Abstract
Introduction
Our aims were to (1) assess the corticospinal tracts (CSTs) in infants with focal injury and healthy term controls using probabilistic tractography and (2) to correlate the conventional magnetic resonance imaging (MRI) and tractography findings in infants with focal injury with their later motor function.
Methods
We studied 20 infants with focal lesions and 23 controls using MRI and diffusion tensor imaging. Tract volume, fractional anisotropy (FA), apparent diffusion coefficient (ADC) values, axial diffusivity and radial diffusivity (RD) of the CSTs were determined. Asymmetry indices (AIs) were calculated by comparing ipsilateral to contralateral CSTs. Motor outcome was assessed using a standardized neurological examination.
Results
Conventional MRI was able to predict normal motor development (n = 9) or hemiplegia (n = 6). In children who developed a mild motor asymmetry (n = 5), conventional MRI predicted a hemiplegia in two and normal motor development in three infants. The AIs for tract volume, FA, ADC and RD showed a significant difference between controls and infants who developed a hemiplegia, and RD also showed a significant difference in AI between controls and infants who developed a mild asymmetry.
Conclusion
Conventional MRI was able to predict subsequent normal motor development or hemiplegia following focal injury in newborn infants. Measures of RD obtained from diffusion tractography may offer additional information for predicting a subsequent asymmetry in motor function.
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Abbreviations
- AD:
-
Axial diffusivity
- ADC:
-
Apparent diffusion coefficient
- AI:
-
Asymmetry index
- AIS:
-
Arterial ischemic stroke
- CP:
-
Cerebral peduncle
- CST:
-
Corticospinal tract
- DTI:
-
Diffusion tensor imaging
- DWI:
-
Diffusion weighted imaging
- FA:
-
Fractional anisotropy
- HPI:
-
Haemorrhagic parenchymal infarction
- MCA:
-
Middle cerebral artery
- MRI:
-
Magnetic resonance imaging
- PLIC:
-
Posterior limb of the internal capsule
- RD:
-
Radial diffusivity
- SI:
-
Signal intensity
- TE:
-
Echo time
- TEA:
-
Term equivalent age
- TR:
-
Repetition time
- WM:
-
White matter
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Acknowledgements
We thank the Medical Research Council (UK) and Imperial College Healthcare Comprehensive Biomedical Research Centre Funding Scheme.
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Table S1
Patient characteristics. EmCS emergency caesarean section, SVD spontaneous vaginal delivery, PROM prolonged rupture of membranes, IUGR intrauterine growth restriction, HIE hypoxic–ischaemic encephalopathy, GA gestational age, M male, F female, BMI body mass index (DOCX 15 kb)
Table S2
Diffusion characteristics of the corticospinal tracts in infants with lesions and controls. #Indicates that connectivity distributions could not be generated (DOCX 15 kb)
Figure S1A
Asymmetry index for tract volume (a), FA (b), ADC values (c), axial diffusivity (d) and radial diffusivity (e) of the corticospinal tract in newborns with ischaemic lesions and controls. AI asymmetry index. Key: normal controls (diamond), cases with normal motor outcome (square), cases who developed an asymmetry (circle), cases who developed a hemiplegia (cross) (JPEG 7 kb)
Figure S1B
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Figure S1C
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Figure S1D
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Figure S1E
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Roze, E., Harris, P.A., Ball, G. et al. Tractography of the corticospinal tracts in infants with focal perinatal injury: comparison with normal controls and to motor development. Neuroradiology 54, 507–516 (2012). https://doi.org/10.1007/s00234-011-0969-5
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DOI: https://doi.org/10.1007/s00234-011-0969-5