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Japanese Journal of Radiology

Ovidiu Veresezan, Idriss Troussier, Alexis Lacout, Sarah Kreps, Sophie Maillard, Aude Toulemonde, Pierre-Yves Marcy, Florence Huguet, Juliette Thariat
Modern radiation therapy techniques are characterized by high conformality to tumor volumes and steep dose gradients to spare normal organs. These techniques require accurate clinical target volume definitions and rigorous assessment of set up uncertainties using image guidance, a concept called image-guided radiation therapy. Due to alteration of patient anatomy, changes in tissue density/volumes and tumor shrinkage over the course of treatment, treatment accuracy may be challenged. This may result in excessive irradiation of organs at risk/healthy tissues and undercoverage of target volumes with a significant risk of locoregional failure...
December 1, 2016: Japanese Journal of Radiology
Alfonso J Rodriguez-Morales
No abstract text is available yet for this article.
November 28, 2016: Japanese Journal of Radiology
Hidenobu Hashimoto, Yoshimitsu Fukushima, Shin-Ichiro Kumita, Masaaki Miyamoto, Gen Takagi, Junichi Yamazaki, Takanori Ikeda
PURPOSE: The purpose of this study was to estimate the severity of the participants' lower limb ischemia by calculating the lower limb muscle-to-background ratio (LMBR) using lower limb perfusion single-photon emission computed tomography-computed tomography (SPECT/CT) and to evaluate the prognostic value of LMBR in peripheral artery disease (PAD) patients. MATERIALS AND METHODS: This retrospective study consists of 38 patients with PAD (70 ± 12 years) and observed over 1 year who were included in the analysis...
November 21, 2016: Japanese Journal of Radiology
Takuya Sato, Toshihiro Iguchi, Takao Hiraki, Hideo Gobara, Hiroyasu Fujiwara, Jun Sakurai, Yusuke Matsui, Toshiharu Mitsuhashi, Junichi Soh, Shinichi Toyooka, Susumu Kanazawa
PURPOSE: This retrospective, single-center study evaluated radiofrequency (RF) ablation for pulmonary metastases of sarcoma. MATERIALS AND METHODS: Forty-six patients with sarcoma (144 pulmonary metastases) underwent 88 RF ablation sessions. Data regarding local tumor progression, efficacy, procedural adverse events (AEs; National Cancer Institute Common Terminology Criteria for Adverse Events, version 4.0), overall survival (OS), and OS-associated prognostic factors were retrospectively evaluated using univariate analyses...
November 18, 2016: Japanese Journal of Radiology
Mohammad Zare Mehrjardi, Andrea Poretti, Elham Keshavarz
No abstract text is available yet for this article.
November 9, 2016: Japanese Journal of Radiology
Wei Zhao, Jin-Zhou Chen, Ji-Hong Hu, Jian-Qiang Huang, Yong-Neng Jiang, Gang Luo, Gen-Fa Yi, Zhao-Hong Peng, Hui Wang, Jin Shen, Bu-Lang Gao
PURPOSE: To investigate in vivo effect of radiofrequency ablation (RFA) on swine long bones and the repair process. MATERIALS AND METHODS: RFA was performed in six swine at the end and middle part of the tibia or femur. After RFA, radiological examinations were performed, and the swine were killed immediately and at different time points post-RFA for histopathological examination. RESULTS: All swine had successful RFA. The RFA-induced elliptical necrotic area ranged from 3...
November 7, 2016: Japanese Journal of Radiology
Yoichi Otomi, Takayoshi Shinya, Naoto Uyama, Yuta Arai, Kanako Miyamoto, Katsuya Takechi, Michiko Kubo, Hideki Otsuka, Masafumi Harada
PURPOSE: The purpose of the study was to evaluate the physiological accumulation of (18)F-FDG in the muscles in relation to the side of intravenous administration. MATERIALS AND METHODS: We retrospectively investigated 3,118 (18)F-FDG-PET/CT examinations. We evaluated the physiological accumulation of FDG in the muscles of the shoulder and arm relative to its dependence on the side of intravenous administration. RESULTS: Six hundred six of the 3,118 examinations (19...
