOUSTIC ABSORPTION COEFFICIENTS BY THERMOCOUPLE PROBES - THEORY [J].
FRY, WJ ;
FRY, RB .
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, 1954, 26 (03) :294-310
[9]  
FRY WJ, 1962, PHYS TECHNOL BIOL RE, V4, P261
[10]  
GOSS S A, 1979, Ultrasound in Medicine and Biology, V5, P181, DOI 10.1016/0301-5629(79)90086-3