OBJECTIVES Although transgenic mice have emerged as powerful experimental models of cardiovascular disease, methods for in vivo phenotypic assessment and characterization remain limited, motivating the development of new instruments for biologic measurement. BACKGROUND We have developed a single-photon emission computed tomography system with a pinhole collimator (pinhole SPECT) for high-reso...

Abstract High-resolution optical imaging through or within thick scattering media is a long sought after yet unreached goal. In the past decade, thriving technique developments in wavefront measurement and manipulation do not significantly push boundary forward. The diffusion limit still ceiling. this work, we propose that medium can be conceptualized as an assembly of randomly packed pinhole c...

In this study, we measured the interfacial shear strength between a thermoplastic resin and carbon fiber by novel pinhole-type pull-out method. method, specimen had pinhole formed on thin metal plate filled with resin. A was embedded into pulled out from pinhole. Seven types of polymers were used as resin, including PP, Modified PA6, PA12, PC, PMMA PEEK. shape is determined geometry always cyli...

Uniformly redundant arrays (URA) have autocorrelation functions with perfectly flat sidelobes. The URA combines the high-transmission characteristics of the random array with the flat sidelobe advantage of the nonredundant pinhole arrays. A general expression for the signal-to-noise ratio (SNR) has been developed for the URA as a function of the type of object being imaged and the design parame...

We show that it is possible to find and characterise optical vortices in a speckle pattern using a multi-pinhole interferometer. This measurement does not require an interferometric setup, providing great experimental ease. In addition, a multi-pinhole interferometer can be made arbitrarily large and can therefore be adjusted to the expected speckle size. We present experimental results confirm...