Details of a Researcher - Yamada, Yoshitake

Papers - Yamada, Yoshitake

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【Q&Aでまとめる! 予後予測・治療効果予測の画像検査】胸部(呼吸器・循環器・乳腺)　慢性血栓塞栓性肺高血圧症の画像的予後因子は何か?

奥田茂男, 田村全, 山田祥岳, 岩渕雄, 松本俊亮, 川上崇史, 陣崎雅弘

臨床放射線 (金原出版(株)) 65 ( 8 ) 847 - 857 2020.08

ISSN 0009-9252

Differences in Lung and Lobe Volumes between Supine and Standing Positions Scanned with Conventional and Newly Developed 320-Detector-Row Upright CT: Intra-Individual Comparison.

Yoshitake Yamada, Minoru Yamada, Yoichi Yokoyama, Akiko Tanabe, Shiho Matsuoka, Yuki Niijima, Keiichi Narita, Takehiro Nakahara, Mitsuru Murata, Koichi Fukunaga, Shotaro Chubachi, Masahiro Jinzaki

Respiration; international review of thoracic diseases (Respiration) 99 ( 7 ) 1 - 8 2020.07

Accepted, ISSN 0025-7931

© 2020 Background: No clinical studies to date have compared unilateral lung or lobe volumes between the supine and standing positions. Objectives: To compare lung/lobe volumes on computed tomography (CT) between these two positions and evaluate the correlation between the total lung volume and total lung capacity (TLC) on pulmonary function tests (PFTs). Methods: Thirty-two asymptomatic volunteers underwent both conventional CT (supine position) and upright CT (standing position), during deep inspiration breath-hold, and PFTs on the same day. We measured lung/lobe volumes on CT in each position. Paired t tests were used for statistical analysis. Results: The volumes of the total lung (10.9% increase), right lung (10.3% increase), right upper lobe (8.6% increase), right lower lobe (14.6% increase), left lung (11.6% increase), left upper lobe (7.1% increase), and left lower lobe (16.0% increase) were significantly greater in the standing position than in the supine position (all p < 0.0001). The right middle lobe volume was similar between the two positions (p = 0.16). Intraclass correlation coefficients for agreement between total lung volumes on CT in the supine/standing positions and the TLC on PFT were 0.891/0.938, respectively. Conclusions: While the volumes of the bilateral upper and lower lobes and bilateral lungs were significantly greater in the standing than in the supine position, with lower lobes showing larger changes, the right middle lobe volume did not change significantly between positions. The total lung volume on upright CT in the standing position was more similar to TLC on PFT than that in the supine position.

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Sinking skin flap syndrome visualized by upright computed tomography.

Yoshida K, Toda M, Yamada Y, Yamada M, Yokoyama Y, Fujiwara H, Kosugi K, Fukumura M, Koike K, Takahashi S, Yoshida K, Jinzaki M

Acta neurochirurgica (Acta Neurochirurgica) 2020.06

Research paper (scientific journal), Joint Work, Accepted, ISSN 0001-6268

© 2020, Springer-Verlag GmbH Austria, part of Springer Nature. Sinking skin flap syndrome is a craniectomy complication characterized by new neurological dysfunction that typically worsens in the upright position and improves after cranioplasty. We present a 33-year-old man who experienced hemiparesis in the upright position after craniectomy. Upright computed tomography (CT) before cranioplasty showed a remarkable shift of the brain compared to supine CT. After cranioplasty, both symptoms and brain shift on CT resolved. Upright CT enables detection and objective evaluation of paradoxical herniation and midline shift that is not obvious on supine imaging modalities. Clinicians need to be aware of positional brain shift in postcraniectomy patients.

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Pelvic floor morphology in the standing position using upright computed tomography: age and sex differences.

