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Scatterogram: a method for outlining the body during lymphoscintigraphy without using external flood source.

Mehdi Momennezhad1, Seyed Rasoul Zakavi, Vahid Reza Dabbagh Kakhki

  • 1Nuclear Medicine Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.

Radiology and Oncology
|August 31, 2012
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Summary

Imaging scattered photons after radiotracer injection can outline the body contour in breast cancer patients. This method is feasible, safe, and efficient, aiding in sentinel lymph node visualization without increasing radiation exposure.

Keywords:
body contourbody outliningbreast cancerintradermal injectionlymphoscintigraphyscattered photons

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Area of Science:

  • Nuclear medicine
  • Medical imaging
  • Radiochemistry

Background:

  • Assessing the feasibility of using scattered photons to outline the body contour.
  • Utilizing low-dose intradermal radiotracer injections for imaging.
  • Evaluating the technique in 60 breast cancer patients.

Purpose of the Study:

  • To determine if scattered photons can delineate body outlines.
  • To assess the effectiveness of this method in conjunction with lymphoscintigraphy.
  • To evaluate the safety and efficiency of the imaging technique.

Main Methods:

  • Acquired static lymphoscintigraphy images at 30 minutes and 20 hours post-injection.
  • Utilized two photopeaks: Tc-99m (130-150 keV) and scatter photons (60-120 keV).
  • Constructed fused images using NM-NM fusion workflow; compared with external flood source outlines in 20 cases.

Main Results:

  • Early (30-minute) scatterograms clearly depicted body contours.
  • Delayed (20-hour) scatterograms showed lower quality compared to early images.
  • Fused images effectively showed axillary sentinel nodes and body contours from early scatterograms; processing time averaged 10±5 seconds.

Conclusions:

  • Imaging scattered photons is a feasible method for outlining body contours after intradermal radiotracer injection.
  • This technique does not increase radiation exposure for patients or operators.
  • The imaging method is efficient and does not prolong imaging time.