Estimation of Fan Beam and Parallel Beam Parameters in a Wire Mesh Design
نویسندگان
چکیده
منابع مشابه
Revisit of combined parallel-beam/cone-beam or fan-beam/cone-beam imaging.
PURPOSE This aim of this paper is to revisit the parallel-beam/cone-beam or fan-beam/cone-beam imaging configuration, and to investigate whether this configuration has any advantages. METHODS Twenty years ago, it was suggested to simultaneously use a parallel-beam (or a fan-beam) collimator and a cone-beam collimator to acquire single photon emission computed tomography data. The motivation w...
متن کاملA novel extension of the parallel-beam projection-slice theorem to divergent fan-beam and cone-beam projections.
The general goal of this paper is to extend the parallel-beam projection-slice theorem to divergent fan-beam and cone-beam projections without rebinning the divergent fan-beam and cone-beam projections into parallel-beam projections directly. The basic idea is to establish a novel link between the local Fourier transform of the projection data and the Fourier transform of the image object. Anal...
متن کاملEvaluation of the Reconstruction Parameters of Brain Dopamine Transporter SPECT Images Obtained by a Fan Beam Collimator: A Comparison with Parallel-hole Collimators
Objective(s): The purpose of this study was to examine the optimal reconstruction parameters for brain dopamine transporter SPECT images obtained with a fan beam collimator and compare the results with those obtained by using parallel-hole collimators.Methods: Data acquisition was performed using two SPECT/CT devices, namely a Symbia T6 and an Infinia Hawkeye 4 (device A and B) equipped with fa...
متن کاملEstimation of Missing Fan-Beam Projections using Frequency Consistency Conditions
Reducing radiation dose is a crucial problem in computed tomography. One approach is to undersample the projections and compensate for the missing ones using an estimation method. In this paper, we introduce a novel method to estimate missing projections in fan-beam geometry. The estimation is done by iteratively enforcing consistency conditions of the sinogram’s Fourier-Transform. The complete...
متن کاملImage reconstruction from fan-beam and cone-beam projections
This thesis addresses the problem of reconstructing static objects in 2D and 3D transmission computed tomography (CT). After reviewing the classical CT reconstruction theory, we discuss and thoroughly evaluate various novel reconstruction methods, two of which are original. Our first original approach is for 2D CT reconstruction from full-scan fan-beam data, i.e., for 2D imaging in the geometry...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Nuclear Medicine Technology
سال: 2012
ISSN: 0091-4916
DOI: 10.2967/jnmt.111.089904