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Japanese Journal of Radiology

Tomoyuki Noguchi, Daichi Higa, Takashi Asada, Yusuke Kawata, Akihiro Machitori, Yoshitaka Shida, Takashi Okafuji, Kota Yokoyama, Fumiya Uchiyama, Tsuyoshi Tajima
PURPOSE: The confusion of MRI sequence names could be solved if MR images were automatically identified after image data acquisition. We revealed the ability of deep learning to classify head MRI sequences. MATERIALS AND METHODS: Seventy-eight patients with mild cognitive impairment (MCI) having apparently normal head MR images and 78 intracranial hemorrhage (ICH) patients with morphologically deformed head MR images were enrolled. Six imaging protocols were selected to be performed: T2-weighted imaging, fluid attenuated inversion recovery imaging, T2-star-weighted imaging, diffusion-weighted imaging, apparent diffusion coefficient mapping, and source images of time-of-flight magnetic resonance angiography...
September 19, 2018: Japanese Journal of Radiology
Yoshito Tsushima, Kazuo Awai, Gen Shinoda, Hiroyuki Miyoshi, Masayuki Chosa, Toshiyuki Sunaya, Jan Endrikat
PURPOSE: To evaluate the safety of gadobutrol for magnetic resonance imaging in a prospective, non-interventional, post-marketing surveillance in Japan. MATERIALS AND METHODS: Gadobutrol was administered in accordance with Japanese prescribing information over a 2-year enrollment period, using a standardized questionnaire to collect information. The primary outcome was the incidence of adverse reactions (ARs) following gadobutrol injection. RESULTS: Questionnaire data were analyzed for 3337 patients (age, 58...
September 19, 2018: Japanese Journal of Radiology
Yoshihiko Manabe, Yuta Shibamoto, Fumiya Baba, Takeshi Yanagi, Hiromitsu Iwata, Akifumi Miyakawa, Taro Murai, Katsuhiro Okuda
PURPOSE: The optimal treatment for hilar or mediastinal lymph node (LN) recurrence developing after stereotactic body radiotherapy (SBRT) for stage I non-small cell lung cancer remains unclear. This study evaluated 5-year results of radiotherapy in such patients in comparison with those for postoperative LN metastases. MATERIALS AND METHODS: Between 2004 and 2013, 27 patients with hilar and/or mediastinal LN metastases without local recurrence and distant metastasis after SBRT (n = 14) or surgery (n = 13) were treated with definitive conventional radiotherapy...
September 14, 2018: Japanese Journal of Radiology
Atsushi Hiroishi, Takayuki Yamada, Tsuyoshi Morimoto, Kuniyasu Horikoshi, Yasuo Nakajima
PURPOSE: To prospectively correlate the preoperative vessel anatomy in three-dimensional computed tomographic angiography with computed tomographic colonography (3D-CTA with CTC) with that in laparoscopic surgery for colorectal cancer. METHODS: The study protocol was approved by our institutional review board. The study population consisted of 101 patients with colon cancer who underwent 3D-CTA with CTC between June 2016 and January 2018. Two radiologists assessed the branching patterns of sigmoid arteries (SAs) and right colonic artery (RCA), the position between the ileocolic artery (ICA) and superior mesenteric vein (SMV), and the existence of an accessory middle colonic artery (aMCA)...
September 14, 2018: Japanese Journal of Radiology
Tetsuya Komatsu, Kenta Konishi, Masahiro Aoshima, Yoshiki Tokura, Katsumasa Nakamura
PURPOSE: We retrospectively evaluated the tumor regression after radiotherapy in combination with the immune checkpoint inhibitor nivolumab for metastatic melanoma. MATERIALS AND METHODS: We evaluated the extracranial metastatic melanoma lesions to which concomitant radiotherapy with nivolumab was administered from June 2015 to February 2017. Tumor volume and maximum diameter were measured at the time of pre-radiotherapy and best response, and the tumor reduction rate was assessed in two ways that our hospital adopts: tumor volume and diameter...
September 11, 2018: Japanese Journal of Radiology
Misugi Urano, Fatmaelzahraa Abdelfattah Denewar, Taro Murai, Masaru Mizutani, Masanori Kitase, Kazuya Ohashi, Norio Shiraki, Yuta Shibamoto
The internal mammary lymph node (IMLN) chain is a pathway through which breast lymphatic drainage flows. The internal mammary lymphatic vessel runs around the internal mammary artery and veins with IMLN in the parasternal intercostal spaces. IMLN metastasis, which forms a part of clinical TNM staging, may negatively affect the prognosis of primary breast cancer patients. IMLN metastasis is clinically detected using ultrasound, computed tomography, magnetic resonance imaging, and 18 F-deoxyglucose positron emission tomography computed tomography...
