Needle tip visualization by bevel-point ultrasound generator and prototype photoacoustic imaging system
| Autor: | Dai Murakoshi, Kaku Irisawa, Toshiro Hayakawa, Atsushi Hashimoto, Yamamoto Katsuya |
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| Rok vydání: | 2017 |
| Předmět: |
Photoacoustic effect
Optical fiber Materials science genetic structures Laser diode business.industry Ultrasound 030204 cardiovascular system & hematology Laser Bevel 030218 nuclear medicine & medical imaging Semiconductor laser theory law.invention 03 medical and health sciences 0302 clinical medicine Optics Transducer law business |
| Zdroj: | Photons Plus Ultrasound: Imaging and Sensing 2017. |
| ISSN: | 0277-786X |
| Popis: | Visualization of the tip of medical devices like needles or catheters under ultrasound imaging has been a continuous topic since the early 1980’s. In this study, a needle tip visualization system utilizing photoacoustic effects is proposed. In order to visualize the needle tip, an optical fiber was inserted into a needle. The optical fiber tip is placed on the needle bevel and affixed with black glue. The pulsed laser light from laser diode was transferred to the optical fiber and converted to ultrasound due to laser light absorption of the black glue and the subsequent photoacoustic effect. The ultrasound is detected by transducer array and reconstructed into photoacoustic images in the ultrasound unit. The photoacoustic image is displayed with a superposed ultrasound B-mode image. As a system evaluation, the needle is punctured into bovine meat and the needle tip is observed with commercialized conventional linear transducers or convex transducers. The needle tip is visualized clearly at 7 and 12 cm depths with linear and convex probes, respectively, even with a steep needle puncture angle of around 90 degrees. Laser and acoustic outputs, and thermal rise at the needle tip, were measured and were well below the limits of the safety standards. Compared with existing needle tip visualization technologies, the photoacoustic needle tip visualization system has potential distinguishable features for clinical procedures related with needle puncture and injection. |
| Databáze: | OpenAIRE |
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