The Experts below are selected from a list of 124095 Experts worldwide ranked by ideXlab platform
Frank J. Rybicki - One of the best experts on this subject based on the ideXlab platform.
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Coronary flow dynamics measured by computed tomography angiography.
Journal of the American College of Cardiology, 2011Co-Authors: Frank J. RybickiAbstract:Multidetector computed tomography (MDCT) technology has rapidly evolved, and coronary imaging is largely responsible for current computed tomography (CT) hardware releases that have extended beyond “64-generation” scanners ([1][1]) to offer superior temporal Resolution, Volume coverage, and
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The “Post-64” Era of Coronary CT Angiography: Understanding New Technology from Physical Principles
Radiologic clinics of North America, 2009Co-Authors: Hansel J. Otero, Michael L. Steigner, Frank J. RybickiAbstract:Multidetector CT now provides noninvasive coronary imaging, and patients with a low or intermediate probability of coronary artery disease can be imaged with radiation levels comparable to catheterization. Cardiac imaging drives rapid progress in CT hardware. To best apply evolving technology, imagers and referring clinicians need a solid understanding of spatial Resolution, temporal Resolution, Volume coverage, and radiation dose. This article defines and discusses interactions between these parameters for state-of-the-art CT.
Hugh D Curtin - One of the best experts on this subject based on the ideXlab platform.
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Experimental Flat-Panel High-Spatial- Resolution Volume CT of the Temporal Bone
2014Co-Authors: Rajiv Gupta, Samit Kumar Basu, W R Ross, H Becker, Armin Horst Pfoh, Soenke H. Bartling, Thomas Brady, Hugh D CurtinAbstract:BACKGROUND AND PURPOSE: A CT scanner employing a digital flat-panel detector is capable of very high spatial Resolution as compared with a multi-section CT (MSCT) scanner. Our purpose was to determine how well a prototypical Volume CT (VCT) scanner with a flat-panel detector system defines fine structures in temporal bone. METHODS: Four partially manipulated temporal-bone specimens were imaged by use of a prototypical cone-beam VCT scanner with a flat-panel detector system at an isometric resolu-tion of 150 m at the isocenter. These specimens were also depicted by state-of-the-art multisection CT (MSCT). Forty-two structures imaged by both scanners were qualitatively assessed and rated, and scores assigned to VCT findings were compared with those of MSCT. RESULTS: Qualitative assessment of anatomic structures, lesions, cochlear implants, and middle-ear hearing aids indicated that image quality was significantly better with VCT (P <.001). Structures near the spatial-Resolution limit of MSCT (e.g., bony covering of the tympanic segment of the facial canal, the incudo-stapedial joint, the proximal vestibular aqueduct, the interscalar septum, and the modiolus) had higher contrast and less partial-Volume effect with VCT. CONCLUSION: The flat-panel prototype provides better definition of fine osseous structure
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experimental flat panel high spatial Resolution Volume ct of the temporal bone
American Journal of Neuroradiology, 2004Co-Authors: Rajiv Gupta, S Bartling, Samit Kumar Basu, W R Ross, H Becker, Armin Horst Pfoh, Thomas J Brady, Hugh D CurtinAbstract:BACKGROUND AND PURPOSE: A CT scanner employing a digital flat-panel detector is capable of very high spatial Resolution as compared with a multi-section CT (MSCT) scanner. Our purpose was to determine how well a prototypical Volume CT (VCT) scanner with a flat-panel detector system defines fine structures in temporal bone. METHODS: Four partially manipulated temporal-bone specimens were imaged by use of a prototypical cone-beam VCT scanner with a flat-panel detector system at an isometric Resolution of 150 μm at the isocenter. These specimens were also depicted by state-of-the-art multisection CT (MSCT). Forty-two structures imaged by both scanners were qualitatively assessed and rated, and scores assigned to VCT findings were compared with those of MSCT. RESULTS: Qualitative assessment of anatomic structures, lesions, cochlear implants, and middle-ear hearing aids indicated that image quality was significantly better with VCT ( P < .001). Structures near the spatial-Resolution limit of MSCT (e.g., bony covering of the tympanic segment of the facial canal, the incudo-stapedial joint, the proximal vestibular aqueduct, the interscalar septum, and the modiolus) had higher contrast and less partial-Volume effect with VCT. CONCLUSION: The flat-panel prototype provides better definition of fine osseous structures of temporal bone than that of currently available MSCT scanners. This study provides impetus for further research in increasing spatial Resolution beyond that offered by the current state-of-the-art scanners.
