PVA cryogel for construction of deformable PET-MR visible phantoms

Georgios M. Soultanidis, Jane E. MacKewn, Charalampos Tsoumpas, Paul K. Marsden

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Positron Emission Tomography (PET) is an imaging method affected by artifacts caused by patient motion. PET-MR simultaneous acquisition may provide the means to correct for the effects of motion. This study investigates the creation of a deformable PVA cryogel phantom for motion correction purposes in PET-MR. This phantom has to contain the appropriate concentration of PVA and a sufficient amount of radioactive tracer along with gadolinium contrast agent. The effect of modifying the standard PVA cryogel process were assessed by measuring differences in the Young's modulus and also the diffusion of radiotracer inside the phantom. The alteration of the freeze-thaw cycle decreased the Young's modulus up to 50% by comparison with the standard MRI cryogel phantom. The diffusion speed on the other hand was found to be at 2 mm h-1 inside a 10% p.w. cryogel. The results are demonstrated with a simultaneous PET-MR experiment. The new approach of cryogel preparation provides the opportunity to create a PET and MR visible phantom with structural complexity and customized shape, which is capable of reproducible deformations when reproducible pressure is applied. The methodology to build the phantom can be used in other simultaneous or sequential imaging modalities such as SPECT and ultrasound.

Original languageEnglish
Article number6423849
Pages (from-to)95-102
Number of pages8
JournalIEEE Transactions on Nuclear Science
Volume60
Issue number1
DOIs
StatePublished - 2013
Externally publishedYes

Keywords

  • MRI
  • PET
  • PVA
  • motion correction

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