The Wavelet Digest Homepage
Return to the homepage
Search the complete Wavelet Digest database
Help about the Wavelet Digest mailing list
About the Wavelet Digest
The Digest The Community
 Latest Issue  Back Issues  Events  Gallery
The Wavelet Digest
   -> Volume 5, Issue 8


Thesis: Pattern Recognition of in vivo MR spectra
 
images/spacer.gifimages/spacer.gif Reply into Digest
Previous :: Next  
Author Message
rosemary@cogs.susx.ac.uk (Anne Rosemary Tate)
Guest





PostPosted: Thu Sep 19, 1996 9:17 am    
Subject: Thesis: Pattern Recognition of in vivo MR spectra
Reply with quote

#7 Thesis: Pattern Recognition of in vivo MR spectra

My DPhil thesis, entitled:

"Pattern Recognition Analysis of in vivo Magnetic Resonance Spectra"

which describes an application of the use of wavelets for feature
extraction, is now available in postscript format as a technical
report (csrp432) from the School of Cognitive and Computing Sciences,
University of Sussex.

It can be obtained by anonymous ftp to

ftp://ftp.cogs.susx.ac.uk/pub/reports/csrp/csrp432.ps.Z

or alternatively from

http://www.cogs.susx.ac.uk/

Abstract:

Magnetic resonance spectroscopy (MRS) provides a unique non-invasive
method for obtaining information on the biochemistry of living tissue
in situ, and therefore has great potential as a clinical
tool. However, presently in vivo MRS is used mainly for research,
rather than for clinical applications.

There are a number of reasons for this. The information may be
difficult to extract from the spectrum due to low signal-to-noise
ratio and other problems associated with obtaining a signal from
living tissue. Interpretation may be difficult due to the large number
of metabolites represented by the spectra. Another problem is that
most current methods for analysing MRS data are targeted at providing
information on specific metabolites, rather than the more general
information appropriate for clinical applications, such as the disease
stage or state of the tissue being examined.

This thesis shows how pattern recognition techniques may be used to
help overcome these problems and to provide methods for classifying in
vivo spectra according to their tissue type. A prototype system for
classifying spectra is developed using features that are extracted
automatically, using the whole spectrum, rather than selected
peaks. These features were selected purely on the basis of their power
to discriminate between different types of spectra, using no prior
knowledge of biochemistry. Among the techniques used were wavelets,
principal component analysis and linear discriminant function
analysips. These techniques were tested on two sets of in vivo data:
75 carbon spectra obtained from healthy human volunteers from three
different dietary groups of adipose tissue in the leg and 55 phos
spectra obtained from tumorous and normal tissue in rats. For both
datasets most of the spectra were assigned to their correct groups
(94% of the carbon and 86 - 100% of the phos spectra) without the need
for explicit identification or measurement of peaks.

Rosemary Tate.
All times are GMT + 1 Hour
Page 1 of 1

 
Jump to: 
 


disclaimer - webmaster@wavelet.org
Powered by phpBB

This page was created in 0.024795 seconds : 18 queries executed : GZIP compression disabled