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  1. Article ; Online: Diagnostic Utility of Double-Echo Steady-State (DESS) MRI for Fracture and Bone Marrow Edema Detection in Adolescent Lumbar Spondylolysis

    Atsushi Kitakado / Takeshi Fukuda / Jiro Kobayashi / Hiroya Ojiri

    Diagnostics, Vol 13, Iss 461, p

    2023  Volume 461

    Abstract: To evaluate the ability of double-echo steady-state (DESS) MRI to detect pars interarticularis fracture and bone marrow edema (BME) in spondylolysis, 500 lumber pars interarticularis from 50 consecutive patients (38 males and 12 females, mean age 14.2 ± ... ...

    Abstract To evaluate the ability of double-echo steady-state (DESS) MRI to detect pars interarticularis fracture and bone marrow edema (BME) in spondylolysis, 500 lumber pars interarticularis from 50 consecutive patients (38 males and 12 females, mean age 14.2 ± 3.28 years) with spondylolysis who underwent both MRI and CT within 1 week were evaluated. All participants were young athletes who complained of lower back pain. Fractures were classified into four grades and CT was used as a reference; BME was evaluated in a binary manner and STIR was used as a reference. The diagnostic performance of fractures on DESS and T1WI, and BME on DESS was assessed by two radiologists independently. For fracture detection, DESS showed high diagnostic performance at a sensitivity of 94%, specificity of 99.5%, and accuracy of 98.8%, whereas T1WI showed lower sensitivity (70.1%). Fracture grading performed by DESS showed excellent agreement with CT grading (Kappa = 0.9). For BME, the sensitivity, specificity, and accuracy of DESS were 96.5%, 100%, and 99.6%, respectively. The inter-rater agreement of DESS for fracture and BME was 0.8 and 0.85, respectively. However, the inter-rater agreement for fracture on T1WI was 0.52. DESS had high diagnostic performance for fracture and BME in pars interarticularis. In conclusion, DESS had potential to detect all critical imaging findings in spondylolysis and may replace the role of CT.
    Keywords spondylolysis ; pars interarticularis ; fracture ; bone marrow edema ; magnetic resonance imaging ; computed tomography ; Medicine (General) ; R5-920
    Language English
    Publishing date 2023-01-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Quantitative biomarkers for distinguishing bone metastasis and benign bone marrow lesions using turbo spin echo T1- and T2-weighted Dixon imaging at 3.0 T

    Sho Ogiwara / Takeshi Fukuda / Takenori Yonenaga / Akira Ogihara / Hiroya Ojiri

    European Journal of Radiology Open, Vol 11, Iss , Pp 100541- (2023)

    2023  

    Abstract: Objective: To assess the diagnostic performance and calculate the optimal threshold for quantitative biomarkers to differentiate bone metastasis and benign bone marrow lesions using turbo spin echo (TSE) Dixon images with a 3.0 T scanner. Materials and ... ...

    Abstract Objective: To assess the diagnostic performance and calculate the optimal threshold for quantitative biomarkers to differentiate bone metastasis and benign bone marrow lesions using turbo spin echo (TSE) Dixon images with a 3.0 T scanner. Materials and methods: Each 100 patients diagnosed with bone metastases and variable benign bone marrow lesions on spine MRI were included retrospectively. Images included in-phase (IP), opposed-phase (OP), water images (WI), and fat images (FI) by the TSE Dixon technique with T1WI and T2WI using a 3.0 T scanner. Regions of interest (ROI) of the lesions were manually drawn by two musculoskeletal radiologists independently, and the average signal intensity was recorded. The signal reduction rate from IP to OP (%drop) and a fat fraction (%fat) were calculated. Results: All biomarkers showed a significant difference between metastatic and benign lesions (P < 0.001). When comparing the AUCs, the %drop of T1WI had the highest AUC (0.934). Although the AUC of %fat from T2WI was significantly lower than that of other biomarkers, the %drop of T2WI was not significantly different from the %drop of T1WI (p = 0.339). The optimal threshold of %drop to differentiate metastatic and benign lesions was 22.0 in T1WI and 15.9 in T2WI. The inter-reader agreement was excellent for all biomarkers (0.82–0.86). Conclusion: While %drop of T1WI showed the highest diagnostic performance to differentiate bone metastasis from benign lesions, the %drop of T2WI showed a comparable ability using a threshold 15.9.
    Keywords Magnetic resonance imaging ; Bone metastasis ; Dixon sequence ; Medical physics. Medical radiology. Nuclear medicine ; R895-920
    Subject code 616
    Language English
    Publishing date 2023-12-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Corrigendum to “Anatomical analysis of inflammation in hand psoriatic arthritis by Dual-Energy CT Iodine Map” 8 (2021) 100383

