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Stereoscopic portable hybrid gamma imaging for source depth estimation.

S L Bugby1, J E Lees2, W K McKnight2

  • 1Centre for Sensing and Imaging Science, Department of Physics, Loughborough University, Loughborough, E11 3TU, United Kingdom.

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New stereoscopic gamma imaging offers precise depth measurements for radioisotope sources. This advancement enhances surgical localisation, particularly for procedures like sentinel lymph node biopsy.

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Area of Science:

  • Medical Imaging
  • Nuclear Medicine
  • Surgical Technology

Background:

  • Stereoscopic gamma imaging is becoming feasible with hand-held units.
  • Accurate localisation of radioisotope sources is crucial for minimally invasive surgery.

Purpose of the Study:

  • To develop an analytical model for stereoscopic pinhole gamma imaging.
  • To evaluate the performance of this imaging technique for depth measurement.
  • To integrate gamma imaging with optical imaging for enhanced surgical localisation.

Main Methods:

  • Derivation of an analytical model for stereoscopic pinhole imaging.
  • Monte Carlo simulations and benchtop studies for performance evaluation.
  • Combination of stereoscopic gamma imaging with stereoscopic optical imaging.

Main Results:

  • The analytical model predicts performance for various camera configurations.
  • Benchtop studies showed distance measurements with <5 mm deviation for distances of 50-250 mm.
  • The hybrid technique enables depth calculation of subsurface radioisotope sources without external tracking.

Conclusions:

  • Stereoscopic gamma imaging is a viable technology for hand-held units.
  • The developed model accurately predicts imaging performance.
  • The hybrid technique offers a novel solution for improved surgical localisation in procedures like sentinel lymph node biopsy.