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第 38 卷 第 3 期       张艳秋等: 剪切波对 HIFU 经颅聚焦形成温度场影响的数值仿真研究                                       417


                      x                                         y
                                                               300
                     300

                                                               250
                     250

                                                               200
                     200
                                                                                       λ max
                                             λ max
                                                                                   θ
                                         θ
                     150                                       150
                                                      15 mm            98 mm     45 mm
                                                                                      28 mm
                            98 mm       45 mm
                                            28 mm                         7 mm
                     100                                       100
                                7 mm
                      50                                        50


                       0      50    100    150   200      z      0      50    100    150   200     z
                                   (a) x-z䶒                                    (b) y-z䶒

                                               图 7  超声最大入射角度计算示意图
                                Fig. 7 Schematic diagram of the maximum incident angle of ultrasound

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