38 Results for 'guang-hong chen'
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Technology
System And Method For Simultaneous Image Artifact Reduction And Tomographic Reconstruction Of Images Depicting Temporal Contrast Dynamics
Described here is a system and method for image reconstruction that can automatically and iteratively produce multiple images from one set of acquired data, in which each of these multiple images corr...
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Guang-Hong Chen | P160119US01
Technology
System And Method For High-Temporal Resolution, Time-Resolved Cone Beam Ct Angiography
A system and method for reconstructing an image using a cone-beam computed tomography (CT) imaging system includes acquiring data from a subject with the CT imaging system using a limited scan range t...
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Guang-Hong Chen, Charles Strother | P160332US01
Technology
Calculation Of Additional Projection Data From Projection Data Acquired With A Divergent Beam
A data consistency condition is derived for an array of attenuation values acquired with a divergent beam. Using this data consistency condition, estimates of selected attenuation values can be calcul...
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Guang-Hong Chen | P06161US
Technology
Systems And Methods For Artifact Removal For Computed Tomography Imaging
An imaging system includes a computed tomography (CT) acquisition unit and at least one processor. The CT acquisition unit includes an X-ray source and a CT detector configured to collect CT imaging d...
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Guang-Hong Chen, Jiang Hsieh | P150065US01
Technology
Eliminating CT Image Artifacts Using Artifact ‘Dictionaries’
In modern computed tomography (CT) imaging, a number of non-ideal physical conditions may cause artifacts in the reconstructed images. Mitigation or elimination of image artifacts has been a time- and...
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Guang-Hong Chen, Jiang Hsieh | P160118US01
Technology
Dual-Energy CT Cuts Costs, Radiation Dose
Dual-energy computed tomography (CT) was first proposed in the 1970s but has wavered in practical usage ever since. In essence, the process employs two different X-ray spectra (i.e., a high energy lev...
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Guang-Hong Chen | P130360US01
Technology
Statistical Imaging Reconstruction Is Faster, Cuts Noise
In recent years, statistical imaging reconstruction has been introduced in clinics by different computed tomography (CT) manufacturers as a means to reduce radiation dose levels. Essentially, the meth...
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Guang-Hong Chen, Jie Tang | P130341US01
Technology
X-Ray Phase Contrast Imaging Using Standard Equipment
Phase contrast imaging exploits differences in the refractive index of materials to differentiate and image them. Recently, X-ray phase contrast imaging has attracted a great deal of attention. In the...
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Guang-Hong Chen | P130340US01
Technology
Reconstruction Method for Increasing Image Resolution of Computed Tomography Systems
Computed tomography (CT) systems are medical imaging devices that use X-rays to image a patient internally. An X-ray source sends parallel beams through the patient. The X-ray absorption/scattering,...
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Guang-Hong Chen, Jiang Hsieh | P06100US
Technology
Ultra Low Radiation Dose Computed Tomography Scanner for X-ray Mammography
Breast cancer is the most common cancer among women today with all women having approximately an 11 to12 percent chance of developing this cancer and a 30 to 40 percent chance of death after developme...
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Guang-Hong Chen | P05204US
Technology
Cone-Beam Filtered Backprojection Image Reconstruction Method for Short Trajectories
In computed tomography (CT) imaging, divergent beam data acquisition modes have the potential to speed up data acquisition and shorten scan time. However, image reconstruction from divergent-beam proj...
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Guang-Hong Chen | P05176US
Technology
Fan- and Cone-Beam Image Reconstruction Using Filtered Backprojection of Differentiated Projection
The Feldkamp (FDK) algorithm is widely used for image reconstruction for cone-beam projections, which are utilized in three-dimensional computed tomography (CT). However, because current FDK-type algo...
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Guang-Hong Chen | P04316US
Technology
Correction of CT Images for Truncated or Incomplete Projections
In clinical computed tomography (CT) practice, image artifacts arise when some data is missing or inconsistent, such as in the case of large patients that extend beyond the imaging field of view or pa...
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Guang-Hong Chen | P04315US