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Field inhomogeneity may substantially affect hyperpolarised 129Xe rat head spectra
https://repo.qst.go.jp/records/68834
https://repo.qst.go.jp/records/688345f6a9c27-0f9c-45ea-9bda-60a9487cb486
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2007-01-10 | |||||
| タイトル | ||||||
| タイトル | Field inhomogeneity may substantially affect hyperpolarised 129Xe rat head spectra | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_c94f | |||||
| 資源タイプ | conference object | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
Kershaw, Jeffrey
× Kershaw, Jeffrey× Nakamura, Kazuhiro× Wakai, Atsushi× Kanno, Iwao× et.al× Ｋｅｒｓｈａｗ Ｊｅｆｆｒｅｙ× 中村 和浩× 若井 篤志× 菅野 巖 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | 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. |
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| 会議概要（会議名, 開催地, 会期, 主催者等） | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | 第14回国際磁気共鳴医学会 | |||||
| 発表年月日 | ||||||
| 日付 | 2006-05-12 | |||||
| 日付タイプ | Issued | |||||