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experimental flat panel high spatial Resolution Volume ct of the temporal bone
American Journal of Neuroradiology, 2004Co-Authors: Rajiv Gupta, Samit Kumar Basu, W R Ross, H Becker, Armin Horst Pfoh, Thomas J Brady, Soenke H. Bartling, Hugh D CurtinAbstract:BACKGROUND AND PURPOSE: A CT scanner employing a digital flat-panel detector is capable of very high spatial Resolution as compared with a multi-section CT (MSCT) scanner. Our purpose was to determine how well a prototypical Volume CT (VCT) scanner with a flat-panel detector system defines fine structures in temporal bone. METHODS: Four partially manipulated temporal-bone specimens were imaged by use of a prototypical cone-beam VCT scanner with a flat-panel detector system at an isometric Resolution of 150 μm at the isocenter. These specimens were also depicted by state-of-the-art multisection CT (MSCT). Forty-two structures imaged by both scanners were qualitatively assessed and rated, and scores assigned to VCT findings were compared with those of MSCT. RESULTS: Qualitative assessment of anatomic structures, lesions, cochlear implants, and middle-ear hearing aids indicated that image quality was significantly better with VCT (P CONCLUSION: The flat-panel prototype provides better definition of fine osseous structures of temporal bone than that of currently available MSCT scanners. This study provides impetus for further research in increasing spatial Resolution beyond that offered by the current state-of-the-art scanners.
Simon K Warfield - One of the best experts on this subject based on the ideXlab platform.
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motion robust mri through real time motion tracking and retrospective super Resolution Volume reconstruction
International Conference of the IEEE Engineering in Medicine and Biology Society, 2011Co-Authors: Ali Gholipour, Martin Polak, Andre Van Der Kouwe, Erez Nevo, Simon K WarfieldAbstract:Magnetic Resonance Imaging (MRI) is highly sensitive to motion; hence current practice is based on the prevention of motion during scan. In newborns, young children, and patients with limited cooperation, this commonly requires full sedation or general anesthesia, which is time consuming, costly, and is associated with significant risks. Despite progress in prospective motion correction in MRI, the use of motion compensation techniques is limited by the type and amount of motion that can be compensated for, the dependency on the scanner platform, the need for pulse sequence modifications, and/or difficult setup. In this paper we introduce a novel platform-independent motion-robust MRI technique based on prospective real-time motion tracking through a miniature magnetic field sensor and retrospective super-Resolution Volume reconstruction. The technique is based on fast 2D scans that maintain high-quality of slices in the presence of motion but are degraded in 3D due to inter-slice motion artifacts. The sensor, conveniently attached to the subject forehead, provides real-time estimation of the motion, which in turn gives the relative location of the slice acquisitions. These location parameters are used to compensate the inter-slice motion to reconstruct an isotropic high-Resolution Volumetric image from slices in a super-Resolution reconstruction framework. The quantitative results obtained for phantom and volunteer subject experiments in this study show the efficacy of the developed technique, which is particularly useful for motion-robust high-Resolution T2-weighted imaging of newborns and pediatric subjects.
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EMBC - Motion-robust MRI through real-time motion tracking and retrospective super-Resolution Volume reconstruction
Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Inte, 2011Co-Authors: Ali Gholipour, Martin Polak, Andre Van Der Kouwe, Erez Nevo, Simon K WarfieldAbstract:Magnetic Resonance Imaging (MRI) is highly sensitive to motion; hence current practice is based on the prevention of motion during scan. In newborns, young children, and patients with limited cooperation, this commonly requires full sedation or general anesthesia, which is time consuming, costly, and is associated with significant risks. Despite progress in prospective motion correction in MRI, the use of motion compensation techniques is limited by the type and amount of motion that can be compensated for, the dependency on the scanner platform, the need for pulse sequence modifications, and/or difficult setup. In this paper we introduce a novel platform-independent motion-robust MRI technique based on prospective real-time motion tracking through a miniature magnetic field sensor and retrospective super-Resolution Volume reconstruction. The technique is based on fast 2D scans that maintain high-quality of slices in the presence of motion but are degraded in 3D due to inter-slice motion artifacts. The sensor, conveniently attached to the subject forehead, provides real-time estimation of the motion, which in turn gives the relative location of the slice acquisitions. These location parameters are used to compensate the inter-slice motion to reconstruct an isotropic high-Resolution Volumetric image from slices in a super-Resolution reconstruction framework. The quantitative results obtained for phantom and volunteer subject experiments in this study show the efficacy of the developed technique, which is particularly useful for motion-robust high-Resolution T2-weighted imaging of newborns and pediatric subjects.
