接触式DCT实验装置与仿体实验设计OA

Objective To solve the problem of increased equipment cost caused by the need for large-scale source-detector(S-D)arrays to complete data acquisition in large-area contact diffuse correlation tomography(DCT)equipment.Methods An optical switch array was used to time-division multiplexing one group of S-D into eight groups,covering a total of 8 cm×8 cm target tissue.Each long and short distance S-D cross distribution formed a concentric circle structure.By taking advantage of its symmetry and equivalence,the balance of photons obtained by voxel was guaranteed,while the detection area and depth were expanded.Results By using this low-cost DCT equipment,the reconstructed position of the Phantom"cross-shaped"heterogeneous object was accurate,the shape was basically complete,and the contrast of the second layer(depth 0.5-1.0 cm)of the reconstructed image was 0.75.The contrast of the"tubular"heterogeneous substances showed a good linear relationship with the flow velocity,with precise reconstruction positions and complete morphology.The blood flow index in the natural state of the clinical cuffcompression test experiment was approximately 10 times that in the pressurized state,and the 3D images and image standard deviations also showed that the blood supply in the natural state was more abundant.Conclusion This contact-type DCT equipment has a strong detection ability for heterogeneous substances of various shapes and can be used as a new detection method to detect diseases related to abnormal blood perfusion.