| Project/Area Number |
08458289
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Biomedical engineering/Biological material science
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| Research Institution | Kagawa Medical University |
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Principal Investigator |
SENDA Shoichi Kagawa Medical University, Fuculty of Medicine, associate Professor, 医学部・付属病院, 助教授 (30145049)
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| Co-Investigator(Kenkyū-buntansha) |
NISHIMURA Toshihiro Oita university, Fuculty of Engineering, research associate, 工学部, 助手 (70117406)
MASUGATA Hisashi Kagawa Medical University, University Hospital, research associate, 医学部・付属病院, 助手 (70263910)
MIZUSHIGE Katsufumi Kagawa Medical University, Fuculty of Medicine, assistant Professor, 医学部, 講師 (90166009)
SAKAMOTO Haruhiko Kagawa Medical University, Fuculty of Medicine, Professor, 医学部, 教授 (60106549)
MATSUO Hirohide Kagawa Medical University, Fuculty of Medicine, Professor, 医学部, 教授 (90028514)
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| Project Period (FY) |
1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥6,600,000 (Direct Cost: ¥6,600,000)
Fiscal Year 1996: ¥6,600,000 (Direct Cost: ¥6,600,000)
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| Keywords | acoustic microscope / atherosclerosis / endothel / propagation sound speed / acoustic property |
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| Research Abstract |
purpose : This study was executed to evaluate the acoustic propagation speed of live human endothel cell and aortic smooth muscle cell using scanning acoustic microscopy (SAM).
method and material : We depicted the C mode and X-Z mode images of endothel with 100 MHz, 450 MHz and 600 MHz ultrasound. The propagation speed was able to be calculated from the location of the fringe on the C mode image and the fringe shift on the X-Z mode image taken with 450 MHz ultrasound from the formula V_S=V_M+2f DELTAz (V_S : propagation sound speed of the sample, V_M : propagation sound speed of the medium, f : frequency, DELTAz : fringe shift on X-Z mode image). The propagation sound speed of aortic smooth muscle cells in groups : growing (group G), differential (D) and on hypotonic loading (H), were evaluated with SAM.
result : C mode image of endothel was obtained clearly with intracellular granules detectable at 450 MHz frequency using saline as the coupling fluid. Intracellular granules were observed at 450 MHz, and 600 MHz but not at 100 MHz. The upward Z scanning images of the cell had two or three black and white contrast rings. Hypotonic loading produced a significant increase in the number of contrast rings observed.
The propagation speed of D (1624(]SY.+-。[)16m/sec) is significantly higher than that of G (1571(]SY.+-。[)14m/sec) and H (1585(]SY.+-。[)8m/sec). SAM should be considered a useful method for studying live cell acoustic properties.
Conclusion : The propagation sound speed was calculated even when the sample thickness is unknown, monitoring only the pulse amplitude change during X-Z scanning. The scanned image exhibits features related to the cell surface curvature and attenuation. Scanning acoustic microscopy should be considered a useful method for studying live cell acoustic properties.
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