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robust super Resolution Volume reconstruction from slice acquisitions application to fetal brain mri
IEEE Transactions on Medical Imaging, 2010Co-Authors: Ali Gholipour, Judy A Estroff, Simon K WarfieldAbstract:Fast magnetic resonance imaging slice acquisition techniques such as single shot fast spin echo are routinely used in the presence of uncontrollable motion. These techniques are widely used for fetal magnetic resonance imaging (MRI) and MRI of moving subjects and organs. Although high-quality slices are frequently acquired by these techniques, inter-slice motion leads to severe motion artifacts that are apparent in out-of-plane views. Slice sequential acquisitions do not enable 3-D Volume representation. In this study, we have developed a novel technique based on a slice acquisition model, which enables the reconstruction of a Volumetric image from multiple-scan slice acquisitions. The super-Resolution Volume reconstruction is formulated as an inverse problem of finding the underlying structure generating the acquired slices. We have developed a robust M-estimation solution which minimizes a robust error norm function between the model-generated slices and the acquired slices. The accuracy and robustness of this novel technique has been quantitatively assessed through simulations with digital brain phantom images as well as high-Resolution newborn images. We also report here successful application of our new technique for the reconstruction of Volumetric fetal brain MRI from clinically acquired data.
Richard E. Davis - One of the best experts on this subject based on the ideXlab platform.
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Three‐dimensional high‐Resolution Volume rendering (HRVR) of computed tomography data: Applications to otolaryngology—head and neck surgery
The Laryngoscope, 1991Co-Authors: Richard E. Davis, Marc Levoy, Julian G. Rosenman, Henry Fuchs, Stephen M. Pizer, Andrew L. Skinner, Harold C. PillsburyAbstract:Conventional computed tomographic display formats are not optimal for demonstrating three-dimensional anatomic relationships. In otolaryngology--head and neck surgery these critical relationships are often highly complex, and their complete understanding is essential to a successful surgical outcome. A new computer-generated image display format, high-Resolution Volume rendering (HRVR), facilities the understanding of these critical anatomic relationships by transforming conventional imaging data into clinically relevant 3-D images. Unlike many other 3-D reconstruction algorithms, HRVR suffers minimal data loss in the conversion process, which in turn provides for superior image Resolution. This better allows the application of 3-D technology to small or complicated anatomic structures such as those frequently encountered in otolaryngology--head and neck surgery. Advances in computer-controlled manipulations that further enhance the evaluation of desired pathologic features have been achieved. This pilot study contains representative clinical cases chosen to illustrate the potential utility of HRVR in otolaryngology--head and neck surgery. The authors believe HRVR images will enhance the surgeon's understanding of the 3-D anatomic relationships that exist between critical pathologic features and surrounding vital structures.
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Three-dimensional high-Resolution Volume rendering (HRVR) of computed tomography data: applications to otolaryngology-head and neck surgery.
The Laryngoscope, 1991Co-Authors: Richard E. Davis, Marc Levoy, Julian G. Rosenman, Henry Fuchs, Stephen M. Pizer, A Skinner, H C PillsburgAbstract:Conventional computed tomographic display formats are not optimal for demonstrating three-dimensional anatomic relationships. In otolaryngology--head and neck surgery these critical relationships are often highly complex, and their complete understanding is essential to a successful surgical outcome. A new computer-generated image display format, high-Resolution Volume rendering (HRVR), facilities the understanding of these critical anatomic relationships by transforming conventional imaging data into clinically relevant 3-D images. Unlike many other 3-D reconstruction algorithms, HRVR suffers minimal data loss in the conversion process, which in turn provides for superior image Resolution. This better allows the application of 3-D technology to small or complicated anatomic structures such as those frequently encountered in otolaryngology--head and neck surgery. Advances in computer-controlled manipulations that further enhance the evaluation of desired pathologic features have been achieved. This pilot study contains representative clinical cases chosen to illustrate the potential utility of HRVR in otolaryngology--head and neck surgery. The authors believe HRVR images will enhance the surgeon's understanding of the 3-D anatomic relationships that exist between critical pathologic features and surrounding vital structures.
Rajiv Gupta - One of the best experts on this subject based on the ideXlab platform.
