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Japanese Journal of Radiology

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https://www.readbyqxmd.com/read/28550357/apparent-diffusion-coefficient-in-differentiation-of-pediatric-posterior-fossa-tumors
#1
Soubhi Zitouni, Gonca Koc, Selim Doganay, Sibel Saracoglu, Kazim Z Gumus, Saliha Ciraci, Abdulhakim Coskun, Ekrem Unal, Huseyin Per, Ali Kurtsoy, Olgun Kontas
PURPOSE: To investigate the contribution of preoperative apparent diffusion coefficient (ADC) values in the differential diagnosis of pediatric posterior fossa tumors. METHODS: Forty-two pediatric patients (mean age 7.76 ± 4.58 years) with intra-axial tumors in the infra-tentorial region underwent magnetic resonance imaging. ADC measurement was performed using regions of interest, obtained from the solid component of the mass lesions. ADC ratios were calculated by dividing the ADC values from the mass lesions by the ADC values from normal cerebellar parenchyma...
May 26, 2017: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/28550356/orbital-malignant-lesions-in-adults-multiparametric-mr-imaging
#2
Bo Sun, Liyuan Song
PURPOSE: To assess the benefit of combining diffusion-weighted imaging and dynamic contrast-enhanced (DCE) MR imaging in the preoperative evaluation of orbital lymphoma and other malignancies in adults. MATERIALS AND METHODS: This retrospective study was institutional review board-approved and informed consent was waived. Pretreatment MR imaging was performed in 52 patients with malignant orbital lesions. Apparent diffusion coefficient (ADC) and DCE MR parameters were evaluated in 30 patients with orbital lymphoma and 22 patients with other orbital malignancies...
May 26, 2017: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/28550355/coronary-computed-tomography-angiography-using-128-slice-dual-source-computed-tomography-in-patients-with-severe-calcification
#3
Suguru Sato, Yosuke Horii, Norihiko Yoshimura, Takuya Yagi, Hidefumi Aoyama
PURPOSE: To compare coronary computed tomography angiography (CTA) and coronary angiography (CAG) with regard to luminal graphic definition of calcified segments using 128-slice dual-source computed tomography (DSCT), specifically for patients with an Agatston score >400. MATERIALS AND METHODS: Of 1148 consecutive patients who underwent coronary CTA using a 128-slice DSCT, 132 subjects had severe calcification with an Agatston score >400. Thirty-nine of the 132 patients who had undergone CAG within 3 months before or after coronary CTA were included...
May 26, 2017: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/28540464/comparison-of-lesion-enhancement-between-bb-cube-and-3d-spgr-images-for-brain-tumors-with-1-5-t-magnetic-resonance-imaging
#4
Hirokazu Hasegawa, Ryuichiro Ashikaga, Kaoru Okajima, Tetsuya Wakayama, Mitsuharu Miyoshi, Yasumasa Nishimura, Takamichi Murakami
PURPOSE: This study aimed to compare the detectability of neoplastic lesion enhancement after gadolinium-based contrast media injection in three-dimensional T1-weighted black blood Cube (3D-T1W BB Cube) and three-dimensional T1-weighted fast spoiled gradient-echo (3D-T1W fast SPGR) images obtained with 1.5-T magnetic resonance imaging (MRI). MATERIALS AND METHODS: Phantom and clinical studies were performed to compare the lesion detectability and contrast ratio (CR) between 3D-T1W BB Cube and 3D-T1W fast SPGR pulse sequences...
May 24, 2017: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/28528467/changes-in-deviation-of-absorbed-dose-to-water-among-users-by-chamber-calibration-shift
#5
Tetsurou Katayose, Hidetoshi Saitoh, Mitsunobu Igari, Weishan Chang, Shimpei Hashimoto, Mie Morioka
PURPOSE: The JSMP01 dosimetry protocol had adopted the provisional (60)Co calibration coefficient [Formula: see text], namely, the product of exposure calibration coefficient N C and conversion coefficient k D,X. After that, the absorbed dose to water D w standard was established, and the JSMP12 protocol adopted the [Formula: see text] calibration. In this study, the influence of the calibration shift on the measurement of D w among users was analyzed. MATERIALS AND METHODS: The intercomparison of the D w using an ionization chamber was annually performed by visiting related hospitals...
May 20, 2017: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/28528466/utility-of-mr-imaging-in-the-evaluation-of-colon-cancer-emphasis-on-distinguishing-tumor-tissue-from-fibrosis-and-role-of-contrast-media
#6
LETTER
Akitoshi Inoue, Shinichi Ohta, Norihisa Nitta, Masahiro Yoshimura, Tomoharu Shimizu, Masaji Tani, Ryoji Kushima, Kiyoshi Murata
No abstract text is available yet for this article.
