نتایج جستجو برای: computed tomography iterative image reconstruction
تعداد نتایج: 762646 فیلتر نتایج به سال:
Since Computed Tomography (CT) became commercially available, the number of CT procedures has increased rapidly. As we are aware that with the development of CT it is widely used and we have huge concerns regarding the risk of malignancies induced by the application of medical ionizing radiation [1]. Although automatic tube current modulation has lead more balanced image quality [2], problem st...
Electrical capacitance tomography (ECT) is used to obtain information about the distribution of a mixture of dielectric materials inside a vessel or pipe. ECT has several advantages over other reconstruction algorithms and has found many applications in the industrial fields. However, there are some difficulties with image reconstruction in ECT: The relationship between the permittivity distrib...
PURPOSE Iterative projection reconstruction algorithms are currently the preferred reconstruction method in proton computed tomography (pCT). However, due to inconsistencies in the measured data arising from proton energy straggling and multiple Coulomb scattering, the noise in the reconstructed image increases with successive iterations. In the current work, the authors investigated the use of...
3D Cone Beam Computed Tomography is a highly investigated field, nowadays. Both analytical and iterative methods for tomographic reconstruction have been proposed. This paper compares two such CBCT image reconstruction algorithms, the FDK and the SART, in terms of their performances when a limited number of projections is used. Increased angular step between projections, allows dose reduction a...
OBJECTIVE To prospectively evaluate image quality and radiation dose using a low-dose computed tomography angiography protocol and iterative image reconstruction for high-pitch dual-source CT-angiography (DSCTA) of the supraaortic arteries. MATERIAL AND METHODS DSCTA was performed in 42 patients, using either 120 kVp tube voltage, 120 mAS tube current, 2.4 pitch and filtered back projection, ...
A maximum likelihood approach to emission image reconstruction from projections. Maximum likelihood from incomplete data via the EM algorithm. " A theoretical study of some maximum likelihood algorithms for emission and transmission tomography. Attenuation compensation of cone beam SPECT images using maximum likelihood reconstruction. Three-dimensional SPECT reconstruction of combined cone beam...
IntroductionThe utility of evaluating a sagittal view CT the spine is well-known. In many clinical cases, includes noise generated from surrounding objects and may degrade image quality. Iterative reconstruction (IR) techniques are useful for reduction; however, they can reduce spatial resolution. The aim this study was to evaluate effectiveness adaptive statistical iterative (ASiR) generating ...
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