نتایج جستجو برای: 4d image reconstruction

تعداد نتایج: 490434  

2001
Jovan G. Brankov Yongyi Yang Manoj V. Narayanan Miles N. Wernick

† Research supported by NIH/NHLBI Grant HL65425. Abstract—In this paper we present two 4D motion-compensated reconstruction algorithms for gated cardiac SPECT. The algorithms are based on a deformable content-adaptive mesh model, a compact image representation that is well suited for motion tracking of non-rigid objects like the heart. In this paper we introduce a reconstruction method using in...

Journal: :iranian journal of fuzzy systems 2004
kaoru hirota hajime nobuhara kazuhiko kawamoto shin-ichi yoshida

the pioneer work of image compression/reconstruction based onfuzzy relational equations (icf) and the related works are introduced. theicf regards an original image as a fuzzy relation by embedding the brightnesslevel into [0,1]. the compression/reconstruction of icf correspond to thecomposition/solving inverse problem formulated on fuzzy relational equations.optimizations of icf can be consequ...

Journal: :Computerized medical imaging and graphics : the official journal of the Computerized Medical Imaging Society 2017
Nicolas A. Karakatsanis Charalampos Tsoumpas Habib Zaidi

Bulk body motion may randomly occur during PET acquisitions introducing blurring, attenuation-emission mismatches and, in dynamic PET, discontinuities in the measured time activity curves between consecutive frames. Meanwhile, dynamic PET scans are longer, thus increasing the probability of bulk motion. In this study, we propose a streamlined 3D PET motion-compensated image reconstruction (3D-M...

Journal: :AJNR. American journal of neuroradiology 2017
C Sandoval-Garcia P Yang T Schubert S Schafer S Hetzel A Ahmed C Strother

BACKGROUND AND PURPOSE 4D-DSA is a time-resolved technique that allows viewing of a contrast bolus at any time and from any desired viewing angle. Our hypothesis was that the information content in a 4D-DSA reconstruction was essentially equivalent to that in a combination of 2D acquisitions and a 3D-DSA reconstruction. MATERIALS AND METHODS Twenty-six consecutive patients who had both 2D- an...

Journal: :AJNR. American journal of neuroradiology 2005
Motoharu Hayakawa Kazuhiro Katada Hirofumi Anno Shuei Imizu Junichi Hayashi Keiko Irie Makoto Negoro Yoko Kato Tetsuo Kanno Hirotoshi Sano

Electrocardiographically (ECG) gated multisection helical CT images were obtained in 23 patients with ruptured intracranial aneurysms. 4D-CTA (3D CT angiography plus phase data) images were generated by ECG-gated reconstruction. Four patients showed pulsation of an aneurysmal bleb. Clipping was performed in two of these patients, and the rupture site matched the pulsatile bleb seen in 4D-CTA.

Journal: :Journal of magnetic resonance imaging : JMRI 2012
Thomas M Grist Charles A Mistretta Charles M Strother Patrick A Turski

The introduction of digital subtraction angiography (DSA) in 1980 provided a method for real time 2D subtraction imaging. Later, 4D magnetic resonance (MR) angiography emerged beginning with techniques like Keyhole and time-resolved imaging of contrast kinetics (TRICKS) that provided frame rates of one every 5 seconds with limited spatial resolution. Undersampled radial acquisition was subseque...

Journal: :Journal of the American Chemical Society 2005
Brian E Coggins Ronald A Venters Pei Zhou

Projection-reconstruction (PR) NMR enables rapid collection of multidimensional NMR data. NOESY represents a particularly difficult challenge for currently existing reconstruction algorithms, as it requires the quantitative reconstruction of an unknown number of peaks, at full sensitivity. We have demonstrated the successful application of PR-NMR to NOESY by determining the 4D methyl/amide NOES...

Journal: :Comput. Graph. Forum 2017
Qian Zheng Xiaochen Fan Minglun Gong Andrei Sharf Oliver Deussen Hui Huang

Flower blooming is a beautiful phenomenon in nature as flowers open in an intricate and complex manner whereas petals bend, stretch and twist under various deformations. Flower petals are typically thin structures arranged in tight configurations with heavy self-occlusions. Thus, capturing and reconstructing spatially and temporally coherent sequences of blooming flowers is highly challenging. ...

E. Raeisi, H. Rajabi, S.M.R. Aghamiri,

ABTRACT Background: In nuclear medicine, phantoms are mainly used to evaluate the overall performance of the imaging systems and practically there is no phantom exclusively designed for the evaluation of the software performance.  In this study the Hoffman brain phantom was used for quantitative evaluation of reconstruction techniques. The phantom is modified to acquire t...

Journal: :iranian journal of nuclear medicine 0
hojjat mahani radiation application research school, nuclear science and technology research institute, tehran, iran gholamreza raisali radiation application research school, nuclear science and technology research institute, tehran, iran alireza kamali-asl radiation medicine department, shahid beheshti university, tehran, iran mohammad reza ay research center for molecular and cellular imaging, tehran university of medical science, tehran, iran

introduction:it is well-recognized that collimator-detector response (cdr) is the main image blurring factor in spect.  in this research, we compensated the images for cdr in molecular spect by using stir reconstruction framework. methods: to assess resolution recovery capability of the stir, a phantom containing five point sources along with a micro derenzo phantom were investigated. influence...

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