[en] The principle of convolution algorithm is introduced. Based on un-linear interpolation, a new reconstructive method of iterative convolution is proposed. The experimental results show that this method has fast computing speed, good convergence character and high precision of reconstruction

[en] The irradiation damage is an important characteristic of plastic optical fiber. While irradiation, the transmission ration of optical fiber and the relative output of the fluorescence decrease obviously. Irradiation damage can recover gradually by itself. The experimental results have been given out

[en] The outline of nuclear medical imaging technique is described. The principle, characteristics, advantage and disadvantage of each imaging technique and their relationships are also mentioned. Finally, the prospect of modern imaging technique is proposed

[en] In order to improve the accuracy of reconstruction, the effects of beam's width, detector response, sampling and centre deviation on computer tomography are discussed. The experimental results show that these factors effect the accuracy of reconstruction, and may bring about great error in some conditions

[en] By the comprehensive analysis of existing measuring methods, a new method is proposed to measure the nuclear radiation dose field with array absorption-emission computed tomography. The detector based on scintillation optical fiber array and its servo- control system are designed. The weak optical signal is measured by Charge Coupled Devices (CCD) and the formed visual signal is quickly sampled with the method of testing fixed signed points. The reconstruction method of iterative filter back projection and the data renovate based on non-complete projection are proposed to reconstruct dose field more accurately. The filter function is also an important factor in the image reconstruction. The Butter worth filter function is chosen. By adjusting its parameters, the authors have obtained optimum result. Finally, all the experimentation shows that the methods proposed are proper and whole measuring system is advanced and feasible

[en] Radiation damage is an important characteristic of fiber. The article introduces the initial research and result analysis of radiation damage of fiber in high γ ray space. The radiation damage factor which is dependent on the material, purity and other factors has been determined as μ = 0.295