| JaLCDOI | 10.18926/15198 |
|---|---|
| Title Alternative | Measurement of sampling time in MRI and reconstruction of MR image |
| FullText URL | 014_2_121_128.pdf |
| Author | Kato, Hirokazu| Hanamoto, Katsumi| Kawasaki, Shoji| Shibuya, Koichi| Kuroda, Masahiro| Koyama, Tadashi| |
| Abstract | MRIにおいてk-spaceを構築するためにはエコー信号をサンプリング時間に従って採取する必要がある.このサンプリング時間を測定するために,FOV(field of view)の左半分にファントムを置くことにより階段関数となるスピン分布を生成した｡得られたエコー信号を,階段関数をフ-リェ変換したときに得られるフ-リェ係数と比較することによりサンプリング時間を求めた｡得られたサンプリング時間を用いて,MRI MULTI-TEST PHANTOMをMRI装置でスキャンすることにより得られたエコー信号をサンプリングしk-spaceを構築した。このk-spaceをフ-リェ逆変換することによりMRI MULTI-TEST PHANTOMの画像を再構成することができた。 |
| Keywords | MRI フーリェ変換 (Fourier transform) 画像再構成 (reconstruction) サンプリング時間 (sampling time) |
| Publication Title | 岡山大学医学部保健学科紀要 |
| Published Date | 2004-03-31 |
| Volume | volume14 |
| Issue | issue2 |
| Start Page | 121 |
| End Page | 128 |
| ISSN | 1345-0948 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002307209 |
| JaLCDOI | 10.18926/15215 |
|---|---|
| Title Alternative | A Study of Reconstruction of Magnetic Resonance Image |
| FullText URL | 013_2_077_082.pdf |
| Author | Kato, Hirokazu| Hanamoto, Katsumi| Kuroda, Masahiro| Shibuya, Koichi| Kawasaki, Shoji| |
| Abstract | 磁気共鳴は医学におけるイメージングにおいて重要なモダリティーであり,高度な数学的手法が画像の再構成に取り入れられている｡画像再構成の数学的手法および画像再構成にいたるまでの数学的な過程を理解するこは,MRIを学ぶものにとって非常に重要であるが,成書において明確な説明はなされていない｡ここでは,MR画像の再構成法を,複素関数と複素フ-リェ係数を用いて導いたので報告する｡ |
| Keywords | MRI フーリェ変換 (Fourier transform) 画像再構成 (Reconstruction) 周波数エンコード (Frequency encode) 位相画像 (Phase image) |
| Publication Title | 岡山大学医学部保健学科紀要 |
| Published Date | 2003-03-20 |
| Volume | volume13 |
| Issue | issue2 |
| Start Page | 77 |
| End Page | 82 |
| ISSN | 1345-0948 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002307578 |
| JaLCDOI | 10.18926/15229 |
|---|---|
| Title Alternative | 加温後のtsAF8細胞の細胞周期 |
| FullText URL | 012_2_101_106.pdf |
| Author | Shibuya, Koichi| Kawasaki, Shoji| Kuroda, Masahiro| Asaumi, Jun-ichi| Kato, Hirokazu| Hiraki, Yoshio| |
| Abstract | Thermotolerance in tsAF8 cells develops during incubation at 34℃ after heating at 45℃, while it is suppressed by the following incubation at a non-permissive temperature of 39.7℃ after the same heating. The incubation temperature after heating may affect the cell cycle and consequently thermotolerance. In the present study, a relationship between the thermotolerance and the cell cycle of tsAF8 was investigated. The cell cycle fractions and DNA synthesis were measured by flow cytometry using double staining with propidium iodide and bromodeoxyuridine. When the tsAF8 cells were heated at 45℃ for 20 min, and thereafter incubated at 34℃, bromodeoxyuridine uptake in the S phase cells (DNA synthesis) was recovered to 65.1% 6 h after the heating, and the cells showed gradual accumulation in the G(2)/M phase. When the cells were incubated at 39.7℃ after heating at 45℃ for 20 min, then showed inhibition of thermotolerance development, the DNA synthesis was recovered to 15.1% temporarily 6 h after the heating, but it became 0% after 12 h, and the cells did not remarkably accumulate in any phases of the cell cycle. This inhibition of DNA synthesis at 39.7℃ was considered to be the result of cell survival decreasing by a step-down heating. However, the relationship between the thermotolerance and the cell cycle was not found out in tsAF8 cells, because the cells did not accumulate in any phases of the cell cycle under the inhibitory condition of thermotolerance. |
| Keywords | thermotolerance (温熱耐性) hyperthermia (ハイパーサーミア) tsAF8 cell cycle (細胞周期) |
| Publication Title | 岡山大学医学部保健学科紀要 |
| Published Date | 2002-03-20 |
| Volume | volume12 |
| Issue | issue2 |
| Start Page | 101 |
| End Page | 106 |
| ISSN | 1345-0948 |
| language | English |
| File Version | publisher |
| NAID | 120002307264 |