November 3, 2016: Japanese Journal of Radiology
Koji Sakai, Kei Yamada, Kentaro Akazawa, Jun Tazoe, Masashi Yasuike, Hitomi Nagano, Hiroyasu Ikeno, Toshiaki Nakagawa
PURPOSE: Q-space imaging (QSI) is a novel magnetic resonance imaging (MRI) technique that enables assessment of micro-structural changes of white matter. The acquisition time, however, is comparatively long to use for routine clinical assessment. Therefore, the present study investigated the clinically feasible b value combinations to measure the water molecular displacement probability density function (PDF) in healthy subjects. METHODS: The subjects consisted of five healthy volunteers (1 female and 4 male; 40...
November 2, 2016: Japanese Journal of Radiology
Viroj Wiwanitkit
No abstract text is available yet for this article.
November 1, 2016: Japanese Journal of Radiology
Ryusuke Irie, Kohei Tsuruta, Masaaki Hori, Michimasa Suzuki, Koji Kamagata, Atsushi Nakanishi, Kouhei Kamiya, Madoka Nakajima, Masakazu Miyajima, Hajime Arai, Shigeki Aoki
PURPOSE: To evaluate diffusional changes of the corticospinal tract (CST) in patients with idiopathic normal pressure hydrocephalus (iNPH) by neurite orientation dispersion and density imaging (NODDI). MATERIALS AND METHODS: Nineteen patients with iNPH and 12 healthy controls were included. Diffusion MRI data for NODDI were acquired with a 3-T system, using 32 motion-probing gradient directions with six b-values (from 0 to 2500 s/mm(2)). The orientation dispersion index (ODI), intra-cellular volume fraction (Vic), and isotropic volume fraction (Viso) of the CST were calculated by tract-specific analysis in patients and controls...
October 27, 2016: Japanese Journal of Radiology
Ryo Takaji, Shunro Matsumoto, Maki Kiyonaga, Yasunari Yamada, Hiromu Mori, Yukio Iwashita, Masayuki Ohta, Masafumi Inomata, Naoki Hijiya, Masatsugu Moriyama, Hajime Takaki, Kengo Fukuzawa, Hirotoshi Yonemasu
OBJECTIVES: Periportal low attenuation (PPLA) associated with metastatic liver cancer is occasionally seen on multi-detector-row CT (MDCT). The purpose of this study was to investigate the MDCT patterns of the PPLA and to correlate it with pathological findings. METHODS: We retrospectively reviewed the MDCT images of 63 patients with metastatic liver cancers from colorectal adenocarcinoma. On MDCT scans, PPLA associated with liver metastasis was visualized in six patients with colorectal cancer...
October 25, 2016: Japanese Journal of Radiology
Berna A Yildirim, Cem Onal, Yemliha Dolek
PURPOSE: To compare soft-tissue cone-beam computed tomography (CBCT-P) and fiducial marker (CBCT-FM)-based image guided radiotherapy in prostate cancer patients. MATERIALS AND METHODS: Sixteen prostate cancer patients were treated with volumetric modulated arc therapy. Manual alignment using CBCT-P and CBCT-FM was performed for each patient. Couch shifts were calculated and compared between methods in the left-right (x), superior-inferior (y), and anterior-posterior (z) directions...
October 11, 2016: Japanese Journal of Radiology
Shirou Ishii, Takamitsu Hara, Takeyuki Nanbu, Hiroki Suenaga, Shigeyasu Sugawara, Daichi Kuroiwa, Hirofumi Sekino, Masayuki Miyajima, Hitoshi Kubo, Noboru Oriuchi, Hiroshi Ito
Although PET/MRI has the advantages of a simultaneous acquisition of PET and MRI, high soft-tissue contrast of the MRI images, and reduction of radiation exposure, its low profitability and long acquisition time are significant problems in clinical settings. Thus, MRI protocols that meet oncological purposes need to be used in order to reduce examination time while securing detectability. Currently, half-Fourier acquisition single-shot turbo spin echo and 3D-T1 volumetric interpolated breath-hold examination may be the most commonly used sequences for whole-body imaging due to their shorter acquisition time and higher diagnostic accuracy...
