title: Spatial frequency-based analysis of mean red blood cell speed in single microvessels: investigation of microvascular perfusion in rat cerebral cortex.
abstract: BACKGROUND
  Our previous study has shown that prenatal exposure to X-ray irradiation causes cerebral hypo-perfusion during the postnatal development of central nervous system (CNS). However, the source of the hypo-perfusion and its impact on the CNS development remains unclear. The present study developed an automatic analysis method to determine the mean red blood cell (RBC) speed through single microvessels imaged with two-photon microscopy in the cerebral cortex of rats prenatally exposed to X-ray irradiation (1.5 Gy).
  
  
  RESULTS
  We obtained a mean RBC speed (0.9±0.6 mm/sec) that ranged from 0.2 to 4.4 mm/sec from 121 vessels in the radiation-exposed rats, which was about 40% lower than that of normal rats that were not exposed. These results were then compared with the conventional method for monitoring microvascular perfusion using the arteriovenous transit time (AVTT) determined by tracking fluorescent markers. A significant increase in the AVTT was observed in the exposed rats (1.9±0.6 sec) as compared to the age-matched non-exposed rats (1.2±0.3 sec). The results indicate that parenchyma capillary blood velocity in the exposed rats was approximately 37% lower than in non-exposed rats.
  
  
  CONCLUSIONS
  The algorithm presented is simple and robust relative to monitoring individual RBC speeds, which is superior in terms of noise tolerance and computation time. The demonstrative results show that the method developed in this study for determining the mean RBC speed in the spatial frequency domain was consistent with the conventional transit time method.
authors: Department of Biophysics, Molecular Imaging Center, National Institute of Radiological Sciences, Anagawa, Chiba, Japan.
authors: Joonas
authors: J
authors: Autio
authors: Hiroshi
authors: H
authors: Kawaguchi
authors: Shigeyoshi
authors: S
authors: Saito
authors: Ichio
authors: I
authors: Aoki
authors: Takayuki
authors: T
authors: Obata
authors: Kazuto
authors: K
authors: Masamoto
authors: Iwao
authors: I
authors: Kanno
mesh_terms: D000465:Algorithms; D000818:Animals; D001776:Blood Circulation Time / Q000379:methods*; D001783:Blood Flow Velocity / Q000528:radiation effects*; D002540:Cerebral Cortex / Q000098:blood supply*; D004912:Erythrocytes / Q000166:cytology / Q000502:physiology*; D008722:Methods; D008853:Microscopy; D055806:Microvessels / Q000502:physiology / Q000528:radiation effects*; D051381:Rats; D014965:X-Rays / Q000009:adverse effects*