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Fast reconstruction of three-dimensional images in Fresnel transform imaging technique using optical imaging system

✍ Scribed by Satoshi Ito; Shingo Kawaharada; Yoshitsugu Kamimura; Yoshifumi Yamada

Publisher
John Wiley and Sons
Year
2002
Tongue
English
Weight
414 KB
Volume
33
Category
Article
ISSN
0882-1666

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✦ Synopsis

Abstract

In this paper, a fast reconstruction of three‐dimensional images, based on the analogy between the expression for the NMR signal in the three‐dimensional Fresnel transform NMR imaging and the expression for light diffraction, is presented. When three‐dimensional imaging is applied to MRI, the problem arises that the computation time for reconstruction is too long, due to the large amount of data. However, the reconstruction time for the spatially continuous cross‐sectional images can be greatly reduced by high‐speed optical operation if the signal is sent to a liquid‐crystal spatial light modulator as a set of Fresnel hologram signals, to be displayed continuously and illuminated by coherent light. In this study, holographic reconstruction is applied to image reconstruction in three‐dimensional Fresnel transform imaging, and an attempt is made to improve the speed of image reconstruction by high‐speed transfer of the obtained signals to the holographic reconstruction system as a set of Fresnel holograms. Thus, the MR cross‐sectional image is reconstructed with the video rate from the three‐dimensional signal data. © 2002 Wiley Periodicals, Inc. Syst Comp Jpn, 33(5): 21–29, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/scj.1124

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