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Imaging cadavers: cold FLAIR and noninvasive brain thermometry using CSF diffusion.

Paul S Tofts1, Jonathan S Jackson, Daniel J Tozer

  • 1Institute of Neurology, Queen Square, University College London, UK. p.s.tofts@bsms.ac.uk

Magnetic Resonance in Medicine
|December 7, 2007
PubMed
Summary
This summary is machine-generated.

Researchers developed a method using cerebrospinal fluid (CSF) diffusion coefficients (DC) to accurately measure brain temperature in cadavers. This allows for optimized FLAIR imaging in noninvasive autopsies, improving research and comparisons with in vivo studies.

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Area of Science:

  • Medical Imaging
  • Forensic Science
  • Biophysics

Background:

  • Cadaver imaging for noninvasive autopsies is gaining interest for research.
  • Low temperatures in cadavers cause 'cold brain' effects, altering conventional imaging like FLAIR.
  • Conventional FLAIR sequences fail to produce dark cerebrospinal fluid (CSF) at low temperatures due to reduced T(1) and diffusion coefficients (DC).

Purpose of the Study:

  • To investigate 'cold brain' effects on imaging parameters in cadavers.
  • To establish a method for accurately measuring brain core temperature in cadavers using diffusion coefficients.
  • To optimize FLAIR imaging sequences for cadaveric brain analysis.

Main Methods:

  • Measured CSF diffusion coefficients (DC) and T(1) relaxation times in cadavers at low temperatures.
  • Correlated CSF DC values with brain core temperatures using external thermocouple measurements.
  • Developed and tested a modified FLAIR sequence (Cold FLAIR) with optimized inversion time (TI(0)) for dark CSF at low temperatures.

Main Results:

  • CSF DC values were significantly reduced at low temperatures (1.1-1.5 x 10(-9) m(2)s(-1) at 1-10°C).
  • CSF DC measurements accurately predicted brain core temperatures within 1.0°C.
  • The Cold FLAIR sequence successfully produced dark CSF at 10°C with an optimized TI(0) of 1.5 sec.

Conclusions:

  • CSF diffusion coefficients serve as a reliable noninvasive thermometer for cadaveric brains.
  • Optimized FLAIR imaging (Cold FLAIR) enhances the value of cadaveric brain imaging for research and comparison with in vivo studies.
  • This method improves the utility of noninvasive autopsies and facilitates cross-study comparisons.