    Sho Ogiwara / Takeshi Fukuda / Reina Kawakami / Hiroya Ojiri / Kunihiko Fukuda

    European Journal of Radiology Open, Vol 9, Iss , Pp 100425- (2022)

    2022  

    Keywords Medical physics. Medical radiology. Nuclear medicine ; R895-920
    Language English
    Publishing date 2022-01-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Anatomical analysis of inflammation in hand psoriatic arthritis by Dual-Energy CT Iodine Map

    Sho Ogiwara / Takeshi Fukuda / Reina Kawakami / Hiroya Ojiri / Kunihiko Fukuda

    European Journal of Radiology Open, Vol 8, Iss , Pp 100383- (2021)

    2021  

    Abstract: Objective: This study aimed to identify the detailed location of inflammatory lesions and its frequency of hand PsA on DECT Iodine Map with referring the cadaveric specimen. Materials and methods: Thirty-eight anatomical landmarks were selected as a ... ...

    Abstract Objective: This study aimed to identify the detailed location of inflammatory lesions and its frequency of hand PsA on DECT Iodine Map with referring the cadaveric specimen. Materials and methods: Thirty-eight anatomical landmarks were selected as a potential inflammatory sites in the thumb and middle finger. We included 22 symptomatic PsA patients who underwent contrast enhanced DECT of the hand. MR images and macroscopic specimens of thumb and middle finger were prepared from a cadaver. Two musculoskeletal radiologists evaluated DECT with referring the cadaveric images to determine the precise location of inflammatory sites and its frequency. Results: The frequently observed inflammation sites of active PsA patients were either classical or functional entheses, and coincide with the well-known hypothesis that primary inflammatory sites of PsA are enthesis. We have noticed that there was remarkable enhancement around DIP joints (13.6 %–45.5 %). Conclusion: DECT could assess the detailed anatomical sites of the inflammatory lesion in hand psoriatic arthritis, which coincided with enthesis.
    Keywords Psoriatic arthritis ; Dual-Energy CT ; MRI ; Synovitis ; Enthesitis ; Medical physics. Medical radiology. Nuclear medicine ; R895-920
    Language English
    Publishing date 2021-01-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article ; Online: Correction to: Radiological approach for the newly incorporated T staging factor, depth of invasion (DOI), of the oral tongue cancer in the 8th edition of American Joint Committee on Cancer (AJCC) staging manual: assessment of the necessity for elective neck dissection.

    Baba, Akira / Hashimoto, Kazuhiko / Kayama, Reina / Yamauchi, Hideomi / Ikeda, Koshi / Hiroya Ojiri

    Japanese journal of radiology

    2020  Volume 39, Issue 1, Page(s) 100

    Language English
    Publishing date 2020-10-06
    Publishing country Japan
    Document type Published Erratum
    ZDB-ID 2488907-6
    ISSN 1867-108X ; 1867-1071
    ISSN (online) 1867-108X
    ISSN 1867-1071
    DOI 10.1007/s11604-020-01047-8
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Efficacy of Portal Vein Embolization with a Procedure of Sheath Injection and Balloon Occlusion with Gelatin Sponge

    Yosuke Nozawa / Hirokazu Ashida / Kenkichi Michimoto / Shunsuke Kisaki / Rui Kano / Hiroya Ojiri / Toru Ikegami

    Journal of the Belgian Society of Radiology, Vol 105, Iss

    2021  Volume 1

    Abstract: Introduction: To evaluate the efficacy, safety, and associated complications of a novel and simple approach to portal vein embolization that utilizes sheath injection and balloon occlusion (PVE-SIBO) with gelatin sponge (GS) for the purpose of increasing ...

