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Japanese Journal of Radiology

Dongsheng Jiang, Weiqiang Dou, Luc Vosters, Xiayu Xu, Yue Sun, Tao Tan
PURPOSE: To test if the proposed deep learning based denoising method denoising convolutional neural networks (DnCNN) with residual learning and multi-channel strategy can denoise three dimensional MR images with Rician noise robustly. MATERIALS AND METHODS: Multi-channel DnCNN (MCDnCNN) method with two training strategies was developed to denoise MR images with and without a specific noise level, respectively. To evaluate our method, three datasets from two public data sources of IXI dataset and Brainweb, including T1 weighted MR images acquired at 1...
July 7, 2018: Japanese Journal of Radiology
Nobuyoshi Fukumitsu, Shinsei Takahashi, Toshiyuki Okumura, Toshiki Ishida, Keiko Nemoto Murofushi, Kayoko Ohnishi, Teruhito Aihara, Hitoshi Ishikawa, Koji Tsuboi, Hideyuki Sakurai
PURPOSE: Normal liver tissue changes after proton beam therapy (PBT) were investigated in patients at 1 and 2 years after the therapy. MATERIALS AND METHODS: Changes in normal liver tissue volume were examined. The dose distribution of the normal liver tissue was also simulated on the follow-up CTs. RESULTS: The normal liver tissue volume was 1149 ± 215 cm3 before treatment, 1089 ± 188 cm3 at 1 year, and 1080 ± 236 cm3 at 2 years after treatment...
July 6, 2018: Japanese Journal of Radiology
Takaaki Hasegawa, Takashi Yamanaka, Hideo Gobara, Masaya Miyazaki, Haruyuki Takaki, Yozo Sato, Yoshitaka Inaba, Koichiro Yamakado
PURPOSE: To compare the clinical outcomes between radiofrequency ablation (RFA) and cryoablation for the treatment of clinical T1b (cT1b) renal cell carcinoma (RCC). MATERIALS AND METHODS: The data of 46 patients [(39 men and 7 women, median age; 73 years, range 39-87 years)] were gathered from 3 institutions. RFA and cryoablation were performed on 23 patients each. The median number of ablation needle was 2 (range 1-4) and 4 (range 3-5, p < 0.0001) in RFA and cryoablation, respectively...
July 2, 2018: Japanese Journal of Radiology
Shuai Liu, Zheng Feng, Hao Wen, Zhaoxia Jiang, Herong Pan, Yu Deng, Lei Zhang, Xingzhu Ju, Xiaojun Chen, Xiaohua Wu
PURPOSE: This study aimed to explore the clinical and prognostic significance of 18 F-fluoro-2-deoxy-D-glucose positron emission tomography/computed tomography (18 F-FDG PET/CT) in epithelial ovarian cancer (EOC). METHODS: We retrospectively investigated 48 EOC patients who underwent preoperative 18 F-FDG PET/CT and primary cytoreductive surgery at our hospital between January 2010 and June 2015. None of these patients received neoadjuvant chemotherapy. PET/CT parameters including the maximum and average standardized uptake value (SUVmax, SUVavg), the metabolic tumor volume (MTV) were measured...
June 25, 2018: Japanese Journal of Radiology
Yasuhiro Shimizu, Shigeyuki Takamatsu, Kazutaka Yamamoto, Yoshikazu Maeda, Makoto Sasaki, Hiroyasu Tamamura, Sayuri Bou, Tomoyasu Kumano, Toshifumi Gabata
PURPOSE: The purpose of this study was to analyze the respiratory motion of each segment of the liver in patients with or without a history of abdominal surgery using four-dimensional computed tomography. MATERIALS AND METHODS: In total, 57 patients treated for abdominal tumors using proton beam therapy were enrolled. Eighteen patients had a history of abdominal surgery and 39 did not. The positions of clearly demarcated, high-density regions in the liver were measured as evaluation points with which to quantify the motion of each liver segment according to the Couinaud classification...
June 20, 2018: Japanese Journal of Radiology
Yeliz Akturk, Serra Ozbal Gunes
PURPOSE: This study aims to determine the normal limits of atlanto-dental interval (ADI), basion-dens interval (BDI), basion-cartilaginous dens interval (BCDI), and prevertebral soft tissue thickness (PVSTT) according to age groups for normal pediatric cases. MATERIALS AND METHODS: CT images of 256 pediatric patients aged between 1 and 15 years were retrospectively evaluated. ADI, BDI, BCDI and PVSTT measurements were performed. RESULTS: Upper normal limit (UNL) values for ADI were 2...
June 19, 2018: Japanese Journal of Radiology
M Kardos
No abstract text is available yet for this article.
