UNLABELLED This study was undertaken to determine the effects of collimators on the accuracy of preoperative sestamibi parathyroid imaging of the neck. METHODS Forty-nine patients with primary hyperparathyroidism underwent preoperative (99m)Tc-sestamibi parathyroid imaging. The protocol included early and late pinhole and parallel-hole imaging. One experienced nuclear physician, without knowl...

The world’s first photograph was taken by Joseph Nicphore Niépce (1775–1833) in 1826 on his country estate near Chalon-sur-Sane, France. The photo shows parts of farm buildings and some sky. Exposure time was eight hours. Niépce used a pinhole camera, known as camera obscura, and utilized pewter plates as the support medium for the photographic process. The camera obscura, the basic projection ...

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...

UNLABELLED (99m)Tc-sestamibi dual-phase scintigraphy is currently established for parathyroid localization. However, the imaging technique is not standardized, and the role of the pinhole collimator, especially, is not fully recognized in the imaging protocol. The aim of this study was to check whether the use of a pinhole collimator in parathyroid scintigraphy would enhance lesion detectabilit...

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

Received 3/30/2009; revised 4/13/2009; accepted 4/21/2009. For correspondence and reprints contact: Chi-Yun Chen, M.D., Department of Nuclear Medicine, Antai Tian-Sheng Memorial Hospital. 210 Section 1, ChungCheng Road, Tungkang, Pingtung 92842, Taiwan. Tel: (886)8-8329966 ext. 1631, Fax: (886)8-8329977, E-mail: [email protected] Objective: The purpose of this study was to compare the image...

Abstract Measuring x-ray beam position, profile, and intensity at synchrotron beamlines provides valuable information for all experiments. Sydor’s transparent camera (TXC), based on technology originally developed Brookhaven National Laboratory[1], enables these measurements in-line with experiments live feedback. The TXC has a low profile that fits within standard vacuum flange width is compos...

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...

Multiple-pinhole (MPH) glasses are currently sold in many countries with unproven advertisements; however, their objective and subjective effects have not been investigated. Therefore, to investigate the effects of MPH glasses excluding the single-pinhole (SPH) effect, we compared the visual functional changes, reading speed, and ocular discomfort after reading caused by MPH and SPH glasses. He...