Handheld real-time LED-based photoacoustic and ultrasound imaging system for accurate visualization of clinical metal needles and superficial vasculature to guide minimally invasive procedures

Wenfeng Xia*, Mithun Kuniyil Ajith Singh, Efthymios Maneas, Naoto Sato, Yusuke Shigeta, Toshitaka Agano, Sebastian Ourselin, Simeon J. West, Adrien E. Desjardins

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

77 Citations (Scopus)
127 Downloads (Pure)

Abstract

Ultrasound imaging is widely used to guide minimally invasive procedures, but the visualization of the invasive medical device and the procedure’s target is often challenging. Photoacoustic imaging has shown great promise for guiding minimally invasive procedures, but clinical translation of this technology has often been limited by bulky and expensive excitation sources. In this work, we demonstrate the feasibility of guiding minimally invasive procedures using a dual-mode photoacoustic and ultrasound imaging system with excitation from compact arrays of light-emitting diodes (LEDs) at 850 nm. Three validation experiments were performed. First, clinical metal needles inserted into biological tissue were imaged. Second, the imaging depth of the system was characterized using a blood-vessel-mimicking phantom. Third, the superficial vasculature in human volunteers was imaged. It was found that photoacoustic imaging enabled needle visualization with signal-to-noise ratios that were 1.2 to 2.2 times higher than those obtained with ultrasound imaging, over insertion angles of 26 to 51 degrees. With the blood vessel mimicking phantom, the maximum imaging depth was 38 mm. The superficial vasculature of a human middle finger and a human wrist were clearly visualized in real-time. We conclude that the LED-based system is promising for guiding minimally invasive procedures with peripheral tissue targets.

Original languageEnglish
Article number1394
JournalSensors (Switzerland)
Volume18
Issue number5
Early online date1 May 2018
DOIs
Publication statusPublished - 2018

Keywords

  • LED
  • Minimally invasive procedures
  • Needle guidance
  • Photoacoustic imaging
  • Ultrasonography
  • Vasculature

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