The Attenuated Radon Transform: Application to Single-photon Emission Computed Tomography in the Presence of a Variable Attenuating Medium
ثبت نشده
چکیده
....
منابع مشابه
An Analytical Inversion of the Nonuniformly Attenuated Radon Transform With Variable Focal-Length Fan-Beam Collimators
Single photon emission computed tomography (SPECT) is based on the measurement of radiation emitted by a radiotracer injected into the patient. Because of photoelectric absorption and Compton scatter, the gamma photons are attenuated inside the body before arriving at the detector. A quantitative reconstruction must consider the attenuation, which is usually nonuniform. Novikov has derived an e...
متن کاملA new approach towards simultaneous activity and attenuation reconstruction in emission tomography
In single photon emission computed tomography (SPECT) one is interested in reconstructing the activity distribution f of some radiopharmaceutical. The data gathered suffer from attenuation due to the tissue density μ. Each imaged slice incorporates noisy sample values of the nonlinear attenuated Radon transform A(f,μ)(ω, s) = ∫ ∞ −∞ f (sω⊥ + tω) exp (
متن کاملAnalytical Solution to 3D SPECT Reconstruction with Non-uniform Attenuation, Scatter, and Spatially-variant Resolution Variation for Variable Focal-length Fan-beam Collimators
In the past decades, analytical (non-iterative) methods have been extensively investigated and developed for the reconstruction of three-dimensional (3D) single-photon emission computed tomography (SPECT). However, it becomes possible only recently when the exact analytic non-uniform attenuation reconstruction algorithm was derived. Based on the explicit inversion formula for the attenuated Rad...
متن کاملFast numerical inversion of the attenuated Radon transform with full and partial measurements
We propose a numerical method to simulate and invert the two-dimensional attenuated Radon transform (AtRT) from full (360◦) or partial (180◦) measurements. The method is based on an extension of the fast slant stack algorithm developed for the Radon transform. We show that the algorithm offers robust and fast inversion of the AtRT for a wide class of synthetic sources and absorptions. The compl...
متن کاملMonte Carlo Study of the Effect of Backscatter Materail Thickness on 99mTc Source Response in Single Photon Emission Computed Tomography
Introduction SPECT projections are contaminated by scatter radiation, resulting in reduced image contrast and quantitative errors. Backscatter constitutes a major part of the scatter contamination in lower energy windows. The current study is an evaluation of the effect of backscatter material on FWHM and image quality investigated by Monte Carlo simulation. Materials and Methods SIMIND program...
متن کامل