Search

Your search keyword '"Oriuchi, Noboru"' showing total 721 results
Start Over Author "Oriuchi, Noboru"
721 results on '"Oriuchi, Noboru"'

8. A randomised phase II trial of capecitabine plus cisplatin versus S-1 plus cisplatin as a first-line treatment for advanced gastric cancer: Capecitabine plus cisplatin ascertainment versus S-1 plus cisplatin randomised PII trial (XParTS II)

Author

Nishikawa, Kazuhiro, Tsuburaya, Akira, Yoshikawa, Takaki, Kobayashi, Michiya, Kawada, Junji, Fukushima, Ryoji, Matsui, Takanori, Tanabe, Kazuaki, Yamaguchi, Kazuya, Yoshino, Shigefumi, Takahashi, Masazumi, Hirabayashi, Naoki, Sato, Seiji, Nemoto, Hiroshi, Rino, Yasushi, Nakajima, Junta, Aoyama, Toru, Miyagi, Yohei, Oriuchi, Noboru, Yamaguchi, Kensei, Miyashita, Yumi, Morita, Satoshi, and Sakamoto, Junichi

Published
2018
Full Text
View/download PDF

17. Construction of a Phantom for Image Quality Evaluation in PET/MRI System

Author

Takahashi, Yasuyuki, Nemoto, Ayaka, Hosokawa, Shota, Ito, Hiroshi, and Oriuchi, Noboru

Subjects
Cultural Studies, History, Literature and Literary Theory, Technical Point of View
Abstract

Background: There is no phantom for image quality test in magnetic resonance imaging combined with positron emission tomography systems (PET/MRI systems). In MRI, radioactive water phantom containing 2-deoxy-2-[F-18] fluoro-D-glucose ((18)F-FDG) cannot be used due to the dielectric effect. Even for phantoms filled with MR-available solutions, the source current of the RF coil is strongly disturbed as the diameter of the phantom increases. Stable MR images require proper phantom size and solution selection. Previous reports have not provided these details. Other than that, few existing phantoms evaluate negative signals such as N-13 ammonia ((13)N-NH(3)). We created a phantom for PET/MRI system for image quality test. Methods: The phantom for the PET/MRI system was assembled in two portions. One portion is a signal part containing (18)F-FDG radioactive water. The other portion is filled with polyvinyl alcohol glue to construct MRI image to generate µ-map. The glue part is allowed to rewrite the table position overlaps with the first layer, and attenuation correction is performed. Signals are set as positive (4 times and twice higher than background radioactivity) and negative (no radioactivity) columns with different sizes (15 mm φ and 7 mm φ). The PET images with X-ray computed tomography-based attenuation correction (CT-AC) and MRI-AC were evaluated by %-contrasts, variation and uniformity. Results: The %-contrasts of the positive shallow signals with PET/magnetic resonance (MR) and PET/CT were 41.8% and 45.4%, respectively. And it of the positive deep signals with PET/MR and PET/CT were 40.7% and 44.9%. On the other hand, the %-contrasts of the negative shallow signals with PET/MR and PET/CT were 62.3% and 65.6%, respectively. And it of the negative deep signals with PET/MR and PET/CT were 60.7% and 63.7%. Moreover, the % Nj index of uniformity was 2.0% on PET/MRI images and 0.34% on PET/CT images. For negative signals that assume a decrease in myocardial blood flow, The image quality of MR-AC was almost the same as that of CT-AC. Consistency between the images after CT-AC and MR-AC correction were confirmed, and in particular, a stable MR-AC µ-map was obtained in the phantom study. Conclusion: The suggested prototype phantom for generating µ-map is reasonable and useful for evaluating PET/MRI image quality, based on the present standard.

