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Japanese Journal of Radiology

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https://www.readbyqxmd.com/read/30406868/can-low-b-value-diffusion-weighted-imaging-evaluate-the-character-of-cerebrospinal-fluid-dynamics
#1
Toshiaki Taoka, Shinji Naganawa, Hisashi Kawai, Toshiki Nakane, Katsutoshi Murata
PURPOSE: We aimed to investigate whether low b value diffusion-weighted imaging (DWI) can show the change of cerebrospinal fluid (CSF) dynamics. MATERIALS AND METHODS: The subjects of this retrospective study consisted of patients with ventricular dilatation (n = 50) and controls (n = 50). The CSF signal intensity on the b = 500 s/mm2 DWI was evaluated by a scoring method in the lateral, 3rd and 4th ventricles, the cerebral sulci and the Sylvian fissure...
November 8, 2018: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/30392134/the-feasibility-of-dedicated-breast-pet-for-the-assessment-of-residual-tumor-after-neoadjuvant-chemotherapy
#2
Hiromi Koyasu, Satoshi Goshima, Yoshifumi Noda, Hironori Nishibori, Makoto Takeuchi, Kengo Matsunaga, Tetsuya Yamada, Masayuki Matsuo
PURPOSE: To evaluate the utility of ring-type dedicated breast positron emission tomography (dbPET) for the detection of the residual tumor after neoadjuvant chemotherapy (NAC). MATERIALS AND METHODS: This prospective study included 27 women with histologically proven breast cancer over a 37-month period. All patients underwent ring-type dbPET followed by whole-body PET-CT (WBPET) for preoperative tumor evaluation and re-staging after NAC. The maximum standardized uptake value (SUVmax ) of the tumor lesion and the degree of confidence for the presence of the residual tumor were compared between pathological complete response (pCR) and non-pCR tumors...
November 3, 2018: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/30377936/imaging-of-renal-cell-carcinoma-in-patients-with-acquired-cystic-disease-of-the-kidney-comparison-11-c-choline-and-fdg-pet-ct-with-dynamic-contrast-enhanced-ct
#3
Kazuhiro Kitajima, Shingo Yamamoto, Yusuke Kawanaka, Takayuki Katsuura, Masahiro Fujita, Yukako Nakanishi, Yusuke Yamada, Takahiko Hashimoto, Toru Suzuki, Shuken Go, Akihiro Kanematsu, Michio Nojima, Koichiro Yamakado
PURPOSE: To evaluate renal cell carcinoma (RCC) findings in acquired cystic disease of the kidney (ACDK) shown by 11 C-choline and FDG PET/CT, and contrast-enhanced CT. MATERIALS AND METHODS: Six ACDK patients with 7 RCCs underwent 11 C-choline and FDG PET/CT, and contrast-enhanced CT before nephrectomy. Findings obtained with 3 imagings were evaluated and sensitivity detecting RCC was compared using 3-point grading scale (negative, equivocal, positive). The equivocal scale used for SUVmax ranged from 2...
October 30, 2018: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/30357608/in-reply
#4
LETTER
Motoo Nakagawa, Yoshiyuki Ozawa, Masashi Shimohira, Yuta Shibamoto
No abstract text is available yet for this article.
October 24, 2018: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/30343401/can-the-spherical-gold-standards-be-used-as-an-alternative-to-painted-gold-standards-for-the-computerized-detection-of-lesions-using-voxel-based-classification
#5
Yukihiro Nomura, Naoto Hayashi, Shouhei Hanaoka, Tomomi Takenaga, Mitsutaka Nemoto, Soichiro Miki, Takeharu Yoshikawa, Osamu Abe
PURPOSE: For the development of computer-assisted detection (CAD) software using voxel-based classification, gold standards defined by pixel-by-pixel painting, called painted gold standards, are desirable. However, for radiologists who define gold standards, a simplified method of definition is desirable. One of the simplest methods of defining gold standards is a spherical region, called a spherical gold standard. In this study, we investigated whether spherical gold standards can be used as an alternative to painted gold standards for computerized detection using voxel-based classification...
