Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 886 for “"Computed tomography"”.
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Spectral Computed Tomography at High Photon Fluxes
The development of pixelated photon counting semiconductor detectors enables to resolve the spectral composition of the incident photons in X-ray imaging, provided that the detector is operated in the absence of pulse pile-up and sensor polarisation. The purpose of this study is to examine the …
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Image Reconstruction of the Speed of Sound and Initial Pressure Distributions in Ultrasound Computed Tomography and Photoacoustic Computed Tomography
<p>Ultrasound computed tomography (USCT) and photoacoustic computed tomography (PACT) are two emerging imaging modalities that have a wide range of potential applications from pre-clinical small animal imaging to cancer screening in human subjects. USCT is typically employed to measure acoustic …
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Cone Beam Optical Computed Tomography-Based Gel Dosimetry
… optical readout tools such as cone beam optical computed tomography (CT) in combination with stable and reliable low-toxicity gel dosimeters is one key step in this process. In this thesis, the performance capabilities and limitations of the two main classes of cone beam optical CT-based …
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Dose and image quality considerations in computed tomography
The increased use of Computed Tomography as an imaging modality is of concern because of the growing body of evidence linking radiation exposure to cancer incidence. However, a framework does not yet exist for balancing the immediate needs of the clinical task (image quality) with future risks due …
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Cone-Beam Computed Tomography and Orthodontics: Awareness Assessment
… knowledge and understanding of Cone-Beam Computed Tomography (CBCT) technology as well as awareness of the implications of CBCT use, including risk assessment, radiation dose estimation, diagnostic utility, and issues of informed consent. It is incumbent on the profession to understand how …
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Dynamic Cone-beam Reconstruction for Perfusion Computed Tomography
Perfusion CT (Computed Tomography) is a dynamic imaging technique whose aim is to assess the blood supply to tissue. The limited field of view of current CT detectors restricts its use to perfusion studies of a small volume. The introduction of large area detectors in CT, however, will allow …
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Competence and Professional Advancement in Computed Tomography (ComPACT)
… what the diagnostic radiography workforce in Computed Tomography (CT) need to know and be able to do at different career stages. It is unknown whether existing UK educational and practice frameworks support CT roles, or how organisational role descriptors constitute CT competence. Aims: The …
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Robust and efficient methods for proton computed tomography.
Proton computed tomography (pCT) is a recent promising imaging modality with the goal of generating accurate 3D maps of relative stopping power (RSP) with respect to water. Since the early developments of this imaging technique in 1970's, there have been significant improvements regarding the …
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Divergent Beam Ultrasound Computed Tomography for Differential Thermography
Made available in DSpace on 2014-12-15T19:05:01Z (GMT). No. of bitstreams: 1 8600203.pdf: 7828000 bytes, checksum: 226dd7e3f9e4555d5fa8aca620945417 (MD5) Previous issue date: 1985
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Photoacoustic Reporter Gene Imaging And Optical Coherence Computed Tomography
… imaging: PAI) and optical coherence tomography: OCT) are the two fastest growing branches. PAI measures the laser-induced acoustic wave, and produces high-resolution images of the optically absorbing features of tissue at multiple length-scales. OCT detects singly backscattered …
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Multi-Material Discrimination Using Photon Counting Spectral Computed Tomography
… mapping of multiple materials with spectral computed tomography (CT) has applications in many areas including biomedical imaging, defense and security, geophysical imaging of rock composition and in materials and chemical imaging. Dual or multi-kVp x-ray exposure when using an …
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Area Based Fan Beam Projection Model for Computed Tomography
<p>Computed tomography (CT) is image reconstruction of objects using computer processed transmission or reflection data, usually referred to as projection data, from x-ray scanning. This projection data is often modeled using line integrals, but x-rays are of finite width in reality, so the …
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Scattering and Absorption of Photons in Emission Computed Tomography
… for improving image quality in emission computed tomography (ECT).
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Three-dimensional image reconstruction in breast ultrasound computed tomography
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2027-05-01
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Hip fracture risk predictions by x-ray computed tomography
Thesis (Ph. D.)--Massachusetts Institute of Technology, Harvard-MIT Division of Health Sciences and Technology Program in Medical Engineering and Medical Physics, 1988.
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Collimator width Optimization in X-ray Luminescent Computed Tomography
X-ray Luminescent Computed Tomography (XLCT) is a new imaging modality which is under extensive trials at present. The modality works by selective excitation of X-ray sensitive nanophosphors and detecting the optical signal thus generated. This system can be used towards recreating high quality …
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COMPRESSIVE SENSING BASED IMAGE RECONSTRUCTION FOR COMPUTED TOMOGRAPHY DOSE REDUCTION
… exposure is one of the major concerns in the computed tomography (CT) field. Few-view reconstruction using iterative algorithm is an important strategy to reduce the radiation dose. In the iterative CT reconstruction, the projection / backprojection model plays an important role in the overall …
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Three-dimensional image reconstruction of skeletal tissue from computed tomography
… such as MRI (magnetic resonance imaging) and CT (computed tomography).;In this thesis, we develop a simple process for the three dimensional image reconstruction of the human knee, starting from computed tomography scans. Designing a digital image processing technique which successfully separates …
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Three-Dimensional Photoacoustic Computed Tomography: Imaging Models and Reconstruction Algorithms
<p>Photoacoustic computed tomography: PACT), also known as optoacoustic tomography, is a rapidly emerging imaging modality that holds great promise for a wide range of biomedical imaging applications. Much effort has been devoted to the investigation of imaging physics and the optimization of …
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Image Reconstruction in Photoacoustic Computed Tomography with Acoustically Heterogeneous Media
<p>Photoacoustic computed tomography (PACT), also known as optoacoustic or thermoacoustic tomography, is a rapidly emerging hybrid imaging modality that combines optical image contrast with ultrasound detection. The majority of currently available PACT image reconstruction algorithms are based on …
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