September 7, 2018: Japanese Journal of Radiology
Akira Yamada, Yukinori Okajima, Eriko Yoshizawa, Fumiaki Fukamatsu, Takayuki Mitsui, Takeshi Suzuki, Fumihito Ichinohe, Kazuki Oyama, Keisuke Todoroki, Mana Maehara, Takanori Aonuma, Tomofumi Nonaka, Yasunari Fujinaga, Masumi Kadoya
PURPOSE: To assess whether the modified reading system "Triage Reader" (TR) can improve the radiological reading work environment. MATERIALS AND METHODS: This retrospective, single-center study analyzed two reading systems for 26,786 computed tomography and magnetic resonance imaging examinations. In the conventional system (January 1-May 31, 2016), all reading work was mostly completed within the day. In the TR system (January 1-May 31, 2017), a radiology resident (TR) first read every image immediately after the examination and tagged each examination according to actual image findings and clinical demands...
September 1, 2018: Japanese Journal of Radiology
Shinji Naganawa, Yukunori Korogi
No abstract text is available yet for this article.
August 27, 2018: Japanese Journal of Radiology
Ayumi Iyama, Daisuke Utsunomiya, Hiroyuki Uetani, Masafumi Kidoh, Takeshi Sugahara, Shunji Yoshimatsu, Yasuyuki Yamashita
Earthquakes are unpredictable and inevitable disasters, causing various earthquake-related disorders. Medical imaging, including digital radiography, computed tomography, and magnetic resonance imaging, plays a key role in the evaluation of earthquake-related disorders. We here demonstrate the concept of diagnostic imaging after a massive earthquake and review the common imaging features of various disorders in casualties and evacuees. This summary of imaging features can facilitate the diagnosis of various earthquake-related disorders and promote judicious therapy planning...
August 25, 2018: Japanese Journal of Radiology
Miwako Nomura, Nobukazu Fuwa, Yutaka Toyomasu, Akinori Takada, Noriko Ii, Jouji Nomura, Hiroyuki Yamada
PURPOSE: We developed an external carotid arterial sheath (ECAS) for performing intra-arterial chemotherapy (IACT) via the superficial temporal artery for head and neck cancer. This study aimed to assess the potential of a novel microcatheter with a steerable tip inserted through the ECAS in comparison to an existing hook-type microcatheter. MATERIALS AND METHODS: The same operator used two types of microcatheters alternately for each weekly IACT session with the same patient, and the fluoroscopy time required for catheterization and the arterial selectivity of each microcatheter were compared...
August 18, 2018: Japanese Journal of Radiology
Takahiro Hosokawa, Yoshitake Yamada, Mayumi Hsokawa, Shunsuke Kikuchi, Kenji Ohira, Yutaka Tanami, Yumiko Sato, Eiji Oguma
Anorectal malformation (ARM) is classified as low, intermediate, or high; accurate diagnosis of the type during the early neonatal period is important to determine the appropriate initial surgical approach. This review assesses the role of ultrasound examination in the classification of ARM during the neonatal period, with a focus on landmarks on the sonogram, the approach used for sonography, and the optimal examination timing. The following three factors on the sonogram are used for the classification: location of the fistula, the distance between the distal rectal pouch and the anal dimple (perineum) (P-P distance), and the relationship between the puborectalis muscle and the distal rectal pouch...
August 17, 2018: Japanese Journal of Radiology
Daichi Hayashi, Ali Guermazi
No abstract text is available yet for this article.
August 16, 2018: Japanese Journal of Radiology
Masaya Miyazaki, Kenichi Saito, Takashi Yanagawa, Hirotaka Chikuda, Yoshito Tsushima
PURPOSE: This prospective phase I trial was conducted to evaluate the safety of percutaneous cryoablation for osteoid osteoma (OO). MATERIALS AND METHODS: Nine patients with OO (mean tumor size: 5.9 mm; tibia, n = 5; femur, n = 2; lumbar spine, n = 2) were enrolled and treated with percutaneous cryoablation. The primary endpoint was the evaluation of the treatment safety as determined using step-by-step registration. The secondary endpoints were the incidence and grade of adverse events by CTCAE version 4...
