 | 位藤 俊一 （イトウ トシカズ）
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Last Updated :2024/04/25
研究活動情報
論文
- Toshikazu Ito; Ei Ueno; Tokiko Endo; Kiyoka Omoto; Akira Kuwajima; Nobuyuki Taniguchi; Hiroko Tsunoda; Eriko Tohno; Hideyuki Hashimoto; Yasuhisa Fujimoto; Takanori WatanabeJournal of medical ultrasonics (2001) 50 3 331 - 339 2023年07月It is possible to appropriately diagnose non-mass abnormalities by elucidating ultrasound non-mass abnormality findings and sharing the concept. If non-mass abnormalities can be diagnosed early, the number of curable cases could increase, leading to fewer breast cancer deaths. The Japan Society of Ultrasonics in Medicine (JSUM) Terminology/Diagnostic Criteria Committee has classified non-mass abnormalities into five subtypes: hypoechoic area in the mammary gland, abnormalities of the ducts, architectural distortion, multiple small cysts, and echogenic foci without a hypoechoic area. We herein define the findings for each of these subtypes and present a summary of the JSUM guidelines on non-mass abnormalities of the breast generated based on those findings.
- Toshikazu Ito; Yoshifumi KomoikeJournal of medical ultrasonics (2001) 50 3 327 - 329 2023年07月
- Yoko Satoh; Kohei Hanaoka; Chihiro Ikegawa; Masamichi Imai; Shota Watanabe; Daisuke Morimoto-Ishikawa; Hiroshi Onishi; Toshikazu Ito; Yoshifumi Komoike; Kazunari IshiiDiagnostics (Basel, Switzerland) 13 6 2023年03月The performances of photomultiplier tube (PMT)-based dedicated breast positron emission tomography (PET) and silicon photomultiplier tube (SiPM)-based time-of-flight (TOF) PET, which is applicable not only to breast imaging but also to head imaging, were compared using a phantom study. A cylindrical phantom containing four spheres (3-10 mm in diameter) filled with 18F-FDG at two signal-to-background ratios (SBRs), 4:1 and 8:1, was scanned. The phantom images, which were reconstructed using three-dimensional list-mode dynamic row-action maximum likelihood algorithm with various β-values and post-smoothing filters, were visually and quantitatively compared. Visual evaluation showed that the 3 mm sphere was more clearly visualized with higher β and smaller post-filters, while the background was noisier; SiPM-based TOF-PET was superior to PMT-based dbPET in sharpness, smoothness, and detectability, although the background was noisier at the SBR of 8:1. Quantitative evaluation revealed that the detection index (DI) and recovery coefficient (CRC) of SiPM-based TOF-PET images were higher than those of PMT-based PET images, despite a higher background coefficient of variation (CVBG). The two organ-specific PET systems showed that a 3 mm lesion in the breast could be visualized at the center of the detector, and there was less noise in the SiPM-based TOF-PET image.
- Wataru Shinzaki; Hironobu Manabe; Michiyo Kubota; Hiroki Inui; Toshiya Hojo; Toshikazu Ito; Yoshihito Itani; Yoshifumi KomoikeSAGE open medical case reports 11 2050313X231177510 2023年Even though most local recurrences after autologous breast reconstruction occur in superficial tissue, they also occur in deep tissue in the reconstructed breast. A 49-year-old woman presented with a bloody discharge from the right nipple. Ultrasonography revealed a hypoechoic area in her right breast, which was diagnosed as ductal carcinoma in situ on histopathology. We performed nipple-sparing mastectomy and immediate reconstruction of the breast with a latissimus dorsi myocutaneous flap. At 6 years postoperatively, the patient presented with a palpable mass. Ultrasonography revealed a solid mass lesion subcutaneously in the right breast. Computed tomography revealed multiple enhanced solid mass lesions in the subcutaneous and deep tissues of the reconstructed breast. The mass in the deep tissue of the reconstructed breast was diagnosed as an invasive micropapillary carcinoma by biopsy. For local recurrence, we performed wide excision of the reconstructed breast. The masses in the subcutaneous and deep tissues of the reconstructed breast were diagnosed as invasive micropapillary carcinoma. Superficial recurrence was first detected by physical examination, and deep recurrence was later detected with further imaging. We present a case of local recurrences that occurred in the deep tissue, in addition to superficial tissue of the reconstructed breast.