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The application discloses a kind of based on two-dimensional weighted back projection and linear base function interpolation trunk three-dimensional imaging method, comprising: selecting several different measurement heights of to-be-imaged trees, using stress wave measuring equipment respectively at different heights to carry out stress wave data acquisition;Using two-dimensional weighted back projection algorithm reconstructs the stress wave velocity field of each layer, obtains the control point set needed for linear base function interpolation;All known control point set is mapped to three-dimensional coordinate system, and with the wave speed v corresponding to each point constitutes three-dimensional feature point cloud;Linear base function interpolation of using linear kernel is used to carry out interpolation reconstruction, and function F ( x , y , z ) are fitted;According to fitting function F ( x , y , z ) all point sets located in three-dimensional fault imaging region are calculated;Using the display method of point cloud, the points inside imaging region are visualized and displayed.The application significantly improves three-dimensional imaging speed and defect recognition accuracy in actual scene, and is suitable for nondestructive testing and evaluation of three-dimensional defects inside trunk.

A polypeptide targeting integrin α6 and the use thereof. The polypeptide has a sequence motif of RWYD, and is stronger in affinity, wherein the equilibrium dissociation constant KD reaches the level of nM, and the affinity is greatly improved. The polypeptide has a strong affinity to integrin α6, a strong specificity and no biological toxicity, is relatively stable in vivo and reasonable in distribution, and can be used as a targeting carrier. In addition, the polypeptide targeting integrin α6 can be used as a molecular probe in the molecular imaging of various tumors with highly-expressed integrin α6. Further provided is a dimer of the polypeptide, which has a more significant targeting effect and no biological toxicity. The polypeptide targeting integrin α6 can be used in the molecular imaging of various tumors with highly-expressed integrin α6, and has an important application value in the molecular imaging of tumors.