Three　dimensional　Born　and　Kirchhoff　inverse　scattering　methods　are　modified　to　convenient　forms　for　a　cylindrical　specimen　that　includes　three　dimensional　defect.　One　aluminum　cylinder　with　flaw　model　is　prepared　and　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　is　to　say　that　the　methods　are　modified　to　convenient　form　to　use　measured　waveforms　in　the　x(1)-x(2)　plane.　The　measured　wave　data　are　fed　into　the　inversion　method　and　cross-sectional　images　are　obtained.　Then,　three　dimensional　shape　reconstruction　of　flaw　model　in　aluminum　specimen　is　performed　by　piling　up　the　cross-sectional　images.　(C)　2007　Elsevier　Ltd.　All　rights　reserved.