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• W2096617917 abstract "<h3>Objective</h3> Transcranial sonography (TCS) shows characteristic hyperechogenicity of the substantia nigra (SN) in patients with Parkinson9s disease (PD). Although this feature is well established, sufficient observer reliability and diagnostic accuracy are prerequisites for advancements of this method. <h3>Methods</h3> The authors investigated both aspects in a cross-sectional study with four blinded TCS raters in 22 PD patients and 10 healthy controls. <h3>Results</h3> As expected, the authors found significant bilateral SN hyperechogenicity in PD patients. Quantitative computerised SN planimetry had a substantial intra- (intraclass correlation coefficient (ICC) 0.97 and 0.93 respectively for both hemispheres) and inter-rater reliability (ICC 0.84 and 0.89), while visual semiquantitative echogenicity grading of the SN revealed a moderate intrarater (weighted kappa 0.80 ipsilateral and 0.74 contralateral) and slight (0.33) to fair (0.51) inter-rater reliability only. Diagnostic accuracy measured as the area under the curve of receiver-operating characteristics plots was highest in TCS of the SN opposite the clinically most affected body side (planimetry 0.821, echogenicity grading 0.792) with a hyperechogenic area of 0.24 cm² as the optimum cut-off value for the differentiation between PD and controls (sensitivity 79%, specificity 81%). <h3>Conclusions</h3> The data demonstrate that the observer variability of SN planimetry is low in the hands of experienced investigators. This approach also offers adequate diagnostic accuracy. The authors conclude that reliable SN TCS data on PD can be achieved in clinical routine and multicentre trials when standardised analysis protocols and certain quality criteria of brain parenchyma sonography are met." @default.
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• W2096617917 date "2010-06-11" @default.
• W2096617917 modified "2023-09-25" @default.
• W2096617917 title "Reproducibility and diagnostic accuracy of substantia nigra sonography for the diagnosis of Parkinson's disease" @default.
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• W2096617917 doi "https://doi.org/10.1136/jnnp.2009.196352" @default.
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