    Abstract Introduction: To evaluate the efficacy, safety, and associated complications of a novel and simple approach to portal vein embolization that utilizes sheath injection and balloon occlusion (PVE-SIBO) with gelatin sponge (GS) for the purpose of increasing future liver remnant (FLR) volume. Methods: Between 1 January, 2006, and 31 August, 2020, 20 patients (15 men, 5 women, aged 64.6 ± 10.2 years) diagnosed with hepatobiliary malignancy underwent presurgical PVE-SIBO at our institution via a percutaneous transhepatic approach to the right portal vein and embolization of the portal vein with GS. We evaluated the increased ratio of FLR volume, operation duration, recanalization rate, and complications following this procedure. Results: All procedures were successful and without complications such as subcapsular hematoma, intra-abdominal bleeding, and bile leakage. The increased ratio of FLR volume was 34.7 ± 23.7% after a mean of 14.3 ± 2.57 days, and there was a significant difference in the FLR volume before and after PVE (P < 0.01). Procedure time was 52.7 ± 11.4 minutes. Conclusion: PVE-SIBO with GS is a simple, effective, and safe procedure to increase the ratio of FLR volume prior to hepatic surgeries.
    Keywords future liver remnant ; gelatin sponge ; hepatic resection ; portal vein embolization ; balloon occlusion ; Medical physics. Medical radiology. Nuclear medicine ; R895-920
    Subject code 616
    Language English
    Publishing date 2021-09-01T00:00:00Z
    Publisher Ubiquity Press
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Article ; Online: Successful treatment of spontaneous middle mediastinum hematoma due to rupture of bilateral bronchial artery with transcatheter arterial embolization using N-butyl-2-cyanoacrylate

    Koichi Masuda, MD / Shinsuke Takenaga, MD / Shinji Yamazoe, PhD, MD / Takuji Mogami, PhD, MD / Hiroya Ojiri, PhD, MD

    Radiology Case Reports, Vol 15, Iss 7, Pp 988-

    A case report

    2020  Volume 991

    Abstract: Mediastinum hematoma is often caused by chest trauma, aortic dissection, and tumor. Spontaneous nontraumatic middle mediastinum hematoma is a rare and potentially life-threatening condition. Here, we report the case of a patient who was a 46-year-old ... ...

    Abstract Mediastinum hematoma is often caused by chest trauma, aortic dissection, and tumor. Spontaneous nontraumatic middle mediastinum hematoma is a rare and potentially life-threatening condition. Here, we report the case of a patient who was a 46-year-old experienced sudden chest pain with spontaneous middle mediastinum hematoma caused by rupture of the bilateral bronchial artery. We successfully treated the patient with transcatheter arterial embolization via the bilateral bronchial artery using N-butyl-2-cyanoacrylate.
    Keywords Spontaneous mediastinum hematoma ; Rupture of bronchial artery ; N-butyl-2-cyanoacrylate ; Medical physics. Medical radiology. Nuclear medicine ; R895-920
    Language English
    Publishing date 2020-07-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article ; Online: Variceal bleeding in the small intestine successfully treated with balloon-occluded retrograde transvenous obliteration using N-butyl-2-cyanoacrylate

    Koichi Masuda, MD / Shinsuke Takenaga, MD / Hirokazu Ashida, MD / Hiroya Ojiri, PhD, MD

    Radiology Case Reports, Vol 13, Iss 2, Pp 400-

    A case report

    2018  Volume 403

    Abstract: Rupture of small intestinal varices associated with portal hypertension can be a serious condition that is difficult to diagnose early and to manage. Moreover, optimal guidelines for the treatment of small intestinal varices have not yet been established. ...

