Journal ArticleDOI
"Positology"-the search for suitable detector arrangements for a positron ECT with continuous rotation
Eiichi Tanaka,Norimasa Nohara,Mikio Yamamoto,Takehiro Tomitani,Hideo Murayama,Kenji Ishimatsu,Katsumi Takami +6 more
Reads0
Chats0
TLDR
In this paper, the authors proposed a continuously rotating positron ECT system, in which the detectors are arranged on a circular ring with "non-uniform" spacing so as to provide much finer sampling interval in the projections than the conventional circular ring system.Abstract:
This paper proposes a continuously rotating positron ECT system, in which the detectors are arranged on a circular ring with "non-uniform" spacing so as to provide much finer sampling interval in the projections than the conventional circular ring system. The address signals on the coincidence events are read out through a rotary photo-coupler, and the detector system can be rotated at a desired speed. Suitable detector arrangements are searched which provide sufficiently fine sampling interval with reasonable sampling density uniformity. Assuming about 50 detectors are arranged on a circle, the sampling characteristics of various detector arrangements have been examined. An iterative search method has also been applied to find a reasonable arrangement. The best arrangement has been obtained by the iterative method. It has an effective sampling interval of the order of (1/200)R, where R is the radius of the detector array, and the sampling density uniformity after 5-point smoothing is -7.8 ˜/spl I.chemo/18 % in the range of /spl I.chemo/ R/2.read more
Citations
More filters
Journal ArticleDOI
Image Reconstruction and Noise Evaluation in Photon Time-of-Flight Assisted Positron Emission Tomography
TL;DR: In this article, a reconstruction algorithm for TOF-positron computed tomography (PCT) based on the back-projection with 1-dimensional weight and 2-dimensional filtering is presented.
Journal ArticleDOI
Single crystals for radiation detectors
TL;DR: In this paper, recent progress in crystal growth technology is described for typical alkali (alkali-earth) halide and oxide scintillation crystals such as NaI:Tl, CsI: Tl, Bismuth germanate (BGO), Bi4Ge3O12, Cadmium tungstate (CWO), CdWO4, and cerium-doped gadolinium silicate (GSO:Ce).
Journal ArticleDOI
Imaging Properties of a Positron Tomograph with 280 Bgo Crystals
TL;DR: The basic imaging properties of the Donner 280-BGO-Crystal positron tomograph were measured and compared with the same system when it was equipped with 280 NaI(T1) crystals, which results in an overall reduction in the fraction of accidental events recorded.
Journal ArticleDOI
Positron tomography and nuclear magnetic resonance imaging.
TL;DR: New developments in emission tomography, nuclear magnetic resonance imaging, and in vivo spectroscopy offer new horizons for medical research and clinical activities.
Journal ArticleDOI
A Fast Reconstruction Algorthm for Stationary Positron Emission Tomography Based on a Modified EM Algorithm
TL;DR: The algorithm is basically an enhanced EM (expectation maximization) algorithm with improved frequency response and is promising to achieve significant saving in computation compared to the standard EM algorithm.
References
More filters
Journal ArticleDOI
Circular Ring Transverse Axial Positron Camera for 3-Dimensional Reconstruction of Radionuclides Distribution
Zang-Hee Cho,J. Chan,L. Eriksson +2 more
TL;DR: In this article, a positron camera system was designed to record the coincidences from 2 × 736 (or 2 × 1116) detector combinations in a circular array with a single layer of 64 (or 72) NaI(T1) crystals and PM tubes.
Journal ArticleDOI
High Resolution Computed Tomography of Positron Emitters
TL;DR: Measurements of imaging and background rates under various operating conditions are presented and it is shown that 1.5 million events are sufficient to reliably image 3.5 mm hot spots with 14 mm center-to-center spacing and isolated 9 mm diameter cold spots in phantoms 15-20 cm in diameter.
Journal ArticleDOI
A Computer Assisted Ringdector Positron Camera System for Reconstruction Tomography of the Brain
TL;DR: A ring detector positron camera system for brain metabolism studies is being constructed at the Institute of Physics, University of Stockholm, in collaboration with the Departments of Neuroradiology and clinical Neurophysiology.
Journal ArticleDOI
A computer assisted ringdetector positron camera system for reconstruction tomography of the brain
TL;DR: A ring detector positron camera system for brain metabolism studies is being constructed at the Institute of Physics, University of Stockholm, in collaboration with the Departments of Neuroradiology and clinical Neurophysiology.
Journal ArticleDOI
Correction functions and statistical noises in transverse section picture reconstruction.
Eiichi Tanaka,Takeshi Iinuma +1 more
TL;DR: An analysis of image reconstruction with one- and two-dimensional convolution methods is presented in an outline of the relationship among the correction functions, the point spread function and the statistical noise.
Related Papers (5)
Circular Ring Transverse Axial Positron Camera for 3-Dimensional Reconstruction of Radionuclides Distribution
Zang-Hee Cho,J. Chan,L. Eriksson +2 more