Anatomical, blood oxygenation level-dependent, and blood flow MRI of nonhuman primate (baboon) retina

Yi Zhang, Hsiao Ying Wey, Oscar San Emeterio Nateras, Qi Peng, Bryan H. De La Garza, Timothy Q. Duong

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The goal of this study was to demonstrate high-resolution anatomical, blood oxygenation level-dependent, and blood flow MRI on large nonhuman primate retinas using a 3-Tesla clinical scanner as a first step toward translation. Baboon was chosen because of its evolutionary similarity to human. Anesthetized preparation, free of eye-movement artifacts, was used to evaluate clinical scanner hardware feasibility and optimize multimodal protocols for retinal MRI. Anatomical MRI (0.1 × 0.2 × 2.0 mm 3) before contrast-agent injection detected three alternating bright-dark-bright layers. The hyperintense inner strip nearest to the vitreous was enhanced by an intravascular contrast agent, which likely included the ganglion and bipolar cell layer and the embedded retinal vessels. The hypointense middle strip showed no contrast enhancement, which likely included the avascular outer unclear layer and photoreceptor segments. The hyperintense outer strip showed contrast enhancement, which likely corresponded to the choroid vascular layer. In the posterior retina, the total thickness including the choroid was 617 ± 101 μm (± standard deviation, n = 7). Blood oxygenation level-dependent functional MRI (0.3 × 0.6 × 2.0 mm 3) of oxygen inhalation relative to air increased the signals by 6.5 ± 1.4%. Basal blood flow (2 × 2 × 2 mm 3) was 83 ± 30 mL/100 g/min (air), and hypercapnia increased blood flow by 25 ± 9% (P < 0.05). This study demonstrates multimodal MRI to image anatomy, physiology, and function on large nonhuman primate retinas using a clinical scanner, offering encouraging data to explore human applications.

Original languageEnglish (US)
Pages (from-to)546-554
Number of pages9
JournalMagnetic Resonance in Medicine
Volume66
Issue number2
DOIs
StatePublished - Aug 2011
Externally publishedYes

Fingerprint

Papio
Primates
Retina
Choroid
Contrast Media
Air
Retinal Vessels
Hypercapnia
Eye Movements
Ganglia
Artifacts
Inhalation
Blood Vessels
Anatomy
Magnetic Resonance Imaging
Oxygen
Injections

Keywords

  • blood flow
  • blood oxygenation level-dependent
  • choroid
  • high-resolution fMRI
  • high-resolution MRI
  • hypercapnia
  • hyperoxia
  • retinal diseases

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

Cite this

Anatomical, blood oxygenation level-dependent, and blood flow MRI of nonhuman primate (baboon) retina. / Zhang, Yi; Wey, Hsiao Ying; Nateras, Oscar San Emeterio; Peng, Qi; De La Garza, Bryan H.; Duong, Timothy Q.

In: Magnetic Resonance in Medicine, Vol. 66, No. 2, 08.2011, p. 546-554.

Research output: Contribution to journalArticle

Zhang, Yi ; Wey, Hsiao Ying ; Nateras, Oscar San Emeterio ; Peng, Qi ; De La Garza, Bryan H. ; Duong, Timothy Q. / Anatomical, blood oxygenation level-dependent, and blood flow MRI of nonhuman primate (baboon) retina. In: Magnetic Resonance in Medicine. 2011 ; Vol. 66, No. 2. pp. 546-554.
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