2ir@tmax Ji(2@rr@max) Page 1 Visual recognition of the Structure of an object is impaired by
noise that is spectrally adjacent to the frequencies of interest. High-frequency noise, intro …

METHOD Figure 1shows the approach used in this experiment. At 1the image to be
processed is acquired as two half-count images; for example, an image of 100,000 counts …

Objectives Both qualitative and quantitative analysis in nuclear medicine can be
undermined by Poisson noise in low-count clinical images. Whilst the conventional …

Preliminary image quality measurements have been performed on a digital photoelectronic
imaging system assembled in our laboratory. The system consists of a Gd2O2S: Tb …

SUMMARY A new method for the enhancement of smoothing filters has been developed. It
is an iterative and non-stationary (INS) process by which averaging is limited only to pixels …

The formulation of an" optimal" filter for improving the quality of digitally recorded nuclear
medicine images is reported in this paper. The method forms a Metz filter for each image …

MATERIALS AND METHODS Basic theory. The theory and application of digital filters in
nuclear medicine are describedin detail elsewhere (3, 4). Briefly, filtering can be performed …

To improve the quality of digital nuclear medicine images, we have developed a new
implementation of the Wiener restoration filter. The Wiener filter uses as its optimality …

The data corresponding to any single digital radio nuclide image can be described by a two-
dimensional matrix of random variables b:@, each representing the observed density of …

[en] Using a commercially available DSA system (CGR DG300), the authors measured the
standard deviation of the image pixel values over a wide range of radiologic conditions …