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. Author manuscript; available in PMC: 2014 Apr 21.
Published in final edited form as: Phys Med Biol. 2013 Mar 26;58(8):2537–2559. doi: 10.1088/0031-9155/58/8/2537

Table 1.

HIFU field parameters in a soft layer placed in the focal region behind the ribs. The array elements located in the shadow of ribs were switched off.

Initial intensity I0, W·cm−2 2.5* 2.5 5 10 20 30 40
Initial pressure p0, MPa 0.27 0.27 0.39 0.55 0.77 0.95 1.1
Focusing gain, GI = IF/I0 367 377 387 410 476 552 580
Ratio of intensities in the main and side foci Imain/Iside 1.90 1.94 1.99 2.09 2.39 2.75 2.86
Focusing gain, Gp = pF/p0 19.2 23.5 26.2 31.8 50.9 77.1 80.8
Ratio of pressures in the main and side foci pmain/pside 1.4 1.5 1.6 1.8 2.5 3.5 3.3
Ratio of linear and nonlinear heating rates in the main focus QN/QL 1.00 1.07 1.15 1.37 2.39 34.8 66.2
Ratio of heating rates in the main and side foci Qmain/Qside 1.90 2.00 2.12 2.42 3.92 45.4 71.3
Time of achieving 100°C in the main focus, ms 19100 19000 3200 740 190 9.5 2.5
Ratio of temperature rise in the main and side foci when temperature in the main focus reaches 100 °C, ΔTmain/ΔTside 1.79 1.82 2.00 2.20 3.00 26.0 65.0

The second column, marked as 2.5*W/cm2 for the initial intensity, corresponds to linear acoustic modelling, other initial values correspond to nonlinear modelling.