The Study On The Control And Three-Dementional Image Reconstruction In A Color Wide Field Oct System

Optical coherence tomography (OCT) is a new optical imaging technology, which is non-intrusively, fast, with high sensitivity and high precision. By utilizing low coherent characteristic of broadband light source, OCT does the tomography with a high resolution to microstructure of samples within their organization through measuring interference signal of sample’s back-scattering light. It is a synthetical imaging technology combining a wide range of subjects including optics, physics, precise and automatic control, electronics and computer graphics and imaging. Wide Field Optical Coherence Tomography (WFOCT) technology, based on the traditional OCT, is expected to overcome the shortcomings of the traditional OCT, such as the slowly imaging speed, the high cost, low longitudinal resolution and so on. In the thesis the design of the mechanical and electrical control and three-dementional image reconstruction based on cross-sectional images in a color Wide-field OCT system are carried out. And performances of the color wide-field OCT system are studied experimentally.In the design of the mechanical and electrical control in a color wide-field OCT system, based on the basic principle of a wide-field OCT system and system hardware select, relevant control softwares in the color wide-field OCT system are designed. Firstly, a macro-move stage, a micro-move stage and a CCD camera are controlled independently on the VC6.0platform. Then, according to the principle of the four phase-shifting, interconnected controls among them are achieved. And longitudinal scans in the system are realized. The softwares designed are tested experimentally in the Color Wide-Field OCT system. The results show that the surface and subsurface information of samples which usually are homogeneous, transparent and with high albedo can be collected when the designed controller softwares are used in the Color Wide-Field OCT system.In the study on the three-dementinal image reconstruction in the color wide-field OCT system, in order to be able to observe more directly inrerest regions on surfaces of samples more directly, based on the Marching Cubes (MC) algorithm, three-dementional graphics of the samples are reconstructed using the VC6.0and OpenGL through OCT cross-sectional images which are obtained in image processing with collected interference signals. That is, the three-dementional graphics of samples can be obtained by superimposing OCT cross-sectional images using the MC algorithm. There are two parts in the three-dementional image reconstruction program. One is the body data processing and the other is three-dementional display section. The body data processing is realized using MC algorithm with C/C++languages. A shape of three-dementional blade is then accomplished using OpenGL3-D Graphics lib in VC6.0platform.Using the designed three-dementional image reconstruction program, a series of three-dementional image reconstruction experiments are carried out. Three-dementional image reconstructions with medical CT images of human head, cross-sectional images in a tranditional OCT system, and cross-sectional images in a wide-field OCT system, respectively, are completed. These results show that the designed three-dementional image reconstruction program could be used in the color wide-field OCT system.In the study on the performance of the color wide-field OCT system, differenct experiment schemes are designed. The resolutions (including transverse and lognitudinal resolutions), investigation depth of the system are tested experimentally. And the performance measurement values for the system are obtained.