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Magnetically Actuated Forward-Looking Interventional Ultrasound Imaging: Feasibility Studies

Magnetically Actuated Forward-Looking Interventional Ultrasound Imaging: Feasibility Studies
Park, JinhyoungLee, ChangyangLee, JunsuHa, Jung-IkChoi, HongsooChang, Jin Ho
DGIST Authors
Choi, HongsooChang, Jin Ho
Issued Date
Article Type
Author Keywords
Magnetic resonance imagingCathetersUltrasonic imagingTransducersMagnetic fieldsCoilsForward-LookingIntravascular UltrasoundInterventional Ultrasound ImagingMagnetically Actuated
Objective: Interventional ultrasound imaging is a prerequisite for guiding implants and treatment within the hearts and blood vessels. Due to limitations on the catheter's diameter, interventional ultrasonic transducers have side-looking structures although forward-looking imaging may provide more intuitive and real time guidance in treating diseased sites ahead of catheters. To address the issue, a magnetically actuated forward-looking interventional ultrasound imaging device is implemented for the first time. Methods: A forward-looking catheter containing a 1 mm ring type focused 35 MHz ultrasound transducer and a micro magnet, was fabricated. For imaging, the transducer was placed at the center of four electromagnetic coils positioned on four sides of a squared acrylic housing. By modifying the magnetic field, the catheter tip could be remotely translated for sector scanning. Results: The scanning angle could reach up to 3° in 1 Hz with 15 mT, while wider angles of 5° could be achieved with a higher magnetic field of 25 mT for ex-vivo imaging. The position of the transducer could be detected by monitoring the motion with a CCD camera, mimicking clinical X-ray imaging. In the wire target and tissue mimicking phantom studies, the measured hole size, spatial resolution and distance between wires by the proposed system were comparable with the values from a linear scanner. Multi-frame real time data acquisition was demonstrated via ex-vivo imaging on a pig's coronary artery. Conclusion/Significance: The feasibility of magnetically actuated forward-looking interventional ultrasound imaging was demonstrated. The remote-controlled scanning method may allow to simplify the structures of forward-looking interventional ultrasound imaging catheters.
Institute of Electrical and Electronics Engineers
Related Researcher
  • 최홍수 Choi, Hongsoo 로봇및기계전자공학과
  • Research Interests Micro/Nano robot; Neural prostheses; MEMS; BMI; MEMS/NEMS; BioMEMS; MEMS 초음파 트랜스듀스; 인공와우
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Appears in Collections:
Department of Electrical Engineering and Computer Science Medical Acoustic Fusion Innovation Lab. 1. Journal Articles
Department of Robotics and Mechatronics Engineering Bio-Micro Robotics Lab 1. Journal Articles


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