Keiichi Narita, Yoshitake Yamada, Minoru Yamada, Yoichi Yokoyama, Takehiro Nakahara, Masahiro Jinzaki

International urogynecology journal (Springer Science and Business Media {LLC}) 31 ( 11 ) 2387 - 2393 2020.06

Research paper (scientific journal), Joint Work, Accepted, ISSN 0937-3462

INTRODUCTION AND HYPOTHESIS: This study was aimed at comparing pelvic floor parameters between the standing and supine positions using upright computed tomography (CT) and evaluating the effects of sex and age in normal healthy volunteers. METHODS: In total, 139 volunteers (70 men, mean 46.7 years; 69 women, mean 47.3 years) underwent both upright CT in the standing position and conventional CT in the supine position. The distances from the bladder neck to the pubococcygeal line (PCL) and anorectal junction (ARJ), defined as the posterior aspect of the puborectalis muscle, to PCL were measured. The length, width, and area of the levator hiatus (LH) were measured on oblique axial images. RESULTS: The bladder neck (men, 22.2 ± 4.9 mm vs 28.3 ± 5.3 mm; women, 9.0 ± 5.1 mm vs 19.0 ± 4.0 mm) and ARJ (men, -18.8 ± 5.5 mm vs -12.1 ± 5.1 mm; women, -20.0 ± 4.7 mm vs -11.2 ± 4.3 mm) were significantly lower in the standing position than in the supine position (all p < 0.0001). The LH area (men, 1,990 ± 380 mm2 vs 1,697 ± 329 mm2; women, 2,284 ± 344 mm2 vs 1,811 ± 261 mm2) was significantly larger in the standing position (both p < 0.0001). Differences in all parameters between the standing and supine positions were larger in women than in men. ARJ in women showed a significant tendency to descend with age only in the standing position (r = -0.29, p = 0.017). CONCLUSIONS: The bladder neck and ARJ descend and the LH area enlarges in the standing position. Pelvic floor mobility is greater in women than in men. Descent of the ARJ in the standing position is associated with aging in women.

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Traction Bronchiectasis/Bronchiolectasis is Associated with Interstitial Lung Abnormality Mortality.

Hida T, Nishino M, Hino T, Lu J, Putman RK, Gudmundsson EF, Araki T, Valtchinov VI, Honda O, Yanagawa M, Yamada Y, Hata A, Jinzaki M, Tomiyama N, Honda H, Estepar RSJ, Washko GR, Johkoh T, Christiani DC, Lynch DA, Gudnason V, Gudmundsson G, Hunninghake GM, Hatabu H

European journal of radiology (European Journal of Radiology) 129 109073 - 109073 2020.05

Research paper (scientific journal), Joint Work, Accepted, ISSN 0720-048X

© 2020 Elsevier B.V. Purpose: To investigate if the presence and severity of traction bronchiectasis/bronchiolectasis are associated with poorer survival in subjects with ILA. Method: The study included 3,594 subjects (378 subjects with ILA and 3,216 subjects without ILA) in AGES-Reykjavik Study. Chest CT scans of 378 subjects with ILA were evaluated for traction bronchiectasis/bronchiolectasis, defined as dilatation of bronchi/bronchioles within areas demonstrating ILA. Traction bronchiectasis/bronchiolectasis Index (TBI) was assigned as: TBI = 0, ILA without traction bronchiectasis/bronchiolectasis: TBI = 1, ILA with bronchiolectasis but without bronchiectasis or architectural distortion: TBI = 2, ILA with mild to moderate traction bronchiectasis: TBI = 3, ILA and severe traction bronchiectasis and/or honeycombing. Overall survival (OS) was compared among the subjects in different TBI groups and those without ILA. Results: The median OS was 12.93 years (95%CI; 12.67 – 13.43) in the subjects without ILA; 11.95 years (10.03 – not reached) in TBI-0 group; 8.52 years (7.57 – 9.30) in TBI-1 group; 7.63 years (6.09 – 9.10) in TBI-2 group; 5.40 years (1.85 – 5.98) in TBI-3 group. The multivariable Cox models demonstrated significantly shorter OS of TBI-1, TBI-2, and TBI-3 groups compared to subjects without ILA (P < 0.0001), whereas TBI-0 group had no significant OS difference compared to subjects without ILA, after adjusting for age, sex, and smoking status. Conclusions: The presence and severity of traction bronchiectasis/bronchiolectasis are associated with shorter survival. The traction bronchiectasis/bronchiolectasis is an important contributor to increased mortality among subjects with ILA.

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Spatial resolution compensation by adjusting the reconstruction kernels for iterative reconstruction images of computed tomography.