October 20, 2018: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/30341472/amide-proton-transfer-imaging-of-tumors-theory-clinical-applications-pitfalls-and-future-directions
#6
REVIEW
Kiyohisa Kamimura, Masanori Nakajo, Tomohide Yoneyama, Koji Takumi, Yuichi Kumagae, Yoshihiko Fukukura, Takashi Yoshiura
Amide proton transfer (APT) imaging is an emerging molecular magnetic resonance imaging technique based on chemical exchange saturation transfer (CEST). APT imaging has shown promise in oncologic imaging, especially in the imaging of brain tumors. This review article illustrates the theory of CEST/APT imaging and describes the clinical utility, pitfalls, and potential for future development of APT imaging.
October 19, 2018: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/30324249/the-effectiveness-of-additional-lead-shielding-drape-and-low-pulse-rate-fluoroscopy-in-protecting-staff-from-scatter-radiation-during-cardiac-resynchronization-therapy-crt
#7
Yoshiaki Morishima, Koichi Chida, Yoshiaki Katahira
PURPOSE: Cardiac resynchronization therapy (CRT) often requires a long fluoroscopic time and protection from scatter radiation. This study reports on scatter radiation levels during CRT, with and without additional shielding, and using standard or low pulse rate fluoroscopy. MATERIALS AND METHODS: Additional lead-shielding drape (0.35-mm lead equivalent) was used on the left side of the table and pulsed fluoroscopy was performed at rates of 10 pulses/s (usual rate) and 7...
October 15, 2018: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/30324248/hilar-and-mediastinal-sarcoid-like-reaction-after-the-treatment-of-malignant-tumors-imaging-features-and-natural-course-on-18-f-fdg-pet-ct
#8
Yo Kaneko, Hiroki Kato, Masayuki Matsuo
PURPOSE: This study aimed to assess the imaging features and natural course of hilar and mediastinal sarcoid-like reaction on 18 F-fluorodeoxyglucose (FDG) PET/CT after the treatment of malignancies. METHODS: Sixteen patients with the appearance of sarcoid-like reaction seen on 18 F-FDG-PET/CT after treatment were included. Hilar and mediastinal lymph node metastases were pathologically or clinically ruled out. Posttreatment 18 F-FDG-PET/CT imaging features were assessed...
October 15, 2018: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/30317411/reliability-of-diagnosing-acute-ischemic-cerebrovascular-on-magnetic-resonance-imaging-disorders-using-ipads
#9
Hidekazu Hattori, Yoshifumi Kuwayama, Yoshitaka Inui, Kazuhiro Murayama, Motoharu Hayakawa, Shinji Ito, Hiroshi Toyama
PURPOSE: The use of tablet terminals has been explored in various medical settings; however, caution should be exercised when performing image diagnosis using this technology. The present study examined the characteristics of an iPad Air™ monitor and assessed radiographic image interpretations to verify the reliability of the telediagnosis of acute cerebral infarction based on magnetic resonance imaging (MRI) using a tablet terminal. MATERIALS AND METHODS: The luminance of the iPad Air™ was measured using a UA-10 analyzer, and radiographic image interpretation experiments were performed in 100 patients who underwent MRI within 6 h of symptom onset...
October 13, 2018: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/30264217/does-integrated-shimming-improve-lesion-detection-in-whole-body-diffusion-weighted-examinations-of-patients-with-breast-cancer
#10
Michiro Sasaki, Mitsuhiro Tozaki, Katsuya Maruyama, Thomas Benkert, Wakana Murakami, Daisuke Yotsumoto, Shunichi Oosako, Yoshiaki Sagara
PURPOSE: To evaluate the feasibility of proposed integrated slice-by-slice shimming (iShim) for whole-body diffusion weighted imaging (WB-DWI) in comparison to conventional 3D shim in patients with breast cancer. MATERIALS AND METHODS: Retrospective analysis of 116 consecutive patients (116 lesions) who underwent whole-body PET/MR using iShim (iShim group) were performed and compared with historical control of 103 patients (105 lesions) using 3D Shim (3D Shim group)...
