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Japanese Journal of Radiology

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https://www.readbyqxmd.com/read/29785537/differentiation-of-benign-and-malignant-ampullary-obstruction-by-multi-row-detector-ct
#1
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
https://www.readbyqxmd.com/read/29767297/magnetic-resonance-assessment-of-fetal-lung-maturity-comparison-between-signal-intensity-and-volume-measurement
#2
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
https://www.readbyqxmd.com/read/29748836/simulation-study-of-dosimetric-effect-in-proton-beam-therapy-using-concomitant-boost-technique-for-unresectable-pancreatic-cancers
#3
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...
May 10, 2018: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/29744732/central-venous-access-port-placement-by-translumbar-approach-using-angio-ct-unit-in-patients-with-superior-vena-cava-syndrome
#4
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
https://www.readbyqxmd.com/read/29728922/uterine-endometrial-carcinoma-with-dna-mismatch-repair-deficiency-magnetic-resonance-imaging-findings-and-clinical-features
#5
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...
May 4, 2018: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/29713878/cardiac-computed-tomography-as-a-viable-alternative-to-echocardiography-to-detect-vegetations-and-perivalvular-complications-in-patients-with-infective-endocarditis
#6
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
https://www.readbyqxmd.com/read/29700795/changes-in-the-adc-of-diffusion-weighted-mri-with-the-oscillating-gradient-spin-echo-ogse-sequence-due-to-differences-in-substrate-viscosities
#7
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
https://www.readbyqxmd.com/read/29696477/imaging-features-of-benign-mass-lesions-in-the-nasal-cavity-and-paranasal-sinuses-according-to-the-2017-who-classification
#8
REVIEW
Hiroyuki Tatekawa, Taro Shimono, Masahiko Ohsawa, Satoshi Doishita, Shinichi Sakamoto, Yukio Miki
The World Health Organization (WHO) 2017 classification of head and neck tumors has been just published and has reorganized tumors of the nasal cavity and paranasal sinuses. In this classification, three new entities (seromucinous hamartoma, NUT carcinoma, and biphenotypic sinonasal sarcoma) were included, while the total number of tumors has been reduced by excluding tumors if they did not occur exclusively or predominantly in this region. Among these entities, benign tumors were classified as sinonasal papillomas, respiratory epithelial lesions, salivary gland tumors, benign soft tissue tumors, or other tumors...
April 25, 2018: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/29671193/diagnostic-performance-of-18-f-fdg-pet-ct-and-whole-body-mri-before-and-early-after-treatment-of-multiple-myeloma-a-prospective-comparative-study
#9
Mohammad Abd Alkhalik Basha, Maged Abdel Gelil Hamed, Rania Refaat, Mohamad Zakarya AlAzzazy, Manar A Bessar, Elshaimaa Mohamed Mohamed, Ayman F Ahmed, Heba Fathy Tantawy, Khaled Mohamed Altaher, Ahmed Ali Obaya, Amira Hamed Mohamed Afifi
OBJECTIVE: To determine the diagnostic accuracy of WB-MRI and 18 F-FDG PET/CT in detecting infiltration pattern, disease activity, and response to treatment in patients with multiple myeloma (MM). MATERIALS AND METHODS: Fifty-six patients with confirmed MM were included in the present study for pre-treatment evaluation. Among these individuals, 22 patients were available for the post-treatment evaluation of response to therapy. All patients were imaged with both WB-MRI and 18 F-FDG PET/CT...
April 18, 2018: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/29623551/classification-of-uterine-artery-angiographic-images-a-predictive-factor-of-failure-in-uterine-artery-embolization-for-postpartum-hemorrhage
#10
Eisuke Ueshima, Koji Sugimoto, Takuya Okada, Naoto Katayama, Yutaka Koide, Keitaro Sofue, Mayumi Morizane, Kenji Tanimura, Masashi Deguchi, Masato Yamaguchi
PURPOSE: To justify a classification system for angiographic images of uterine artery embolization (UAE) for postpartum hemorrhage (PPH) and identify new risk factors associated with failed embolization. MATERIALS AND METHODS: A retrospective analysis of 63 consecutive patients who underwent UAE for severe PPH was performed. Uterine artery angiography (UA) before embolization was classified into two types: type 1 was defined as complete staining and type 2 was defined as partial staining of the uterine arteries...
