| Literature DB >> 10533935 |
E Pappas1, T Maris, A Angelopoulos, M Paparigopoulou, L Sakelliou, P Sandilos, S Voyiatzi, L Vlachos.
Abstract
New composition polymer gels, the N-vinylpyrrolidone argon (VIPAR) gels, were developed and investigated as MRI dosimeters. VIPAR gels were irradiated in the dose range of 0-12 Gy by a 6 MV x-ray linear accelerator and MR-scanned in a 1.5 T magnetic resonance imager. A linear relationship was found between absorbed dose and spin spin relaxation rate R2. The dose sensitivity was found to be approximately 0.1 s(-1) Gy(-1) for a gel composition of 4% w/w in N-vinylpyrrolidone, 4% w/w in N,N'-methylene-bisacrylamide, 5% w/w in gelatine type A and 87% w/w in water. This dose sensitivity was stable with time and did not deteriorate even when a boost radiation dose of 2.5 Gy was applied 15 days after the first irradiation. Good reproducibility of these results was observed when a new batch of gels was produced and used for corresponding measurements and analysis.Entities:
Mesh：
Substances：
Year: 1999 PMID： 10533935 DOI： 10.1088/0031-9155/44/10/320
Source DB: PubMed Journal: Phys Med Biol ISSN： 0031-9155 Impact factor: 3.609