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188Re image performance assessment using small animal multi-pinhole SPECT/PET/CT system

Published:December 19, 2016DOI:https://doi.org/10.1016/j.ejmp.2016.11.105

      Highlights

      • The performance of a pre-clinical SPECT/CT system for 188Re imaging is investigated.
      • Image quality and image quantification is assessed for two multi-pinhole collimators.
      • Monte-Carlo simulations of the pre-clinical SPECT system were performed.
      • Image quality and image quantification of 188Re was comparable to 99mTc performance.
      • 188Re images suffered from higher noise due to large number of down-scatter photons.

      Abstract

      Purpose

      The goal of this study was to investigate the performance of a pre-clinical SPECT/PET/CT system for 188Re imaging.

      Methods

      Phantom experiments were performed aiming to assess the characteristics of two multi-pinhole collimators: ultra-high resolution collimator (UHRC) and high-energy ultra high resolution collimator (HE-URHC) for imaging 188Re. The spatial resolution, image contrast and contrast-to-noise ratio (CNR) were investigated using micro-Jaszczak phantoms. Additionally, the quantification accuracy of 188Re images was evaluated using two custom-designed phantoms. The 188Re images were compared to those obtained with 99mTc (gold standard); the acquired energy spectra were analyzed and Monte-Carlo simulations of the UHRC were performed. To verify our findings, a C57BL/6-mouse was injected with 188Re-microspheres and scanned with both collimators.

      Results

      The spatial resolution achieved in 188Re images was comparable to that of 99mTc. Acquisitions using HE-UHRC yielded 188Re images with higher contrast and CNR than UHRC. Studies of quantitative accuracy of 188Re images resulted in <10% errors for both collimators when the activity was calculated within a small VOI around the object of interest. Similar quantification accuracy was achieved for 99mTc. However, 188Re images showed much higher levels of noise in the background. Monte-Carlo simulations showed that 188Re imaging with UHRC is severely affected by down-scattered photons from high-energy emissions. The mouse images showed similar biodistribution of 188Re-microspheres for both collimators.

      Conclusions

      VECTor/CT provided 188Re images quantitatively accurate and with quality comparable to 99mTc. However, due to large penetration of UHRC by high-energy photons, the use of the HE-UHRC for imaging 188Re in VECTor/CT is recommended.

      Keywords

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