OPTICAL STRESS DETECTION SYSTEM FOR FORWARD-MODE OF PHOTOACOUSTIC IMAGING

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AHMADIAN A.; HEJAZI M.; ABOU ALHASANI MOHAMMAD JAVAD; FRENZ M.; NIEDERHAUSER J.J.; JAEGER M.; AMJADI A.

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Journal: IRANIAN JOURNAL OF MEDICAL PHYSICS Year:2005 | Volume:2 | Issue:6 Page(s): 3-12

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Title

OPTICAL STRESS DETECTION SYSTEM FOR FORWARD-MODE OF PHOTOACOUSTIC IMAGING

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Keywords

PHOTOACOUSTIC IMAGINGQ4

OPTICAL STRESS DETECTION SYSTEMQ4

FABRY PEROT DETECTION SYSTEMQ4

SIGNAL TO NOISE RATIOQ4

NOISE EQUIVALENT PRESSUREQ3

SENSITIVITYQ3

Abstract

Introduction: Pulsed PHOTOACOUSTIC IMAGING with wideband medical application is a technique in which the absorption of optieal pulse in chromophores produces ultrasonic thermoelastic waves. The waves are detected by an ultrasonic transducer at the surface of the tissue. The transducer with adequate resolution and acoustic SENSITIVITY provides molecular imaging of superficial tissue structures such as the microvessels and skin. In this article, the SENSITIVITY of the optical detection systems were measured in comparison with that of the calibrated hydrophone under the same experimental conditions. Material and Methods: A continuous Nd: YAG laser, a pulsed Nd: YAG laser, an OPTICAL STRESS DETECTION SYSTEM, a FABRY PEROT DETECTION SYSTEM, a needle hydrophone, a fast-photodiode and a 500 MHz digital oscilloscope were used. Laser pulses (energy = 10 mJ, pulsewidth = 6 ns) were delivered via an optical fiber (600 mm) into an aqueous solution of Indocyanine Green (ICG). The pulses absorbed in the solution, and then acoustic waves produced and received by ultrasonic transducer at the surface of the tissue. The other side of the transducer was illuminated by the continuous laser at the wavelength of 532 nm .The modulated optical beam was detected by the photodiode and the digital oscilloscope. Therefore, a photoacoustic signal was observed as a bipolar signal on the oscilloscope monitor.The SENSITIVITY of the of the optical stress transducer was measured in comparison with a FABRY PEROT DETECTION SYSTEM and a needle hydrophone by measuring a SIGNAL TO NOISE RATIO (SNR) and a NOISE EQUIVALENT PRESSUREs (NEP).Results: The SNR of hydrophone, optical stress transducer and Fabry Perot were 56dB, 45 dB and 26 dB respectively. NEP of hydrophone, FABRY PEROT DETECTION SYSTEM and OPTICAL STRESS DETECTION SYSTEM were 11 kPa, 13 kPa and 15 kPa, respectively. So NEP of Fabry Perot was 2 kPa higher than that of the OPTICAL STRESS DETECTION SYSTEM.Discussion: NEP of Fabry Perot is higher that of the OPTICAL STRESS DETECTION SYSTEM. Because the bandwidth of the Fabry Perot was 8 MHz higher than that of the optical stresses detection system. Conclusion: The combination of high SENSITIVITY and the small active area makes the optical stress system particularly suitable for PHOTOACOUSTIC IMAGING applications.

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APA: Copy

AHMADIAN, A., HEJAZI, M., ABOU ALHASANI, MOHAMMAD JAVAD, FRENZ, M., NIEDERHAUSER, J.J., JAEGER, M., & AMJADI, A.. (2005). OPTICAL STRESS DETECTION SYSTEM FOR FORWARD-MODE OF PHOTOACOUSTIC IMAGING. IRANIAN JOURNAL OF MEDICAL PHYSICS, 2(6), 3-12. SID. https://sid.ir/paper/96910/en

Vancouver: Copy

AHMADIAN A., HEJAZI M., ABOU ALHASANI MOHAMMAD JAVAD, FRENZ M., NIEDERHAUSER J.J., JAEGER M., AMJADI A.. OPTICAL STRESS DETECTION SYSTEM FOR FORWARD-MODE OF PHOTOACOUSTIC IMAGING. IRANIAN JOURNAL OF MEDICAL PHYSICS[Internet]. 2005;2(6):3-12. Available from: https://sid.ir/paper/96910/en

IEEE: Copy

A. AHMADIAN, M. HEJAZI, MOHAMMAD JAVAD ABOU ALHASANI, M. FRENZ, J.J. NIEDERHAUSER, M. JAEGER, and A. AMJADI, “OPTICAL STRESS DETECTION SYSTEM FOR FORWARD-MODE OF PHOTOACOUSTIC IMAGING,” IRANIAN JOURNAL OF MEDICAL PHYSICS, vol. 2, no. 6, pp. 3–12, 2005, [Online]. Available: https://sid.ir/paper/96910/en

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