September 27, 2018: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/30259311/risk-factors-for-atrophic-gastritis-in-the-japanese-young-and-middle-aged-a-study-using-double-contrast-upper-gastrointestinal-barium-x-ray-radiography
#11
Kimihiko Endo, Hiroshi Nakada, Yoshihito Kadota, Youichi Mizutani, Norihiro Shinkawa, Koji Onoe, Naoki Yoshinaga, Minako Azuma, Toshinori Hirai
PURPOSE: To identify risk factors for atrophic gastritis in Japanese young and middle-age subjects by double-contrast upper gastrointestinal barium X-ray radiography (UGI-XR). MATERIALS AND METHODS: We included 351 consecutive Japanese subjects (158 males, 193 females; age 25-49 years, mean 44 years) seen between October 2014 and March 2016. All underwent serum Helicobacter pylori (Hp) antibody- and UGI-XR examinations. Two radiologists independently recorded their UGI-XR findings of atrophic gastritis (AG)...
September 27, 2018: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/30238278/ct-based-mediastinal-compartment-classifications-and-differential-diagnosis-of-mediastinal-tumors
#12
REVIEW
Takahiko Nakazono, Ken Yamaguchi, Ryoko Egashira, Yukari Takase, Junichi Nojiri, Masanobu Mizuguchi, Hiroyuki Irie
Division of the mediastinum into compartments is used to help narrow down the differential diagnosis of mediastinal tumors, assess tumor growth, and plan biopsies and surgical procedures. There are several traditional mediastinal compartment classification systems based upon anatomical landmarks and lateral chest radiograph. Recently, the Japanese Association of Research of the Thymus (JART) and the International Thymic Malignancy Interest Group (ITMIG) proposed new mediastinal compartment classification systems based on transverse CT images...
September 20, 2018: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/30232585/artificial-intelligence-using-neural-network-architecture-for-radiology-ainnar-classification-of-mr-imaging-sequences
#13
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
https://www.readbyqxmd.com/read/30218253/definitive-radiotherapy-for-hilar-and-or-mediastinal-lymph-node-metastases-after-stereotactic-body-radiotherapy-or-surgery-for-stage-i-non-small-cell-lung-cancer-5-year-results
#14
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
https://www.readbyqxmd.com/read/30218252/three-dimensional-computed-tomographic-angiography-with-computed-tomographic-colonography-for-laparoscopic-colorectal-surgery
#15
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
https://www.readbyqxmd.com/read/30206802/combined-radiotherapy-with-nivolumab-for-extracranial-metastatic-malignant-melanoma
#16
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
https://www.readbyqxmd.com/read/30251115/standardization-of-f-18-fdg-pet-ct-for-response-evaluation-by-the-radiologic-society-of-north-america-quantitative-imaging-biomarker-alliance-rsna-qiba-profile-preliminary-results-from-the-japan-qiba-j-qiba-activities-for-asian-international-multicenter-phase
#17
Hyeyeol Bae, Junichi Tsuchiya, Takehito Okamoto, Ikuko Ito, Yusuke Sonehara, Fumiko Nagahama, Kazunori Kubota, Ukihide Tateishi
PURPOSE: In an Asian international multicenter phase II trial conducted in patients with peripheral T-cell lymphoma (PTCL), [F-18]FDG-PET/CT was used for evaluation of the therapeutic response. Standardization of the PET/CT scanners was necessary before patient enrollment. We therefore standardized the scanners by phantom tests based on the profile approved by the Quantitative Imaging Biomarkers Alliance (QIBA) of Radiological Society of North America (RSNA). MATERIALS AND METHODS: The tests were conducted on 12 scanners in 12 facilities in compliance with the QIBA Profile and used National Electrical Manufacturers Association (NEMA) International Electrotechnical Commission (IEC) body phantoms...
November 2018: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/30232584/post-marketing-surveillance-of-gadobutrol-for-contrast-enhanced-magnetic-resonance-imaging-in-japan
#18
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...
November 2018: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/30194586/internal-mammary-lymph-node-metastases-in-breast-cancer-what-should-radiologists-know
#19
REVIEW
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...
November 2018: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/30173283/improvement-in-radiological-reading-efficiency-and-residents-education-and-clinical-contribution-using-the-modified-reading-system-triage-reader
#20
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...
November 2018: Japanese Journal of Radiology
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