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Technique for improving the spatial resolution of radiological images

IP.com Disclosure Number: IPCOM000031203D
Publication Date: 2004-Sep-17
Document File: 2 page(s) / 308K

Publishing Venue

The IP.com Prior Art Database

Abstract

ID203060

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Technique for improving the spatial resolution of radiological images

Abstract

The process of image acquisition with flat panel detectors can be seen in its signal flow aspects as a combination of adding signal-depending Poisson noise to the true underlying signal, low-pass filtering of the signal with the modulation transfer function of the detector, adding of electronic noise and subsequent sampling and quantisation of the signal.

The state of the art is to locally adaptive filter the signal with anisotropic diffusion approaches, containing both high-pass filtering in direction of the local gradients and low-pass filtering orthogonal to the gradient direction. The disclosure describes a novel technique of choosing the filter of the high- pass coefficients. For calculating the high-pass filter, the inverse of the modulation transfer function is used as a target function. This inverse filter is weighted by the estimated signal-to-noise characteristic in Wiener filtering fashion. Subsequently, the state-of-the-art weighting according to the local frequency response is performed. The algorithm is compatible to multi-resolution processing schemes and can therefore be combined with existing implementations. Best performance is achieved when detector-individual MTF functions are used.

Application area

X-ray imaging

State-of-the-art, current technique

The state of the art is to locally adaptive filter the signal with anisotropic diffusion approaches, containing both high-pass filtering in direction of the local gradients and low-pass filtering orthogonal to the gradient direction.

Solved problem

The existing approaches do not take into accou...