Koichi Sugisawa, Katsuhiro Ichikawa, Atsushi Urikura, Kazuya Minamishima, Shota Masuda, Takashi Hoshino, Akiko Nakahara, Yoshitake Yamada, Masahiro Jinzaki

Physica medica : PM : an international journal devoted to the applications of physics to medicine and biology : official journal of the Italian Association of Biomedical Physics (AIFB) (Elsevier {BV}) 74 47 - 55 2020.05

Research paper (scientific journal), Joint Work, Accepted, ISSN 1120-1797

PURPOSE: Hybrid iterative reconstruction (IR) is useful to reduce noise in computed tomography (CT) images. However, it often decreases the spatial resolution. The ability of high spatial resolution kernels (harder kernels) to compensate for the decrease in the spatial resolution of hybrid IRs was investigated. METHODS: An elliptic cylindrical phantom simulating an adult abdomen was used. Two types of rod-shaped objects with ~330 and ~130 HU were inserted to simulate contrasts of arteries in CT angiography. Two multi-slice CT systems were used to scan the phantoms with 120 kVp and scan doses of 20 and 10 mGy. The task transfer functions (TTFs) were measured from the circular edges of the rod images. The noise power spectrum (NPS) was measured from the images of the water-only section. The CT images were reconstructed using a filtered back projection (FBP) with baseline kernels and two levels of hybrid IRs with harder kernels. The profiles of the clinical images across the aortic dissection flaps were measured to evaluate actual spatial resolutions. RESULTS: The TTF degradation of each hybrid IR was recovered by the harder kernels, whereas the noise reduction effect was retained, for both the 20 and 10 mGy. The profiles of the dissection flaps for the FBP were maintained by using the harder kernels. Even with the best combination of hybrid IR and harder kernel, the noise level at 10 mGy was not reduced to the level of FBP at 20 mGy, suggesting no capability of a 50% dose reduction while maintaining noise.

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Calcium density of the coronary artery: multi-image analysis using human cadaver

Minoru Yamada, Takehiro Nakahara, Yoshitake Yamada, Nobuaki Imanishi, Toshiyuki Nishimaki, Motoyuki Ogawa, Masahiro Jinzaki

JOURNAL OF ANATOMY 236 358 - 358 2020.04

ISSN 0021-8782

Successful depiction of systemic collateral supply to pulmonary artery in CTEPH using time-resolved 4D CT angiography: a case report.

Masashi Tamura, Takashi Kawakami, Yoshitake Yamada, Masaharu Kataoka, Seishi Nakatsuka, Keiichi Fukuda, Masahiro Jinzaki

Pulmonary circulation (Pulmonary Circulation) 10 ( 2 ) 2045894019881065 - 2045894019881065 2020.04

Accepted, ISSN 2045-8932

© The Author(s) 2020. A 49-year-old man with CTEPH (pre-procedural mean pulmonary artery pressure: 36 mmHg) underwent balloon pulmonary angioplasty. Chronic total occlusion of the left inferior pulmonary artery trunk was observed. To evaluate the collateral vessels of the chronic total occlusion, 4D-CTA was performed. The examination was performed using a 256-row detector CT system using the test bolus tracking method. 4D-CTA showed the bronchial artery-to-left inferior pulmonary artery collateral supply, which was confirmed by a selective bronchial artery angiography. The patient’s symptoms improved with balloon pulmonary angioplasty of the other stenotic lesions. 4D-CTA can noninvasively evaluate the anatomy and hemodynamics of multiple systemic collaterals simultaneously. This technique can support interventions in systemic artery-to-pulmonary artery collaterals, such as embolization, and could be helpful in challenging balloon pulmonary angioplasty interventions for chronic total occlusion to identify vessel structures distal to the chronic total occlusion and collateral channels for a retrograde approach.

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Ultrasound evaluation of complications after cardiovascular surgery in pediatric patients: A case series.