Published
2022

20. Artifacts in FDG-PET

Author

Inoue, Tomio, Oriuchi, Noboru, Kim, E. Edmund, Kim, E. Edmund, editor, Lee, Myung-Chul, editor, Inoue, Tomio, editor, and Wong, Wai Hoi, editor

Published
2004
Full Text
View/download PDF

37. Determination of brain tumor recurrence using 11 C‐methionine positron emission tomography after radiotherapy

Author

Yamaguchi, Shigeru, primary, Hirata, Kenji, additional, Okamoto, Michinari, additional, Shimosegawa, Eku, additional, Hatazawa, Jun, additional, Hirayama, Ryuichi, additional, Kagawa, Naoki, additional, Kishima, Haruhiko, additional, Oriuchi, Noboru, additional, Fujii, Masazumi, additional, Kobayashi, Kentaro, additional, Kobayashi, Hiroyuki, additional, Terasaka, Shunsuke, additional, Nishijima, Ken‐ichi, additional, Kuge, Yuji, additional, Ito, Yoichi M., additional, Nishihara, Hiroshi, additional, Tamaki, Nagara, additional, and Shiga, Tohru, additional

Published
2021
Full Text
View/download PDF

38. Determination of brain tumor recurrence using C-11-methionine positron emission tomography after radiotherapy

Author

Yamaguchi, Shigeru, Hirata, Kenji, Okamoto, Michinari, Shimosegawa, Eku, Hatazawa, Jun, Hirayama, Ryuichi, Kagawa, Naoki, Kishima, Haruhiko, Oriuchi, Noboru, Fujii, Masazumi, Kobayashi, Kentaro, Kobayashi, Hiroyuki, Terasaka, Shunsuke, Nishijima, Ken-ichi, Kuge, Yuji, Ito, Yoichi M., Nishihara, Hiroshi, Tamaki, Nagara, Shiga, Tohru, Yamaguchi, Shigeru, Hirata, Kenji, Okamoto, Michinari, Shimosegawa, Eku, Hatazawa, Jun, Hirayama, Ryuichi, Kagawa, Naoki, Kishima, Haruhiko, Oriuchi, Noboru, Fujii, Masazumi, Kobayashi, Kentaro, Kobayashi, Hiroyuki, Terasaka, Shunsuke, Nishijima, Ken-ichi, Kuge, Yuji, Ito, Yoichi M., Nishihara, Hiroshi, Tamaki, Nagara, and Shiga, Tohru

Abstract

We conducted a prospective multicenter trial to compare the usefulness of C-11-methionine (MET) and F-18-fluorodeoxyglucose (FDG) positron emission tomography (PET) for identifying tumor recurrence. Patients with clinically suspected tumor recurrence after radiotherapy underwent both C-11-MET and F-18-FDG PET. When a lesion showed a visually detected uptake of either tracer, it was surgically resected for histopathological analysis. Patients with a lesion negative to both tracers were revaluated by magnetic resonance imaging (MRI) at 3 months after the PET studies. The primary outcome measure was the sensitivity of each tracer in cases with histopathologically confirmed recurrence, as determined by the McNemar test. Sixty-one cases were enrolled, and 56 cases could be evaluated. The 38 cases where the lesions showed uptake of either C-11-MET or F-18-FDG underwent surgery; 32 of these cases were confirmed to be subject to recurrence. Eighteen cases where the lesions showed uptake of neither tracer received follow-up MRI; the lesion size increased in one of these cases. Among the cases with histologically confirmed recurrence, the sensitivities of C-11-MET PET and F-18-FDG PET were 0.97 (32/33, 95% confidence interval [CI]: 0.85-0.99) and 0.48 (16/33, 95% CI: 0.33-0.65), respectively, and the difference was statistically significant (P < .0001). The diagnostic accuracy of C-11-MET PET was significantly better than that of F-18-FDG PET (87.5% vs. 69.6%, P = .033). No examination-related adverse events were observed. The results of the study demonstrated that C-11-MET PET was superior to F-18-FDG PET for discriminating between tumor recurrence and radiation-induced necrosis.

Published
2021

Catalog

Books, media, physical & digital resources
See catalog results