Functional transcranial photoacoustic micro-imaging of mouse cerebrovascular cross-section and hemoglobin oxygenation changes during forepaw electrical stimulation

Lun-De Liao; You-Yin Chen; Chin-Teng Lin; Jyh-Yeong Chang; Meng-Lin Li

doi:10.1117/12.874449

18 February 2011 Functional transcranial photoacoustic micro-imaging of mouse cerebrovascular cross-section and hemoglobin oxygenation changes during forepaw electrical stimulation

Lun-De Liao, You-Yin Chen, Chin-Teng Lin, Jyh-Yeong Chang, Meng-Lin Li

Author Affiliations +

Proceedings Volume 7899, Photons Plus Ultrasound: Imaging and Sensing 2011; 78992X (2011) https://doi.org/10.1117/12.874449
Event: SPIE BiOS, 2011, San Francisco, California, United States

Abstract

In this study, we report on using a 50-MHz functional photoacoustic microscopy (PAM) to transcranially image the cross-section and hemoglobin oxygenation (SO₂) changes of single mouse cortical vessels in response to left forepaw electrical stimulation. Three difference levels of the cortical vessels (i.e., with different-sized diameters of 350, 100 and 55 μm) on activated regions were marked to measure their functional cross-section and SO₂ changes as a function of time. Electrical stimulation of the mouse left forelimb was applied to evoke functional changes in vascular dynamics of the mouse somatosensory cortex. The applied current pulses were with a pulse frequency of 3 Hz, pulse duration of 0.2 ms, and pulse amplitude of 2 mA. The cerebrovascular cross-section changes, which indicate changes in cerebral blood volume (CBV), were probed by images acquired at 570 nm, a hemoglobin isosbestic point, while SO₂ changes were monitored by the derivatives of 560-nm images normalized to 570-nm ones. The results show that vessel diameter and SO₂ were significantly dilated and increased when compared with those of the controlled ones. In summary, the PAM shows its promise as a new imaging modality for transcranially functional quantification of single vessel diameter (i.e., CBV) and SO₂ changes without any contrast agents applied during stimulation.

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Lun-De Liao, You-Yin Chen, Chin-Teng Lin, Jyh-Yeong Chang, and Meng-Lin Li "Functional transcranial photoacoustic micro-imaging of mouse cerebrovascular cross-section and hemoglobin oxygenation changes during forepaw electrical stimulation", Proc. SPIE 7899, Photons Plus Ultrasound: Imaging and Sensing 2011, 78992X (18 February 2011); https://doi.org/10.1117/12.874449

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