Takahiro Hosokawa, Sio Suzuki, Yutaka Tanami, Yumiko Sato, Yoshihiro Ko, Koji Nomura, Eiji Oguma, Yoshitake Yamada

Medical ultrasonography (Medical Ultrasonography) 22 ( 1 ) 110 - 115 2020.03

Joint Work, Accepted, ISSN 1844-4172

In contrast to computed tomography, ultrasound can be performed without radiation exposure, repeatedly performed by the patients' bedside. Hence, in this case series, we describe the evaluation of complications including hematoma, superficialsurgical site infection, mediastinitis, and pseudoaneurysm associated mediastinitis using ultrasound in pediatric patients after cardiovascular surgery. To our knowledge, no previous reports have evaluated such complications using ultrasound. Ultrasound may be useful for the early diagnosis of these complications, and in the selection of subsequent examinations such as computed tomography, resulting in the early initiation of intervention.

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【胸部の最新画像情報2020】肺野の画像所見が診断の契機となったEhlers-Danlos症候群の1例

松本晋作, 杉浦弘明, 南康大, 山田祥岳, 渡辺理沙, 福永興壱, 陣崎雅弘

臨床放射線 (金原出版(株)) 65 ( 1 ) 67 - 70 2020.01

ISSN 0009-9252

症例は40歳代女性で、胸痛を主訴に近医を受診し、胸部単純X線で左気胸を指摘され当院へ紹介入院となった。胸部単純CTにて左気胸を認めた。両肺底部に複数の不整な嚢胞、両下葉に浸潤影、小葉中心性陰影および気管支拡張を認めた。なお、約1年前の肺炎時のCTでは嚢胞は認められなかった。胸腔ドレーンを留置するも気胸およびリークの改善を認めなかったため、胸腔鏡下左肺下葉嚢胞切除術を施行した。術後経過は良好で、術後約1週間で退院した。比較的若年者に繰り返す肺炎後に不整な嚢胞が散見され、難治性の気胸を発症したことから肺組織の脆弱性が示唆され、基礎疾患としてEhlers-Danlos症候群の可能性が疑われた。遺伝子検査ではCOL5A2遺伝子変異が陽性(ミスセンス変異)であり、古典型Ehlers-Danlos症候群と診断された。また、COL3A1遺伝子変異は陰性であったことから、血管型Ehlers-Danlos症候群は否定された。

Projected lung areas using dynamic X-ray (DXR).

Takuya Hino, Akinori Hata, Tomoyuki Hida, Yoshitake Yamada, Masako Ueyama, Tetsuro Araki, Takeshi Kamitani, Mizuki Nishino, Atsuko Kurosaki, Masahiro Jinzaki, Kousei Ishigami, Hiroshi Honda, Hiroto Hatabu, Shoji Kudoh

European journal of radiology open (European Journal of Radiology Open) 7 100263 - 100263 2020

Accepted, ISSN 2352-0477

Background: Dynamic X-ray (DXR) provides images of multiple phases of breath with less radiation exposure than CT. The exact images at end-inspiratory or end-expiratory phases can be chosen accurately. Purpose: To investigate the correlation of the projected lung area (PLA) by dynamic chest X-ray with pulmonary functions. Material and Methods: One hundred sixty-two healthy volunteers who received medical check-ups for health screening were included in this study. All subjects underwent DXR in both posteroanterior (PA) and lateral views and pulmonary function tests on the same day. All the volunteers took several tidal breaths before one forced breath as instructed. The outlines of lungs were contoured manually on the workstation with reference to the motion of diaphragm and the graph of pixel values. The PLAs were calculated automatically, and correlations with pulmonary functions and demographic data were analyzed statistically. Results: The PLAs have correlation with physical characteristics, including height, weight and BMI, and pulmonary functions such as vital capacity (VC) and forced expiratory volume in one second (FEV1). VC and FEV1 revealed moderate correlation with the PLAs of PA view in forced inspiratory phase (VC: right, r = 0.65; left, r = 0.69. FEV1: right, r = 0.54; left, r = 0.59). Multivariate analysis showed that body mass index (BMI), sex and VC were considered independent correlation factors, respectively. Conclusion: PLA showed statistically significant correlation with pulmonary functions. Our results indicate DXR has a possibility to serve as an alternate method for pulmonary function tests in subjects requiring contact inhibition including patients with suspected or confirmed covid-19.

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Complications after surgical correction of anorectal malformations

Hosokawa T., Yamada Y., Tanami Y., Sato Y., Tanaka Y., Kawashima H., Oguma E.

