Model selection for DCE-T1 studies in glioblastoma.

Model selection for DCE-T1 studies in glioblastoma.
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DOI:
10.1002/mrm.23211
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发表时间:
2012-07
影响因子:
3.3
通讯作者:
Ewing, James. R.
Ewing, James. R.
中科院分区:
医学3区
文献类型:
--
作者:
Bagher-Ebadian, Hassan;Jain, Rajan;Nejad-Davarani, Siamak P.;Mikkelsen, Tom;Lu, Mei;Jiang, Quan;Scarpace, Lisa;Arbab, Ali S.;Narang, Jayant;Soltanian-Zadeh, Hamid;Paudyal, Ramesh;Ewing, James. R.

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采用造影剂(CA) Gd-DTPA对10例胶质母细胞瘤(GBM)患者进行动态对比增强t1加权MRI (DCE-T1)检查。采用多达三个参数的嵌套模型来估计血浆体积(vp),或vp和正向血管转移常数(Ktrans),或vp, Ktrans和反向血管转移常数(keep)。这些分别构成模型1、2和3。模型1主要出现在正常的无渗漏脑组织中,显示CA很少或没有渗漏。模型3主要出现在与肿瘤侵袭性部分相关的区域,模型2与模型3区域相邻,显示渗漏率降低。在患者样本中,vp约为肿瘤增强部分白质的四倍。Ktrans在模型2 (1.9 ×10−3 min−1)和模型3区域(1.9 ×10−2 min−1)之间变化了10倍。平均计算间隙(模型3)为5.5%。在模型3区域,获得了很好的曲线拟合,可以总结浓度-时间数据(平均R2 = 0.99)。我们认为,在实验条件下,标准模型的三个参数足以拟合GBM中的DCE-T1数据。
Dynamic Contrast Enhanced T1-Weighted MRI (DCE-T1) using the contrast agent (CA) Gd-DTPA was performed on ten patients with glioblastoma (GBM). Nested models with as many as three parameters were employed to estimate plasma volume (vp), or vp and forward vascular transfer constant (Ktrans), or vp, Ktrans, and the reverse vascular transfer constant (kep). These constituted Models 1, 2, and 3, respectively. Model 1 predominated in normal non-leaky brain tissue, showing little or no leakage of CA. Model 3 predominated in regions associated with aggressive portions of the tumor, and Model 2 bordered Model 3 regions, showing leakage at reduced rates. In the patient sample, vp was about four times that of white matter in the enhancing part of the tumor. Ktrans varied by a factor of ten between the Model 2 (1.9 ×10−3 min−1) and Model 3 regions (1.9 ×10−2 min−1). The mean calculated interstitial space (Model 3) was 5.5%. In Model 3 regions, excellent curve fits were obtained to summarize concentration-time data (mean R2 = 0.99). We conclude that the three parameters of the Standard Model are sufficient to fit DCE-T1 data in GBM under the conditions of the experiment.
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