    Abstract Rupture of small intestinal varices associated with portal hypertension can be a serious condition that is difficult to diagnose early and to manage. Moreover, optimal guidelines for the treatment of small intestinal varices have not yet been established. We herein report a case of a 73-year-old man with small intestinal varices. The man presented with bleeding from a stoma in the small intestine, which subsequently led to hemorrhagic shock. We successfully treated the patient with balloon-occluded retrograde transvenous obliteration via the right inferior epigastric vein using N-butyl-2-cyanoacrylate. Keywords: Small intestinal varices, Balloon-occluded retrograde transvenous obliteration, N-butyl-2-cyanoacrylate
    Keywords Medical physics. Medical radiology. Nuclear medicine ; R895-920
    Language English
    Publishing date 2018-04-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  9. Article ; Online: Clinical impact of the Sherlock 3CG® Tip Confirmation System for peripherally inserted central catheters

    Tomomi Yamagishi / Hirokazu Ashida / Takao Igarashi / Yo Matsui / Yosuke Nozawa / Takahiro Higuchi / Hiroya Ojiri

    Journal of International Medical Research, Vol

    2018  Volume 46

    Abstract: Objective This study was performed to evaluate the technical success rate and catheter tip malposition rate of peripherally inserted central catheter (PICC) placement using the Sherlock 3CG® Tip Confirmation System (TCS). Methods In total, 114 patients ... ...

    Abstract Objective This study was performed to evaluate the technical success rate and catheter tip malposition rate of peripherally inserted central catheter (PICC) placement using the Sherlock 3CG® Tip Confirmation System (TCS). Methods In total, 114 patients who underwent PICC insertion via the Sherlock 3CG® TCS from October 2017 to February 2018 were retrospectively evaluated. The primary endpoints were the technical success rate, malposition rate, and mean procedure time. The secondary endpoints were the sex-related difference in the malposition rate, radiologist’s experience level, and side of insertion. Technical success was defined as procedure completion using only the Sherlock 3CG® TCS without a guidewire or fluoroscopy guidance. In accordance with the North American guidelines, an adequate position was defined as the lower third of the superior vena cava and the cavoatrial junction. Results The technical success rate was 97% (111/114). The malposition rate was 16% (18/111), and four catheters were repositioned. There were no significant differences in the malposition rate between the sexes, radiologist’s level of experience, or side of insertion. Conclusions PICC placement using the Sherlock 3CG® TCS yielded a high technical success rate and low catheter tip malposition rate regardless of the radiologist’s level of experience or side of insertion.
    Keywords Medicine (General) ; R5-920
    Language English
    Publishing date 2018-12-01T00:00:00Z
    Publisher SAGE Publishing
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  10. Article ; Online: A case of giant common hepatic artery aneurysm successfully treated by transcatheter arterial embolization with isolation technique via pancreaticoduodenal arcade

    Koichi Masuda, MD / Shinsuke Takenaga, MD / Kazuhiko Morikawa, MD / Hirokazu Ashida, MD / Hiroya Ojiri, PhD, MD

    Radiology Case Reports, Vol 14, Iss 2, Pp 195-

    2019  Volume 199

    Abstract: Hepatic artery aneurysms are rare and sometimes life-threating. Various treatments for hepatic artery aneurysms, including surgical and endovascular techniques are present. Here, we report the case of a 68-year-old woman who presented with an about 9 cm ... ...

    Abstract Hepatic artery aneurysms are rare and sometimes life-threating. Various treatments for hepatic artery aneurysms, including surgical and endovascular techniques are present. Here, we report the case of a 68-year-old woman who presented with an about 9 cm of common hepatic artery aneurysm detected during a routine medical checkup; she did not exhibit any symptoms. We successfully treated the aneurysm with transcatheter arterial embolization with isolation technique via pancreatic duodenal arcade. Keywords: Common hepatic artery aneurysm, Transcatheter arterial embolization, Isolation technique via pancreaticoduodenal arcade
    Keywords Medical physics. Medical radiology. Nuclear medicine ; R895-920
    Language English
    Publishing date 2019-02-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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