background: butterworth, gaussian, hamming, hanning, and parzen are commonly used spect filters during filtered back-projection (fbp) reconstruction, which greatly affect the quality and size accuracy of image. materials and methods: this study involved a cardiac phantom in which 1.10 cm thick cold defect was inserted into its myocardium wall and filled with 4.0 μci/ml (0.148 mbq/ml) 99mtc conc...

Background: Butterworth, Gaussian, Hamming, Hanning, and Parzen are commonly used SPECT filters during filtered back-projection (FBP) reconstruction, which greatly affect the quality and size accuracy of image. Materials and Methods: This study involved a cardiac phantom in which 1.10 cm thick cold defect was inserted into its myocardium wall and filled with 4.0 μCi/ml (0.148 MBq/ml) 99mTc conc...

S U M M A R Y We explore a practical approach to earthquake early warning in southern California by determining a ground-motion period parameter τc and a high-pass filtered displacement amplitude parameter Pd from the initial 3 s of the P waveforms recorded at the Southern California Seismic Network stations for earthquakes with M > 4.0. At a given site, we estimate the magnitude of an event fr...

Abstracts-This paper presents the design of a compact Butterworth low pass filter designed operating at frequency range of 300-400MHz with input and output impedance of 50 ohm have been designed, simulated and fabricated. This filter is used to attenuate harmonic that generated by power amplifier to prevent from radiating out through the antenna. The filter’s circuits were first simulated using...

The purpose of this study was to capture the lower limb kinematics before during and after ball impact of soccer kicking by examining the influence of both sampling rate and smoothing procedures. Nine male soccer players performed maximal instep kicks and the three-dimensional leg movements were captured at 1000 Hz. Angular and linear velocities and accelerations were determined using four diff...

This paper presents improved autoregressive modelling (AR) to reduce noise in SPECT images. An AR filter was applied to prefilter projection images and postfilter ordered subset expectation maximisation (OSEM) reconstruction images (AR-OSEM-AR method). The performance of this method was compared with filtered back projection (FBP) preceded by Butterworth filtering (BW-FBP method) and the OSEM r...

AND NECK.-By Dr. M. Kirschner with the collaboration of A. Lautenschlager and Dr. O. Kleinschmidt. Authorized translation by I. S. Davdin, B.S., M.D., and G. M. Coates, A.B., M.D. Volume III. 1937. J. B. Lippincott Company, Philadelphia and London. Pp. xii plus 528, with 460 illustrations, mostly coloured. Price, 50s. Obtainable from Messrs. Butterworth and Company (India), Limited, Calcutta. P...

In this paper, a new two-steps design strategy is introduced for the optimal rational approximation of fractional-order Butterworth filter. At first, weighting factors summation between n th -order and (n + 1) filters are optimally determined. Subsequently, model employed as an initial point ano...

Attwood, Tony, 2002. Dyscalculia in Schools: What It Is and What You Can Do. First and Best in Education Ltd. ISBN 1-86083-614-3; Butterworth,Brian, 2004. Dyscalculia Guidance: Helping Pupils With Specific Learning Difficulties in Maths. David Fulton Publications. ISBN 0-7087-1152-9 Geary DC, Bailey DH, Littlefield A, Wood P, Hoard MK, Nugent L. (2009). "First-Grade Predictors of Mathemati...

In this paper, we propose efficient numerical techniques for Butterworth filtering and implicit fairing of large irregular triangle meshes, where the corresponding filters are rational polynomials and the resulting large linear systems need to be solved iteratively. We show that significant speed-up can be achieved for Butterworth filtering by factorizing the linear system in the complex domain...