Lydia Chougar
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View article: Spinal cord involvement and cardiovascular autonomic dysfunction in Parkinson’s disease
Spinal cord involvement and cardiovascular autonomic dysfunction in Parkinson’s disease Open
Background : Patients with Parkinson’s disease (PD) frequently present autonomic cardiovascular dysfunction. This study investigated the involvement of autonomic centers in the upper thoracic spinal cord in cardiovascular dysfunction in pa…
View article: Deep Learning to Differentiate Parkinsonian Syndromes Using Multimodal <scp>Magnetic Resonance Imaging</scp>: A Proof‐of‐Concept Study
Deep Learning to Differentiate Parkinsonian Syndromes Using Multimodal <span>Magnetic Resonance Imaging</span>: A Proof‐of‐Concept Study Open
Background The differentiation between multiple system atrophy (MSA) and Parkinson's disease (PD) based on clinical diagnostic criteria can be challenging, especially at an early stage. Leveraging deep learning methods and magnetic resonan…
View article: Longitudinal <scp>PET</scp> and <scp>MRI</scp> Evaluation in Late Onset Rasmussen Encephalitis: A Series of Three Cases
Longitudinal <span>PET</span> and <span>MRI</span> Evaluation in Late Onset Rasmussen Encephalitis: A Series of Three Cases Open
Background Rasmussen's encephalitis (RE) is a rare, chronic, neurological disorder characterized by progressive focal epilepsy and hemispheric atrophy. Late‐onset RE poses diagnostic challenges due to atypical clinical features and nonspec…
View article: Automatic quality control of brain 3D FLAIR MRIs for a clinical data warehouse
Automatic quality control of brain 3D FLAIR MRIs for a clinical data warehouse Open
View article: Substantia nigra degeneration in spinocerebellar ataxia 2 and 7 using neuromelanin‐sensitive imaging
Substantia nigra degeneration in spinocerebellar ataxia 2 and 7 using neuromelanin‐sensitive imaging Open
Objective Spinocerebellar ataxias (SCA) are neurodegenerative diseases with widespread lesions across the central nervous system. Ataxia and spasticity are usually predominant, but patients may also present with parkinsonism. We aimed to c…
View article: Projected pooling loss for red nucleus segmentation with soft topology constraints
Projected pooling loss for red nucleus segmentation with soft topology constraints Open
We propose an effective method to automatically segment the red nucleus which is based on a new loss for introducing topology constraints in deep learning segmentation.
View article: The intriguing effect of frequency disentangled learning on medical image segmentation
The intriguing effect of frequency disentangled learning on medical image segmentation Open
International audience
View article: Contribution of <scp>MRI</scp> for the Early Diagnosis of Parkinsonism in Patients with Diagnostic Uncertainty
Contribution of <span>MRI</span> for the Early Diagnosis of Parkinsonism in Patients with Diagnostic Uncertainty Open
Background International clinical criteria are the reference for the diagnosis of degenerative parkinsonism in clinical research, but they may lack sensitivity and specificity in the early stages. Objectives To determine whether magnetic r…
View article: Spinal cord ischemia revealed by a Brown-Sequard syndrome and caused by a calcified thoracic disc extrusion with spontaneous regression: a case report and review of the literature
Spinal cord ischemia revealed by a Brown-Sequard syndrome and caused by a calcified thoracic disc extrusion with spontaneous regression: a case report and review of the literature Open
Background Thoracic disc herniation is relatively uncommon, accounting for less than 1% of all spinal herniations. Although most often asymptomatic, they may represent a rare cause of spinal cord ischemia. Case report We report the case of…
View article: Semi-supervised Domain Adaptation for Automatic Quality Control of FLAIR MRIs in a Clinical Data Warehouse
Semi-supervised Domain Adaptation for Automatic Quality Control of FLAIR MRIs in a Clinical Data Warehouse Open
View article: Temporo-basal sulcal connections: a manual annotation protocol and an investigation of sexual dimorphism and heritability
Temporo-basal sulcal connections: a manual annotation protocol and an investigation of sexual dimorphism and heritability Open
The temporo-basal region of the human brain is composed of the collateral, the occipito-temporal, and the rhinal sulci. We manually rated (using a novel protocol) the connections between rhinal/collateral (RS-CS), collateral/occipito-tempo…
View article: Frequency Disentangled Learning for Segmentation of Midbrain Structures from Quantitative Susceptibility Mapping Data
Frequency Disentangled Learning for Segmentation of Midbrain Structures from Quantitative Susceptibility Mapping Data Open
One often lacks sufficient annotated samples for training deep segmentation models. This is in particular the case for less common imaging modalities such as Quantitative Susceptibility Mapping (QSM). It has been shown that deep models ten…
View article: Comparison of mean diffusivity, R2* relaxation rate and morphometric biomarkers for the clinical differentiation of parkinsonism
Comparison of mean diffusivity, R2* relaxation rate and morphometric biomarkers for the clinical differentiation of parkinsonism Open
View article: Golgi localization of SARS-CoV-2 spike protein and interaction with furin in cerebral COVID-19 microangiopathy: a clue to the central nervous system involvement?
