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Area of Science:

  • Neuroscience
  • Space Medicine
  • Medical Imaging

Background:

  • Spaceflight induces significant physiological changes, including brain alterations and fluid shifts.
  • Perivascular spaces (PVSs) are critical for brain fluid homeostasis and waste removal, but their response to spaceflight is unknown.

Purpose of the Study:

  • To investigate the impact of spaceflight on the number and morphology of brain perivascular spaces (PVSs).
  • To explore the role of prior spaceflight experience in modulating PVS changes after missions.

Main Methods:

  • Utilized T1-weighted 3T MRI scans from 15 astronauts before and after ~6-month International Space Station missions.
  • Employed an automated segmentation algorithm to quantify white matter PVS number and morphology, validated against manual ratings.
  • Assessed PVS reliability using intraclass correlation coefficients (ICC).

Main Results:

  • An automated PVS segmentation algorithm demonstrated high reliability and performance comparable to manual assessment.
  • Novice astronauts exhibited a significant increase in total PVS volume post-flight, whereas experienced astronauts did not.
  • Pre-flight PVS load showed a trend towards association with prior flight experience, though not statistically significant.

Conclusions:

  • Perivascular spaces (PVSs) are reliably detectable using T1-weighted MRI and are affected by spaceflight.
  • Prior spaceflight experience appears to be a key factor influencing PVS adaptations and volume changes.
  • These findings highlight the dynamic nature of brain fluid dynamics in astronauts and the potential protective effects of experience.