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Related Experiment Videos

Quantitative methods for indirect CT lymphography

E R Wisner1, J A Seibert, R W Katzberg

  • 1Department of Radiology, University of California, Davis Medical Center, Sacramento 95817, USA.

Veterinary Radiology & Ultrasound : the Official Journal of the American College of Veterinary Radiology and the International Veterinary Radiology Association
|April 21, 1998
PubMed
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Quantitative CT methods using iodinated nanoparticles enhanced lymph node visibility. This technique shows promise for improving metastasis detection in clinical settings.

Area of Science:

  • Radiology
  • Nanotechnology
  • Medical Imaging

Background:

  • Indirect CT lymphography visualizes lymph nodes using contrast media.
  • Accurate lymph node characterization is crucial for disease detection, particularly metastasis.

Purpose of the Study:

  • To quantitatively characterize contrast-enhanced lymph nodes opacified with iodinated nanoparticles via indirect CT lymphography.
  • To assess the efficacy of iodinated nanoparticles in enhancing lymph node attenuation and conspicuity on CT images.

Main Methods:

  • Four normal swine underwent interstitial injection of iodinated nanoparticles into submucosa and SQ tissues.
  • Quantitative CT parameters including attenuation (HU), volume, iodine concentration, and contrast-to-noise ratio (CNR) were measured.
  • Manual image segmentation and region of interest (ROI) analysis were employed on 24-hour post-contrast CT images.

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Main Results:

  • Opacified lymph nodes showed a 5-20 fold increase in HU and iodine concentration (p < 0.01).
  • Contrast-to-noise ratio (CNR) increased over four-fold (p < 0.001), enhancing lymph node conspicuity.
  • ROI-estimated lymph node volumes closely approximated post-excision weight measurements (R2 = 0.94, p < 0.0001).

Conclusions:

  • Interstitially injected iodinated nanoparticles significantly enhance CT image attenuation and conspicuity of targeted lymph nodes.
  • Quantitative CT methods utilizing these nanoparticles hold potential for improving the accuracy of metastasis detection.