Scientific article
Open access

A Multicenter Longitudinal MRI Study Assessing LeMan-PV Software Accuracy in the Detection of White Matter Lesions in Multiple Sclerosis Patients

Published inJournal of magnetic resonance imaging, vol. 58, no. 3, p. 864-876
Publication date2023-01-28
First online date2023-01-28

Background: Detecting new and enlarged lesions in multiple sclerosis (MS) patients is needed to determine their disease activity. LeMan-PV is a software embedded in the scanner reconstruction system of one vendor, which automatically assesses new and enlarged white matter lesions (NELs) in the follow-up of MS patients; however, multicenter validation studies are lacking.

Purpose: To assess the accuracy of LeMan-PV for the longitudinal detection NEL white-matter MS lesions in a multicenter clinical setting.

Study type: Retrospective, longitudinal.

Subjects: A total of 206 patients with a definitive MS diagnosis and at least two follow-up MRI studies from five centers participating in the Swiss Multiple Sclerosis Cohort study. Mean age at first follow-up = 45.2 years (range: 36.9-52.8 years); 70 males.

Field strength/sequence: Fluid attenuated inversion recovery (FLAIR) and T1-weighted magnetization prepared rapid gradient echo (T1-MPRAGE) sequences at 1.5 T and 3 T.

Assessment: The study included 313 MRI pairs of datasets. Data were analyzed with LeMan-PV and compared with a manual "reference standard" provided by a neuroradiologist. A second rater (neurologist) performed the same analysis in a subset of MRI pairs to evaluate the rating-accuracy. The Sensitivity (Se), Specificity (Sp), Accuracy (Acc), F1-score, lesion-wise False-Positive-Rate (aFPR), and other measures were used to assess LeMan-PV performance for the detection of NEL at 1.5 T and 3 T. The performance was also evaluated in the subgroup of 123 MRI pairs at 3 T.

Statistical tests: Intraclass correlation coefficient (ICC) and Cohen's kappa (CK) were used to evaluate the agreement between readers.

Results: The interreader agreement was high for detecting new lesions (ICC = 0.97, Pvalue < 10-20, CK = 0.82, P value = 0) and good (ICC = 0.75, P value < 10-12, CK = 0.68, P value = 0) for detecting enlarged lesions. Across all centers, scanner field strengths (1.5 T, 3 T), and for NEL, LeMan-PV achieved: Acc = 61%, Se = 65%, Sp = 60%, F1-score = 0.44, aFPR = 1.31. When both follow-ups were acquired at 3 T, LeMan-PV accuracy was higher (Acc = 66%, Se = 66%, Sp = 66%, F1-score = 0.28, aFPR = 3.03).

Data conclusion: In this multicenter study using clinical data settings acquired at 1.5 T and 3 T, and variations in MRI protocols, LeMan-PV showed similar sensitivity in detecting NEL with respect to other recent 3 T multicentric studies based on neural networks. While LeMan-PV performance is not optimal, its main advantage is that it provides automated clinical decision support integrated into the radiological-routine flow.

Evidence level: 4 TECHNICAL EFFICACY: Stage 2.

  • Lesion activity
  • Lesion segmentation
  • Longitudinal analysis
  • Longitudinal lesion segmentation
  • Multiple sclerosis
  • White matter lesions
Citation (ISO format)
TODEA, Alexandra Ramona et al. A Multicenter Longitudinal MRI Study Assessing LeMan-PV Software Accuracy in the Detection of White Matter Lesions in Multiple Sclerosis Patients. In: Journal of magnetic resonance imaging, 2023, vol. 58, n° 3, p. 864–876. doi: 10.1002/jmri.28618
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Article (Published version)
ISSN of the journal1053-1807

Technical informations

Creation04/03/2023 1:41:19 PM
First validation10/30/2023 9:07:48 AM
Update time10/30/2023 9:07:48 AM
Status update10/30/2023 9:07:48 AM
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