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Combined near-infrared spectroscopy and multifrequency bio-impedance investigation of skin alterations in diabetes patients based on multivariate analyses
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Kemiska institutionen.
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Kemiska institutionen.
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Kemiska institutionen.
Vise andre og tillknytning
2003 (engelsk)Inngår i: Medical and Biological Engineering and Computing, ISSN 0140-0118, E-ISSN 1741-0444, Vol. 41, nr 3, s. 324-329Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

A group of 34 diabetic men, with different degrees of diabetes complications, including skin changes, were studied by near-infrared (NIR) spectroscopy and total body multi-frequency bio-impedance analyses (MFBIA-body). Skin reflectance spectra were measured with a fibre-optic probe in four locations (sites): hand, arm, leg and foot. As control subjects, a group of 23 healthy males were also measured. A combined multivariate analysis of the two types of spectrum was performed. It was concluded that the NIR method has the potential to detect diabetes-related skin conditions and also that the combination of the two techniques provides a higher potential for classification and discrimination of the skin conditions, with correct classification increasing from 63% to 85%.

sted, utgiver, år, opplag, sider
Springer, 2003. Vol. 41, nr 3, s. 324-329
Emneord [en]
NIR, Total body bio-impedance, Fibre-optic probe, PCA, Skin changes, Diabetes
HSV kategori
Identifikatorer
URN: urn:nbn:se:umu:diva-9916DOI: 10.1007/BF02348438OAI: oai:DiVA.org:umu-9916DiVA, id: diva2:149587
Tilgjengelig fra: 2008-05-22 Laget: 2008-05-22 Sist oppdatert: 2018-06-09bibliografisk kontrollert
Inngår i avhandling
1. Multivariate non-invasive measurements of skin disorders
Åpne denne publikasjonen i ny fane eller vindu >>Multivariate non-invasive measurements of skin disorders
2006 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

The present thesis proposes new methods for obtaining objective and accurate diagnoses in modern healthcare. Non-invasive techniques have been used to examine or diagnose three different medical conditions, namely neuropathy among diabetics, radiotherapy induced erythema (skin redness) among breast cancer patients and diagnoses of cutaneous malignant melanoma. The techniques used were Near-InfraRed spectroscopy (NIR), Multi Frequency Bio Impedance Analysis of whole body (MFBIA-body), Laser Doppler Imaging (LDI) and Digital Colour Photography (DCP).

The neuropathy for diabetics was studied in papers I and II. The first study was performed on diabetics and control subjects of both genders. A separation was seen between males and females and therefore the data had to be divided in order to obtain good models. NIR spectroscopy was shown to be a viable technique for measuring neuropathy once the division according to gender was made. The second study on diabetics, where MFBIA-body was added to the analysis, was performed on males exclusively. Principal component analysis showed that healthy reference subjects tend to separate from diabetics. Also, diabetics with severe neuropathy separate from persons less affected.

The preliminary study presented in paper III was performed on breast cancer patients in order to investigate if NIR, LDI and DCP were able to detect radiotherapy induced erythema. The promising results in the preliminary study motivated a new and larger study. This study, presented in papers IV and V, intended to investigate the measurement techniques further but also to examine the effect that two different skin lotions, Essex and Aloe vera have on the development of erythema. The Wilcoxon signed rank sum test showed that DCP and NIR could detect erythema, which is developed during one week of radiation treatment. LDI was able to detect erythema developed during two weeks of treatment. None of the techniques could detect any differences between the two lotions regarding the development of erythema.

The use of NIR to diagnose cutaneous malignant melanoma is presented as unpublished results in this thesis. This study gave promising but inconclusive results. NIR could be of interest for future development of instrumentation for diagnosis of skin cancer.

sted, utgiver, år, opplag, sider
Umeå: Kemi, 2006. s. 46
Emneord
Multivariate Data Analysis, Non-invasive techniques, Clinical studies, Principal Component Analysis, Partial Least Squares Discriminant Analysis, Wilcoxon Signed Rank Sum Test, Near-InfraRed spectroscopy, Frequency Bio Impedance Analysis of whole body, Laser Doppler Imaging, Digital Colour Photography
HSV kategori
Identifikatorer
urn:nbn:se:umu:diva-865 (URN)91-7264-154-1 (ISBN)
Disputas
2006-10-06, KB3A9, KBC-huset, Umeå, 10:30
Opponent
Veileder
Tilgjengelig fra: 2006-09-14 Laget: 2006-09-14 Sist oppdatert: 2018-06-09bibliografisk kontrollert

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