中山大学附属第一医院放射诊断科,广东 广州 510080
冯艳青,硕士,研究方向:腹部影像学,E-mail:fengyq@mail.sysu.edu.cn
收稿:2021-09-02,
纸质出版:2021-11-20
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冯艳青,谢定祥,李周雷等.钆对比剂顺磁性弛豫增强效能比较的体模研究[J].中山大学学报(医学科学版),2021,42(06):816-823.
FENG Yan-qing,XIE Ding-xiang,LI Zhou-lei,et al.Comparison of Efficiency of Paramagnetic Relaxation Enhancement of Gadolinium-Based Contrast Agents: a Phantom Study[J].Journal of Sun Yat-sen University(Medical Sciences),2021,42(06):816-823.
冯艳青,谢定祥,李周雷等.钆对比剂顺磁性弛豫增强效能比较的体模研究[J].中山大学学报(医学科学版),2021,42(06):816-823. DOI: 10.13471/j.cnki.j.sun.yat-sen.univ(med.sci).2021.0603.
FENG Yan-qing,XIE Ding-xiang,LI Zhou-lei,et al.Comparison of Efficiency of Paramagnetic Relaxation Enhancement of Gadolinium-Based Contrast Agents: a Phantom Study[J].Journal of Sun Yat-sen University(Medical Sciences),2021,42(06):816-823. DOI: 10.13471/j.cnki.j.sun.yat-sen.univ(med.sci).2021.0603.
目的
2
比较5种常用钆对比剂(GBCAs)在实验室条件下在相同的稀释比和摩尔浓度下的顺磁性弛豫增强效能。
方法
2
收集5种常用GBCAs,包括2种线性及3种大环类GBCAs,并按照相同稀释比用蒸馏水将其制备成相同摩尔浓度的体模。在3.0 T MR 扫描仪上对人体志愿者及5组体模按照相同扫描方案和参数进行扫描后,在图像后处理工作站上画 ROI 测量体模、邻近小腿肌肉和周围空气的 T
1
WI 信号强度和 T
1
值,并计算 T
1
WI 相对信号强度(RSI)和 T
1
-mapping 的 T
1
弛豫速率(R
1
)、计算信噪比(SNR)、对比噪声比(CNR)。分析5组体模溶液信号强度(Sp)、RSI、T
1
值、R
1
、SNR、CNR 与GBCAs摩尔浓度的相关性,并比较5种GBCAs之间的 Sp、RSI、T
1
值、R
1
、SNR和CNR 的差异。
结果
2
5 种GBCAs 配备成相同摩尔浓度的稀释液,钆布醇原液使用容积最小。5种GBCAs的 Sp、RSI 与摩尔浓度均呈曲线相关(
r
s
=0),T
1
值、SNR 与摩尔浓度呈负相关(
r
s
<
0),R
1
、CNR 和摩尔浓度呈正相关(
r
s
>
0)。5种GBCAs之间的 Sp、RSI、T
1
值、R
1
、SNR和CNR 的差异无统计学意义,线性与大环类GBCAs之间的Sp、RSI、T
1
值、R
1
、SNR和CNR 的差异无统计学意义。
结论
2
5种线性和大环类GBCAs蒸馏水体模在相同摩尔浓度下的 T
1
WI 信号强度和 T
1
值无差异,并且过高和过低的GBCAs摩尔浓度都将使体模的T
1
WI 信号强度下降,而 T
1
值会随摩尔浓度的增加而持续下降。
Objective
2
To compare the efficiency of paramagnetic relaxation enhancement of five gadolinium-based contrast agents (GBCAs) at the same dilution ratio and molar concentration.
Methods
2
Five commonly used GBCAs, including 2 linear and 3 macrocyclic GBCAs, were employed and prepared to phantoms with the same molar concentration and dilution rate using distilled water. The phantoms were scanned in a 3.0 T MRI scanner under the same sequences and parameters. The regions of interest (ROIs) were drawn on the T
1
WI SE and T
1
mapping images to quantitatively measure the T
1
WI signal intensity and T
1
value from phantoms, calf muscles and surrounding air. The T
1
relaxation rate (R
1
), signal to noise ratio (SNR) and contrast noise ratio(CNR) were then calculated based on the T
1
WI signal intensity and T
1
value. The relationship from signal intensity (Sp), RSI, T
1
value,R
1
, SNR, CNR and molar concentration were analyzed. The differences from Sp, RSI, T
1
value, R
1
, SNR, CNR in 5 GBCAs were compared.
Results
2
In the process of phantoms’s preparation, the total used dose of Gd-DO3A-butrol was lowest. Sp and RSI were curvilinearly correlated with the molar concentration of GBCAs(
r
s
=0). While T
1
p and SNR were negatively correlated with the molar concentration of GBCAs(
r
s
<
0), R
1
and CNR were positively correlated with the molar concentration of GBCAs. The Sp, T
1
values, RSI, SNR and CNR from these five GBCAs were detected to be similar to each other, even between linear and macrocyclic GBCAs.
Conclusions
2
Under the same molar concentration, there are no significant difference of T
1
WI signal intensity and T
1
value between linear and macrocyclic GBCAs phantoms found from Magnetic resonance imaging. What’s more, both high and low molar concentration of gadolinium-based contrast agents can decrease the T
1
WI signal intensity of phantom, but the T
1
value will continue to decrease with the increase of the molar concentration.
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