Abstract
Object
To investigate the effect of temperature (0 versus 37°C) in the high-resolution magic angle spinning spectroscopy (HRMAS) pattern of human brain tumor biopsies and its influence in recognition-based tumor type prediction. This proof-of-principle study addressed the bilateral discrimination between meningioma (MM) and glioblastoma multiforme (GBM) cases.
Materials and methods
Forty-three tumor biopsy samples were collected (20 MM and 23 GBM), kept frozen and later analyzed at 0°C and 37°C by HRMAS. Post-HRMAS histopathology was used to validate the tumor type. Time-course experiments (100 min) at both temperatures were carried out to monitor HRMAS pattern changes. Principal component analysis and linear discriminant analysis were used for classifier development with a training set of 20 biopsies.
Results
Temperature-dependent, spectral pattern changes mostly affected mobile lipids and choline-containing compounds resonances and were essentially reversible. Incubation of 3 MM and 3 GBM at 37°C during 100 minutes produced irreversible pattern changes below 13% in a few resonances. Classification performance of an independent test set of 7 biopsies was 100% for the pulse-and-acquire, CPMG at echo times (TE) of 30 ms and 144 ms and Hahn Echo at TE 30 ms at 0°C and 37°C. The performance for Hahn Echo spectra at 136 ms was 83.3% at 0°C and 100% at 37°C.
Conclusion
The spectral pattern of mobile lipids changes reversibly with temperature. HRMAS demonstrated potential for automated brain tumor biopsy classification. No advantage was obtained when acquiring spectra at 37°C with respect to 0°C in most of the conditions used for the discrimination addressed.
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Abbreviations
- ASCII:
-
American Standard Code for Information Interchange
- ChCCp:
-
Choline-containing compounds
- CPMG:
-
Carr-Purcell-Meiboom-Gill
- GBM:
-
Glioblastoma multiforme
- HRMAS:
-
High resolution magic angle spinning
- LDA:
-
Linear discriminant analysis
- LOO-CV:
-
Leave-one-out cross-validation
- ML:
-
Mobile lipids
- MM:
-
Meningothelial meningioma
- PCA:
-
Principal component analysis
- TE:
-
Echo time
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Contract/Grant sponsor: Funding from eTUMOUR (LIFESCIHEALTH-503094), Health Agents (IST-027214), MEDIVO2 (MEC, SAF 2005-03650) and PHENOIMA (MICINN, SAF2008-03323).
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Valverde-Saubí, D., Candiota, A.P., Molins, M.A. et al. Short-term temperature effect on the HRMAS spectra of human brain tumor biopsies and their pattern recognition analysis. Magn Reson Mater Phy 23, 203–215 (2010). https://doi.org/10.1007/s10334-010-0218-7
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DOI: https://doi.org/10.1007/s10334-010-0218-7