Spectroscopic Evaluation of Glioma Grading at 3T: The Combined Role of Short and Long TE

Autor: Ioannis Tsougos, Konstantinos Fountas, E. Kapsalaki, Constantin Kappas, Kyriaki Theodorou, Evanthia Kousi, Evangelia Tsolaki, Ioannis V. Fezoulidis
Rok vydání: 2012
Předmět:
Zdroj: The Scientific World Journal
The Scientific World Journal, Vol 2012 (2012)
ISSN: 1537-744X
DOI: 10.1100/2012/546171
Popis: Purpose. To evaluate the diagnostic value of 3T1H-MRS in grading cerebral gliomas using short and long echo times.Methods. 1H-MRS was performed on 71 patients with untreated cerebral gliomas. Metabolite ratios of NAA/Cr, Cho/Cr, Cho/NAA, and mI/Cr were calculated for short and long TE and compared between low and high grade gliomas. Lipids were qualitatively evaluated. ROC analysis was performed to obtain the cut-off values for the metabolic ratios presenting statistical difference between the two glioma grades.Results. Intratumoral Cho/Cr at both TEs and long TE Cho/NAA were significantly different between low and high grade gliomas. Peritumoral NAA/Cr of both TEs, as well as long TE Cho/Cr and Cho/NAA ratios, significantly differentiated the two tumor grades. Diagnostic sensitivity of peritumoral short TE NAA/Cr proved to be superior over the other metabolic ratios, whereas intratumoral short TE Cho/Cr reached the highest levels of specificity and accuracy. Overall, short TE 1H-MRS reached higher total sensitivity in predicting glioma grade, over long TE.Conclusion. An advantage was found in using short TE over long TE 1H-MRS in the discrimination of low versus high grade gliomas. Moreover, the results suggested that the peritumoral area of gliomas may be more valuable in predicting glioma grade than using only the intratumoral area.
Databáze: OpenAIRE
Externí odkaz: