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We propose a method for estimating the shape of an ultrasonic flexible probe, which can be utilized in ultrasound imaging for medical applications. Flexible ultrasound probes are required to visualize hard and curved parts; further, they are expected to visualize soft parts while maintaining their shape. This paper presents the proposed method for obtaining a suitable probe shape by estimating the coordinates of all elements. The ultrasonic direct waves obtained by the deformed probe were used to estimate the shape of the probe. As a result, the mean absolute and maximum errors were confirmed to be 0.29 mm and 0.55 mm, respectively, using a probe with a pitch of 162 mm and a frequency of 4.625 MHz.
Miki Sada; Masayuki Tanabe. Preliminary study of self-shape estimation of ultrasonic flexible probe using direct waves among elements for medical ultrasound imaging. Japanese Journal of Applied Physics 2020, 59, SKKE25 .
AMA StyleMiki Sada, Masayuki Tanabe. Preliminary study of self-shape estimation of ultrasonic flexible probe using direct waves among elements for medical ultrasound imaging. Japanese Journal of Applied Physics. 2020; 59 (SK):SKKE25.
Chicago/Turabian StyleMiki Sada; Masayuki Tanabe. 2020. "Preliminary study of self-shape estimation of ultrasonic flexible probe using direct waves among elements for medical ultrasound imaging." Japanese Journal of Applied Physics 59, no. SK: SKKE25.
We have newly developed coaxial and confocal optical-resolution photoacoustic microscopy based on sol-gel composite materials. This transducer contains a concave-shaped piezoelectric layer with a focus depth of 5 mm and a hole with a diameter of 3 mm at the center to pass a laser beam into a phantom. Therefore, this system can directly detect an excited photoacoustic signal without prisms or acoustic lenses. We demonstrate the capability of the system through pulse-echo and photoacoustic imaging experiments. The center frequency of the fabricated transducer is approximately 7 MHz, and its relative bandwidth is 86%. An ex-vivo experiment is conducted, and photoacoustic signals are clearly obtained. As a result, 2- and 3-dimensional maximum amplitude projection images are reconstructed.
Masayuki Tanabe; Tai Chieh Wu; Makiko Kobayashi; Che Hua Yang. Fabrication of Coaxial and Confocal Transducer Based on Sol-Gel Composite Material for Optical Resolution Photoacoustic Microscopy. Diagnostics 2019, 10, 6 .
AMA StyleMasayuki Tanabe, Tai Chieh Wu, Makiko Kobayashi, Che Hua Yang. Fabrication of Coaxial and Confocal Transducer Based on Sol-Gel Composite Material for Optical Resolution Photoacoustic Microscopy. Diagnostics. 2019; 10 (1):6.
Chicago/Turabian StyleMasayuki Tanabe; Tai Chieh Wu; Makiko Kobayashi; Che Hua Yang. 2019. "Fabrication of Coaxial and Confocal Transducer Based on Sol-Gel Composite Material for Optical Resolution Photoacoustic Microscopy." Diagnostics 10, no. 1: 6.
In this paper, we propose a novel method to form a robot skin sensor by a piezoelectric material spraying technique. By spraying piezoelectric material, the robot skin sensor can be fabricated on a robot with 3D free form. Our fabrication method is based on the sol-gel spraying technique and we improve it for fabricating a larger and more uniform piezoelectric film with reproducibility. We conducted experiments to evaluate the film fabrication quality and the prototype sensor's characteristics. According to the results, the film fabricated by the proposed method has enough thickness uniformity on 100 [mm] square plane. Additionally, the prototype sensor responses well to the applied force and its sensitivity is 25 [mV/N] with the bandwidth of 1 [kHz].
Sho Kimura; Kei Nakatsuma; Yasutaka Ohshima; Masayuki Tanabe; Makiko Kobayashi; Ippei Torigoe. Fabrication and Evaluation of an Uniform Piezoelectric Film for a Robot Skin Sensor. 2018 IEEE Sensors Applications Symposium (SAS) 2018, 1 -4.