Golgi localization of SARS-CoV-2 spike protein and interaction with furin in cerebral COVID-19 microangiopathy: a clue to the central nervous system involvement? Open
In a neuropathological series of 20 COVID-19 cases, we analyzed six cases (three biopsies and three autopsies) with multiple foci predominantly affecting the white matter as shown by MRI. The cases presented with microhemorrhages evocative…
View article: <scp>Neuromelanin‐Sensitive Magnetic Resonance Imaging</scp> Changes in the Locus Coeruleus/Subcoeruleus Complex in Patients with Typical and Atypical Parkinsonism
<span>Neuromelanin‐Sensitive Magnetic Resonance Imaging</span> Changes in the Locus Coeruleus/Subcoeruleus Complex in Patients with Typical and Atypical Parkinsonism Open
Background The locus coeruleus/subcoeruleus complex (LC/LsC) is a structure comprising melanized noradrenergic neurons. Objective To study the LC/LsC damage across Parkinson's disease (PD) and atypical parkinsonism in a large group of subj…
View article: Apport de l'IRM multimodale pour le diagnostic différentiel des syndromes parkinsoniens
Apport de l'IRM multimodale pour le diagnostic différentiel des syndromes parkinsoniens Open
Parkinsonism is defined by the association of resting tremor, rigidity, bradykinesia and postural instability. Parkinson's disease (PD) is the main cause of neurodegenerative parkinsonism. Atypical parkinsonism refers to rare neurodegenera…
View article: Fourier Disentangled Multimodal Prior Knowledge Fusion for Red Nucleus Segmentation in Brain MRI
Fourier Disentangled Multimodal Prior Knowledge Fusion for Red Nucleus Segmentation in Brain MRI Open
Early and accurate diagnosis of parkinsonian syndromes is critical to provide appropriate care to patients and for inclusion in therapeutic trials. The red nucleus is a structure of the midbrain that plays an important role in these disord…
View article: Regional Selectivity of Neuromelanin Changes in the Substantia Nigra in Atypical Parkinsonism
Regional Selectivity of Neuromelanin Changes in the Substantia Nigra in Atypical Parkinsonism Open
Background Neurodegeneration in the substantia nigra pars compacta (SNc) in parkinsonian syndromes may affect the nigral territories differently. Objective The objective of this study was to investigate the regional selectivity of neurodeg…
View article: Association of Clinical, Biological, and Brain Magnetic Resonance Imaging Findings With Electroencephalographic Findings for Patients With COVID-19
Association of Clinical, Biological, and Brain Magnetic Resonance Imaging Findings With Electroencephalographic Findings for Patients With COVID-19 Open
The results from this cohort of patients hospitalized with COVID-19 suggest there are clinical, EEG, and MRI patterns that could delineate specific COVID-19-related encephalopathy and guide treatment strategy.
