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学位論文 |
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澁谷, 孝行 ; Shibutani, Takayuki
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博士論文本文Full 以下に掲載：Annals of Nuclear Medicine 31(7) pp.529-535 2017. Springer. 共著者：Takayuki Shibutani, Masahisa Onoguchi, Hiroto Yoneyama, Takahiro Konishi, Shinro Matsuo, Kenichi Nakajima, Seigo Kinuya
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学位論文 |
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澁谷, 孝行 ; Shibutani, Takayuki
概要:
博士論文要旨Abstract 以下に掲載：Annals of Nuclear Medicine 31(7) pp.529-535 2017. Springer. 共著者：Takayuki Shibutani, Masahisa Onoguchi, Hiroto Yoneyama, Takahiro Konishi, Shinro Matsuo, Kenichi Nakajima, Seigo Kinuya
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中嶋, 憲一 ; 澁谷, 孝行 ; 小野口, 昌久 ; 奥田, 光一 ; 米山, 寛人 ; 松尾, 信郎 ; 清水, 威志 ; Nakajima, Kenichi ; Shibuya, Takayuki ; Onoguchi, Masahisa ; Okuda, Koichi ; Yoneyama, Hiroto ; Matsuo, Shinro ; Shimizu, Takeshi
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Shibutani, Takayuki ; Onoguchi, Masahisa ; Yoneyama, Hiroto ; Konishi, Takahiro ; Matsuo, Shinro ; Nakajima, Kenichi ; 澁谷, 孝行 ; 松尾, 信郎 ; 中嶋, 憲一
概要:
金沢大学医薬保健研究域保健学系<br />ObjectivesAlthough the utility of IQ-SPECT imaging using 99mTc and 201Tl myocardial perfusion SPECT
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has been reported, 123I-labeled myocardial SPECT has not been fully evaluated. We determined the characteristics and utility of 123I IQ-SPECT imaging compared with conventional SPECT (C-SPECT).MethodsTwo myocardial phantom patterns were used to simulate normal myocardium and myocardial infarction. SPECT acquisition was performed using a hybrid dual-head SPECT/CT system equipped with a SMARTZOOM collimator for IQ-SPECT or a low-medium energy general purpose collimator for C-SPECT. Projection data were reconstructed using ordered subset expectation maximization with depth-dependent 3-dimensional resolution recovery for C-SPECT and ordered subset conjugate gradient minimizer method for IQ-SPECT. Three types of myocardial image were created; namely, no correction (NC), with attenuation correction (AC), and with both attenuation and scatter corrections (ACSC). Five observers visually scored the homogeneity of normal myocardium and defect severity of the myocardium with inferior defects by a five-point scale: homogeneity scores (5 = homogeneous to 1 = inhomogeneous) and defect scores (5 = excellent to 1 = poor). We also created a 17-segment polar map and quantitatively assessed segmental %uptake using a myocardial phantom with normal findings and defects.ResultsThe average visual homogeneity scores of the IQ-SPECT with NC and ACSC were significantly higher than that of C-SPECT, whereas the average visual defect scores of IQ-SPECT with AC and ACSC were significantly lower. The %uptake of all segments for IQ-SPECT with NC was significantly higher than that of C-SPECT. Furthermore, the subtraction of %uptake for C-SPECT and IQ-SPECT was the largest in inferior wall, which was approximately 10.1%, 14.7% and 14.4% for NC, AC and ACSC, respectively. The median % uptake values of the inferior wall with defect areas for C-SPECT and IQ-SPECT were 46.9% and 50.7% with NC, 59.8% and 69.2% with AC, and 54.7% and 66.5% with ACSC, respectively.Conclusion123I IQ-SPECT imaging significantly improved the attenuation artifact compared with C-SPECT imaging. Although the defect detectability of IQ-SPECT was inferior to that of C-SPECT, 123I IQ-SPECT images with NC and ACSC met the criteria for defect detectability. Use of 123I IQ-SPECT is suitable for routine examinations.<br />Embargo Period 12 months
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論文
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Shibutani, Takayuki ; Nakajima, Kenichi ; Wakabayashi, Hiroshi ; Mori, Hiroshi ; Matsuo, Shinro ; Yoneyama, Hiroto ; Konishi, Takahiro ; Okuda, Koichi ; Onoguchi, Masahisa ; Kinuya, Seigo ; 澁谷, 孝行 ; 中嶋, 憲一 ; 若林, 大志 ; 松尾, 信郎 ; 米山, 寛人 ; 小野口, 昌久 ; 絹谷, 清剛
概要:
金沢大学医薬保健研究域保健学系<br />ObjectivesThe patient-based diagnosis with an artificial neural network (ANN) has shown potential u
