In　this　article,　three-dimensional　Kirchhoff　inverse　scattering　method　is　modified　to　convenient　form　for　a　cylindrical　specimen　that　includes　three-dimensional　defects　including　two-circle　voids.　Ultrasonic　measurements　are　carried　out.　The　measurement　area　in　the　modified　methods　is　restricted　in　the　plane　perpendicular　to　the　axis　of　cylindrical　specimen.　That＇s　to　say　that　the　method　is　modified　to　convenient　form　to　use　measured　waveforms　in　the　x1-x2　plane.　The　measured　wave　data　are　fed　into　the　inversion　method　and　cross-sectional　images　are　obtained.　We　get　the　numerical　results　from　all　directions　by　finite　element　method.　It　is　verified　that　the　Kirchhoff　inversion　works　well　for　shape　reconstruction　of　defects.　©　2011　IEEE.