April 5, 2018: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/29623550/evaluation-of-adaptive-radiotherapy-art-by-use-of-replanning-the-tumor-bed-boost-with-repeated-computed-tomography-ct-simulation-after-whole-breast-irradiation-wbi-for-breast-cancer-patients-having-clinically-evident-seroma
#11
Omer Sager, Ferrat Dincoglan, Bora Uysal, Selcuk Demiral, Hakan Gamsiz, Yelda Elcim, Esin Gundem, Bahar Dirican, Murat Beyzadeoglu
PURPOSE: The aim of this study is to evaluate adaptive radiotherapy (ART) by use of replanning the tumor bed boost with repeated computed tomography (CT) simulation after whole breast irradiation (WBI) for breast cancer patients having clinically evident seroma. MATERIALS AND METHODS: Forty-eight patients with clinically evident seroma at the time of planning CT simulation for WBI were included. Two RT treatment plannings were generated for each patient based on the initial CT simulation and tumor bed boost CT simulation to assess seroma and boost target volume (BTV) changes during WBI...
April 5, 2018: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/29616399/techniques-of-adrenal-venous-sampling-in-patients-with-inferior-vena-cava-or-renal-vein-anomalies
#12
Kenji Endo, Satoru Morita, Shingo Suzaki, Hiroshi Yamazaki, Yu Nishina, Shuji Sakai
PURPOSE: To review the techniques and technical success rate of adrenal venous sampling (AVS) in patients with inferior vena cava (IVC) or renal vein anomalies. MATERIALS AND METHODS: The techniques and success rate of AVS in 15 patients with anomalies [8 with double IVC (dIVC), 3 with left IVC (ltIVC), 2 with retroaortic left renal vein (LRV), and 2 with circumaortic LRV] underwent AVS was retrospectively reviewed. RESULTS: Among 11 patients with IVC anomalies, the success rates for sampling the right and left adrenal veins (RAV and LAV) were 81...
April 3, 2018: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/29616398/automatic-spectral-imaging-protocol-selection-combined-with-iterative-reconstruction-can-enhance-image-quality-and-decrease-radiation-and-contrast-dosage-in-abdominal-ct-angiography
#13
Xiao-Ping Yin, Bu-Lang Gao, Cai-Ying Li, Zi-Wei Zuo, Ying-Jin Xu, Jia-Ning Wang, Huai-Jun Liu, Guang-Lu Liang
PURPOSE: To investigate the effect of automatic spectral imaging protocol selection (ASIS) and adaptive statistical iterative reconstruction (ASIR) technology in reducing radiation and contrast dosage. METHODS: Sixty-four patients were randomly divided into two groups for abdominal computed tomography (CT): the experiment group with ASIS plus 50% ASIR and the control with 120 kVp voltage. RESULTS: The CT dose-index volume decreased by 23...
April 3, 2018: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/29611039/analysis-of-computed-tomography-density-of-liver-before-and-after-amiodarone-administration
#14
Masazumi Matsuda, Aoi Otaka, Tomoki Tozawa, Tomoyuki Asano, Koichi Ishiyama, Manabu Hashimoto
PURPOSE: To evaluate CT density of liver changes between before and after amiodarone administration. MATERIALS AND METHODS: Twenty-five patients underwent non-enhanced CT including the liver before and after amiodarone administration. We set regions of interest (ROIs) at liver S8, spleen, paraspinal muscle, and calculated average CT density in these ROIs, then compared CT density between liver and other organs. Statistical differences between CT density of liver and various ratios before and after administration were determined, along with correlations between cumulative dose of amiodarone and liver density after administration, density change of liver, and various ratios after administration...
April 2, 2018: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/29603060/correction-to-global-and-japanese-regional-variations-in-radiologist-potential-workload-for-computed-tomography-and-magnetic-resonance-imaging-examinations
#15
Kanako K Kumamaru, Akihiro Machitori, Ritsuko Koba, Shinpei Ijichi, Yasuo Nakajima, Shigeki Aoki
In Results of Abstract, the first sentence should read as: The radiologist potential workload in Japan was 2.78-4.17 times higher than those in other countries.
