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141 results on '"Imaoka, Izumi"'

2. Uterine diverticulum mimicking endometriotic cyst of the ovary

Author

Nishiuchi, Kentaro, primary, Uotani, Kensuke, additional, Kobayashi, Daigo, additional, Ono, Yumi, additional, Yamasaki, Yuko, additional, Kashima, Yukio, additional, Nishijima, Mitsuhiro, additional, Ueno, Yoshiko, additional, Imaoka, Izumi, additional, and Murakami, Takamichi, additional

Published
2024
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18. Contributors

Author

Andrews, Carol L., primary, Ascher, Susan M., additional, Balci, N. Cem, additional, Becker, Minerva, additional, Bisset, George S., additional, Boles, Scott M., additional, Bragg, David G., additional, Brenner, R. James, additional, Burman, Chandra M., additional, Chang, Susan, additional, Charnsangavej, Chusilp, additional, Chen, George T.Y., additional, Cheng, Gang, additional, Chin, Cynthia T., additional, Chong, Vincent F.H., additional, Chui, Chen-Shou, additional, Dershaw, D. David, additional, Dillon, William P., additional, Donnelly, Lane F., additional, Dunnick, N. Reed, additional, Eberhardt, Steven C., additional, Edmundson, Gregory K., additional, Egelhoff, John C., additional, Fan, Y.F., additional, Fatterpekar, Girish, additional, Fuks, Zvi Y., additional, Gore, Richard M., additional, Gotway, Michael B., additional, Griff, Simone K., additional, Grossfeld, Gary D., additional, Hamilton, Russell J., additional, Hari, Anil, additional, Hellman, Samuel, additional, Hendee, William R., additional, Hricak, Hedvig, additional, Hunt, Margie A., additional, Hynes, Patricia E., additional, Imaoka, Izumi, additional, Jaffray, David A., additional, Jha, Reena C., additional, Jolesz, Ferenc A., additional, Kelvin, Frederick M., additional, Lappas, John C., additional, Lee, Jean S., additional, Leibel, Steven A., additional, Liao, Lydia, additional, Ling, C. Clifton, additional, Liu, Haisong, additional, Loevner, Laurie A., additional, LoSasso, Thomas J., additional, Mageras, Gikas S., additional, Maglinte, Dean D.T., additional, Manaster, B.J., additional, Martinez, Alvaro A., additional, Meux, Maya D., additional, Miller, Frank H., additional, Mize, William A., additional, Mukherji, Suresh K., additional, Munden, Reginald F., additional, Murray, Kathleen A., additional, O'Hara, Sara M., additional, Okuno, William, additional, Pelizzari, Charles A., additional, Rubin, Philip, additional, Semelka, Richard C., additional, Sharpe, Michael B., additional, Sickles, Edward A., additional, Siegelman, Evan S., additional, Slovick, Frank T., additional, Stockberger, Stephan M., additional, Sullivan, Daniel C., additional, Sundaram, Murali, additional, Tatum, James L., additional, Wall, Susan D., additional, Wefer, Antje, additional, Williams, Jacqueline P., additional, Wong, John W., additional, Yaghmai, Vahid, additional, Yan, Di, additional, Yin, Fang-Fang, additional, Yu, Kyle K., additional, Yu, Yan, additional, and Zelefsky, Michael J., additional

Published
2002
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22. Corrigendum to “Estimation of liver function using T2* mapping on gadolinium ethoxybenzyl diethylenetriamine pentaacetic acid enhanced magnetic resonance imaging” [Eur. J. Radiol. 81 (7) (2012) 1460–1464]

Author

Katsube, Takashi, primary, Okada, Masahiro, additional, Kumano, Seishi, additional, Imaoka, Izumi, additional, Kagawa, Yuki, additional, Hori, Masatoshi, additional, Ishii, Kazunari, additional, Tanigawa, Noboru, additional, Imai, Yasuharu, additional, Kudo, Masatoshi, additional, and Murakami, Takamichi, additional

Published
2013
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23. T2* relaxometry mapping of the uterine zones

Author

Imaoka, Izumi, primary, Nakatsuka, Takayuki, additional, Araki, Tetsuro, additional, Katsube, Takashi, additional, Okada, Masahiro, additional, Kumano, Seishi, additional, Ishii, Kazunari, additional, Ashikaga, Ryuichiro, additional, Okuaki, Tomoyuki, additional, Van Cauteren, Marc, additional, and Murakami, Takamichi, additional

Published
2012
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25. Unenhanced fat fraction ratios obtained by MR and enhanced T2* values with liver-specific MR contrast agents for diagnosis of non-alcoholic steatohepatitis in rats

Author

Okada, Masahiro, primary, Katsube, Takashi, additional, Kumano, Seishi, additional, Kagawa, Yuki, additional, Araki, Tetsuro, additional, Tsuda, Natsuko, additional, Okuaki, Tomoyuki, additional, Imaoka, Izumi, additional, Tanigawa, Noboru, additional, Ishii, Kazunari, additional, and Murakami, Takamichi, additional

Published
2011
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47. Ring-shaped lateral ventricular nodules: an incidental finding on brain magnetic resonance imaging.

Author

Shimono, Taro, Hosono, Makoto, Ashikaga, Ryuichiro, Kumano, Seishi, Imaoka, Izumi, Yagyu, Yukinobu, Okada, Masahiro, Kuwabara, Masatomo, and Murakami, Takamichi

Subjects
CEREBRAL ventricles, BRAIN imaging, MAGNETIC resonance imaging, MEDICAL imaging systems, DIAGNOSTIC imaging, TUMORS
Abstract

We have occasionally seen ring-shaped lateral ventricular nodules <1 cm in diameter during routine brain magnetic resonance imaging (MRI). We investigated retrospectively clinical and MRI findings of the nodules. Review of radiological records was performed for 39,607 patients who underwent brain MRI between January 2001 and April 2008. Nodules were assessed for number, location, shape, and signal intensity, which was determined based on the range of signal intensity from gray to white matter on T1- and T2-weighted imaging. Fluid-attenuated inversion recovery (FLAIR) and diffusion-weighted imaging (DWI), contrast enhancement characteristics, and serial MRI changes of nodules were assessed when available. Nine of 39,607 patients (0.023%) showed the nodules. No symptoms associated with the nodules. Among the nine patients, 11 nodules were identified (one nodule in seven patients (77.8%) and two nodules in two patients (22.2%)). Location was limited to the roof of the body for six nodules (54.5%) and the frontal horn for five patients (45.5%). All nodules (100%) were round and isointense on T1- and T2-weighted imaging. On FLAIR imaging of eight nodules, six (75%) were hyperintense, and two (25%) were isointense. On DWI of seven nodules, all nodules (100%) were isointense. None of seven nodules (0%) examined using postcontrast MRI showed enhancement. None of eight nodules (0%) examined using serial MRI (range, 4–60 months) showed changes in morphology over time. These nodules were incidentally encountered and shared similar MRI features. Although pathological confirmation was lacking in our cases, these nodules may be of nonaggressive nature. [ABSTRACT FROM AUTHOR]

Published
2009
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48. Gynaecology. Value of magnetic resonance imaging in predicting efficacy of GnRH analogue treatment for uterine leiomyoma

Author

Takahashi, Kentaro, Okada, Masako, Imaoka, Izumi, Sugimura, Kazuro, and Miyazaki, Kohji

Abstract

BACKGROUND: Estimating pharmacological efficacy is important when selecting conservative treatment of uterine leiomyoma. Hence, the ability of magnetic resonance (MR) imaging to predict gonadotrophin-releasing hormone (GnRH) analogue efficacy was investigated. METHODS: A total of 85 lesions was studied in 40 patients who were clinically diagnosed as having uterine leiomyoma and treated with GnRH analogue for 24 weeks. To evaluate changes in lesion size, T2-weighted and gadopentetate-dimeglumine (Gd-DTPA)-enhanced, T1-weighted MR images were obtained within 2 weeks before, and immediately after termination of, GnRH analogue treatment. RESULTS: An average 46.3% size reduction was observed in 45 lesions (52.9%); these were seen as low signal intensity on T2-weighted images and enhanced by Gd-DTPA. Also, an average 44.7% size reduction was observed in lesions enhanced by Gd-DTPA, irrespective of signal intensity findings on T2-weighted images. The average size reduction of unenhanced lesions was only 17.8%, and significantly different from enhanced lesions (P < 0.001). The prediction of efficacy was difficult in those lesions not enhanced. CONCLUSIONS: It is considered that evaluation of MR signal intensities, and the presence or absence of Gd-DTPA enhancement, would predict treatment efficacy before GnRH analogue administration.

