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您好，我想请问一下xwr1642_profile_VitalSigns_20fps_Back/Front的选择是与人是正对还是背对板子有关，还是板子是正对还是背对人的胸腔有关？我是否可以将板子放在人的背面和侧面测呼吸心率？
front是人正对着前面的板子。
back是人背对着后面的板子。
