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Furukawa Mitsuru,Fujiyoshi Kanehiro,Okubo Toshiki,Yanai Yoshihide,Matsubayashi Kohei,Kato Takashi,Kobayashi Yoshiomi,Konomi Tsunehiko,Yato Yoshiyuki 대한척추외과학회 2023 Asian Spine Journal Vol.17 No.4
Study Design: This study adopted a cross-sectional study design.Purpose: This study was designed to investigate the effects of bone cross-link bridging on fracture mechanism and surgical outcomes in vertebral fractures using the maximum number of vertebral bodies with bony bridges between adjacent vertebrae without interruption (maxVB).Overview of Literature: The complex interplay of bone density and bone bridging in the elderly can complicate vertebral fractures, necessitating a better understanding of fracture mechanics.Methods: We examined 242 patients (age >60 years) who underwent surgery for thoracic to lumbar spine fractures from 2010 to 2020. Subsequently, the maxVB was classified into three groups: maxVB (0), maxVB (2–8), and maxVB (9–18), and parameters, including fracture morphology (new Association of Osteosynthesis classification), fracture level, and neurological deficits were compared. In a sub-analysis, 146 patients with thoracolumbar spine fractures were classified into the three aforementioned groups based on the maxVB and compared to determine the optimal operative technique and evaluate surgical outcomes.Results: Regarding the fracture morphology, the maxVB (0) group had more A3 and A4 fractures, whereas the maxVB (2–8) group had less A4 and more B1 and B2 fractures. The maxVB (9–18) group exhibited an increased frequency of B3 and C fractures. Regarding the fracture level, the maxVB (0) group tended to have more fractures in the thoracolumbar transition region. Furthermore, the maxVB (2–8) group had a higher fracture frequency in the lumbar spine area, whereas the maxVB (9–18) group had a higher fracture frequency in the thoracic spine area than the maxVB (0) group. The maxVB (9–18) group had fewer preoperative neurological deficits but a higher reoperation rate and postoperative mortality than the other groups.Conclusions: The maxVB was identified as a factor influencing fracture level, fracture type, and preoperative neurological deficits. Thus, understanding the maxVB could help elucidate fracture mechanics and assist in perioperative patient management.
A Location Map-Free Reversible Data Hiding Method Inserting Data to Image Edges
Michihiko ONO,Masaaki FUJIYOSHI,Hitoshi KIYA 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
This paper proposes a reversible data hiding method that embeds data to image edges. The proposed method once distorts an original image to embed data, it restores the original image as well as extracts hidden data from the image conveying hidden data. To extract data and to recover the original image, this method memorizes only one parameter and does not require any location map that records the positions conveying hidden data. Differing from the conventional method having these features, the proposed method is able to hide data to only image edges. Simulation results show the effectiveness of the proposed method.
Kimio Ushijima,Keizo Fujiyoshi,Kouichiro Kawano,Naotake Tsuda,Shin Nishio,Hidehiro Eto,Toshiharu Kamura 대한부인종양학회 2013 Journal of Gynecologic Oncology Vol.24 No.2
Objective: To evaluate the clinical efficacy of concurrent chemoradiotherapy (CCRT) using daily low-dose cisplatin for cervical cancer. Methods: Fifty-one patients with locally advanced cervical cancer (FIGO stage IB2, bulky IIA, IIB-IVA) who were treated with CCRT as primary therapy at Kurume University Hospital between 2000 and 2007 were retrospectively reviewed. CCRT consisted of 5 mg/m2/day of cisplatin 5 days per week, and external beam radiotherapy (EBRT) administrated to whole pelvis to 45-50.6 Gy. High-dose-rate intracavitary brachytherapy was delivered in a single dose of 4-5 Gy at point A, once a week after 20-30 Gy of EBRT. Results: The median follow-up duration was 42 months (range, 5 to 116 months). The overall response rate was 94.1%. Five year overall survival rate was 71.5% and 46.2% in stage I or II, and stage III or IVA, respectively. During follow-up period, 30 recurrences (58.8%) were found, the local failure rate was 39%, and distant failure rate was 35.2%, and both (local and distant) were 15.7%. Hematological toxicities were the most frequent acute toxicities. Grade 3 and 4 neutropenia was observed in 37.3%. Late intestinal toxicities appeared in 7 cases (13.7%), which occurred between 6 and 114 months after treatment. Four cases required bowel surgery. Conclusion: CCRT using daily low-dose cisplatin was tolerable and showed favorable initial response as the primary therapy for locally advanced uterine cervical cancer. But there was no remarkable long-term benefit for patients’ survival or local disease control in this study. The incidence of late intestinal toxicity still requires further investigation.
Improvement in the Image Quality and the Capacity of the Reversible Data Hiding
Hong Lin JIN,Masaaki FUJIYOSHI,Hitoshi KIYA 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
This paper proposes a reversible data hiding method in the spatial domain. A reversible data hiding method not only extracts hidden data from a stego image that conveys data but also restores the original image. The proposed method modulates pixel values adaptively and reversibly before an embedding process to improve the image quality of a stego image and simultaneously to increase the capacity. Simulation results show the effectiveness of the proposed method.
Reversible Data Hiding with Hierarchical Access Control for Medical Imagery
Seungwu HAN,Masaaki FUJIYOSHI,Haekwang KIM,Hitoshi KIYA 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
This paper proposes a reversible data hiding method for supporting hierarchical control of access to data embedded in a medical image. The proposed method firstly hides the most important information to a medical image by the reversible manner in which information is enciphered. To the stego image to which once information is hidden, this method embeds different information that is enciphered with a different key. In the proposed method, only one key corresponding to the most important data is managed, and other keys are generated from the managed key through a one-way hash function. The privileged user such as the attending doctor receives the managed key and he/she extracts and deciphers all hidden data, whereas the unprivileged user like an ordinary nurse receives a key that for the least important data. The proposed method also has tamper detection ability. Simulation results show the effectiveness of the proposed method.