A resolution and viewing-angle enhanced integral imaging system using electrically movable pinhole array is proposed. A pinhole array on liquid crystal is adopted as dynamic pinhole array in integral imaging. The location of the pinhole array is controlled electrically. The pinhole array is expected to be moved fast enough to make an after-image effect, and the corresponding elemental images ar...

The focusing capabilities of a pinhole zone plate lens are presented and compared with those of a conventional Fresnel zone plate lens. The focusing properties are examined both experimentally and numerically. The results confirm that a pinhole zone plate lens can be an alternative to a Fresnel lens. A smooth filtering effect is created in pinhole zone plate lenses, giving rise to a reduction o...

Objectives This retrospective study evaluated whether the use of additional anterior 99mTc-sestamibi/123I pinhole imaging improves the outcome of 99mTc-sestamibi/123I subtraction SPECT/CT in parathyroid scintigraphy (PS). Materials and Methods PS using simultaneous dual-isotope subtraction methods and an acquisition protocol combining SPECT/CT and planar pinhole imaging was performed for 175 ...

Earth-dam failure starts with cracking in the clay core, and this is not easy to detect prevent. Therefore, swellable a feasible solution, which helps close cracks automatically based on self-healing process. The presented study utilizes experimental procedures analyze swelling behavior of fine-grained clayey soils prevent structural regarding crack generations. In regard, materials were modifi...

The imaging of distributed sources with near-field coded aperture (CA) remains extremely challenging and is broadly considered unsuitable for single-photon emission computerized tomography (SPECT). This study proposes a novel CA SPECT reconstruction approach and evaluates the feasibilities of imaging and reconstructing distributed hot sources and cold lesions using near-field CA collimation and...

Optical transfer functions are presented for the 4pi’ microscope. The effects of the size of the confocal pinhole on the threedimensional resolution are studied. It is shown that the resolution of the 4Pi’ microscope depends weakly on the pinhole size. This result suggest that the pinhole can be removed in order to increase the signal-to-noise ratio. PACS: 42.30.Lr; 42.30.-d; 87.64.Rr

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...

BACKGROUND Vision screening study in primary school children has not been done in Bayelsa State, South-South Nigeria. This study was therefore conducted to screen primary school children for refractive error in Bayelsa State and use the data to plan for an effective school Eye Health Program. METHODS A cross sectional study on screening for refractive error in school children was carried out ...

The pinhole collimator is currently the collimator of choice in small animal single photon emission computed tomography (SPECT) imaging because it can provide high spatial resolution and reasonable sensitivity when the animal is placed very close to the pinhole. It is well known that if the collimator rotates around the object (e.g., a small animal) in a circular orbit to form a cone-beam imagi...