Published
2001

49. T2* relaxometry mapping of the uterine zones

Author

Imaoka, Izumi, Nakatsuka, Takayuki, Araki, Tetsuro, Katsube, Takashi, Okada, Masahiro, Kumano, Seishi, Ishii, Kazunari, Ashikaga, Ryuichiro, Okuaki, Tomoyuki, Van Cauteren, Marc, and Murakami, Takamichi

Abstract

BACKGROUND: Previous literature demonstrated that the T2* value of the uterine junctional zone was lower than that of peripheral myometrium by using BOLD MR imaging. We expect T2* mapping image may add more information to T2-weighted images of the uterine myometrium. PURPOSE: To evaluate whether T2* mapping software would reproduce the result of previous report, and to apply the software to benign uterine diseases. MATERIAL AND METHODS: Five healthy volunteers and 19 patients clinically suspected of having benign pelvic disease were imaged using a 1.5T MR system. All women were of reproductive age, and all provided informed consent. Sagittal T2* images using a multishot EPI sequence were obtained. T2* values were calculated and color T2* maps reconstructed using a T2* fitting tool. RESULTS: The uterine zones could be identified in all 24 examinations on the T2* maps. In addition, a thin "4th zone" was seen between the endometrium and the JZ (junctional zone) in 19 of 24 examinations. The T2* value of JZ was significantly lower than that of peripheral myometrium (PM) (P < 0.001). No significant difference in the T2* value of the JZ or of PM was noted between normal uterus and uterus with leiomyomas and/or adenomyosis. CONCLUSION: A quantitative T2* map can easily be obtained using the PRIDE software T2* fitting tool, and the software reproduces the result from previous report. T2* value of the junctional zone was lower than that of peripheral myometrium regardless of having benign myometrial diseases.

Published
1960
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50. Prognostic application of magnetic resonance imaging in patients with endometriomas treated with gonadotrophin-releasing hormone analogue.

Author

Takahashi, Kentaro, Okada, Saori, Okada, Masako, Kitao, Manabu, Imaoka, Izumi, Sugimura, Kazuro, Takahashi, K, Okada, S, Okada, M, Kitao, M, Imaoka, I, and Sugimura, K

Abstract

We evaluated the usefulness of magnetic resonance imaging (MRI) for assessing the response of patients with endometriomas to medical therapy. MRI was performed before and after treatment in 20 consecutive patients with at least one endometrioma with a maximal diameter >10 mm diagnosed by laparoscopy who received 900 microg of buserelin acetate daily for 6 months. Patients were categorized as good responders (group I, n = 13) and poor responders (group II, n = 7) depending on the results of a third-look laparoscopy performed 6 months after treatment. We determined the ratio of the signal intensity (SI) of the endometrioma to the SI of the gluteus maximus muscle on T2-weighted images [T2SI/M (muscle) SI] and the volume of the endometrium. The volume decreased by >50% in 61.5% of the good-response group and 57.1% of the poor-response group. There was no significant difference between the two groups. The T2SI/MSI decreased in 12 of 13 patients in group I but in only one of seven patients in group II, a significant difference (P < 0.05) between the two groups. In the good-response group, there was a positive linear correlation between the decrease in the volume of the endometrioma and the decrease in the T2SI/MSI after treatment (r = 0. 561, P < 0.05). Therefore, the T2SI/MSI determined from MR images may be useful in assessing the therapeutic response of patients with endometriomas. [ABSTRACT FROM AUTHOR]

Published
1996
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