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Microradiosurgical cortical transections generated by synchrotron radiation.

Pantaleo Romanelli1, Erminia Fardone2, Domenico Bucci3

  • 1Cyberknife Radiosurgery Center, Centro Diagnostico Italiano, via Saint Bon, 20147 Milano, Italy; AB Medica, 31 via Nerviano, 20020 Lainate, Milano, Italy.

Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)
|June 3, 2015
PubMed
Summary
This summary is machine-generated.

Synchrotron microbeams create precise, low-invasive lesions in rodent visual cortex, mimicking surgical transections with minimal damage to adjacent tissue. This technique offers a novel tool for studying cortical function.

Keywords:
Brain cortexEpilepsyMicrobeamSynchrotron transections

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Area of Science:

  • Neuroscience
  • Radiosurgery
  • X-ray physics

Background:

  • Synchrotron-generated microplanar X-ray beams (microbeams) offer a precise method for creating targeted lesions in biological tissues.
  • These microbeams can mimic the effects of microsurgical subpial transections but with a less invasive approach.

Purpose of the Study:

  • To investigate the feasibility and effects of image-guided atlas-based microbeam cortical transections in the visual brain cortex of rodents.
  • To assess the potential of microbeam radiosurgery as a tool for studying cortical function.

Main Methods:

  • Seven 1-month-old Wistar rats underwent image-guided atlas-based microbeam cortical transections.
  • An array of 10 parallel microbeams (25 microns thick, 200-micron spacing) was delivered to the visual cortex with a 600 Gy incident dose.

Main Results:

  • The procedure was well-tolerated, with rats exhibiting normal behavior, weight gain, and no gross visual impairment post-recovery.
  • Histological examination after 3 months revealed cortical transections consistent with surgical incisions, with notable sparing of adjacent cortical columns.
  • No signs of radionecrosis were observed at the 3-month time point.

Conclusions:

  • Synchrotron-generated microbeams effectively created incision-like neuronal loss in the visual cortex, sparing adjacent columns.
  • Microbeam radiosurgery shows potential as a novel tool for cellular-level investigation of cortical function, warranting further research.