Hong Kong Journal of Radiology (Hong Kong Journal of Radiology) 23 ( 3 ) 176 - 184 2020

ISSN 22236619

© 2020 Hong Kong Academy of Medicine Press. All rights reserved. Radiologists are often unfamiliar with anorectal malformations and have limited knowledge of the surgical procedures for their repair. In this article, we provide a comprehensible description of the surgical procedures for radiologists, review previous literature, and summarise the incidence of the complications. Moreover, we detail major postoperative complications consequent to the use of various imaging techniques, including anorectal prolapse, anal stenosis, urethral injury, posterior urethral diverticulum, neurogenic bladder, adhesion of reconstructed vagina, leakage from suture lines, and trocar site hernia. Knowledge of these complications and surgical procedures is important to radiologists for diagnosis and determination of a treatment strategy.

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Peripheral pulmonary stenosis with Noonan syndrome treated by balloon pulmonary angioplasty.

Seien Ko, Jin Komuro, Yoshinori Katsumata, Yasuyuki Shiraishi, Takashi Kawakami, Yoshitake Yamada, Shinsuke Yuasa, Takashi Kohno, Kenjiro Kosaki, Keiichi Fukuda

Pulmonary circulation (Pulmonary Circulation) 10 ( 4 ) 2045894020954310 - 2045894020954310 2020

Accepted, ISSN 20458932

© The Author(s) 2020. Noonan syndrome is known to have various cardiovascular defects, which include pulmonary artery stenosis. Pulmonary artery stenosis is characterized by obstruction of pulmonary artery blood flow that can cause elevated pulmonary artery pressure and ventilation-perfusion inequality, which can cause dyspnea on exertion and eventually, heart failure. Although the etiology of pulmonary artery stenosis related to congenital diseases is still unknown, balloon pulmonary angioplasty has being reported to be effective to selected patients with Alagille and Williams syndromes, but not from Noonan syndrome despite of modest prevalence of pulmonary artery stenosis. Here, we report the first Noonan syndrome patient with pulmonary artery stenosis who underwent successful balloon pulmonary angioplasty. The strategy used in balloon pulmonary angioplasty was planned with careful morphologic evaluation by computed tomographic angiography, and performed with scoring balloons in a graded approach with multiple sessions. After balloon pulmonary angioplasty, we confirmed maintained dilation of lesions and symptom alleviation, suggesting that balloon pulmonary angioplasty can be performed safely on pulmonary artery stenosis in a Noonan syndrome patient.

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Computed tomography findings of mediastinitis after cardiovascular surgery.

Takahiro Hosokawa, Yoshitake Yamada, Yutaka Tanami, Yumiko Sato, Yoshihiro Ko, Koji Nomura, Eiji Oguma

Pediatrics international : official journal of the Japan Pediatric Society (Wiley) 62 ( 2 ) 206 - 213 2019.12

Research paper (scientific journal), Joint Work, Accepted, ISSN 1328-8067

BACKGROUND: To our knowledge, no systematic study has been conducted on computed tomography (CT) imaging of mediastinitis in children post-cardiovascular surgery. We aimed to assess the CT findings of pediatric patients diagnosed with mediastinitis after cardiovascular surgery. METHODS: We included 28 pediatric patients with suspected mediastinitis after undergoing cardiovascular surgery and who underwent CT. Patients were divided into a group with mediastinitis requiring antibiotic therapy (n = 15) confirmed by positive bacterial culture from the mediastinum and a group without mediastinitis (n = 13). Fisher's exact test was used to compare the following CT findings between the two groups: (i) mediastinal fluid collection; (ii) free gas bubble within fluid collection; (iii) sternal destruction; and (iv) capsular ring enhancement. The enhancement extent was categorized into the following four grades: whole rim enhancement, >50% of the rim enhancement, <50% of the rim enhancement, and no rim enhancement. A receiver operating characteristic curve analysis was performed to establish a cut-off point for obtaining the maximum diagnostic accuracy. RESULTS: A significant difference was observed between patients, with and without mediastinitis in sternal destruction (73.6% vs 0%, P = <0.0001) and capsular ring enhancement (100.0% vs 38.5%, P = 0.0004). By using a cut-off grade of the whole rim enhancement, the estimated sensitivity and specificity for mediastinitis diagnosis were 100% and 92.3%, respectively. CONCLUSION: Computed tomography findings of sternal destruction and capsular ring enhancement were observed more in patients with mediastinitis than in those without mediastinitis, and should be assessed carefully to diagnose mediastinitis accurately in pediatric patients who have undergone cardiac surgery.

