European Radiology:成人毛细胞星形细胞瘤与胶质母细胞瘤的全自动多参数放射学模型

2022-04-16 shaosai MedSci原创

越来越多的证据表明,成人PAs不仅表现出不同的影像学表现,而且预后差异较大,具有与儿科PAs不同的遗传改变和基因表达特征。

毛细胞型星形细胞瘤(PA)是儿科人群中最常遇到的原发性中枢神经系统肿瘤。然而,PA也占成人脑肿瘤的1.5%,而且多达25%的PA患者年龄超过20岁。鉴别小儿PAs相对简单,因为大多数儿童PAs表现为较为典型通常为位于小脑具有壁层结节外观的囊肿块。然而,由于成人PA的影像学表现通常不典型因此鉴别诊断十分困难。特别是在成人PAs中,高级别胶质瘤(HGG,WHOIII-IV级)是最具挑战性和最关键的鉴别诊断。PAs的主要治疗方法是手术切除,HGGs的标准治疗方法除手术外还要进行放疗或化疗。

越来越多的证据表明,成人PAs不仅表现出不同的影像学表现,而且预后差异较大,具有与儿科PAs不同的遗传改变和基因表达特征。此外,以前的研究显示,常规MRI和部分先进的成像参数,如弥散、灌注或MR波谱成像,在区分PAs和HGGs方面的价值有限。放射性组学是影像科学的一个新兴分支,它将放射学图像转化为可挖掘的影像数据,在预测弥漫性胶质瘤的分子状态、等级和预后方面显示出良好的效果。

近日,发表在European Radiology杂志的一项研究开发一个放射组学模型来区分成人PA和HGGs,为该类患者术前的准确诊断及治疗方案制定提供了可能

项回顾性研究包括302名患有PA(n = 62)或HGG(n = 240)的成年患者。这些病人被随机分为训练组(n = 211)和测试组(n = 91)。获得临床数据,并从多参数MRI中提取了放射学特征(n = 372),并进行了自动肿瘤分割。在用F-score进行特征选择后,训练了一个带子采样的轻型梯度提升机分类器,以建立三个模型。(1)临床模型、(2)放射组学模型、(3)临床和放射组学组合模型。同时对医生的诊断表现进行了评估。分类器的性能在测试集中得到了验证。应用SHapley Additive exPlanations(SHAP)来探索模型的可解释性。 

本研究共选择了15个放射学特征。在测试组中,临床和放射组学联合模型(曲线下面积[AUC],0.93)的性能明显高于临床模型(AUC,0.79,p = 0.037),并与放射组学模型(AUC,0.92,p = 0.828)性能相似。临床和放射组学联合模型的性能也明显高于医生(AUC,0.76-0.81,p < 0.05)。SHAP的模型解释表明,来自T2加权图像的较低的瘤内异质性与PA诊断高度相关。 


 结合临床和放射组学模型的正确和错误分类的典型病例。(a) 19岁男性,患有PA,由临床和放射组学联合模型正确分类。Dice系数为 0.99. (b) 60岁男性,患有PA,被临床和放射组学联合模型错误地分类为高级别胶质瘤(HGG)。Dice系数为0.99

本研究表明,全自动的临床和放射组学组合模型有助于区分成人PAs和HGGs。来自T2的二阶特征在鉴别诊断中十分重要,同时提示PAs比HGGs具有更少的瘤内组织异质性的基本病理生理学特征

原文出处

Yae Won Park,Jihwan Eom,Dain Kim,et al.A fully automatic multiparametric radiomics model for differentiation of adult pilocytic astrocytomas from glioblastomas.DOI:10.1007/s00330-022-08575-z

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    2022-04-15 kkunny
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