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Updated: Jul 27, 2026
Evaluation of Nanoparticle Uptake in Tumors in Real Time Using Intravital Imaging
Published on: June 21, 2011
A Molecular Imaging "Skin A Time-resolving Intraoperative Imager for Microscopic Residual Cancer Detection Using
Abstract:
Optimal cancer therapy requires targeted and individualized treatment of all tumor cells, including both gross and microscopic disease. Intraoperatively hard to visualize and often left behind, microscopic foci of residual cancer cells significantly increase the risk of cancer recurrence and treatment failure rates. Fluorescently-tagged targeted molecular labels are employed to guide surgery, but conventional fluorescent intraoperative imagers suffer from lack of sensitivity and maneuverability, limiting practicality in small tumor cavities owing to their cumbersome sizes driven by optics. This work does away with conventional lenses and filters and introduces an optics-free molecular imaging "skin" consisting of only a $25\mu \mathrm{m}$ thin CMOS contact imager that synergistically integrates the long emission lifetimes of upconverting nanoparticles (UCNP) combined with upconversion to use a time domain approach to acquire the image coupled with infrared illumination allowing deep tissue penetration and elimination of autofluorescence. Using this strategy, we are able to visualize UCNPs at fluences (W/cm2) compatible with intraoperative use, opening the door to visualize targeted areas with microscopic sensitivity and facilitate residual microscopic disease detection during surgery, and laying the groundwork for precision post-operative radiation.
Insights
This study introduces an optics-free molecular imaging "skin" for enhanced cancer surgery. This technology detects microscopic residual cancer cells, improving surgical precision and reducing recurrence risk.
Area of Science:
- Biomedical Engineering
- Medical Imaging
- Nanotechnology
Background:
- Microscopic residual cancer cells increase recurrence risk after surgery.
- Current intraoperative imaging lacks sensitivity and maneuverability for microscopic disease.
- Conventional imagers are limited by optics, size, and autofluorescence.
Purpose of the Study:
- To develop a novel, optics-free molecular imaging system for intraoperative detection of residual cancer.
- To overcome limitations of conventional fluorescent imaging in surgical settings.
- To enable visualization of microscopic disease for improved cancer treatment outcomes.
Main Methods:
- An optics-free molecular imaging
- skin
- utilizing a thin CMOS contact imager.
- Integration of upconverting nanoparticles (UCNP) with long emission lifetimes.
- Time-domain imaging approach with infrared illumination for deep tissue penetration and autofluorescence elimination.
Main Results:
- Successful visualization of UCNPs at clinically compatible fluences (W/cm2).
- Demonstrated microscopic sensitivity for detecting residual cancer cells.
- Elimination of autofluorescence and deep tissue penetration achieved.
Conclusions:
- The developed optics-free imaging system offers high sensitivity for microscopic residual cancer detection.
- This technology enhances intraoperative visualization, aiding surgeons in complete tumor removal.
- Paves the way for precision post-operative radiation therapy and improved cancer patient outcomes.
