Combining various types of classifiers and features extracted
from magnetic resonance imaging data in schizophrenia
recognition

J 2015

Combining various types of classifiers and features extracted from magnetic resonance imaging data in schizophrenia recognition

JANOUŠOVÁ, Eva; Daniel SCHWARZ and Tomáš KAŠPÁREK

Basic information

Original name

Combining various types of classifiers and features extracted from magnetic resonance imaging data in schizophrenia recognition

Authors

JANOUŠOVÁ, Eva; Daniel SCHWARZ and Tomáš KAŠPÁREK

Edition

Psychiatry Research: Neuroimaging, CLARE, ELSEVIER IRELAND LTD, 2015, 0925-4927

Other information

Language

English

Type of outcome

Article in a journal

Field of Study

30000 3. Medical and Health Sciences

Country of publisher

Ireland

Confidentiality degree

is not subject to a state or trade secret

Impact factor

Impact factor: 2.477

RIV identification code

RIV/00216224:14110/15:00087443

Organization unit

Faculty of Medicine

DOI

https://doi.org/10.1016/j.pscychresns.2015.03.004

UT WoS

000354552900006

EID Scopus

2-s2.0-84929505685

Keywords in English

Computational neuroanatomy; Classification; Intersubject principal component analysis (isPCA); Modified maximum uncertainty linear; discriminant analysis (mMLDA); Centroid method; Average linkage

Abstract

In the original language

We investigated a combination of three classification algorithms, namely the modified maximum uncertainty linear discriminant analysis (mMLDA), the centroid method, and the average linkage, with three types of features extracted from three-dimensional T1-weighted magnetic resonance (MR) brain images, specifically MR intensities, grey matter densities, and local deformations for distinguishing 49 first episode schizophrenia male patients from 49 healthy male subjects. The feature sets were reduced using intersubject principal component analysis before classification. By combining the classifiers, we were able to obtain slightly improved results when compared with single classifiers. The best classification performance (81.6% accuracy, 75.5% sensitivity, and 87.8% specificity) was significantly better than classification by chance. We also showed that classifiers based on features calculated using more computation-intensive image preprocessing perform better; mMLDA with classification boundary calculated as weighted mean discriminative scores of the groups had improved sensitivity but similar accuracy compared to the original MLDA; reducing a number of eigenvectors during data reduction did not always lead to higher classification accuracy, since noise as well as the signal important for classification were removed. Our findings provide important information for schizophrenia research and may improve accuracy of computer aided diagnostics of neuropsychiatric diseases.

Links

NT13359, research and development project

Name: Pokročilé metody rozpoznávání MR obrazů mozku pro podporu diagnostiky neuropsychiatrických poruch

Investor: Ministry of Health of the CR

Cite

JANOUŠOVÁ, Eva; Daniel SCHWARZ and Tomáš KAŠPÁREK. Combining various types of classifiers and features extracted from magnetic resonance imaging data in schizophrenia recognition. Psychiatry Research: Neuroimaging. CLARE: ELSEVIER IRELAND LTD, 2015, vol. 232, No 3, p. 237-249. ISSN 0925-4927. Available from: https://doi.org/10.1016/j.pscychresns.2015.03.004.

@article{1305888,
   author = {Janoušová, Eva and Schwarz, Daniel and Kašpárek, Tomáš},
   article_location = {CLARE},
   article_number = {3},
   doi = {https://doi.org/10.1016/j.pscychresns.2015.03.004},
   keywords = {Computational neuroanatomy; Classification; Intersubject principal component analysis (isPCA); Modified maximum uncertainty linear; discriminant analysis (mMLDA); Centroid method; Average linkage},
   language = {eng},
   issn = {0925-4927},
   journal = {Psychiatry Research: Neuroimaging},
   title = {Combining various types of classifiers and features extracted from magnetic resonance imaging data in schizophrenia recognition},
   volume = {232},
   year = {2015}
}

TY  - JOUR
ID  - 1305888
AU  - Janoušová, Eva - Schwarz, Daniel - Kašpárek, Tomáš
PY  - 2015
TI  - Combining various types of classifiers and features extracted from magnetic resonance imaging data in schizophrenia recognition
JF  - Psychiatry Research: Neuroimaging
VL  - 232
IS  - 3
SP  - 237-249
EP  - 237-249
PB  - ELSEVIER IRELAND LTD
SN  - 09254927
KW  - Computational neuroanatomy
KW  - Classification
KW  - Intersubject principal component analysis (isPCA)
KW  - Modified maximum uncertainty linear
KW  - discriminant analysis (mMLDA)
KW  - Centroid method
KW  - Average linkage
N2  - We investigated a combination of three classification algorithms, namely the modified maximum uncertainty linear discriminant analysis (mMLDA), the centroid method, and the average linkage, with three types of features extracted from three-dimensional T1-weighted magnetic resonance (MR) brain images, specifically MR intensities, grey matter densities, and local deformations for distinguishing 49 first episode schizophrenia male patients from 49 healthy male subjects. The feature sets were reduced using intersubject principal component analysis before classification. By combining the classifiers, we were able to obtain slightly improved results when compared with single classifiers. The best classification performance (81.6% accuracy, 75.5% sensitivity, and 87.8% specificity) was significantly better than classification by chance. We also showed that classifiers based on features calculated using more computation-intensive image preprocessing perform better; mMLDA with classification boundary calculated as weighted mean discriminative scores of the groups had improved sensitivity but similar accuracy compared to the original MLDA; reducing a number of eigenvectors during data reduction did not always lead to higher classification accuracy, since noise as well as the signal important for classification were removed. Our findings provide important information for schizophrenia research and may improve accuracy of computer aided diagnostics of neuropsychiatric diseases.
ER  -

JANOUŠOVÁ, Eva; Daniel SCHWARZ and Tomáš KAŠPÁREK. Combining various types of classifiers and features extracted from magnetic resonance imaging data in schizophrenia recognition. \textit{Psychiatry Research: Neuroimaging}. CLARE: ELSEVIER IRELAND LTD, 2015, vol.~232, No~3, p.~237-249. ISSN~0925-4927. Available from: https://doi.org/10.1016/j.pscychresns.2015.03.004.

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