AMA StyleSho Kimura, Kei Nakatsuma, Yasutaka Ohshima, Masayuki Tanabe, Makiko Kobayashi, Ippei Torigoe. Fabrication and Evaluation of an Uniform Piezoelectric Film for a Robot Skin Sensor. 2018 IEEE Sensors Applications Symposium (SAS). 2018; ():1-4.
Chicago/Turabian StyleSho Kimura; Kei Nakatsuma; Yasutaka Ohshima; Masayuki Tanabe; Makiko Kobayashi; Ippei Torigoe. 2018. "Fabrication and Evaluation of an Uniform Piezoelectric Film for a Robot Skin Sensor." 2018 IEEE Sensors Applications Symposium (SAS) , no. : 1-4.
In this paper, we propose a novel method to form a robot skin sensor by a piezoelectric material spraying technique. By spraying piezoelectric material and a pattern of electrodes, the robot skin is fabricated on a robot with 3D free form. We describe our method briefly, then report our piezoelectric film production method and a circuit was created to remove electrical noise, the frequency characteristics and the voltage sensitivity of the sensor fabricated on the plane were investigated. According to the results, we found that the sensor we proposed has performance that works well as tactile sensor.
Sho Kimura; Kei Nakatsuma; Masayuki Tanabe; Makiko Kobayashi; Ippei Torigoe. Output characteristics of piezoelectric sensor by a sol-gel spray technique. The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2018, 2018, 1A1 -I17.
AMA StyleSho Kimura, Kei Nakatsuma, Masayuki Tanabe, Makiko Kobayashi, Ippei Torigoe. Output characteristics of piezoelectric sensor by a sol-gel spray technique. The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec). 2018; 2018 ():1A1-I17.
Chicago/Turabian StyleSho Kimura; Kei Nakatsuma; Masayuki Tanabe; Makiko Kobayashi; Ippei Torigoe. 2018. "Output characteristics of piezoelectric sensor by a sol-gel spray technique." The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2018, no. : 1A1-I17.
In the ultrasonic phased array, currently used, the size of the independent vibration element is fixed and the arrangement density is not free. The shape of the phased array is also restricted by the size of it. We have the concept of covering the whole substrate with spray coating of piezoelectric material and applying it to non-contact ultrasonic measurement and manipulation by setting it as an ultrasonic transmitting and receiving point anywhere on the surface of the base material. We aim to fabricate a sheet-like ultrasonic phased array on a large area or curved surface. In this paper, we describe the evaluation results of piezoelectric film coating on curved surface using sol-gel spray method with multi-axis drive apparatus.
Takashi Uchida; Kei Nakatsuma; Masayuki Tanabe; Makiko Kobayashi; Ippei Torigoe. Piezoelectric film coating on free-form surface by multi-axis drive. The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2018, 2018, 1P2 -K18.
AMA StyleTakashi Uchida, Kei Nakatsuma, Masayuki Tanabe, Makiko Kobayashi, Ippei Torigoe. Piezoelectric film coating on free-form surface by multi-axis drive. The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec). 2018; 2018 ():1P2-K18.
Chicago/Turabian StyleTakashi Uchida; Kei Nakatsuma; Masayuki Tanabe; Makiko Kobayashi; Ippei Torigoe. 2018. "Piezoelectric film coating on free-form surface by multi-axis drive." The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2018, no. : 1P2-K18.
In this study, a flexible ultrasonic transducer (FUT) was applied in a laser ultrasonic technique (LUT) for non-destructive characterization of metallic pipes at high temperatures of up to 176 °C. Compared with normal ultrasound transducers, a FUT is a piezoelectric film made of a PZT/PZT sol-gel composite which has advantages due to its high sensitivity, curved surface adaptability and high temperature durability. By operating a pulsed laser in B-scan mode along with the integration of FUT and LUT, a multi-mode dispersion spectrum of a stainless steel pipe at high temperature can be measured. In addition, dynamic wave propagation behaviors are experimentally visualized with two dimensional scanning. The images directly interpret the reflections from the interior defects and also can locate their positions. This hybrid technique shows great potential for non-destructive evaluation of structures with complex geometry, especially in high temperature environments.