March 30, 2018: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/29582348/comparison-of-detectability-of-breast-cancer-by-abbreviated-breast-mri-based-on-diffusion-weighted-images-and-postcontrast-mri
#16
Takayuki Yamada, Yoshihide Kanemaki, Satoko Okamoto, Yasuo Nakajima
PURPOSE: To compare the detectability of unenhanced abbreviated magnetic resonance imaging (MRI) based on diffusion-weighted imaging (DWI) and abbreviated postcontrast MRI for breast cancer. METHODS: The study population consisted of 87 patients undergoing breast MRI between December 2016 and March 2017 in a clinical setting. All breast MRIs were performed using a 1.5-T MRI scanner with a 16-channel breast radiofrequency coil. The abbreviated protocols based on DWI (AP1) and postcontrast MRI (AP2) were assessed independently by two radiologists...
March 26, 2018: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/29556899/brain-core-temperature-of-patients-before-and-after-orthotopic-liver-transplantation-assessed-by-dwi-thermometry
#17
Gianvincenzo Sparacia, Roberto Cannella, Vincenzina Lo Re, Giuseppe Mamone, Koji Sakai, Kei Yamada, Roberto Miraglia
PURPOSE: To assess brain-core temperature of end-stage liver disease patients undergoing orthotopic liver transplantation (OLT) using a temperature measurement technique based on the apparent diffusion coefficient of the cerebrospinal fluid in the lateral ventricles. MATERIALS AND METHODS: The study group was composed of 19 patients with a model for end-stage liver disease (MELD) score of 23.7 who underwent MR imaging before and after OLT. MR imaging studies were performed with a 1...
March 19, 2018: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/29524169/clinical-use-of-cardiac-pet-mri-current-state-of-the-art-and-potential-future-applications
#18
REVIEW
Patrick Krumm, Stefanie Mangold, Sergios Gatidis, Konstantin Nikolaou, Felix Nensa, Fabian Bamberg, Christian la Fougère
Combined PET/MRI is a novel imaging method integrating the advances of functional and morphological MR imaging with PET applications that include assessment of myocardial viability, perfusion, metabolism of inflammatory tissue and tumors, as well as amyloid deposition imaging. As such, PET/MRI is a promising tool to detect and characterize ischemic and non-ischemic cardiomyopathies. To date, the greatest benefit may be expected for diagnostic evaluation of systemic diseases and cardiac masses that remain unclear in cardiac MRI, as well as for clinical and scientific studies in the setting of ischemic cardiomyopathies...
May 2018: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/29516348/three-dimensional-visualization-of-internal-vertebral-venous-plexuses-relative-to-dural-sac-and-spinal-nerve-root-of-spinal-canal-stenosis-using-mri
#19
Junji Kamogawa, Osamu Kato, Tatsunori Morizane
PURPOSE: The aim of this study was to introduce a new method of producing three-dimensional (3D) images of vertebral venous plexuses (VVPs) by 3D-MRI with and without contrast media, to identify pathoanatomical features that might accelerate or modify spinal canal stenosis. METHODS: We used a 1.5-T MRI unit with two different 3D sequences with and without contrast media. Multi planar reconstruction (MPR) images of VVPs could be obtained by volume image subtraction methods with a workstation for dural sac from whole 3D volume MPR without contrast media, using images before and after gadoteridol injection...
May 2018: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/29508261/pathology-and-images-of-radiation-induced-hepatitis-a-review-article
#20
REVIEW
Shigeyuki Takamatsu, Kazuto Kozaka, Satoshi Kobayashi, Norihide Yoneda, Kotaro Yoshida, Dai Inoue, Azusa Kitao, Takahiro Ogi, Tetsuya Minami, Wataru Kouda, Tomoyasu Kumano, Nobukazu Fuwa, Osamu Matsui, Toshifumi Gabata
Recent advances in highly conformal radiotherapies greatly extend the indications for radiotherapy of liver tumors. However, because of poor tolerance to hepatic radiation, estimation of the intensity of irradiation of the liver is important, particularly for a cirrhotic liver. Knowledge of radiation-induced hepatitis is important for understanding how to optimize hepatic radiation therapy. Pathological changes of the irradiated liver, which include perivenular fibrosis, sinusoidal obstruction, and damage to Kupffer cells and hepatocytes, can be visualized using clinical imaging techniques...
April 2018: Japanese Journal of Radiology
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