Journal ArticleDOI
Advanced coded-aperture imaging system for nuclear medicine.
Nagaaki Ohyama,Toshio Honda,Jumpei Tsujiuchi,Toru Matumoto,Takeshi A. linuma,Kenji Ishimatsu +5 more
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TLDR
An advanced coded imaging system is described, and some results of phantom experiments are presented, and it may be concluded that the new system is useful for practical applications, for example, to nuclear medicine.Abstract:
An advanced coded imaging system is described, and some results of phantom experiments are presented. The advanced method uses a pair of coherent codes (+1 and −1 codes) and has many advantages compared with conventional ones. One of the greatest advantages is that there are no sidelobes in the focal plane and only a few in other planes. Therefore, when an object can be regarded as two-dimensional, it is perfectly reconstructed with high detecting efficiency, and this is successfully simulated by a thyroid phantom with 99mTc. Moreover, this system has an ability to reconstruct tomograms, which is also shown by using ring phantoms piled on one another with some cold spots in their shells. From these experimental results it may be concluded that the new system is useful for practical applications, for example, to nuclear medicine.read more
Citations
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Journal ArticleDOI
Coded aperture imaging with multiple measurements
TL;DR: In this article, a general theory of coded aperture imaging with multiple measurements is presented, and an image reconstruction scheme from the coded images is described that results in a maximum signal-to-noise ratio.
Journal ArticleDOI
Complementary lattice arrays for coded aperture imaging
TL;DR: The concept of complementary lattice arrays is proposed in order to enable a broader range of designs for coded aperture imaging systems and provides a general framework and methods that generate richer and more flexible designs compared to the existing techniques.
Journal ArticleDOI
Speeding Up Image Reconstruction Methods in Coded Mask γ Cameras Using Neural Networks: Application to the EM Algorithm
TL;DR: A method for speeding up non-linear reconstruction of γ-ray coded-mask cameras by making use of a neural network with a back-propagation learning rule.
Journal ArticleDOI
Gamma Radiation Imaging System via Variable and Time-Multiplexed Pinhole Arrays.
Ariel Schwarz,Amir Shemer,Yossef Danan,Rachel Bar-Shalom,Hemy Avraham,Alex Zlotnik,Zeev Zalevsky +6 more
TL;DR: The objectives are to reduce the radioactive dose given to the patient and to preserve or improve SNR, resolution and capturing time while incorporating three-dimensional capabilities in existing gamma imaging systems, based on super-resolved time-multiplexing methods using both variable and moving pinhole arrays.
Journal ArticleDOI
Coded-aperture imaging system for reconstructing tomograms of human myocardium.
Nagaaki Ohyama,Tomoaki Endo,Toshio Honda,Jumpei Tsujiuchi,Toru Matumoto,Takeshi Iinuma,Kenji Ishimatsu +6 more
TL;DR: To increase the detection efficiency and improve the spatial resolution, a coded-aperture imaging method is applied to nuclear medicine, which consists of nine pinholes arranged in a square grid.
References
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Journal ArticleDOI
Fresnel zone plate imaging of gamma rays; theory
TL;DR: The general theory of coded-aperture imaging is presented, first for an arbitrary code and then for an on-axis zone plate, an off-axis Zone Plate, and a one-dimensional zone plate (or linear chirp).
Journal ArticleDOI
Multiplex imaging with multiple-pinhole cameras
TL;DR: In this article, the advantages and problems arising with such a camera are discussed, and expressions are derived to describe the relative efficacy of three exposure/postprocessing schemes using multiple-pinhole cameras.
Journal ArticleDOI
Coded Aperture Imaging with X-rays (Flashing Tomosynthesis)
TL;DR: In this paper, four different versions of flash tomosynthesis are compared, and the obtainable image qualities and other practical features of these four new methods are compared in terms of image quality and image quality.
Journal ArticleDOI
An advanced coded imaging without side lobes
TL;DR: An advanced coded imaging is proposed which makes it possible to clear away the side lobes from reconstructed images by using a pair of coherent codes.
Journal ArticleDOI
Gamma-ray imaging with stochastic apertures.
TL;DR: A method is proposed and analyzed for gamma-ray imaging by stochastic time modulation and cross-correlation and it is seen to provide a theoretical basis for obtaining a smooth three-dimensional point response.
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