This paper introduces a directionally oriented 2-D filter bank with the property that the individual channels may be critically sampled without loss of information. The passband regions of the component filters are wedge shaped and thus provide directional information. It is shown that these filter bank outputs may be maximally decimated to achieve a minimum sample representation in a way that ...

ABSTRACT One of the critical challenges facing imaging studies 21-cm signal at Epoch Reionization (EoR) is separation astrophysical foreground contamination. These foregrounds are known to lie in a wedge-shaped region (k?, k?) Fourier space. Removing these modes excises grave expense image fidelity, since cosmological information also removed by wedge filter. However, EoR non-Gaussian, meaning ...

Analytical and numerical Gaussian models have been used in recent decades for radiotherapy treatment planning software/calculations, to perform accurately radiation dose delivery –numerical, analytical, or numerical-analytical. The objective of this contribution was to obtain an exact dose delivery, 3D analytical-integral-equation solution, for the triple Gaussian model of wedge filters, since ...

AIM OF THE STUDY Accurate skin dose assessment is necessary during breast radiotherapy to assure that the skin dose is below the tolerance level and is sufficient to prevent tumour recurrence. The aim of the current study is to measure the skin dose and to evaluate the geometrical/anatomical parameters that affect it. MATERIAL AND METHODS Forty patients were simulated by TIGRT treatment plann...