Single Photon Detector
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. A clinical gamma camera-based pinhole collimated system for high resolution small animal SPECT imaging
The main objective of the present study was to upgrade a clinical gamma camera to obtain high resolution tomographic images of small animal organs. The system is based on a clinical gamma camera to which we have adapted a special-purpose pinhole collimator and a device for positioning and rotating the target based on a computer-controlled step motor. We deve
Brazilian Journal of Medical and Biological Research. Publicado em: 2010-12
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2. Tin and zinc oxides semiconductor devices / Dispositivos semicondutores a partir de óxidos de estanho e zinco
This work presents the study and development of semiconductor devices base on tin and zinc oxides. The first device is related to the development of pH sensors based on field effect, while the second device uses surface acoustic waves for the transport of carriers related to a single photon detector device. Initially, the semiconductors were used as hydrogen
Publicado em: 2009
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3. Considerations about the influence of upper arms positioning on myocardial perfusion scintigraphy results / Considerações referentes à influência do posicionamento dos membros superiores sobre o resultado da cintilografia de perfusão do miocárdio
Contrary to the advances in imaging technology for nuclear cardiology applications, we keep using the same often uncomfortable and sometimes impracticable patient position- supine with arms raised above the head (C). We tested another position modality: supine with arms down at the sides of the trunk (T). The purpose of this study was to verify if the functi
Publicado em: 2008
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4. Teoria e implementaÃÃo de detectores de fÃtons isolados para comunicaÃÃes quÃnticas em redes Ãpticas / Theory and implementation of sigle-photon detectors for quantum communications in optical networks
Tecnologia da InformaÃÃo QuÃntica à uma Ãrea multidisciplinar nova que tem recebido muita atenÃÃo por ser promissora e devido a seu alto potencial em resolver problemas ainda nÃo solucionados. Dentro desta grande Ãrea, as ComunicaÃÃes QuÃnticas estÃo bastante desenvolvidas. Nesta sub-Ãrea, distribuiÃÃo QuÃntica de Chaves à o campo mais avan
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/06/2006
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5. Liquid scintillator for 2D dosimetry for high-energy photon beams
Complex radiation therapy techniques require dosimetric verification of treatment planning and delivery. The authors investigated a liquid scintillator (LS) system for application for real-time high-energy photon beam dosimetry. The system was comprised of a transparent acrylic tank filled with liquid scintillating material, an opaque outer tank, and a CCD c
American Association of Physicists in Medicine.
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6. Fly motion vision is based on Reichardt detectors regardless of the signal-to-noise ratio
The computational structure of an optimal motion detector was proposed to depend on the signal-to-noise ratio (SNR) of the stimulus: At low SNR, the optimal motion detector should be a correlation or “Reichardt” type, whereas at high SNR, the detector would employ a gradient scheme [Potters, M. & Bialek, W. (1994) J. Physiol. (Paris) 4, 1755-1775]. Altho
National Academy of Sciences.
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7. A multiple-capillary electrophoresis system for small-scale DNA sequencing and analysis.
A five-capillary system has been developed for DNA sequencing and analysis. The post-column fluorescence detector is based on a sheath-flow cuvette. The instrument provides uniform and continuous illumination of the samples. The cuvette virtually eliminates cross-talk in the fluorescence signal between capillaries. Discrete single-photon counting avalanche p
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8. Dendritic Calcium Channels and Their Activation by Synaptic Signals in Auditory Coincidence Detector Neurons
The avian nucleus laminaris (NL) encodes the azimuthal location of low-frequency sound sources by detecting the coincidence of binaural signals. Accurate coincidence detection requires precise developmental regulation of the lengths of the fine, bitufted dendrites that characterize neurons in NL. Such regulation has been suggested to be driven by local, syna
American Physiological Society.
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9. On-board SPECT for localizing functional targets: A simulation study
Single photon emission computed tomography (SPECT) was investigated for imaging on-board radiation therapy machines in order to localize functional and molecular targets. A computer-simulated female NCAT phantom was positioned supine on a flat-top treatment couch. Twenty tumor locations were defined in the upper torso. The eight lung tumors were subject to t
American Association of Physicists in Medicine.