Dr. Siridech Boonsang, à¸à¸£. à¸¨à¸´à¸£à¸´à¹ à¸à¸ à¸à¸¸à¸ à¹à¸ªà¸ - Nectec

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Mechanism of photoacoustic generation ! Dielectric breakdown (Laser intensities >10 10 W.cm -2 ) ! Vaporization (conversion efficiency 1%) ! Material ablation ! Thermoelastic process ! Electrostriction ! Irradiation pressure
Thermoelastic process ns – µs Pulse duration Ultrasound Laser irradiation Z Irradiated volume Tissue ∇ φ − 2 1 c 2 L 2 ∂ φ = 2 ∂t * αβ ρc p I o e −αz H () r f () t Wave equation
Page 1 and 2: Photon Sensing and Imaging Laborato
Page 3 and 4: Photo-Acoustic Tomography
Page 5 and 6: Historical milestones ! E.G. Bell f
Page 7: Potential applications ! Intra-arte
Page 13 and 14: Laser ultrasound system
Page 15 and 16: Examination of human aorta Normal a
Page 17 and 18: Outline diagram of bovine eye toget
Page 19 and 20: Laser ultrasound system Nd:YAG Lase
Page 21 and 22: Electromagnetic acoustic transducer
Page 24 and 25: Without blood vessel With blood ves
Page 26: Laser ultrasound system : UMIST 600
Page 30: Laser ultrasound system : Texas A&M
Page 35 and 36: Acousto-Optic tomography
Page 39 and 40: Levequet-Fort et al. 2001
Page 41: Acknowledgements ! Professor Richar

Dr. Siridech Boonsang, à¸à¸£. à¸¨à¸´à¸£à¸´à¹ à¸à¸ à¸à¸¸à¸ à¹à¸ªà¸ - Nectec

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Dr. Siridech Boonsang, à¸à¸£. à¸¨à¸´à¸£à¸´à¹ à¸à¸ à¸à¸¸à¸ à¹à¸ªà¸ - Nectec