𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Enhancement of abnormality in gamma images using Kohonen filters

✍ Scribed by Esko Riihimäki; Lars-Erik Häll; Pentti Eistola; Esko Tähti; Tapani Korppi-Tommola


Publisher
Springer
Year
1976
Tongue
English
Weight
357 KB
Volume
1
Category
Article
ISSN
0340-6997

No coin nor oath required. For personal study only.

✦ Synopsis


A new method of processing digital images consists of a numerical filter which suppresses normal features producing an enhancement of the abnormality. The resulting filtered image aids the observer in the recognition of the abnormality. The filter is developed from verified normal images in the computer memory. The enhancement of pathologic accumulations with respect to surrounding activity was improved on the average by a factor of 2.6 for 13 lateral brain images.


📜 SIMILAR VOLUMES


The use of band-selectable digital filte
✍ D. K. Mitchell; S. T. Nichols; M. R. Smith; K. Scott 📂 Article 📅 1989 🏛 John Wiley and Sons 🌐 English ⚖ 869 KB

Manipulation of the data describing two-dimensional magnetic resonance (MR) images can be used to zoom an image, decrease image noise and artifacts by modeling, or emphasize object edges in the field of view. In this paper, a two-dimensional band-selectable digital filtering (2D-BSDF) technique is d

CNR enhancement in the presence of multi
✍ D. G. Brown; J. N. Lee; R. A. Blinder; H. Z. Wang; S. J. Riederer; L. W. Nolte 📂 Article 📅 1990 🏛 John Wiley and Sons 🌐 English ⚖ 999 KB

## Abstract Given several images of the same slice, a linear filter can produce an image in which the contrast‐to‐noise ratio (CNR) between pathological and normal tissues is greater than in any of the initial images. To distinguish the pathology from more than one tissue, the filter should optimiz

Venous signal suppression in 3D dynamic
✍ Dave W. Kaandorp; Klaas Kopinga; Pieter F.F. Wijn 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 392 KB

A three-dimensional dynamic gadolinium-enhanced carotid artery imaging protocol with 10 sec per phase was evaluated with respect to the acquisition of an arterial-only phase after contrast bolus injection. Subsequently, the eigenimage filter was used to suppress any venous signal based on a differen

Abnormalities of the contrast re-circula
✍ A. Kassner; D.J. Annesley; X.P. Zhu; K.L. Li; I.D. Kamaly-Asl; Y. Watson; A. Jac 📂 Article 📅 2000 🏛 John Wiley and Sons 🌐 English ⚖ 332 KB 👁 1 views

Dynamic susceptibility contrast-enhanced magnetic resonance (MR) imaging in tumors is restricted by relaxivity effects, which may obscure any abnormality of first-pass kinetics in the re-circulation phase. The purposes of this study were a) to document the magnitude of relaxivity effects with a vari

The use of wiener deconvolution (an opti
✍ John H. Letcher 📂 Article 📅 1989 🏛 John Wiley and Sons 🌐 English ⚖ 396 KB

A computer software technique has been developed and employed to insert a modified-Wiener-deconvolution filter (an optimal filter) immediately following the quadrature detector of a magnetic resonance imager. The purpose of this effort is to try to suppress the undesirable effect of the noise found