Tai Chieh Wu; Makiko Kobayashi; Masayuki Tanabe; Che Hua Yang. The Use of Flexible Ultrasound Transducers for the Detection of Laser-Induced Guided Waves on Curved Surfaces at Elevated Temperatures. Sensors 2017, 17, 1285 .
AMA StyleTai Chieh Wu, Makiko Kobayashi, Masayuki Tanabe, Che Hua Yang. The Use of Flexible Ultrasound Transducers for the Detection of Laser-Induced Guided Waves on Curved Surfaces at Elevated Temperatures. Sensors. 2017; 17 (6):1285.
Chicago/Turabian StyleTai Chieh Wu; Makiko Kobayashi; Masayuki Tanabe; Che Hua Yang. 2017. "The Use of Flexible Ultrasound Transducers for the Detection of Laser-Induced Guided Waves on Curved Surfaces at Elevated Temperatures." Sensors 17, no. 6: 1285.
We have developed a kerfless phased array transducer using sol-gel composite spraying technique. This technique is a method for developing piezoelectric transducer by spraying composite material of piezoelectric sol-gel solution and powder, and it has attracted great attention especially in non-destructive testing over the years because of its features such as curved surface suitability, flexibility, and high-temperature durability. The porosity can contribute to a decrease in crosstalk among elements. As a preliminary experiment, a kerfless linear array transducer with a center frequency of 5 MHz and pitch of 500e-6 m using the sol-gel composite spraying technique was fabricated and fundamental performance was evaluated. As a result, approximately -130 dB of crosstalk was obtained.
Masayuki Tanabe; Makiko Kobayashi; Kei Nakatsuma; Masahiko Nishimoto. Evaluation of kerfless phased array using sol-gel composite spraying technique. Proceedings of Meetings on Acoustics 2017, 32, 020012 .
AMA StyleMasayuki Tanabe, Makiko Kobayashi, Kei Nakatsuma, Masahiko Nishimoto. Evaluation of kerfless phased array using sol-gel composite spraying technique. Proceedings of Meetings on Acoustics. 2017; 32 (1):020012.
Chicago/Turabian StyleMasayuki Tanabe; Makiko Kobayashi; Kei Nakatsuma; Masahiko Nishimoto. 2017. "Evaluation of kerfless phased array using sol-gel composite spraying technique." Proceedings of Meetings on Acoustics 32, no. 1: 020012.
Photoacoustic (PA) imaging employs a pulsed laser to generate acoustic waves to be detected with a piezoelectric transducer. A coaxial, or even confocal, optical-acoustic arrangement has been desired to achieve high resolution and high sensitivity PA imaging. This research reports several designs and fabrications of sol-gel based PZT/PZT single-element transducers for coaxial PA imaging. At first, a planar transducer is fabricated by a sol-gel spray method on a 0.5 mm thick stainless steel substrate with a hole of 3 mm in diameter. Using the planar transducer, in-vitro experiments is conducted, in which pulsed laser with a wavelength of 1053 nm and an energy of 1.15 mJ is used to generate the PA signal. Secondly, a focused transducer, which center frequency is approximately 5 MHz (-6dB bandwidth of 86 %), is fabricated on a stainless steel rod with a 3 mm diameter hole. Using the planar transducer, PA imaging experiments is conducted, in which pulsed fiber laser with a wavelength of 532 nm and a power of 0.235 W before focus lens is used. As results, PA signals are obtained with good SNR and two-dimensional PA image is reconstructed.
Masayuki Tanabe; Koki Hirata; Makiko Kobayashi; Masahiko Nishimoto; Tai-Chien Wu; Che-Hua Yang. A sol-gel PZT/PZT transducer for coaxial photoacoustic imaging. 2016 IEEE International Ultrasonics Symposium (IUS) 2016, 1 -4.
