Accurate classification of childhood brain tumours by in vivo(1)H MRS - A multi-centre study

Research output: Contribution to journalArticlepeer-review

Authors

  • Javier Vicente
  • Elies Fuster-Garcia
  • Salvador Tortajada
  • Juan M García-Gómez
  • Nigel Davies
  • Kal Natarajan
  • Pieter Wesseling
  • Daniel Monleón
  • Bernardo Celda
  • Montserrat Robles

Colleges, School and Institutes

Abstract

AIMS: To evaluate the accuracy of single-voxel Magnetic Resonance Spectroscopy ((1)H MRS) as a non-invasive diagnostic aid for paediatric brain tumours in a multi-national study. Our hypotheses are (1) that automated classification based on (1)H MRS provides an accurate non-invasive diagnosis in multi-centre datasets and (2) using a protocol which increases the metabolite information improves the diagnostic accuracy. METHODS: Seventy-eight patients under 16years old with histologically proven brain tumours from 10 international centres were investigated. Discrimination of 29 medulloblastomas, 11 ependymomas and 38 pilocytic astrocytomas (PILOAs) was evaluated. Single-voxel MRS was undertaken prior to diagnosis (1.5T Point-Resolved Spectroscopy (PRESS), Proton Brain Exam (PROBE) or Stimulated Echo Acquisition Mode (STEAM), echo time (TE) 20-32ms and 135-136ms). MRS data were processed using two strategies, determination of metabolite concentrations using TARQUIN software and automatic feature extraction with Peak Integration (PI). Linear Discriminant Analysis (LDA) was applied to this data to produce diagnostic classifiers. An evaluation of the diagnostic accuracy was performed based on resampling to measure the Balanced Accuracy Rate (BAR). RESULTS: The accuracy of the diagnostic classifiers for discriminating the three tumour types was found to be high (BAR 0.98) when a combination of TE was used. The combination of both TEs significantly improved the classification performance (p

Details

Original languageEnglish
Pages (from-to)658-667
JournalEuropean Journal of Cancer
Volume49
Issue number3
Publication statusPublished - 2012