In vivo photoacoustic and fluorescence cystography using clinically relevant dual modal indocyanine green

Sensors (Basel). 2014 Oct 21;14(10):19660-8. doi: 10.3390/s141019660.

Abstract

Conventional X-ray-based cystography uses radio-opaque materials, but this method uses harmful ionizing radiation and is not sensitive. In this study, we demonstrate nonionizing and noninvasive photoacoustic (PA) and fluorescence (FL) cystography using clinically relevant indocyanine green (ICG) in vivo. After transurethral injection of ICG into rats through a catheter, their bladders were photoacoustically and fluorescently visualized. A deeply positioned bladder below the skin surface (i.e., ~1.5-5 mm) was clearly visible in the PA and FL image using a laser pulse energy of less than 2 mJ/cm2 (1/15 of the safety limit). Then, the in vivo imaging results were validated through in situ studies. Our results suggest that dual modal cystography can provide a nonionizing and noninvasive imaging tool for bladder mapping.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Diagnostic Imaging*
  • Fluorescence
  • Indocyanine Green*
  • Photoacoustic Techniques / methods*
  • Rats
  • Spectrum Analysis
  • Tomography, X-Ray / methods
  • Urinary Bladder / diagnostic imaging*
  • Urinary Bladder / pathology

Substances

  • Indocyanine Green