Based　on　the　basic　principle　of　the　interaction　between　Lamb　waves　of　different　modes　and　cracks　originating　from　a　through-hole,　the　current　work　focused　on　the　precise　detection　of　time-of-flight　(ToF)　for　Lamb　wave　packets　of　different　modes,　and　implements　the　Lamb　wave　localization　and　imaging　of　cracks　originating　from　a　through-hole　by　fusing　Radon　transform　with　taking　the　crack　originating　from　the　hole　in　an　isotropic　plate　as　the　research　object.　Firstly,　a　broadband　chirp　signal　was　used　to　excite　the　sparse　sensor　array　for　the　generation　of　Lamb　waves,　and　the　scattering　signals　of　through-hole　were　obtained　as　the　baseline　signals,　where　the　scattering　ones　of　the　crack　originating　from　the　hole　were　collected　as　monitoring　signals.　Secondly,　the　chirp　response　signals　were　filtered　and　the　center　frequency　and　modulation　cycle　number　of　the　corresponding　narrowband　responses　of　tone　burst　were　optimized.　Then,　the　Radon　transform　was　performed　on　the　baseline　singles　of　tone　burst　response　to　obtain　the　optimized　group　velocity　and　offset　time,　and　the　ToF　of　Lamb　wave　packet　was　calculated.　Finally,　the　elliptical　imaging　algorithm　was　used　to　locate　and　image　the　crack　originating　from　the　hole,　and　the　imaging　results　were　compared　with　those　by　the　nominal　group　velocity　method.　The　results　showed　that　the　ToF　of　Lamb　wave　packet　can　be　accurately　calculated　with　the　fusion　of　Radon　transform,　which　improved　the　detection　capability　of　different　modal　Lamb　waves　for　the　defects　of　crack　originating　from　the　hole.　©　2024　Shanghai　Institute　of　Mechanical　Engineering.　All　rights　reserved.