Physical aspects of roentgen therapy using wedge filters

Steerable Wedge Filters

Steerable lters, as developed by Freeman and Adelson, are a class of rotation-invariant linear operators that may be used to analyze local orientation patterns in imagery. The most common examples of such operators are directional derivatives of Gaussians and their 2-D Hilbert transforms. The inherent symmetry of these lters produces an orientation response that is periodic with period , even w...

Optimum reckoning of contra lateral breast dose using physical wedge and enhanced dynamic wedge in radiotherapy treatment planning system

Background: It was intended to investigate the effect of physical wedge (PW) and enhanced dynamic wedges (EDW) on contralateral breast dose during primary breast irradiation in radiotherapy treatment, using high energy photon beams. Materials and Methods: The Varian’s Clinac dual mode linear accelerator model 2100 C/D and Siemen’s Primus accelerators were used for radiation doses wi...

Theoretical Principles of Roentgen Therapy

This volume on. the theoretical principles of roentgen therapy, which is going to be followed by a second on the more clinical aspects of radiation therapy, bears the stamp of authority. Each section is written by an acknowledged leader in the particular field covered, the contributors being:?R. R. Newell, m.d., Professor of Medicine (Radiology), in the Stanford University Medical School, San F...

Radium Therapy: Its Physical Aspects

Minutiae Verification in Fingerprint Images Using Steerable Wedge Filters

A majority of the existing fingerprint recognition systems are based on matching minutia features. Therefore minutiae extraction forms a very critical step and greatly influences the overall accuracy of the matching system. Poor ridge structure and processing artifacts result in missing and spurious minutia that can degrade the matching performance. We propose a novel approach based on Steerabl...