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Multispectral Real-time Fluorescence Imaging for Intraoperative Detection of the Sentinel Lymph Node in Gynecologic Oncology
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Evaluation of a CdTe semiconductor based compact γ camera for sentinel lymph node imaging.

Paolo Russo1, Assunta S Curion, Giovanni Mettivier

  • 1Dipartimento di Scienze Fisiche, Università di Napoli Federico II, I-80126 Napoli, Italy. russo@na.infn.it

Medical Physics
|April 28, 2011
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Summary
This summary is machine-generated.

A new compact gamma-ray imaging probe effectively located sentinel lymph nodes in clinical trials. This semiconductor detector probe offers acceptable sensitivity and resolution for SLN localization, with potential for improvement using larger detectors.

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Area of Science:

  • Medical Imaging
  • Nuclear Medicine
  • Semiconductor Detector Technology

Background:

  • Sentinel lymph node (SLN) localization is crucial for cancer staging.
  • Conventional gamma cameras have limitations in sensitivity and resolution for SLN detection.
  • Compact, high-resolution imaging probes are needed for improved SLN localization.

Purpose of the Study:

  • To develop and evaluate a prototype compact gamma-ray imaging probe (MediPROBE) for SLN localization.
  • To assess the laboratory and clinical performance of the MediPROBE compared to a conventional gamma camera.

Main Methods:

  • Utilized a room-temperature Cadmium Telluride (CdTe) pixel detector coupled to a Medipix2 photon-counting readout.
  • Equipped the probe with interchangeable pinhole collimators (0.94, 1.2, 2.1 mm) and adjustable focal distance.
  • Operated the detector at a low-energy threshold of approximately 20 keV.

Main Results:

  • Achieved a background-subtracted sensitivity of 6.5 x 10(-3) cps/kBq and 5.5 mm spatial resolution (FWHM) with the 0.94 mm pinhole at 50 mm distance for 99mTc.
  • Demonstrated effective SLN detection in three melanoma patients within 60-410 seconds acquisition time.
  • Clinical performance showed adequate resolution and acceptable sensitivity for SLN localization.

Conclusions:

  • The MediPROBE, despite limitations from collimator performance and detector size, proved effective in clinical SLN detection.
  • The semiconductor pixel detector probe offers a viable alternative to conventional gamma cameras for SLN localization.
  • Future development with larger CdTe detectors is expected to enhance sensitivity by enabling shorter patient-skin distances.