The　body-cover　concept　suggests　that　the　vibration　of　body　layer　is　an　indispensable　component　of　vocal　fold　vibration.　To　quantify　this　vibration,　a　synchronized　system　composed　of　a　high-frame-rate　ultrasound　and　a　modified　electroglottograph　(EGG)　was　employed　in　this　paper　to　simultaneously　image　the　body　layer　vibration　and　record　the　vocal　fold　vibration　phase　information　during　natural　phonations.　After　data　acquisition,　the　displacements　of　in　vivo　body　layer　vibrations　were　measured　from　the　ultrasonic　radio　frequency　data,　and　the　temporal　reconstruction　method　was　used　to　enhance　the　measurement　accuracy.　Results　showed　that　the　modified　EGG,　the　waveform　and　characteristic　points　of　which　were　identical　to　the　conventional　EGG,　resolved　the　position　conflict　between　the　ultrasound　transducer　and　EGG　electrodes.　The　location　and　range　of　the　vibrating　body　layer　in　the　estimated　displacement　image　were　more　clear　and　discernible　than　in　the　ultrasonic　B-mode　image.　Quantitative　analysis　for　vibration　features　of　the　body　layer　demonstrated　that　the　body　layer　moved　as　a　unit　in　the　superior-inferior　direction　during　the　phonation　of　normal　chest　registers.　(C)　2013　Acoustical　Society　of　America.