August 14, 2018: Japanese Journal of Radiology
Jun Koizumi, Takuya Hara, Tatsuya Sekiguchi, Tamaki Ichikawa, Hiroyuki Tajima, Naoko Takenoshita, Masato Tanikake, Yohsuke Suyama, Tatsumi Kaji, Kenichi Kato, Miyuki Sone, Yasuaki Arai, Hiroshi Anai, Kimihiko Kichikawa, Hiroyuki Fujieda, Toshiya Nishibe, Norikazu Yamada, Mashio Nakamura, Takeshi Nakano, Takeyoshi Kunieda, Takayuki Kuriyama, Tsuneaki Sugimoto, Morimasa Takayama, Takao Kobayashi, Shinya Goto, Minoru Kanazawa, Masaaki Itou, Kunio Shirato
PURPOSE: Inferior vena cava filter fracture (FF) may cause life-threatening complications, including cardiac tamponade, although the actual prevalence remains unclear. Therefore, we investigated the incidence of FF. MATERIALS AND METHODS: Data on fracture incidence with filter brands, filter positions [suprarenal (SR) vs. infrarenal (IR)], and follow-up durations were collected from the databases of eight hospitals. RESULTS: Of 532 patients, Günther Tulip (GT), Trap/OptEase (TE/OE), ALN and VenaTech (VT) were implanted in 345, 147, 38 and 2 patients, respectively...
August 14, 2018: Japanese Journal of Radiology
Carmela Visalli, Marco Cavallaro, Antonella Concerto, Domenico La Torre, Rosanna Di Salvo, Silvio Mazziotti, Ignazio Salamone
Traumatic injury to limb peripheral nerves represents an important cause of morbidity and disability. Timely diagnosis and treatment are crucial to optimizing outcomes. The initial evaluation requires a careful history, a thorough physical examination, and electrodiagnostic tests, which lead in most cases to a diagnostic suspicion, but fail to provide an extensive qualitative and quantitative assessment of the nerve damage. Ultrasonography (US) is a low-cost, non-invasive technique which allows for direct visualization of nerve internal structure...
August 13, 2018: Japanese Journal of Radiology
Chun-Shuang Guan, Zhi-Bin Lv, Ru-Ming Xie, Chun-Jie Liang, Da-Qing Ma
OBJECTIVE: To retrospectively analyse the imaging findings of the linear shadows that connect the oblique fissures and the costal pleurae on the superior segments of the lower lobes on thin-slice lung CT. MATERIALS AND METHODS: Thin-slice CT scans of 221 cases of normal lungs and 86 abnormal lungs were collected. The parameters of the imaging observations included the existence of the superior segmental linear shadow, its morphology, length, and starting position, bird-beak sign, and adjacent structures on the pleural end...
July 25, 2018: Japanese Journal of Radiology
Antonella Petrillo, Roberta Fusco, Mario Petrillo, Vincenza Granata, Francesco Bianco, Massimiliano Di Marzo, Paolo Delrio, Fabiana Tatangelo, Gerardo Botti, Biagio Pecori, Antonio Avallone
PURPOSE: To investigate the potential of dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) to discriminate responder from non-responder patients after preoperative chemoradiotherapy (pCRT) in locally advanced rectal cancer (LARC). MATERIALS AND METHODS: One hundred and fifty-eight consecutive patients were enrolled in this prospective study. We compared morphological MRI (mMRI) using T2-weighted images about tumor presence and invasiveness, and functional DCE-MRI using time-intensity curve (TIC) visual inspection (qMRI), classifying TIC shape into three types: type 1, persistent enhancement; type 2, high enhancement with plateau; type 3, high enhancement with wash-out...
July 23, 2018: Japanese Journal of Radiology
Tomonori Kanda, Yuichi Wakabayashi, Feibi Zeng, Yoshiko Ueno, Keitaro Sofue, Takaki Maeda, Munenobu Nogami, Takamichi Murakami
Radiation therapy is a useful treatment for tumors and vascular malformations of the central nervous system. Radiation therapy is associated with complications, including leukoencephalopathy, radiation necrosis, vasculopathy, and optic neuropathy. Secondary tumors are also often seen long after radiation therapy. Secondary tumors are often benign tumors, such as hemangiomas and meningiomas, but sometimes malignant gliomas and soft tissue sarcomas emerge. We review the imaging findings of complications that may occur after brain radiation therapy...
September 2018: 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...
September 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...
September 2018: Japanese Journal of Radiology
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