『徳島大学 教育・研究者情報データベース (EDB)』---[学外] /
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登録内容 (EID=322774)

EID=322774EID:322774, Map:0, LastModified:2017年8月17日(木) 17:57:34, Operator:[林 裕晃], Avail:TRUE, Censor:0, Owner:[金澤 裕樹], Read:継承, Write:継承, Delete:継承.
種別 (必須): 国際会議 [継承]
言語 (必須): 英語 [継承]
招待 (推奨):
審査 (推奨): Peer Review [継承]
カテゴリ (推奨): 研究 [継承]
共著種別 (推奨):
学究種別 (推奨): 修士課程学生による研究報告 [継承]
組織 (推奨):
著者 (必須): 1.松元 友暉 ([徳島大学.大学院医歯薬学研究部.医学域.先端臨床医学教育研究プロジェクト]/[徳島大学.大学院医歯薬学研究部.医学域.医科学部門.内科系.放射線医学])
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[継承]
2.金澤 裕樹 ([徳島大学.大学院医歯薬学研究部.保健学域.保健科学部門.放射線科学系.医用画像情報科学]/徳島大学大学院医歯薬学研究部医用画像情報科学分野)
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[継承]
3. (英) Sasaki Toshiaki (日) (読)
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[継承]
4. (英) Ikemitsu Natsuki (日) (読)
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貢献度 (任意):
学籍番号 (推奨):
[継承]
5.林 裕晃
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学籍番号 (推奨):
[継承]
6. (英) Miyoshi Mitsuharu (日) (読)
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学籍番号 (推奨):
[継承]
7.原田 雅史 ([徳島大学.大学院医歯薬学研究部.医学域.医科学部門.内科系.放射線医学])
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[継承]
8.大塚 秀樹 ([徳島大学.大学院医歯薬学研究部.保健学域.保健科学部門.放射線科学系.画像医学・核医学]/[徳島大学.医学部.保健学科.放射線技術科学専攻.診療放射線技術学講座])
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貢献度 (任意):
学籍番号 (推奨):
[継承]
題名 (必須): (英) Phase Correction for Quantitative Susceptibility Mapping (QSM) using T2* Mapping  (日)    [継承]
副題 (任意):
要約 (任意): (英) Objectives : The purpose of this study is to develop a phase correction method focusing on the SNR of phase and to improve the quantitative measurement of QSM. Methods : On a 3.0 T MRI system (Discovery MR750; GE Healthcare), using three-dimensional spoiled gradient-echo (3D-SPGR) sequence with multiple TEs were used in this study. The imaging parameters were TE, 12 echoes from 3.1 to 51.7 ms (ΔTE = 4.4 ms); repetition time, 55.5 ms; spatial resolution, 1.0 × 1.0 × 1.0 mm; and pixel bandwidth, 244.1 Hz. We conducted a phantom experiment in this study. Five tubes were filled with different concentrations (100, 150, 200, 250, and 300 mg/mL) of calcium hydroxyapatite samples. In this study, we focused on the computation of off-set frequency of each voxel (i.e., field map estimation). At first, we calculate the TE having the maximum for our setting number of echo from the measured T2* map. Second, the ``appropriate TE dataset'' was defined as the maximum SNR dataset with appropriate TE and two datasets with neighboring TE. Third, after estimating the field map using the appropriate TE dataset, a corrected phase angle at each phase angle of the appropriate TE dataset was calculated from a mean resultant length which is the length of the average vectors calculated from all phase angles. Then, the corrected phase angle was defined from mean resultant length. Finally, all phase angles in FOV were corrected for each appropriate TE dataset. Results : The linearity of the relationship between the measured susceptibility and the concentration of hydroxyapatite in the corrected phase dataset was significantly higher than other methods (R = 0.30 VS 0.97). Conclusions : The correction method in QSM using phase correction method makes it possible to more accurately obtain susceptibility information of tissue having a short T2*.  (日)    [継承]
キーワード (推奨): 1. (英) QSM (日) (読) [継承]
2. (英) echo time (日) (読) [継承]
3. (英) T2* (日) (読) [継承]
4. (英) SNR of phase (日) (読) [継承]
5. (英) susceptibility (日) (読) [継承]
発行所 (推奨):
誌名 (必須): (英) The 5th International Congress on Magnetic Resonance Imaging (日) (読)
ISSN (任意):
[継承]
(必須): 2017 [継承]
(必須): FA [継承]
(必須): 111 111 [継承]
都市 (必須): ソウル (Seoul/[大韓民国]) [継承]
年月日 (必須): 西暦 2017年 3月 初日 (平成 29年 3月 初日) [継承]
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標準的な表示

和文冊子 ● Yuki Matsumoto, Yuki Kanazawa, Toshiaki Sasaki, Natsuki Ikemitsu, Hiroaki Hayashi, Mitsuharu Miyoshi, Masafumi Harada and Hideki Otsuka : Phase Correction for Quantitative Susceptibility Mapping (QSM) using T2* Mapping, The 5th International Congress on Magnetic Resonance Imaging, Vol.2017, No.FA, 111, Seoul, March 2017.
欧文冊子 ● Yuki Matsumoto, Yuki Kanazawa, Toshiaki Sasaki, Natsuki Ikemitsu, Hiroaki Hayashi, Mitsuharu Miyoshi, Masafumi Harada and Hideki Otsuka : Phase Correction for Quantitative Susceptibility Mapping (QSM) using T2* Mapping, The 5th International Congress on Magnetic Resonance Imaging, Vol.2017, No.FA, 111, Seoul, March 2017.

関連情報

Number of session users = 5, LA = 0.65, Max(EID) = 383385, Max(EOID) = 1024765.