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 3929 for “"Computed"”.
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Computed Tomographic Imaging Spectrometry
A Computed Tomographic Imaging Spectrometer (CTIS) is an imaging spectrometer which can acquire a hyper-spectral data set in a single snapshot (one focal plane array integration time) with no moving parts. A specially designed dispersing element, which separates light from the three-dimensional …
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Computed Behavior of Coupled Shear Walls
Made available in DSpace on 2014-12-13T19:31:39Z (GMT). No. of bitstreams: 1 7726759.pdf: 5469785 bytes, checksum: 3a66cd28b06c046f28c4829a1171a745 (MD5) Previous issue date: 1977
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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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Multichannel Methods for Restoration in Computed Imaging
… addresses data-driven image restoration for computed imaging systems. The work is focused on problems in two imaging modalities: the autofocus problem in synthetic aperture radar (SAR), and the problem of estimating coil sensitivities in parallel magnetic resonance imaging (PMRI). A common …
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In vivo human computed optical interferometric tomography
… and algorithms necessary to perform in vivo computed optical interferometric tomography. Computed imaging has made great advances in a wide variety of fields, greatly improving the diagnostic capability of each underlying imaging modality. Computed imaging techniques such as defocus and …
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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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Optimisation of computed radiography chest imaging utilising a novel simulation technique derived from real patient computed tomography data sets
… computer algorithm that utilises real patient computed tomography (CT) data sets is presented. The algorithm uses a ray casting DRR calculation method to project X-ray pencil beams through CT data and derive the photon energy absorbed in a virtual computed radiography (CR) phosphor. Radiation …
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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
… new optical tomography, named optical coherence computed tomography: optical CCT), which overcomes several major limitations of OCT. OCT relies on singly backscattered photons to obtain high-resolution images. Its image quality degrades fast with the increase of the depth, because the multiply …
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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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