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Ultrasound Evaluation of Dermal Sinuses/Fistulas in Pediatric Patients.

Hosokawa T, Takahashi H, Miyasaka Y, Ohira K, Tanami Y, Sato Y, Ishimaru T, Kawashima H, Hosokawa M, Oguma E, Yamada Y

Journal of ultrasound in medicine : official journal of the American Institute of Ultrasound in Medicine (Journal of ultrasound in medicine : official journal of the American Institute of Ultrasound in Medicine) 38 ( 12 ) 3107 - 3122 2019.12

ISSN 0278-4297

© 2019 by the American Institute of Ultrasound in Medicine. A dermal sinus/fistula is a common condition; the relevant department should be consulted for appropriate treatment. It is important for radiologists to have adequate knowledge of these conditions to provide the correct diagnosis and recommend subsequent management. This review describes the following lesions: preauricular sinus, midline sinus of the upper lip, nasal dermoid sinus cyst, cheek fistula, first branchial cleft anomaly/sublingual branchial cleft anomaly, thyroglossal duct cyst/fistula, lateral cervical sinus/fistula, congenital dermal sinus/fistula of the anterior chest region, congenital skin sinus/fistula with a sternal cleft, and congenital prepubic sinus. On the basis of the skin orifice location and ultrasound images, radiologists can provide useful information to physicians.

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Four-Dimensional CT Analysis Using Sequential 3D-3D Registration.

Satoshi Oki, Kazuya Kaneda, Yoshitake Yamada, Minoru Yamada, Yutaro Morishige, Kengo Harato, Noboru Matsumura, Takeo Nagura, Masahiro Jinzaki

Journal of visualized experiments : JoVE (Journal of visualized experiments : JoVE) 2019 ( 153 ) 2019.11

Research paper (scientific journal), Joint Work, Accepted, ISSN 1940-087X

Four-dimensional computed tomography (4DCT) provides a series of volume data and visualizes joint motions. However, numerical analysis of 4DCT data remains difficult because segmentation in all volumetric frames is time-consuming. We aimed to analyze joint kinematics using a sequential 3D-3D registration technique to provide the kinematics of the moving bone with respect to the fixed bone semiautomatically using 4DCT DICOM data and existing software. Surface data of the source bones are reconstructed from 3DCT. The trimmed surface data are respectively matched with surface data from the first frame in 4DCT. These trimmed surfaces are sequentially matched until the last frame. These processes provide positional information for target bones in all frames of the 4DCT. Once the coordinate systems of the target bones are decided, translation and rotation angles between any two bones can be calculated. This 4DCT analysis offers advantages in kinematic analyses of complex structures such as carpal or tarsal bones. However, fast or large-scale motions cannot be traced because of motion artifacts.

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Three-dimensional kinematic change of hindfoot during full weightbearing in standing: an analysis using upright computed tomography and 3D-3D surface registration.

Kaneda K, Harato K, Oki S, Ota T, Yamada Y, Yamada M, Matsumoto M, Nakamura M, Nagura T, Jinzaki M

Journal of orthopaedic surgery and research (Journal of orthopaedic surgery and research) 14 ( 1 ) 355 2019.11

