BACKGROUND Myocardial perfusion SPECT (MPS) traditionally requires the patient to be in the supine position, but diaphragmatic attenuation of the inferior wall reduces test specificity. The aim of this study was to assess the feasibility of combined MPS in the supine and prone positions using a novel cadmium zinc telluride (CZT) camera. METHODS AND RESULTS A total of 276 consecutive patients ...

A computational algorithm for numerically evaluating the z-transform of a sequence of N samples is discussed. This algorithm has been named the chirp z-transform (CZT) algorithm. Using the CZT algorithm one can efficiently evaluate the z-transform at M points in the z-plane which lie on circular or spiral contours beginning at any arbitrary point in the z-plane. The angular spacing of the point...

BACKGROUND For a 1-day myocardial perfusion SPECT (MPS) the recommendations for administered activity stated in the EANM guidelines results in an effective dose of up to 16 mSv per patient. Recently, a gamma camera system, based on cadmium zinc telluride (CZT) technology, was introduced. This technique has the potential to reduce the effective dose and scan time compared to the conventional NaI...

The development of a prototypc Compton scaltering camera based on two 1 cm3 cubic 3-D position scnsitivc CZT detectors is iindcrway in our laboratory. As a practical problem, the mechanical alignmcnt error may be larger than the 1 mm detector position rcsolution. This paper investigates thc cffccts of any possible mechanical alignmcnt error on the reconstructed images by Montc Carlo simulations...

The chemical mechanical polishing (CMP) technology has been widely used for surface modification of critical materials and components with high quality efficiency. In a typical CMP process, the properties abrasives play vital role in obtaining ultra-precision damage-free wafers improvement their performances. this work, series fine structured rod-shaped silica (RmSiO2)-based controllable sizes ...

Ground Penetrating Radar (GPR) application in road surface detection has been greatly developed the past few decades, which enables rapid and economical estimation of pavement thickness other physical properties non-destructive testing (NDT) non-contact (NCT). In recent years, with development microwave millimeter-wave solid-state devices digital signal processors, cost Frequency-Modulated Cont...