منابع مشابه
Evaluational Adjectives*
The literature on predicates of personal taste (PPTs) has focused on a surprisingly limited range of expressions. This narrow focus has led to problematic theoretical conclusions about the syntax and semantics. I argue that PPTs are an instance of a more interesting general category of (what I call) evaluational predicates. Like other gradable adjectives, PPTs are sensitive to a relevant degree...
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A new method of spatial compound imaging is presented that improves image quality without the usual requirement to decrease the frame rate. The new method of imaging utilizes three transducers for data acquisition. The transducer located at the center of the transducer system is a phased array probe that acts as both transmitter and receiver. The other transducers are unfocused pistons that act...
متن کاملSpatial compounding in 3D imaging of limbs.
Effects of spatial compounding on image resolution and speckle noise are studied. Using computer simulation, it is shown that spatial compounding using averaged reconstruction can significantly improve lateral resolution while slightly deteriorate axial resolution. The amount of net resolution improvement depends mainly on the compound angle, but is insensitive to the number of component images...
متن کاملSpatial Angular Compounding of Photoacoustic Images
Photoacoustic (PA) images utilize pulsed lasers and ultrasound transducers to visualize targets with higher optical absorption than the surrounding medium. However, they are susceptible to acoustic clutter and background noise artifacts that obfuscate biomedical structures of interest. We investigated three spatial-angular compounding methods to improve PA image quality for biomedical applicati...
متن کاملFreehand Spatial-Angular Compounding of Photoacoustic Images
Photoacoustic (PA) imaging is an emerging medical imaging modality that relies on the absorption of optical energy and the subsequent emission of acoustic waves that are detected with a conventional ultrasound probe. PA images are susceptible to background noise artifacts that reduce the signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR). We investigated spatial-angular compounding o...
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ژورنال
عنوان ژورنال: Ultrasonic Imaging
سال: 1994
ISSN: 0161-7346
DOI: 10.1006/uimg.1994.1011