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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Tae-Hoon Bok Hysi, E. Kolios, M.C. |
| Copyright Year | 2014 |
| Description | Author affiliation: Dept. of Phys., Ryerson Univ., Toronto, ON, Canada (Tae-Hoon Bok; Hysi, E.; Kolios, M.C.) |
| Abstract | In this paper, high-frequency photoacoustic (PA) imaging is proposed to simultaneously measure erythrocyte aggregation (EA) and oxygen saturation $(SO_{2}).$ EA is a reversible phenomenon where red blood cells aggregate under flowing conditions and it becomes pathological when enhanced in a number of circulatory disorders. Here we investigate the feasibility of PA imaging in detecting EA-induced changes in $SO_{2}$ in a simulated circulatory flow system. For all optical wavelengths of illumination (750 and 850 nm), the mean PA amplitude inside the region of interest cyclically varied at intervals corresponding to the beat rate (30, 60, and 90 bpm). The vessel diameter also cyclically varied at the same time interval, but the phase of its variation was reversed compared to the PA amplitude variations. This was expected: as the blood velocity decreased, the shear rate in the radial direction also decreased, resulting in increased EA thus enhancing the PA amplitude due to the increased effective absorber size. When the velocity is increased, the aforementioned process is reversed, resulting in decreased EA and PA amplitude. The cyclic variation in $SO_{2}$ was evident for the highest beat rate, and differences in the mean PA amplitude at 750 and 850 nm were detected for all beat rates. This indicates that the $SO_{2}$ was varying while blood was flowing with the different beat rates. The temporal variation in $SO_{2}$ can be correlated to EA, since it has been reported that oxygen release is inhibited by EA. |
| Starting Page | 1292 |
| Ending Page | 1295 |
| File Size | 1569091 |
| Page Count | 4 |
| File Format | |
| e-ISBN | 9781479970490 |
| DOI | 10.1109/ULTSYM.2014.0319 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2014-09-03 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Blood Blood flow Ultrasonic imaging Optical imaging Optical saturation Acoustics pulsatile blood flow erythrocyte aggregation oxygen saturation high-frequency photoacoustics |
| Content Type | Text |
| Resource Type | Article |
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