June 15, 2018: Japanese Journal of Radiology
Chaehun Lim, Myeong-Im Ahn, Jung Im Jung, Kyongmin Sarah Beck
PURPOSE: To assess the usefulness of simple axial bi-dimensional diameters of pericardial fat tissues at low-dose chest CT, in correlation with metabolic parameters in predicting metabolic syndrome. MATERIALS AND METHODS: Subjects were 373 asymptomatic individuals who performed both low-dose chest CT and abdominal fat CT for medical check-up. Maximum bi-dimensional axial diameters of paracardial fats at right (RPF) and left (LPF) cardiophrenic angle portions, and epicardial fats around right (REF) and left (LEF) coronary arteries, and coronary sinus (SEF) were measured...
June 14, 2018: Japanese Journal of Radiology
Naoko Kinoshita, Shigeko Tanaka, Yuko Sugimori, Koichi Nakahira, Koji Ryoke, Toshiyuki Matsuoka, Masayuki Fujioka, Yukio Miki
PURPOSE: We performed lumbar spinal magnetic resonance imaging of three-dimensional (3D) dual echo volumetric isotropic turbo spin echo acquisition (DE-VISTA) and constructed DE-VISTA additional fusion images (DE-VISTA-AFI), which is the addition of DE-VISTA proton density-weighted images (DE-VISTA-PDWI) to DE-VISTA T2-weighted images (DE-VISTA-T2WI). The aim of this study was to clarify whether DE-VISTA-AFI was able to clearly delineate spinal nerve roots. METHODS: A total of 677 patients underwent lumbar MR imaging, and the signal ratio (SR) between cerebrospinal fluid and nerve roots inside the dural sac and the SR between fat and nerve roots outside the dural sac were estimated using DE-VISTA-AFI, DE-VISTA-PDWI, DE-VISTA-T2WI, and 2D-T2WI...
June 12, 2018: Japanese Journal of Radiology
Tatsuaki Sumiyoshi, Takehiro Okabayashi, Yuji Negoro, Yasuhiro Hata, Yoshihiro Noda, Kenta Sui, Jun Iwata, Manabu Matsumoto
PURPOSE: The value of indocyanine green (ICG) test is negatively affected in patients with intrahepatic shunt, ICG excretory defect, or jaundice. This study evaluated 99m Tc-GSA SPECT/CT fusion imaging for assessing liver function in patients with severely deteriorated ICG values. MATERIALS AND METHODS: Thirteen hepatectomy candidates with ICG retention rates over 40% were retrospectively analyzed. The ICG clearance rate (KICG) and estimated KICG obtained by 99m Tc-GSA scintigraphy (KGSA) were used to evaluate preoperative whole liver function...
June 12, 2018: Japanese Journal of Radiology
Ji Yoon Moon, Seong Hyun Kim, Seo-Youn Choi, Jeong Ah Hwang, Ji Eun Lee, Jisun Lee
PURPOSE: To evaluate value of gadoxetic acid-enhanced and diffusion-weighted (DW) MRI for distinguishing malignant from benign hyperintense nodules on unenhanced T1-weighted images (T1WIs) in patients with chronic liver disease. MATERIALS AND METHODS: Forty-two patients with 37 malignant and 41 benign hyperintense nodules on unenhanced T1WIs who underwent gadoxetic acid-enhanced and DW MRI, followed by histopathological examination, were included. Qualitative and quantitative analyses were conducted...
June 6, 2018: Japanese Journal of Radiology
Hiroki Kato, Masaya Kawaguchi, Tomohiro Ando, Keisuke Mizuta, Mitsuhiro Aoki, Masayuki Matsuo
Pleomorphic adenoma (PA) is the most common salivary gland tumor and is characterized by cytomorphological and architectural diversity. On CT and MR images, PAs are shown as well-defined lesions occasionally accompanied by characteristic lobulated contours. On T2-weighted images, typical PAs show marked hyperintensity, which reflects the abundant myxochondroid stroma, with a hypointense rim indicating the fibrous capsule. However, intratumoral signal intensity varies according to the cellular density, proportion of epithelial and stromal components, and type of stromal components...
May 29, 2018: Japanese Journal of Radiology
Wirana Angthong, Kran Jiarakoop, Kaan Tangtiang
PURPOSE: To determine useful CT parameters to differentiate ampullary carcinomas from benign ampullary obstruction. MATERIALS AND METHODS: This study included 93 patients who underwent abdominal CT, 31 patients with ampullary carcinomas, and 62 patients with benign ampullary obstruction. Two radiologists independently evaluated CT parameters then reached consensus decisions. Statistically significant CT parameters were identified through univariate and multivariate analyses...
May 21, 2018: Japanese Journal of Radiology
Ryo Ogawa, Tomoyuki Kido, Masashi Nakamura, Teruhito Kido, Teruhito Mochizuki, Takashi Sugiyama
PURPOSE: We evaluated the associations between gestational age (GA) and lung-to-liver signal intensity ratio (LLSIR) and fetal lung volume (FLV) using magnetic resonance imaging (MRI). Moreover, we evaluated the reproducibility of these measurements. MATERIALS AND METHODS: LLSIR and FLV were measured using single-shot fast spin-echo MRI in 88 consecutive fetuses. The Spearman test was used to assess the relationships between (1) LLSIR and GA, and (2) FLV and GA in 81 fetuses without lung abnormalities...