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Experimental Flat-Panel High-Spatial- Resolution Volume CT of the Temporal Bone
2014Co-Authors: Rajiv Gupta, Samit Kumar Basu, W R Ross, H Becker, Armin Horst Pfoh, Soenke H. Bartling, Thomas Brady, Hugh D CurtinAbstract:BACKGROUND AND PURPOSE: A CT scanner employing a digital flat-panel detector is capable of very high spatial Resolution as compared with a multi-section CT (MSCT) scanner. Our purpose was to determine how well a prototypical Volume CT (VCT) scanner with a flat-panel detector system defines fine structures in temporal bone. METHODS: Four partially manipulated temporal-bone specimens were imaged by use of a prototypical cone-beam VCT scanner with a flat-panel detector system at an isometric resolu-tion of 150 m at the isocenter. These specimens were also depicted by state-of-the-art multisection CT (MSCT). Forty-two structures imaged by both scanners were qualitatively assessed and rated, and scores assigned to VCT findings were compared with those of MSCT. RESULTS: Qualitative assessment of anatomic structures, lesions, cochlear implants, and middle-ear hearing aids indicated that image quality was significantly better with VCT (P <.001). Structures near the spatial-Resolution limit of MSCT (e.g., bony covering of the tympanic segment of the facial canal, the incudo-stapedial joint, the proximal vestibular aqueduct, the interscalar septum, and the modiolus) had higher contrast and less partial-Volume effect with VCT. CONCLUSION: The flat-panel prototype provides better definition of fine osseous structure
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experimental flat panel high spatial Resolution Volume ct of the temporal bone
American Journal of Neuroradiology, 2004Co-Authors: Rajiv Gupta, S Bartling, Samit Kumar Basu, W R Ross, H Becker, Armin Horst Pfoh, Thomas J Brady, Hugh D CurtinAbstract:BACKGROUND AND PURPOSE: A CT scanner employing a digital flat-panel detector is capable of very high spatial Resolution as compared with a multi-section CT (MSCT) scanner. Our purpose was to determine how well a prototypical Volume CT (VCT) scanner with a flat-panel detector system defines fine structures in temporal bone. METHODS: Four partially manipulated temporal-bone specimens were imaged by use of a prototypical cone-beam VCT scanner with a flat-panel detector system at an isometric Resolution of 150 μm at the isocenter. These specimens were also depicted by state-of-the-art multisection CT (MSCT). Forty-two structures imaged by both scanners were qualitatively assessed and rated, and scores assigned to VCT findings were compared with those of MSCT. RESULTS: Qualitative assessment of anatomic structures, lesions, cochlear implants, and middle-ear hearing aids indicated that image quality was significantly better with VCT ( P < .001). Structures near the spatial-Resolution limit of MSCT (e.g., bony covering of the tympanic segment of the facial canal, the incudo-stapedial joint, the proximal vestibular aqueduct, the interscalar septum, and the modiolus) had higher contrast and less partial-Volume effect with VCT. CONCLUSION: The flat-panel prototype provides better definition of fine osseous structures of temporal bone than that of currently available MSCT scanners. This study provides impetus for further research in increasing spatial Resolution beyond that offered by the current state-of-the-art scanners.
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experimental flat panel high spatial Resolution Volume ct of the temporal bone
American Journal of Neuroradiology, 2004Co-Authors: Rajiv Gupta, Samit Kumar Basu, W R Ross, H Becker, Armin Horst Pfoh, Thomas J Brady, Soenke H. Bartling, Hugh D CurtinAbstract:BACKGROUND AND PURPOSE: A CT scanner employing a digital flat-panel detector is capable of very high spatial Resolution as compared with a multi-section CT (MSCT) scanner. Our purpose was to determine how well a prototypical Volume CT (VCT) scanner with a flat-panel detector system defines fine structures in temporal bone. METHODS: Four partially manipulated temporal-bone specimens were imaged by use of a prototypical cone-beam VCT scanner with a flat-panel detector system at an isometric Resolution of 150 μm at the isocenter. These specimens were also depicted by state-of-the-art multisection CT (MSCT). Forty-two structures imaged by both scanners were qualitatively assessed and rated, and scores assigned to VCT findings were compared with those of MSCT. RESULTS: Qualitative assessment of anatomic structures, lesions, cochlear implants, and middle-ear hearing aids indicated that image quality was significantly better with VCT (P CONCLUSION: The flat-panel prototype provides better definition of fine osseous structures of temporal bone than that of currently available MSCT scanners. This study provides impetus for further research in increasing spatial Resolution beyond that offered by the current state-of-the-art scanners.