BACKGROUND: Weightbearing of the hindfoot affects positional changes of the ankle joint and subtalar joint (ankle-joint complex [AJC]). However, it is difficult to assess the kinematic changes in the hindfoot in a natural full weightbearing condition using conventional CT or cone beam computed tomography (CT) due to limitations of acquiring foot images under a physiological weightbearing condition using those imaging modalities. Analysis of AJC kinematics using fluoroscopy and 2D-3D registration technique requires data on the number of steps and amount of time to build and match the bones. This study aimed to analyze the effect of full weightbearing on hindfoot motion when standing using upright CT and 3D-3D surface registration. METHODS: Forty-eight AJCs of 24 asymptomatic volunteers (13 women, 11 men) were examined under no weightbearing, 50% weightbearing, and single leg full weightbearing conditions while standing. The CT images were acquired from the distal femur to the whole foot using a 320-row upright CT scanner. The condition of each weightbearing stance was measured using a pressure mat. Bone-to-bone rotations of the talus relative to the tibia and calcaneus relative to the talus were evaluated using the surface registration technique. Image quality of the CT and intra- and interobserver reliabilities of the rotation angle were also evaluated. RESULTS: All CT images were excellent or good quality and the intra- and interobserver correlation coefficients for the angle were 0.996 and 0.995, respectively. The motion of the ankle joint and subtalar joint under 50% and 100% weightbearing were as follows (in degrees); the talus plantarflexed (5.1 ± 4.5 and 6.8 ± 4.8), inverted (1.3 ± 1.4 and 2.0 ± 1.6), and internally rotated (2.4 ± 4.2 and 4.3 ± 4.6) relative to the tibia, and the calcaneus dorsiflexed (2.8 ± 1.4 and 3.8 ± 1.7), everted (5.3 ± 2.6 and 8.0 ± 3.6), and externally rotated (3.0 ± 2.0 and 4.1 ± 2.4) relative to the talus, respectively. CONCLUSIONS: The effect of weightbearing was clearly identified using an upright CT and the 3D-3D registration technique. Three-dimensional kinematics under static full weightbearing were opposite between the ankle and subtalar joints on their respective axes.

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Usefulness of contrast-enhanced ultrasonography for diagnosis of renal cell carcinoma in dialysis patients: Comparison with computed tomography.

Hashimoto M, Ohkuma K, Akita H, Yamada Y, Nakatsuka S, Mizuno R, Oya M, Jinzaki M

Medicine 98 ( 47 ) e18053 2019.11

ISSN 0025-7974

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Myocardial T1 values in healthy volunteers measured with saturation method using adaptive recovery times for T1 mapping (SMART1Map) at 1.5 T and 3 T.

Matsumoto S, Okuda S, Yamada Y, Suzuki T, Tanimoto A, Nozaki A, Jinzaki M

Heart and vessels (Heart and Vessels) 34 ( 11 ) 1889 - 1894 2019.11

ISSN 0910-8327

© 2019, Springer Japan KK, part of Springer Nature. Myocardial T1 mapping is clinically valuable for assessing the myocardium, and modified look-locker inversion-recovery (MOLLI) approaches have been commonly used for measuring myocardial T1 values. To date, several other sequences have been developed for measuring myocardial T1 values, and saturation-recovery-based sequences have been shown to be less dependent on various factors, such as T2 times and magnetization transfer, than inversion-recovery techniques. Systematic differences in T1 values between different sequences have been reported; therefore, definition of the normal range of native T1 values is required before clinical usage can begin. The purpose of this study was to evaluate the reference range and sex dependency of native T1 values in the myocardium measured using one such saturation-recovery sequence, i.e., saturation method using adaptive recovery times for cardiac T1 mapping (SMART1Map). Myocardial T1 values were compared between SMART1Map and MOLLI in 24 young healthy volunteers at 1.5 T and 3 T, and differences in the T1 values between the sexes were assessed. The mean native T1 values in the myocardium were significantly longer with SMART1Map than MOLLI [1530.4 ± 49.2 vs 1222.1 ± 48.9 ms at 3 T (p < 0.001) and 1227.3 ± 41.9 ms vs 1014.8 ± 49.4 ms at 1.5 T (p < 0.001)]. A significant difference between the sexes was observed in the T1 values obtained using each sequence, excluding SMART1Map at 3 T. The SMART1Map has a potential advantage to overcome the shortcoming of MOLLI, which underestimates T1 values; however, the sex-dependent difference remains obscure using SMART1Map.

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Use of CT in a standing position for preoperative evaluation in abdominal incisional hernia: A pilot study.

Sakamoto Y, Yamada M, Yamada Y, Yokoyama Y, Kishi K, Jinzaki M

Journal of plastic, reconstructive & aesthetic surgery : JPRAS 2019.10

ISSN 1748-6815

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