Results 211 to 220 of about 674,103 (264)
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Spatial uncertainty and spatial resolution
Annual Meeting Optical Society of America, 1988An observer’s ability to detect a threshold visual target depends on his knowledge of stimulus parameters, such as the target’s color, and its spatial and temporal locus. Withholding knowledge of the spatial locus of a visual acuity target should depress visual resolution because of the close theoretical relationship between spatial resolving power and
David J. Lasley, Theodore E. Cohn
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Physics in Medicine & Biology, 1979
The study of the dynamic behaviour of radiopharmaceuticals within a patient using a scintillation camera with data acquisition and processing facilities often presents analytical problems because of the limited data available. In the effort to maintain good spatial resolution sensitivity is often needlessly reduced producing further limitation in the ...
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The study of the dynamic behaviour of radiopharmaceuticals within a patient using a scintillation camera with data acquisition and processing facilities often presents analytical problems because of the limited data available. In the effort to maintain good spatial resolution sensitivity is often needlessly reduced producing further limitation in the ...
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Spatial Resolution in NMR Imaging
IEEE Transactions on Medical Imaging, 1984NMR imaging is used as an example of how spatial resolution can be improved in a signal-to-noise (S/N) limited situation. The NMR imaging process consists of two components-generating the NMR signal and localizing it in space. This paper will show that spatial resolution not only aids in identifying small structures, but improves the detectability of ...
L E, Crooks +5 more
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On the Spatial Resolution of GNSS Reflectometry
IEEE Geoscience and Remote Sensing Letters, 2016A method for defining the spatial resolution of a Global Navigation Satellite System reflectometry delay–Doppler map (DDM) and of any derived geophysical product is proposed. An effective spatial resolution is derived as a function of measurement geometry and delay–Doppler (DD) interval, and as a more appropriate representation of resolution than the ...
Maria Paola Clarizia, Christopher S. Ruf
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On the spatial resolution of clinical thermometers
Medical Physics, 1992In this work the spatial resolution of type T (copper‐Constantan) and type K (Chromel‐Alumel) multipoint thermocouple thermometers was investigated. For clinical use, thermocouples are usually inserted within catheters to provide easy access, reproducibility, and a sterile environment.
L H, Gerig, J, Szanto, G P, Raaphorst
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Spatial resolution in visual memory
Psychonomic Bulletin & Review, 2014Representations in visual short-term memory are considered to contain relatively elaborated information on object structure. Conversely, representations in earlier stages of the visual hierarchy are thought to be dominated by a sensory-based, feed-forward buildup of information.
Asaf, Ben-Shalom, Tzvi, Ganel
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Spatial Resolution in Digital Mammography
Investigative Radiology, 1993Digital acquisition systems currently available limit spatial resolution in digital mammography to roughly 0.1 mm/pixel. The objective of this study is to determine if high-quality mammography is possible at this resolution.The influence of spatial resolution on diagnostic quality was investigated by comparing observer performance on film to that on ...
N, Karssemeijer +2 more
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High-Spatial-Resolution Geochronology
Elements, 2013High-spatial-resolution isotope analyses have revolutionised U–(Th–)Pb geochronology. These analyses can be done at scales of a few tens of microns or less using secondary ion mass spectrometry or laser ablation inductively coupled plasma mass spectrometry.
Nemchin, Alexander A. +2 more
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The spatial resolution of scalp EEG
Neurocomputing, 2001Abstract The scalp electroencephalogram (EEG) exhibits spatiotemporal dynamics reflecting synchronous dendritic activity of cortical pyramidal neurons. Recent advances in EEG acquisition and electric head modeling are improving the spatial resolution of scalp EEG, but the skull remains an obstacle.
Thomas C. Ferrée +2 more
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Spatial and temporal resolution in FMRI
2001Abstract Most functional MRI studies to date have used relatively low resolution, both in space and time, to interrogate brain function. Typically, an in-plane resolution of 3-4 mm is used, in conjunction with slice thicknesses of 5-10 mm.
Ravi S. Menon, Bradley G. Goodyear
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