View article: Automated Categorization of Parkinsonian Syndromes Using <scp>Magnetic Resonance Imaging</scp> in a Clinical Setting
Automated Categorization of Parkinsonian Syndromes Using <span>Magnetic Resonance Imaging</span> in a Clinical Setting Open
Background Machine learning algorithms using magnetic resonance imaging (MRI) data can accurately discriminate parkinsonian syndromes. Validation in patients recruited in routine clinical practice is missing. Objective The aim of this stud…
View article: MR Imaging of the Olfactory Bulbs in Patients with COVID-19 and Anosmia: How to Avoid Misinterpretation
MR Imaging of the Olfactory Bulbs in Patients with COVID-19 and Anosmia: How to Avoid Misinterpretation Open
We recently read the article entitled "Brain Imaging of Patients with COVID-19: Findings at an Academic Institution during the Height of the Outbreak in New York City," a retrospective neuroimaging cohort by Lin et al.[1][1] The authors re…
View article: Retrospective Observational Study of Brain MRI Findings in Patients with Acute SARS-CoV-2 Infection and Neurologic Manifestations
Retrospective Observational Study of Brain MRI Findings in Patients with Acute SARS-CoV-2 Infection and Neurologic Manifestations Open
Background This study provides a detailed imaging assessment in a large series of patients infected with coronavirus disease 2019 (COVID-19) and presenting with neurologic manifestations. Purpose To review the MRI findings associated with …
View article: The Role of Magnetic Resonance Imaging for the Diagnosis of Atypical Parkinsonism
The Role of Magnetic Resonance Imaging for the Diagnosis of Atypical Parkinsonism Open
The diagnosis of Parkinson's disease and atypical Parkinsonism remains clinically difficult, especially at the early stage of the disease, since there is a significant overlap of symptoms. Multimodal MRI has significantly improved diagnost…
View article: Atypical Deep Cerebral Vein Thrombosis with Hemorrhagic Venous Infarction in a Patient Positive for COVID-19
Atypical Deep Cerebral Vein Thrombosis with Hemorrhagic Venous Infarction in a Patient Positive for COVID-19 Open
There is growing evidence that Severe Acute Respiratory Syndrome coronavirus 2 (SARS-CoV-2) has a neurotropic and neuroinvasive potential. In particular, neurologic complications associated with the infection by SARS-CoV-2 include strokes …
View article: Atypical Deep Cerebral Vein Thrombosis with Hemorrhagic Venous Infarction in a COVID-19-Positive Patient
Atypical Deep Cerebral Vein Thrombosis with Hemorrhagic Venous Infarction in a COVID-19-Positive Patient Open
View article: Multiple sclerosis lesions in motor tracts from brain to cervical cord: spatial distribution and correlation with disability
Multiple sclerosis lesions in motor tracts from brain to cervical cord: spatial distribution and correlation with disability Open
Despite important efforts to solve the clinico-radiological paradox, correlation between lesion load and physical disability in patients with multiple sclerosis remains modest. One hypothesis could be that lesion location in corticospinal …
View article: Automated classification of neurodegenerative parkinsonian syndromes using multimodal magnetic resonance imaging in a clinical setting
Automated classification of neurodegenerative parkinsonian syndromes using multimodal magnetic resonance imaging in a clinical setting Open
Background Several studies have shown that machine learning algorithms using MRI data can accurately discriminate parkinsonian syndromes. Validation under clinical conditions is missing. Objectives To evaluate the accuracy for the categori…
View article: Signal Intensity within Cerebral Venous Sinuses on Synthetic MRI
Signal Intensity within Cerebral Venous Sinuses on Synthetic MRI Open
High signal intensity within the cerebral venous sinuses is a frequent finding on synthetic T1-weighted images. This corresponds to the hyperintensity noted at certain flow rates in the phantom experiment.
View article: Improving the Quality of Synthetic FLAIR Images with Deep Learning Using a Conditional Generative Adversarial Network for Pixel-by-Pixel Image Translation
Improving the Quality of Synthetic FLAIR Images with Deep Learning Using a Conditional Generative Adversarial Network for Pixel-by-Pixel Image Translation Open
Using deep learning, we improved the synthetic FLAIR image quality by generating FLAIR images that have contrast closer to that of conventional FLAIR images and fewer granular and swelling artifacts, while preserving the lesion contrast.
View article: Spatial distribution of multiple sclerosis lesions in the cervical spinal cord
Spatial distribution of multiple sclerosis lesions in the cervical spinal cord Open
Spinal cord lesions detected on MRI hold important diagnostic and prognostic value for multiple sclerosis. Previous attempts to correlate lesion burden with clinical status have had limited success, however, suggesting that lesion location…