Background: In myocardial perfusion SPECT imaging, images are degraded by photon attenuation, the distance-dependent collimator, detector response and photons scatter. Filters greatly affect quality of nuclear medicine images Materials and Methods: A phantom simulating heart left ventricle was built. About 1mCi of 99mTc was injected into the phantom. Images were taken from this phantom. Some fi...

Abstract-Electrocardiogram (ECG) signal has been broadly used in cardiac pathology to find heart disease. ECG signal is commonly corrupted by disparate artifacts as baseline wander, power line interference (50/60 Hz) and electromyography noise and these should be eliminated before diagnosis. The function proposed in this paper is removal of low frequency interference i.e. baseline wandering and...

An anti-aliasing filter that incorporates a sampler is proposed to precede noise-shaping analog-to-digital converters (ADCs), such as discrete-time ΔΣ modulators. The architecture of the proposed anti-aliasing filter is inspired by the implicit antialiasing filtering property of CT ΔΣ modulators. However, contrary to CT ΔΣ modulators, the proposed anti-aliasing filter is not sensitive to clock ...

-The electrocardiogram has considerable diagnostic significance, and application of ECG monitoring are diverse and in wide use. For diagnosticquality ECG recordings, signal acquisition must be noise free. The signal acquisition is susceptible to the interference from other biological and environmental sources. This article presents the application of the digital IIR filter on the raw ECG signal...

Explicit solutions are given for the rational function P (z) for two classes of IIR orthogonal two-band wavelet bases, for which the scaling filter is maximally flat. P (z) denotes the rational transfer function H(z)H(1=z), where H(z) is the (lowpass) scaling filter. The first is the class of solutions that are intermediate between the Daubechies and the Butterworth wavelets. It is found that t...

A properly designed Class-D output filter limits supply current, minimizes EMI and protects the loudspeaker from switching waveforms. However, it also significantly increases the total design cost. The current recommended second-order output filter for the TI TPA005D02 is 30% of the audio power amplifier (APA) solution cost. This application note details the second-order Butterworth filter and ...