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 144 for “"SPECT"”.
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Epileptogeenisen alueen paikantaminen SPECT-kuvantamisella tilastollisin menetelmin
Tässä työssä tutkittiin Ictal-Interictal SPECT Analyzed by SPM (ISAS)-menetelmän käyttöä epileptogeenisen alueen paikantamisessa. Kohtauksen aikana epileptogeenisellä alueella esiintyy usein hyperperfuusiota, jota voidaan tutkia SPECT-kuvantamisella. Kuvaamalla epileptisen kohtauksen aikainen …
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The development of MRI-compatible SPECT system
… and nuclear imaging techniques such as PET and SPECT have received great attentions. MRI provides high-resolution anatomical and functional information along with an exquisite soft tissue contrast. Nuclear techniques could provide an excellent sensitivity to radio-labeled tracers that could be …
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Development of Spect and Ct Tomographic Image Reconstruction
… reconstruction algorithms and protocols for both SPECT and micro CT data. Major contributions of this work to SPECT reconstruction include formulation and implementation of fully three-dimensional voxel-based system matrix in parallel-beam, fan-beam, and cone-beam collimator geometries while …
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Digital Waveform Acquisition and Adaptive Collimation Methods for SPECT
Single Photon Emission Computed Tomography (SPECT) is a minimally invasive, functional imaging modality mainly used clinically in cardiology, oncology, and neurology. SPECT has also been particularly useful in preclinical settings because of the ability to perform longitudinal studies on animal …
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List Mode Reconstruction in X-Ray CT and SPECT Imaging
… single photon emission computed tomography (SPECT) system. The results demonstrate superior reconstruction quality when using list mode data compared to binned data, with the difference being particularly pronounced under low-dose conditions. The second part of this thesis extends the …
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Fixed and Adaptive Multiple-Pinhole Apertures for Brain SPECT Imaging
Single-Photon Emission Computed Tomography (SPECT) is a medical imaging modality where a radiopharmaceutical's emissions are captured with one or more gamma cameras deployed about the patient. During tomographic acquisitions, the SPECT camera(s) collect gamma-ray projection images created by …
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Comparative assessment of several SPECT scatter correction methods using SimSPECT
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Biology, 1997.
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Inverted compound eye camera for second generation MRI compatible SPECT system
… design of the second-generation MRI compatible SPECT system, MRC-SPECT-II, based on an inverted compound eye (ICE) gamma camera concept inspired by compound eyes often found in small invertebrates. The MRC-SPECT II system is constructed with a total of 24 ICE-camera panels that consists of a …
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Simultaneous ⁹⁹m̳Tc-MDP/¹²³I-MIBG imaging of neuroblastoma using SPECT-CT
Simultaneous ⁹⁹m̳̳Tc-MDP/ ¹²³I-MIBG SPECT has the potential to replace current clinical sequential acquisitions of ⁹⁹m̳Tc-MDP and ¹²³-MIBG SPECT studies, and therefore has great potential to reduce imaging time, sedation time, and injection dose on patients with neuroblastoma. Simultaneous …
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Development of the MRC-SPECT-II system: a MR-compatible small-animal SPECT system based on semiconductor imaging spectrometers and a Synthetic Compound-Eye gamma camera design
Single photon emission computed tomography (SPECT) is a routine molecular imaging modality, widely appreciated in any nuclear medicine department and clinically used for more than 50 years. Whereas SPECT instrumentation used in clinical and preclinical practice is still mainly based on cumbersome …
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IMPROVING RESOLUTION IN WRIST SPECT WITH CONVERGING COLLIMATORS AND CT ANATOMICAL PRIORS
… to better specificity. We hypothesize that wrist SPECT resolution can be improved by using pinhole collimators and by incorporating anatomical prior information. Phantom experiments have shown that a 3mm single-pinhole system can achieve a 4mm resolution at clinical count levels, but a 3mm …
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