On-Line Reconstruction of NMR Images Using a Liquid Crystal-Spatial Light Modulator.
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概要
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MRI fast-imaging technique such an echo-planar imaging (EPI) has begun to be employed in commercial MRI system and data acquisition time may be shorten to less than 100ms. With this imaging system, if MRI images were reconstructed in a moment, we would be allowed to get a real-time moving image. Reconstructing images in synchronization with data acquisition may be executed numerically by using Digital Signal Processing board or parallel combined CPU in the case of small data-size. However, these methods even take a few time to reconstruct images and it may be the limiting factor for the real-time imaging. Optical information processing has the potential to overcome the time limitation related to image reconstruction, because optical computation has the advantage of very fast parallel processing. Holography is the most popular technique for optically reconstructing images and has the potential of producing a three-dimensional image. The expression of NMR signal in Fresnel transform technique is similar equation to that of the Fresnel diffraction equation in light. Therefore, holographic reconstruction of NMR images is feasible, making a hologram from NMR spin-echo signal and reconstructing images using a coherent optical system. In this paper, we describe a new method of opto-electronic reconstruction of NMR images using a liquid crystal-spatial light modulator (LC-SLM) as a hologram display, addressing a hologram electrically and using a coherent optical system. Experimental results show considerably good images are obtained even from the commercially available LC-SLM. The results also indicate a real-time reconstruction of NMR images by combining the NMR fast-speed imaging technique, because the hologram pattern on the LC-SLM is refreshed at a video-rate that is fully catch up with the data-acquisition time of high-speed imaging.
- 一般社団法人 日本生体医工学会の論文
一般社団法人 日本生体医工学会 | 論文
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