A PITFALL ASSOCIATED WITH DETERMINATION OF TRANSVERSE RELAXATION-TIMES OF THE P-31 NMR SIGNALS OF ATP USING THE HAHN SPIN-ECHO

被引：10

作者：

JUNG, WI

STRAUBINGER, K

BUNSE, M

WIDMAIER, S

SCHICK, F

KUPER, K

DIETZE, G

LUTZ, O

机构：

[1] UNIV TUBINGEN, INST PHYS, MORGENSTELLE 14, W-7400 TUBINGEN 1, GERMANY

[2] MAX GRUNDIG KLIN, W-7580 BUHL 13, GERMANY

来源：

MAGNETIC RESONANCE IN MEDICINE | 1993年 / 30卷 / 01期

关键词：

MRS; P-31; IN-VIVO; HUMAN;

D O I：

10.1002/mrm.1910300122

中图分类号：

R8 [特种医学]; R445 [影像诊断学];

学科分类号：

1002 ; 100207 ; 1009 ;

摘要：

T2 measurements of P-31 NMR signals of ATP using the Hahn 90-degrees-180-degrees spin-echo sequence imply difficulties whenever the 180-degrees pulse angle is not completely perfect. The reason for this finding is the crucial influence of the J-couplings of the ATP signals which result in intensity modulations and consequently in false T2 values even when the echo times are chosen to TE = n/J. Examinations on the calf muscles of healthy volunteers were performed to demonstrate this effect and its influence on in vivo T2 determinations. The T2 relaxation times evaluated with the Hahn spin-echo in combination with a Helmholtz coil are far shorter than the true T2 values.

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页码：138 / 141

页数：4

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