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Automatic volumetry of cerebrospinal fluid and brain volume in severe paediatric hydrocephalus, implementation and clinical course after intervention

  • Original Article - Pediatric Neurosurgery
  • Published:
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Abstract

Background

In childhood hydrocephalus, both the amount of cerebrospinal fluid and the brain volume are relevant for the prognosis of the development and for therapy monitoring. Since classical planar measurements of ventricular size are subject to strong limitations, imprecise and neglect brain volume, 3D volumetry is most desirable. We used and evaluated the robust segmentation algorithms of the freely available FSL-toolbox in paediatric hydrocephalus patients before and after specific therapy.

Methods

Retrospectively 76 pre- and postoperative high-resolution T2-weighted MRI sequences (true FISP, 1 mm isovoxel) were analyzed in 38 patients with paediatric hydrocephalus (mean 4.4 ± 5.1 years) who underwent surgical treatment (ventriculo-peritoneal (VP) shunt n = 22, endoscopic third ventriculostomy (ETV) n = 16). After preprocessing, the 3D-datasets were skull stripped to estimate the inner skull surface. Following, a 2 class segmentation into different tissue types (brain matter and CSF) was performed. The volumes of CSF and brain were calculated.

Results

The method could be implemented in an automated fashion in all 76 MRIs. In the VP shunt cohort, the amount of CSF (p < 0.001) decreased. Consecutively brain volume increased significantly (p < 0.001). Following ETV, CSF volume (p = 0.019) decreased significantly (p = 0.012) although the reduction was less pronounced than after shunt implantation. Brain volume expanded (p = 0.02).

Conclusion

A reliable automated segmentation of CSF and brain could be performed with the implemented algorithm. The method was able to track changes after therapy and detected significant differences in CSF and brain volumes after shunting and after ETV.

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Abbreviations

CSF:

Cerebrospinal fluid

VP shunt:

Ventriculo-peritoneal shunt

ETV:

Endoscopic third ventriculostomy

MRI:

Magnet resonance imaging

VBrain:

Brain volume

VCSF:

CSF volume

ICV:

Intracranial volume

FSL:

Functional Magnetic Resonance Imaging of the Brain Software Library

BET:

Brain extraction tool

FAST:

FMRIB’s Automated Segmentation Tool

true FISP:

True fast imaging with steady-state precession

SD:

Standard deviation

FOHR:

Frontal occipital horn ratio

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Authors

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Correspondence to Isabel Gugel.

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Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee (University Hospital Tübingen, Germany) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. For this type of study, formal consent is not required.

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Comments

In order to assess CSF spaces in hydrocephalic patients, modern imaging techniques may add significant information, e.g. in follow up after treatment, but also in respect of investigating functional outcome correlated with changes of brain structures and CSF spaces. The authors are presenting one example of these innovative techniques.

Angela-Martina Messing-Junger

Bonn, Germany

The authors review a population of children with hydrocephalus (n = 76) and use segmentation algorithms obtained from freely available online software to measure brain and ventricular volume before and after insertion of a ventriculoperitoneal shunt (n = 22) or endoscopic third ventriculostomy (n = 16). They conclude that the software confirmed a reduction in ventricular size and an increase in brain volume, and argue that this technique is potentially more objective than measurement of traditional parameters of ventricular size, such as Evans ratio or frontal occipital horn ratio, in the diagnosis of hydrocephalus and its response to treatment. The authors describe their methods well, and explain clearly which MRI sequences they have used. They discuss the benefits of the software they have chosen; it is free, easily available and, unlike many others, appears less labour intensive. They argue that accurate ventricular and brain volume measurement is an important pre-requisite to a deeper understanding of the correlation between ventricular and brain size with cognitive development. This is an important study, and, as neurosurgery and neuroradiology progress towards more accurate and more automated evaluation of ventricular and brain volume, it becomes particularly relevant.

Kristian Aquilina

London, UK

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Grimm, F., Edl, F., Gugel, I. et al. Automatic volumetry of cerebrospinal fluid and brain volume in severe paediatric hydrocephalus, implementation and clinical course after intervention. Acta Neurochir 162, 23–30 (2020). https://doi.org/10.1007/s00701-019-04143-5

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  • DOI: https://doi.org/10.1007/s00701-019-04143-5

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