机构地区:[1]中山大学第一附属医院放射科,广州510080
出 处:《中华放射学杂志》2010年第9期963-968,共6页Chinese Journal of Radiology
摘 要:目的 测定3.0 T场强下,小腿骨骼肌1H-MRS中可见的代谢物分子和水分子中质子的横向弛豫时间(T1)和纵向弛豫时间(T2)值,为实现采用1H-MRS进行骨骼肌各代谢物含量的测定奠定基础,并为骨骼肌1H-MRS检查的参数优化提供依据.方法 24名志愿者,采用随机数字表将其随机分为2组,分别行小腿比目鱼肌和胫骨前肌的弛豫时间测定.采用单体素受激回波采集法进行1H-MRS数据采集,T1时间测定采用渐进饱和法,T2时间测定采用改变TE法.代谢物浓度计算采用以水为内部参照方法,经测定的T1、T2时问校正后获得.对不同肌肉的相同参数所获数据之间比较采用两独立样本均数的t检验.结果 24名健康志愿者中共得到22组数据(比目鱼肌12组,胫骨前肌10组).健康成人小腿比目鱼肌中水、肌酸-甲基3(Cr3)、三甲基胺(TMA)、肌细胞外脂肪(EMCL)、肌细胞内脂肪(IMCL)的T1值分别为(1384.0±36.9)、(1064.0±167.0)、(964.2±144.0)、(373.0±46.8)、(374.7±20.6)ms,T2值分别为(26.5±1.2)、(100.2±19.3)、(149.1±32.7)、(81.4±5.2)、(84.7±4.2)ms 胫骨前肌中水、Cr3、TMA、EMCL、IMCL的T1值分别为(1307.0±24.4)、(945.7±132.0)、(968.3±127.0)、(372.7±39.2)、(412.8±80.2)ms,T2值分别为(27.1±0.9)、(135.3±18.2)、(62.1±6.0)、(84.3±4.0)、(90.7±3.2)ms.经上述弛豫时间校正后,健康成人小腿比目鱼肌和胫骨前肌各代谢物绝对浓度Cr3为(33.1±3.7)和(31.7±3.1)mmol/kg、TMA为(35.2±3.2)和(32.9±5.2)mmol/kg、EMCL为(12.2±5.0)和(8.9±4.9)mmol/kg、IMCL为(9.0±2.4)和(3.0±0.8)mmol/kg,其中胫骨前肌IMCL含量明显小于比目鱼肌,两者的差异有统计学意义(t=8.024,P〈0.01),胫骨前肌和比目鱼肌其他代谢物含量差异无统计学意义(t值分别为0.926、1.264、1.542,P值均〉0.05).结论 该研究较准确地测定了骨�Objectiye To measure longitudinal (T1) and transverse (T2 ) relaxation time of metabolites in m. soleus (SOL) and m. tibialis anterior TA of healthy volunteers at 3.0 T through 1H-MRS and optimize measurement protocols. Methods Altogether 24 healthy volunteers were recruited in the study. All subjects signed a letter of informed consent. After divided into 2 groups randomly by the table of random number, 1H-MRS measurements with stimulated echo acquisition mode (STEAM) sequence were undertaken in SOL and TA separately. Progressive saturation method was used for T1 measurement. Spectra with 8 different TRs (770,900,1000, 1100,1200,1500,2000 and 3000ms ) were acquired with TE=20 ms.T2 time was measured by changing TE. Altogether 8 TEs (20,30,45,60,90,135,200 and 270 ms) were used with TR = 3000 ms. Metabolites' concentration was calculated through T1 and T2 correction using water as internal reference. The t test was used for statisties. Results Altogether 22 groups of data were gained ( 12 for SOL, 10 for TA ) . T1 value of water, Creatine-CH3 ( Cr3 ), Trimethyl amonium ( TMA ),extramyocellular lipid (EMCL) and intramyocellular lipid (IMCL) in SOL were ( 1384. 0 ± 36. 9 ),( 1064. 0 ± 167.0), (964. 2 ± 144. 0 ), ( 373.0 ± 46. 8 ), ( 374. 7 ± 20. 6) ms respectively and T2 value were (26.5 ±1.2), (100.2±19.3), (149. 1 ±32.7), (81.4±5.2), (84.7±4.2) ms. InTA T1 value of water, Cr3, TMA, EMCL, and IMCL were ( 1307. 0 ± 24.4), (945.7 ± 132. 0), (968.3 ± 127. 0),(372. 7 ± 39. 2), (412. 8 ±80. 2) ms respectively and T2 value were (27. 1 ± 0. 9), (135.3 ± 18. 2 ),(62.1 ± 6. 0), ( 84. 3 ± 4. 0 ), ( 90. 7 ± 3.2 ) ms. After corrected by the calculated relaxation times, the concentrations of Cr3 in SOL and TA were (33. 1 ± 3.7) and (31.7 ± 3. 1 ) mmol/kg respectively, TMA (35.2±3.2) and (32.9 ±5.2) mmol/kg, EMCL (12.2 ±5.0) and (8.9 ±4.9) mmol/kg, IMCL �
分 类 号:R445.2[医药卫生—影像医学与核医学]
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