October 6, 2016: Japanese Journal of Radiology
Selcuk Demiral, Ferrat Dincoglan, Omer Sager, Hakan Gamsiz, Bora Uysal, Esin Gundem, Yelda Elcim, Bahar Dirican, Murat Beyzadeoglu
PURPOSE: While microsurgical resection plays a central role in the management of ACMs, extensive surgery may be associated with substantial morbidity particularly for tumors in intimate association with critical structures. In this study, we evaluated the use of HFSRT in the management of ACM. MATERIALS AND METHODS: A total of 22 patients with ACM were treated using HFSRT. Frameless image guided volumetric modulated arc therapy (VMAT) was performed with a 6 MV linear accelerator (LINAC)...
September 22, 2016: Japanese Journal of Radiology
Bin Xu, Guoping Jiang, Jingjing Ye, Jin He, Wangfang Xie
PURPOSE: To evaluate the renal cortex stiffness in children with glomerular disease by shear wave based elastography point quantification (ElastPQ), and to investigate the association between shear wave velocity (SWV) in the renal cortex and age in normal children, and the inter-gender differences. MATERIALS AND METHODS: One hundred and five children who were pathologically confirmed with glomerular diseases were selected as the disease group. Meanwhile, 120 healthy children were selected as the control group...
September 22, 2016: Japanese Journal of Radiology
Mitsuhiro Kinoshita, Katsuya Takechi, Seiji Iwamoto, Shoichiro Takao, Ryozo Shirono, Masafumi Harada
PURPOSE: To evaluate the usefulness of cone-beam computed tomography (CBCT) for monitoring the transcatheter arterial chemoembolization (TACE) of hepatocellular carcinomas supplied by the cystic artery. MATERIALS AND METHODS: In seven tumors (mean diameter: 19 mm), the iodized oil distributions in the tumor and gallbladder wall were evaluated by CBCT after injecting iodized oil emulsion (LipCBCT) through the cystic artery. Gelatin sponge particles were injected to completely obstruct the tumor-feeding vessel when iodized oil deposition was seen in less than one third of the wall circumference...
September 21, 2016: Japanese Journal of Radiology
Takuji Araki, Hiroki Okada, Hiroshi Onishi
PURPOSE: To evaluate the importance of selecting an appropriate catheter shape for the right adrenal vein (RAV) anatomy on CT to the success of right adrenal venous sampling (RAVS) by elucidating the interactions of anatomical factors with catheter shape. MATERIALS AND METHODS: 130 patients with enhanced CT underwent RAVS using two catheters: catheter 1 was planar and catheter 2 was a three-dimensional shape. The following anatomical factors on CT were evaluated in each patient: presence of a right adrenal tumor, presence of a common trunk with an accessory right hepatic vein, diameter of the RAV, short and long diameters of the IVC, ratio of the long to the short diameter of IVC, and the transverse, modified transverse, and vertical angles of the RAV...
September 20, 2016: Japanese Journal of Radiology
Nagara Tamaki
No abstract text is available yet for this article.
December 2016: Japanese Journal of Radiology
Aimin Ding, Guoqing Qiu, Wensheng Lin, Ling Hu, Guangliang Lu, Xiang Long, Xin Hong, Yaohua Chen, Xiaoping Luo, Qinqin Tang, Dongqin Deng
PURPOSE: Fractional flow reserve based on coronary computed tomographic angiography (CCTA; FFRCT) can evaluate functional severity in coronary artery disease (CAD). This study investigated the diagnostic value of FFRCT for determining CAD severity. MATERIALS AND METHODS: Medline, Cochrane, EMBASE, and Google Scholar databases were searched until June 16, 2016 using the following search terms: fractional flow reserve, coronary computed tomography angiography, myocardial ischemia...
December 2016: Japanese Journal of Radiology
Akitoshi Inoue, Shinichi Ohta, Norihisa Nitta, Masahiro Yoshimura, Tomoharu Shimizu, Masaji Tani, Ryoji Kushima, Kiyoshi Murata
PURPOSE: To evaluate the feasibility of assessing advanced T-stage (T3-T4) colorectal carcinomas by correlating MRI with histopathological findings. MATERIALS AND METHODS: The study population comprised 31 patients with 32 lesions (22 colon and 10 rectal carcinomas). The relationship between the tumor and bowel layers on T2- and contrast-enhanced T1-weighted images (T2WI, CE-T1WI), bowel wall deformity, and the linear architecture of subserosal fat on T2WI scans was independently assessed by two radiologists...
December 2016: Japanese Journal of Radiology
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