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A prospective multi-centre study of susceptibility map-weighted MRI for the diagnosis of neurodegenerative parkinsonism

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Abstract

Objectives

This study aimed to compare susceptibility map-weighted imaging (SMwI) using various MRI machines (three vendors) with N-3-fluoropropyl-2-β-carbomethoxy-3-β-(4-iodophe nyl)nortropane (18F-FP-CIT) PET in the diagnosis of neurodegenerative parkinsonism in a multi-centre setting.

Methods

We prospectively recruited 257 subjects, including 157 patients with neurodegenerative parkinsonism, 54 patients with non-neurodegenerative parkinsonism, and 46 healthy subjects from 10 hospitals between November 2019 and October 2020. All participants underwent both SMwI and 18F-FP-CIT PET. SMwI was interpreted by two independent reviewers for the presence or absence of abnormalities in nigrosome 1, and discrepancies were resolved by consensus. 18F-FP-CIT PET was used as the reference standard. Inter-observer agreement was tested using Cohen’s kappa coefficient. McNemar’s test was used to test the agreement between the interpretations of SMwI and 18F-FP-CIT PET per participant and substantia nigra (SN).

Results

The inter-observer agreement was 0.924 and 0.942 per SN and participant, respectively. The diagnostic sensitivity of SMwI was 97.9% and 99.4% per SN and participant, respectively; its specificity was 95.9% and 95.2%, respectively, and its accuracy was 97.1% and 97.7%, respectively. There was no significant difference between the results of SMwI and 18F-FP-CIT PET (p > 0.05, for both SN and participant).

Conclusions

This study demonstrated that the high diagnostic performance of SMwI was maintained in a multi-centre setting with various MRI scanners, suggesting the generalisability of SMwI for determining nigrostriatal degeneration in patients with parkinsonism.

Key Points

Susceptibility map-weighted imaging helps clinicians to predict nigrostriatal degeneration.

The protocol for susceptibility map-weighted imaging can be standardised across MRI vendors.

Susceptibility map-weighted imaging showed diagnostic performance comparable to that of dopamine transporter PET in a multi-centre setting with various MRI scanners.

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Abbreviations

18F-FP-CIT:

N-3-fluoropropyl-2-β-carbomethoxy-3-β-(4-iodophenyl)nortropane

DAT:

Dopamine transporter

H&Y:

Hoehn and Yahr

IPD:

Idiopathic Parkinson’s disease

MSA:

Multiple system atrophy

PSP:

Progressive supranuclear palsy

QSM:

Quantitative susceptibility map**

SMwI:

Susceptibility map-weighted imaging

SN:

Substantia nigra

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Funding

This work was supported by a grant from the Heuron Co., Ltd; and a grant from the Basic Research in Science and Engineering Program through the National Research Foundation (NRF) funded by the Korean government (MSIT) (No. 2021R1C1C1003676).

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Correspondence to Eung Yeop Kim.

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The scientific guarantor of this publication is Eung Yeop Kim.

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The authors of this manuscript declare no relationships with any companies, whose products or services may be related to the subject matter of the article.

Statistics and biometry

No complex statistical methods were necessary for this paper.

Informed consent

Written informed consent was obtained from all subjects (patients) in this study.

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Institutional Review Board approval was obtained.

Methodology

• prospective

• diagnostic study

• multicentre study

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Sung, Y.H., Kim, JS., Yoo, SW. et al. A prospective multi-centre study of susceptibility map-weighted MRI for the diagnosis of neurodegenerative parkinsonism. Eur Radiol 32, 3597–3608 (2022). https://doi.org/10.1007/s00330-021-08454-z

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  • DOI: https://doi.org/10.1007/s00330-021-08454-z

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