黑质
磁化率加权成像
磁共振成像
神经黑素
帕金森病
神经退行性变
中脑
病理
医学
病态的
红核
脑干
神经科学
核医学
心理学
疾病
放射科
中枢神经系统
核心
作者
Jannik Prasuhn,Robert Strautz,Felicitas Lemmer,Shalida Dreischmeier,Meike Kasten,Henrike Hanßen,Marcus Heldmann,Norbert Brüggemann
出处
期刊:Journal of Parkinson's disease
[IOS Press]
日期:2022-05-24
卷期号:12 (4): 1191-1200
被引量:8
摘要
Degeneration of dopaminergic neurons within the brainstem substantia nigra (SN) is both a pathological hallmark of Parkinson's disease (PD) and a major contributor to symptom expression. Therefore, non-invasive evaluation of the SN is critical for diagnosis and evaluation of disease progression. Hyperechogenicity (HE+) on midbrain transcranial sonography (TCS) supports the clinically established diagnosis of PD. Further, postmortem studies suggest involvement of neuromelanin (NM) loss and iron deposition in nigral neurodegeneration and HE+ emergence. However, the associations between HE+ and signs of nigral NM loss and iron deposition revealed by magnetic resonance imaging (MRI) have not been examined.To elucidate the magnetic resonance- (MR-) morphological representation of the HE+ by NM-weighted (NMI) and susceptibility-weighted MRI (SWI).Thirty-four PD patients and 29 healthy controls (HCs) received TCS followed by NMI and SWI. From MR images, two independent raters manually identified the SN, placed seeds in non-SN midbrain areas, and performed semi-automated SN segmentation with different thresholds based on seed mean values and standard deviations. Masks of the SN were then used to extract mean area, mean signal intensity, maximal signal area, maximum signal (for NMI), and minimum signal (for SWI).There were no significant differences in NMI- and SWI-based parameters between patients and HCs, and no significant associations between HE+ extent and NMI- or SWI-based parameters.Hyperechogenicity on TCS appears unrelated to PD pathology revealed by NMI and SWI. Thus, TCS and MRI parameters should be considered complementary, and the pathophysiological correlates of HE+ require further study.
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