. 465 Downloads. Abstract Although medical specialties have recognized the importance of using ultrasonic imaging, dentistry is only beginning to discover its benefit. This has particularly been important in the field of periodontics which studies infections in the gum and bone tissues that surround the teeth. This study investigates the feasibility of using a custom-designed high-frequency ultrasound imaging system to reconstruct high-resolution (.
Ahmed M. Mahmoud. 1. 2. Peter Ngan. 3. Richard Crout. 4.
Facilities and Equipment Please check the detailed description in the following link. Parametrics 5900PR 200MHz computer controlled pulser/receiver and ultrasonic transducers. OKOS ODIS data collection and processing software QMI Sonda 007 air-coupled UT Olympus Omniscan SX Olympus RollerForm Phased array AOS-NDT pahsed array AOS-64. With improved sensitivity, objectivity and accuracy compared to manual palpation. The different. The resulting signal is amplified (5900PR, Olympus-NDT.
Osama M. Mukdadi. 1. 5. 1.
Department of Mechanical and Aerospace Engineering West Virginia University Morgantown USA. 2. Department of Biomedical Engineering Cairo University Giza Egypt.
3. Department of Orthodontics West Virginia University Morgantown USA.
4. Department of Periodontics West Virginia University Morgantown USA. 5. Center for Cardiovascular and Respiratory Sciences West Virginia University Morgantown USA About this article.
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Abstract In this paper a new generation of optical-resolution photoacoustic microscopy (OR-PAM) with a wide range of potential clinical applications is demonstrated. Using fast scanning mirrors, an image guide with 30,000 fiber pixels, a refocusing lens and a unique probe we managed to reduce the footprint of an OR-PAM system from a stationary table-top system to a portable, 4cm by 6cm, probe weighing 500g tethered to a scanning unit. The phantom studies show that the handheld optical-resolution photoacoustic microscope is able to image with 7μm resolution. For in vivo studies images of the microvasculature in a Swiss Webster mouse ear are shown.
The compact, flexible nature of the proposed design and the small footprint of the apparatus increase the usability of OR-PAM for potential clinical applications such as in dermatology. ©2011 Optical Society of America OSA Recommended Articles. References. View by:. Article Order.
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Zemp, “Optical-resolution photoacoustic micro-endoscopy using image-guide fibers and fiber laser technology,” Proc. SPIE 7899, 78990P, 78990P-6 (2011). Ranasinghesagara, L. Fedosejevs, “Optical resolution photoacoustic microscopy using novel high-repetition-rate passively Q-switched microchip and fiber lasers,” J. Opt. 15(5), 056017 (2010). Ranasinghesagara, Y.
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Ranasinghesagara, Y. Mathewson, and R. Zemp, “Photoacoustic technique for assessing optical scattering properties of turbid media,” J. Opt. 14(4), 040504 (2009). Ranasinghesagara, L.
Fedosejevs, “Optical resolution photoacoustic microscopy using novel high-repetition-rate passively Q-switched microchip and fiber lasers,” J. Opt. 15(5), 056017 (2010).
1 (a) Experimental setup of our HH-OR-PAM imaging system employing a high repetition rate diode- pumped pulsed Ytterbium fiber laser with up to 600 kHz pulse repetition rate and pulse widths of 1ns. FLD: fiber laser driver, Yb: Ytterbium, M: mirror, Gs: glass, PD: Photodiode, FG1: function generator channel 1, FG2: function generator channel 2, DX: X axis mirror driver, DY: Y axis mirror driver, OL: objective lens, A: amplifier (Olympus 5900PR). (b) The structure of the handheld probe.
The light at the end of the fiber is refocused using a pair of glass aspheric lenses with 350 to 700nm AR Coating. Then the light passes through an oblique 10-mm fused silica prism. The photoacoustic signals directed upward to the prism’s diagonal will be deflected to a focused transducer (f = 19mm).
AL: glass aspheric lenses, UST: ultrasound transducer, P: prism, IMF: index-matching fluid. (c) The prototype of the handheld probe. AL: glass aspheric lenses, UST: ultrasound transducer, P: prism, IMF: index-matching fluid.