A LSO β microprobe for measuring input functions for quantitative small animal PET

S. Maramraju, S. Stoll, C. Woody, D. Schlyer, W. Schiffer, D. Lee, S. Dewey, P. Vaska

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


A miniature scintillation microprobe has been developed to measure the input function in live rodents for use in longitudinal, quantitative PET studies. The probe consists of a small lutetium oxyorthosilicate (LSO) crystal measuring typically 0.3-0.5 mm diameter ×0.5-2 mm in length that is used to directly detect positrons in the blood or tissue. The probe has a sensitivity of 10-30 Hz/μCi/cm3 and is primarily sensitive to short-range positrons emitted by labeled radiotracers in the blood. The sensitivity to γ-ray background can be minimized using a variable threshold in the readout to discriminate between positrons and γ's. The probe was implanted in one of the tail veins of a Sprague-Dawley rat and the input function was measured for the injection of 0.8 mCi of FDG in the other tail vein. The probe exhibits a fast time response that is able to quickly and accurately measure the concentration of 18F circulating in the bloodstream. Additional tests were also carried out to study the probe's sensitivity to γ-ray background.

Original languageEnglish (US)
Pages (from-to)407-410
Number of pages4
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number1-2 SPEC. ISS.
StatePublished - Feb 1 2007

Bibliographical note

Copyright 2008 Elsevier B.V., All rights reserved.


  • Input function
  • LSO
  • Microprobe
  • Small animal PET


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