AMA StyleMasayuki Tanabe, Koki Hirata, Makiko Kobayashi, Masahiko Nishimoto, Tai-Chien Wu, Che-Hua Yang. A sol-gel PZT/PZT transducer for coaxial photoacoustic imaging. 2016 IEEE International Ultrasonics Symposium (IUS). 2016; ():1-4.
Chicago/Turabian StyleMasayuki Tanabe; Koki Hirata; Makiko Kobayashi; Masahiko Nishimoto; Tai-Chien Wu; Che-Hua Yang. 2016. "A sol-gel PZT/PZT transducer for coaxial photoacoustic imaging." 2016 IEEE International Ultrasonics Symposium (IUS) , no. : 1-4.
Twinkling artifact (TA) is a phenomenon that rapidly alternating color pixels behind a stationary strongly reflecting medium where a comet tail artifact is expected in Doppler mode. Although this phenomenon has a potential in clinical diagnosis for example early detection of microcalcification in dense breast, the occurrence mechanism has not been clarified yet. There have been several hypotheses for underlying mechanism of this phenomenon: surface roughness of calcification, phase jitter noise of the ultrasound machine, and oscillation of reflecting medium. In this study, in-vitro experiments were conducted, and the effects of the oscillating disturbance on a microcalcification embedded in soft tissue were investigated. A transparent poly (vinyl alcohol) hydro (PVA-H) gel with 7 wt% concentration and graphite power with 7 wt% concentration were used. Glass beads were embedded in the phantom. Each diameter is approximately 569 and 213 μm, respectively. All scanning were performed using a medical ultrasound machine (LOGIQ S8 pilot unit, GE Healthcare) with a linear array probe (ML6-15, GE Healthcare). The probe and the phantom were fixed in several ways for the purpose of determining the factor of the TA. As results, when the probe and the phantom were fixed with a stage and the stage was placed on the same table with the ultrasound machine, the twinkling artifact appeared, and stable Doppler shift components appeared in the peak values of the amplitude of successive I/Q signals. When the stage was isolated from the external disturbance including the US machine, the twinkling artifact and Doppler shift components were suppressed. Suppression of the twinkling artifact by control of oscillating environment demonstrated that the twinkling artifact generates from variability among the acoustic signals, not phase jitter or surface roughness of microcalcification. Furthermore, the variability was caused by acoustical oscillation with the speaker.
Yu. Naito; Masayuki Tanabe; Masahiko Nishimoto; Hiroshi Hashimoto; Takao Jibiki; Tadashi Shimazaki. Investigation of twinkling artifact by controlling oscillating disturbance. 2015 IEEE International Ultrasonics Symposium (IUS) 2015, 1 -3.
AMA StyleYu. Naito, Masayuki Tanabe, Masahiko Nishimoto, Hiroshi Hashimoto, Takao Jibiki, Tadashi Shimazaki. Investigation of twinkling artifact by controlling oscillating disturbance. 2015 IEEE International Ultrasonics Symposium (IUS). 2015; ():1-3.
Chicago/Turabian StyleYu. Naito; Masayuki Tanabe; Masahiko Nishimoto; Hiroshi Hashimoto; Takao Jibiki; Tadashi Shimazaki. 2015. "Investigation of twinkling artifact by controlling oscillating disturbance." 2015 IEEE International Ultrasonics Symposium (IUS) , no. : 1-3.
Masayuki Tanabe; Yu Naito; Masahiko Nishimoto; Lei Liu. Effect of pulse repetition frequency on microcalcification detection in color flow imaging. Japanese Journal of Applied Physics 2014, 53, 07KF15 .
AMA StyleMasayuki Tanabe, Yu Naito, Masahiko Nishimoto, Lei Liu. Effect of pulse repetition frequency on microcalcification detection in color flow imaging. Japanese Journal of Applied Physics. 2014; 53 (7S):07KF15.
Chicago/Turabian StyleMasayuki Tanabe; Yu Naito; Masahiko Nishimoto; Lei Liu. 2014. "Effect of pulse repetition frequency on microcalcification detection in color flow imaging." Japanese Journal of Applied Physics 53, no. 7S: 07KF15.