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The effects of paramagnetic contrast agents on metabolite protons in aqueous solution

机译:顺磁性造影剂对水溶液中代谢物质子的影响

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The longitudinal (R_1) and transverse (R_2) relaxivities of the clinically used contrast agents Gd(DTPA)~(2-), Gd(DOTA)~ and Gd(DTPA-BMA) have been determined in mixed aqueous metabolite solutions for choline, creatine and N-acetylaspartate. Measurements were performed at 1.5 T using a STEAM sequence on 25 mM metabolite solutions at pH = 7.4 and 22 ℃. The data showed that for all the contrast agents and metabolites, R_1 ~ R_2. The largest range of relaxivity values was found for Gd(DTPA)~(2-), where R_2 = 6.8 ± 0.3 mM~(-1) s~(-1) for choline and 1.5 ± 0.4 mM~(-1) s~(-1) for N-acetylaspartate. Variation in relaxivity values was attributed primarily to differences between the charges of the paramagnetic agent and metabolite. The maximum potential influence of the contrast agents on in vivo metabolite signals was calculated using the measured relaxivities.
机译:在胆碱的混合代谢水溶液中测定了临床使用的造影剂Gd(DTPA)〜(2-),Gd(DOTA)〜和Gd(DTPA-BMA)的纵向(R_1)和横向(R_2)弛豫性,肌酸和N-乙酰天门冬氨酸。使用STEAM序列在1.5 T下,在pH = 7.4和22℃的25 mM代谢产物溶液上进行测量。数据显示,对于所有造影剂和代谢产物,R_1〜R_2。发现Gd(DTPA)〜(2-)的弛豫值范围最大,其中胆碱的R_2 = 6.8±0.3 mM〜(-1)s〜(-1)和1.5±0.4 mM〜(-1)s N-乙酰天门冬氨酸〜(-1)。弛豫度值的变化主要归因于顺磁剂和代谢物的电荷之间的差异。使用测得的弛豫度计算造影剂对体内代谢产物信号的最大潜在影响。

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