H-1-MRS internal thermometry in test-objects (phantoms) to within 0.1 K for quality assurance in long-term quantitative MR studies

TY - JOUR

T1 - H-1-MRS internal thermometry in test-objects (phantoms) to within 0.1 K for quality assurance in long-term quantitative MR studies

AU - Samson, R S

AU - Thornton, J S

AU - McLean, M A

AU - Williams, S C R

AU - Tofts, P S

PY - 2006/8

Y1 - 2006/8

N2 - Many magnetic resonance test-object properties are temperature-dependent, with typical temperature coefficients of similar to 2-3% K-1. Therefore, to achieve consistent quality assurance measurements to within 1%, test object temperatures should ideally be known to within 0.3 K. Proton magnetic resonance spectroscopy has previously been used to estimate accurately absolute tissue temperature in vivo, based on the linear temperature dependence of the chemical shift difference between water and temperature-stable reference metabolites such as N-acetylaspartate. In this study, this method of 'internal thermometry' in quality assurance test-objects was investigated, and in particular the value of sodium 3-(trimethylsilyl)propane-1-sulfonate (DSS) as a chemical shift reference was demonstrated. The relationship between the DSS-water chemical shift difference (sigma, expressed in ppm) and temperature tau (in K) was shown to be tau = 764.55 (+/- 5.05) - 97.72 (+/- 1.05) sigma (286

AB - Many magnetic resonance test-object properties are temperature-dependent, with typical temperature coefficients of similar to 2-3% K-1. Therefore, to achieve consistent quality assurance measurements to within 1%, test object temperatures should ideally be known to within 0.3 K. Proton magnetic resonance spectroscopy has previously been used to estimate accurately absolute tissue temperature in vivo, based on the linear temperature dependence of the chemical shift difference between water and temperature-stable reference metabolites such as N-acetylaspartate. In this study, this method of 'internal thermometry' in quality assurance test-objects was investigated, and in particular the value of sodium 3-(trimethylsilyl)propane-1-sulfonate (DSS) as a chemical shift reference was demonstrated. The relationship between the DSS-water chemical shift difference (sigma, expressed in ppm) and temperature tau (in K) was shown to be tau = 764.55 (+/- 5.05) - 97.72 (+/- 1.05) sigma (286

U2 - 10.1002/nbm.1033

DO - 10.1002/nbm.1033

M3 - Article

VL - 19

SP - 560

EP - 565

JO - Nmr in Biomedicine

JF - Nmr in Biomedicine

IS - 5

ER -