Multiproject-multicenter evaluation of automatic brain tumor classification by magnetic resonance spectroscopy

Juan M. García-Gómez, Jan Luts, Margarida Julià-Sapé, Patrick Krooshof, Salvador Tortajada, Javier Vicente Robledo, Willem Melssen, Elies Fuster-García, Iván Olier, Geert Postma, Daniel Monleón, Àngel Moreno-Torres, Jesús Pujol, Ana Paula Candiota, M. Carmen Martínez-Bisbal, Johan Suykens, Lutgarde Buydens, Bernardo Celda, Sabine Van Huffel, Carles ArúsMontserrat Robles

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102 Citations (Scopus)

Abstract

Justification: Automatic brain tumor classification by MRS has been under development for more than a decade. Nonetheless, to our knowledge, there are no published evaluations of predictive models with unseen cases that are subsequently acquired in different centers. The multicenter eTUMOUR project (2004-2009), which builds upon previous expertise from the INTERPRET project (2000-2002) has allowed such an evaluation to take place. Materials and Methods: A total of 253 pairwise classifiers for glioblastoma, meningioma, metastasis, and low-grade glial diagnosis were inferred based on 211 SV short TE INTERPRET MR spectra obtained at 1.5 T (PRESS or STEAM, 20-32 ms) and automatically pre-processed. Afterwards, the classifiers were tested with 97 spectra, which were subsequently compiled during eTUMOUR. Results: In our results based on subsequently acquired spectra, accuracies of around 90% were achieved for most of the pairwise discrimination problems. The exception was for the glioblastoma versus metastasis discrimination, which was below 78%. A more clear definition of metastases may be obtained by other approaches, such as MRSI + MRI. Conclusions: The prediction of the tumor type of in-vivo MRS is possible using classifiers developed from previously acquired data, in different hospitals with different instrumentation under the same acquisition protocols. This methodology may find application for assisting in the diagnosis of new brain tumor cases and for the quality control of multicenter MRS databases. © 2008 The Author(s).
Original languageEnglish
Pages (from-to)5-18
JournalMagnetic Resonance Materials in Physics, Biology and Medicine
Volume22
DOIs
Publication statusPublished - 1 Feb 2009

Keywords

  • Brain tumors
  • Decision support systems
  • Magnetic resonance spectroscopy
  • Multicenter evaluation study
  • Pattern classification

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