@misc{oai:repo.qst.go.jp:00068834,
 author = {Kershaw, Jeffrey and Nakamura, Kazuhiro and Wakai, Atsushi and Kanno, Iwao and et.al and Ｋｅｒｓｈａｗ Ｊｅｆｆｒｅｙ and 中村 和浩 and 若井 篤志 and 菅野 巖},
 month = {May},
 note = {Recent results have shown that hyperpolarized 129Xe rat head spectra may be affected by changes in the shimming procedure [1]. An example is shown in Fig 1, where the shimming was concentrated on 8 mm thick slices in the cerebellum and brain. The shape of the second peak is clearly affected by the change shimming; however this pattern is not consistent from animal to animal, suggesting that the differences do not simply arise from the choice different slices toshim on.
In preparation for the acquisition of 129Xe rat head spectra, our group has up to this point shimmed the field by monitoring the width and symmetry of the proton resonance whilst altering the shim-coil currents. Unfortunately this methodof shimming can be tedious and is liable to produce nonideal shim states because of the number of parameters involved in the optimization process. Moreover, the field homogeneity may be distorted by the boundaries between tissue and void spaces. To investigate the homogeneity of the field in rat head and as a first step towards studying the possible effects inhomogeneity may have on the 129Xe dissolved phase spectrum, we have implemented a field-mapping algorithm. The results indicate that even with a supposedly well-shimmed state, there is a substantial variation in the field that may cause or contribute to anomalies in rat head spectra., 第14回国際磁気共鳴医学会},
 title = {Field inhomogeneity may substantially affect hyperpolarised 129Xe rat head spectra},
 year = {2006}
}