Mapping of Proton Relaxation Near Superparamagnetic Iron Oxide Particle–Loaded Polymer Threads for Magnetic Susceptibility Difference Quantification
Mapping of Proton Relaxation Near Superparamagnetic Iron Oxide Particle–Loaded Polymer Threads for Magnetic Susceptibility Difference Quantification
复制标题
用于磁化率差异定量的超顺磁性氧化铁颗粒负载聚合物线附近的质子弛豫图
DOI:
10.1097/rli.0b013e3182484fdf
复制
发表时间:
2012
影响因子:
6.7
通讯作者:
Kuhl CK
中科院分区:
文献类型:
--
作者:
Donker HC;Kramer NA;Otto J;Klinge U;Slabu I;Baumann M;Kuhl CK
ObjectivesConventional radiological methods, including magnetic resonance imaging (MRI), fail to visualize polymeric surgical mesh implants because of small thread dimensions and material characteristics. For MRI delineation of such meshes, superparamagnetic iron oxide particles (SPIOs) are integrated in the mesh polymer. Usually, if SPIOs are used as an intravenous contrast agent, they increase the R1 and R2 of adjacent protons. It can be assumed that embedding SPIOs in polymers alters their molecular dynamics. The aim of this study was to investigate the influence of SPIO integration in polymer on the relaxation of adjacent protons.Materials and MethodsPolymer threads were placed in an agarose phantom. At 1.5 T, R1, R2, and R2* maps were calculated from multi inversion-recovery spin echo, multi–spin echo, and multi–gradient echo images, respectively. The threads were aligned parallel or orthogonal to B 0.ResultsNo impact of SPIO on proton R1 and R2 was observed. R2* was increased by the SPIO-loaded threads. R1 and R2 amplitude maps showed a magnetic susceptibility difference of 0.97 ppm/(mg SPIO/g polymer) around SPIO-loaded threads.ConclusionsIn contrast to SPIO in aqueous solutions, polymer-embedded SPIO do not affect proton R1 and R2. However, embedded SPIO generate strong local static magnetic field gradients. Thus, SPIO integration is suitable to control the magnetic susceptibility of polymer threads. This can be exploited to visualize implanted polymer-based meshes in MRI using R2* susceptible sequences. Because no impact on R1 and R2 of adjacent protons by SPIO embedded in mesh threads was observed, structures adjacent to implanted meshes will be observable in R1 and R2 maps.
登录
查看更多内容
DOI:
--
发表时间:
2003
期刊:
Journal of materials science. Materials in medicine
影响因子:
--
作者:
Jian Guo;Xiqun Jiang;Yong Hu;Chang
通讯作者:
Chang
影响因子:
19.7
作者:
J. Gore;S. Majumdar
通讯作者:
S. Majumdar
影响因子:
--
作者:
M. Hodenius;T. Niendorf;G. Krombach;W. Richtering;T. Eckert;H. Lueken;Manfred Speldrich;R. Günther;M. Baumann;S. Soenen;M. de Cuyper;T. Schmitz-Rode
通讯作者:
M. Hodenius;T. Niendorf;G. Krombach;W. Richtering;T. Eckert;H. Lueken;Manfred Speldrich;R. Günther;M. Baumann;S. Soenen;M. de Cuyper;T. Schmitz-Rode
DOI:
--
发表时间:
2005
期刊:
Medical Physics 32(10)
影响因子:
--
作者:
Tsukuba;T. et al.;Kazuhide Inoue;Hirokazu Kato
通讯作者:
Hirokazu Kato
影响因子:
6.7
作者:
N. Krämer;H. Donker;J. Otto;M. Hodenius;J. Sénégas;I. Slabu;U. Klinge;M. Baumann;A. Müllen;B. Obolenski;R. Günther;G. Krombach
通讯作者:
G. Krombach