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tility for the detection of coronary artery disease; however, the region-based accuracy of the detected regions has not been fully evaluated. The aim of this study was to demonstrate the accuracy of all detected regions compared with expert interpretation.\nMethodsA total of 109 abnormal regions including 33 regions with stress defects and 76 regions with ischemia were examined, which were derived from 21 patients who underwent myocardial perfusion SPECT within 45 days of coronary angiography. The gray and color scale images, a polar map of stress, rest and difference, and left ventricular function were displayed on the monitor to score the extent and severity of stress defect and ischemia. Two experienced nuclear medicine physicians (Observers A and B) scored the abnormality with a 4-point scale and draw abnormal regions on a polar map. The gold standard was determined by the final judgment of normal or abnormal by the consensus of two other independent expert nuclear cardiologists, and was compared with the stress defect and ischemia derived from ANN.\nResultsThe concordance rate of ANN to the gold standard was higher than that of two observers. Furthermore, the κ coefficient indicated moderate to substantial agreement for stress defect and slight to the fair agreement for ischemia. The area under the curve (AUC) of ANN was the highest for both stress defect and ischemia; in particular, the ANN of ischemia showed significantly higher AUC than Observer A (p = 0.005). The ANN of stress defect showed higher specificity compared with two observers, while the ANN of ischemia showed higher sensitivity. Consequently, the accuracy of ANN showed the highest in this study.\nConclusionThe ANN-based regional diagnosis showed a high concordance rate with the gold standard and comparable or even higher than the interpretation by nuclear medicine physicians.<br />Embargo Period 12 months
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Hiromasa, Tomo ; Taki, Junichi ; Wakabayashi, Hiroshi ; Inaki, Anri ; Okuda, Koichi ; Shibutani, Takayuki ; Shiba, Kazuhiro ; Kinuya, Seigo ; 廣正, 智 ; 瀧, 淳一 ; 若林, 大志 ; 稲木, 杏吏 ; 澁谷, 孝行 ; 柴, 和弘 ; 絹谷, 清剛
概要:
金沢大学疾患モデル総合研究センター<br />Few studies have evaluated myocardial perfusion and ventricular function in normal, growing rats.
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We, therefore, evaluated serial changes in cardiac perfusion and function during the growth of normal rats using single photon emission computed tomography (SPECT) with technetium (99mTc)-sestamibi. Gated SPECT was serially performed in six normal rats. The left ventricular end-diastolic volume (EDV), end-systolic volume (ESV), stroke volume (SV) and ejection fraction (EF) were calculated with Quantitative Gated SPECT software. The perfusion distribution was calculated as the percentage uptake of each of the 17 segments using Quantitative Perfusion SPECT software. As expected, the body weight (BW) of the rats increased with growth, but their heart rates (HR) did not change over time. EF decreased very slowly over time and showed a negative correlation with BW. EDV, ESV and SV showed strong positive correlations with BW. There were no significant differences in the percentage segmental uptake in 13 of the 17 segments during growth, except for three basal and one apical segments. Therefore, a single normal database could be applied for the evaluation of perfusion abnormalities in rats of at least 8 to 28 weeks old. © 2020, The Author(s).
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澁谷, 孝行 ; Shibutani, Takayuki
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金沢大学医薬保健研究域保健学系<br />小動物研究の中で虚血性心疾患の評価に重要な心筋バイアビリティは，別時相で収集されるため，小動物の時相差に伴う生理状態の違いが定量誤差となり，病態と分子情報のミスマッチが生じていた。その問題を解決する
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ために，本研究ではTc-99m心筋血流とF-18の心筋糖代謝情報を対象に本邦初導入された小動物用SPECT・PET同時収集システムを用いて複数分子同時収集における心筋バイアビリティ定量評価法を開発した。小動物を模擬したファントムを新たに開発し，複数分子同時収集で問題となるクロストークによる画質劣化と部分容積効果による定量値の過小評価を改善するための補正技術を確立させた。<br />Myocardial viability evaluation which is important for ischemic heart disease in small animal studies is acquired in different time phases, and it was a mismatch between the pathological condition and the molecular information due to the quantitative error caused by the difference in physiological state caused by the time phase difference of small animals. To resolve this problem, we developed a quantitative evaluation method of myocardial viability in simultaneous acquisition of multiple molecules for Tc-99m myocardial blood flow and F-18 myocardial glucose metabolism using the small animal SPECT/PET simultaneous acquisition system introduced for the first time in Japan.A phantom simulating a small animal was newly developed, and a correction technique was established to improve image quality due to crosstalk and underestimation of quantitative values caused by partial volume effect which are problems in simultaneous acquisition of multiple molecules.<br />研究課題/領域番号:18K15628, 研究期間(年度):2018-04-01 - 2021-03-31<br />出典：「小動物SPECT・PET同時測定法における物理現象の解明と定量評価法の確立」研究成果報告書 課題番号18K15628（KAKEN：科学研究費助成事業データベース（国立情報学研究所）） （https://kaken.nii.ac.jp/report/KAKENHI-PROJECT-18K15628/18K15628seika/ ）を加工して作成
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