May 16, 2018: Japanese Journal of Radiology
Shuji Kariya, Miyuki Nakatani, Takuji Maruyama, Yasuyuki Ono, Yutaka Ueno, Atsushi Komemushi, Noboru Tanigawa
PURPOSE: To evaluate the clinical results of central venous access port (CV port) placement by translumbar inferior vena cava cannulation using angio-CT unit for cancer patients with superior vena cava syndrome. MATERIALS AND METHODS: A CV port was placed by translumbar inferior vena cava cannulation using an angio-CT unit, in 14 consecutive patients. All patients had occlusion or advanced stenosis of the superior vena cava due to cancer progression. RESULTS: The technical success rate of the percutaneous translumbar CV port placement was 100%...
May 9, 2018: Japanese Journal of Radiology
Kotaro Ouchi, Toru Sakuma, Hiroya Ojiri
PURPOSE: We considered cardiac computed tomography (CT) as a possible alternative modality to echocardiography in the assessment of infective endocarditis (IE). We evaluated the diagnostic capability of preoperative CT. MATERIALS AND METHODS: We retrospectively evaluated the depiction of vegetations and perivalvular complications in preoperative cardiac CT images of 14 patients diagnosed with IE who required surgical intervention, who were seen at our institution from May 30, 2008 to February 3, 2017...
April 30, 2018: Japanese Journal of Radiology
Tomoko Maekawa, Masaaki Hori, Katsutoshi Murata, Thorsten Feiweier, Issei Fukunaga, Christina Andica, Akifumi Hagiwara, Koji Kamagata, Saori Koshino, Osamu Abe, Shigeki Aoki
PURPOSE: Compared with the conventional pulsed gradient spin-echo (PGSE) sequence, diffusion-weighted imaging (DWI) with the oscillating gradient spin-echo (OGSE) sequence can shorten the diffusion time by changing the frequency. The purpose was to investigate whether n-alkanes are suitable as isotropic phantoms for estimating the diffusion coefficient with the OGSE sequence. MATERIALS AND METHODS: We investigated changes in the apparent diffusion coefficient (ADC) due to differences in the viscosities of nine n-alkane phantoms with different numbers of carbon atoms from C8 H18 to C16 H34 using OGSE and PGSE sequences at 21 °C...
April 26, 2018: Japanese Journal of Radiology
Eray Atlı, Erhan Akpınar, Emre Ünal, Berna Oğuz Sayan, Mithat Haliloğlu
PURPOSE: To investigate feasibility of high-pitch acquisition protocol for imaging of pediatric abdomen. MATERIALS AND METHODS: The study group consisted of 90 patients scanned with high-pitch acquisition protocol (pitch = 3) by 64-slice dual-source CT (DSCT) scanner. Fifty-four patients scanned with standard protocol (pitch = 1.5) by 16-slice single-source CT scanner comprised the control group. Anteroposterior and lateral diameters of abdomen, effective diameter, scan time and length, qualitative and quantitative noise levels, volumetric CT dose index (CTDIvol), dose length product (DLP), and size-specific dose estimations were compared between groups...
July 2018: Japanese Journal of Radiology
Nobuyoshi Fukumitsu, Toshiyuki Okumura, Yuichi Hiroshima, Toshiki Ishida, Haruko Numajiri, Keiko Nemoto Murofushi, Kayoko Ohnishi, Teruhito Aihara, Hitoshi Ishikawa, Koji Tsuboi, Hideyuki Sakurai
PURPOSE: The purpose of this study is to investigate the dose distribution of proton beam therapy (PBT) using a concomitant boost technique for unresectable pancreatic cancers. MATERIALS AND METHODS: This simulation study involved 36 patients with unresectable pancreatic cancer. The irradiation dose was set as 67.5 gray equivalent (GyE) with 25 fractions using concomitant boost technique. The irradiation dose was set as 50 GyE to cover the whole target and another posterior beam of 17...
July 2018: Japanese Journal of Radiology
Kiyoyuki Minamiguchi, Junko Takahama, Tomoko Uchiyama, Ryosuke Taiji, Natsuhiko Saito, Hiroshi Okada, Nagaaki Marugami, Yasuhito Tanase, Ryuji Kawaguchi, Chiho Ohbayashi, Hiroshi Kobayashi, Toshiko Hirai, Kimihiko Kichikawa
PURPOSE: The purpose of this study was to identify the magnetic resonance imaging (MRI) features of uterine endometrial carcinoma (EC) with DNA mismatch repair (MMR) deficiency. MATERIALS AND METHODS: This was a retrospective study approved by our institutional review board. The study included 118 patients pathologically diagnosed as having EC in our institution from April 2014 to December 2016. Of 118 patients, 8 were excluded because of insufficient data. Immunohistochemical analysis of MMR was performed retrospectively to observe the expressions of MLH1, MSH2, MSH6, and PMS2...
July 2018: Japanese Journal of Radiology
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