May 20, 2017: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/28528465/contrast-induced-nephropathy-cin-of-patients-with-renal-dysfunction-in-ct-examination
#7
Yasuhiro Fukushima, Hitomi Miyazawa, Junpei Nakamura, Ayako Taketomi-Takahashi, Takayuki Suto, Yoshito Tsushima
PURPOSE: To investigate the incidence and risk factors of contrast induced nephropathy (CIN) after contrast enhanced (CE) computed tomography (CT) in patients with renal dysfunction. MATERIALS AND METHODS: Two hundred sixteen inpatients with estimated glomerular filtration rates (eGFR) <60 ml/min/1.73 m(2) underwent CE CT using iodine doses of 420 or 480 mg I/kg. Data of all enrolled patients was collected for baseline serum creatinine level (SCr), post-CE CT SCr within 3 days after CE CT, and conditions considered risk factors for CIN [renal dysfunction, contrast media dose, advanced age, diabetes mellitus, no intravenous hydration, cardiac dysfunction (left ventricular ejection fraction <60%) and intensive-care unit (ICU) admission]...
May 20, 2017: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/28501975/changes-in-liver-perfusion-and-function-before-and-after-percutaneous-occlusion-of-spontaneous-portosystemic-shunt
#8
Yasukazu Kako, Koichiro Yamakado, Wataru Jomoto, Toshiya Nasada, Koichiro Asada, Haruyuki Takaki, Kaoru Kobayashi, Takashi Daimon, Shozo Hirota
PURPOSE: To evaluate changes in liver perfusion after occlusion of spontaneous portosystemic shunt and to analyze mechanisms of liver profile improvement. MATERIALS AND METHODS: Liver function changes and portal venous and hepatic arterial blood flow were evaluated using perfusion CT before and after shunt occlusion in 23 patients who underwent percutaneous occlusion of spontaneous portosystemic shunt because of gastric varices (n = 15) or hepatic encephalopathy (n = 8)...
May 13, 2017: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/28497349/suv-navigator-enables-rapid-18-f-fdg-pet-ct-image-interpretation-compared-with-2d-roi-and-3d-voi-evaluations
#9
Atsutaka Okizaki, Michihiro Nakayama, Shunta Ishitoya, Kaori Nakajima, Masaaki Yamashina, Tamio Aburano, Koji Takahashi
PURPOSE: Positron emission tomography (PET) and the maximum standardized uptake value (SUVmax) is a useful technique for assessing malignant tumors. Measurements of SUVmax in multiple lesions per patient frequently require many time-consuming procedures. To address this issue, we designed a novel interface named SUV Navigator (SUVnavi), and the purpose of this study was to investigate its utility. MATERIALS AND METHODS: We measured SUVmax in 661 lesions from 100 patients with malignant tumors...
May 11, 2017: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/28488205/the-value-of-initial-sonography-compared-to-supplementary-ct-for-diagnosing-right-sided-colonic-diverticulitis
#10
Ju Hwa Min, Hyun Cheol Kim, Sang Won Kim, Dal Mo Yang, Sun Jung Rhee, Jiyoung Oh, Sung Eun Ahn
PURPOSE: The purpose of the study was to assess the value of initial sonography in the diagnosis of right-sided colonic diverticulitis in comparison with supplementary CT. MATERIALS AND METHODS: A total of 183 consecutive adult patients with right lower quadrant pain (73 diverticulitis, and 110 non-diverticulitis) who underwent both initial sonography and subsequent CT within 24 h were enrolled in this study. Two reviewers retrospectively assessed imaging findings of diverticula, colonic wall thickening, inflammatory pericolic fat, and pericolic abscess for each sonography and CT and then classified each case as non-diverticulitis, simple diverticulitis or complicated diverticulitis...
May 9, 2017: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/28474300/uncertainty-of-cosmetic-evaluation-after-accelerated-partial-breast-irradiation-interim-analysis-of-a-japanese-prospective-multi-institutional-feasibility-study
#11
Eisaku Yoden, Takayuki Nose, Yuki Otani, Shuuji Asahi, Iwao Tsukiyama, Takushi Dokiya, Toshiaki Saeki, Ichirou Fukuda, Hiroshi Sekine, Naoto Shikama, Yu Kumazaki, Takao Takahashi, Ken Yoshida, Tadayuki Kotsuma, Norikazu Masuda, Kazutaka Nakashima, Taisei Matsumura, Shino Nakagawa, Seiji Tachiiri, Yoshio Moriguchi, Jun Itami, Masahiko Oguchi
PURPOSE: We conducted a multi-institutional prospective study on accelerated partial breast irradiation (APBI) using interstitial brachytherapy. The clinical results over a minimum follow-up period of 30 months are presented here. MATERIALS AND METHODS: Forty-six patients with breast cancer were treated with breast-conserving surgery and postoperative APBI. After confirmation of negative surgical margins and negative lymph nodes, a high-dose-rate brachytherapy protocol of 36 Gy/6 fractions was carried out...
May 4, 2017: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/28451938/quantitative-accuracy-of-computed-tomography-perfusion-under-low-dose-conditions-measured-using-a-hollow-fiber-phantom
#12
Kazufumi Suzuki, Hiroyuki Hashimoto, Eiji Okaniwa, Hiroshi Iimura, Shingo Suzaki, Kayoko Abe, Shuji Sakai
PURPOSE: The purpose of this study was to investigate the quantitative accuracy under low-dose conditions on computed tomography (CT) perfusion using a hollow-fiber phantom that had the theoretical absolute values of perfusion indices. MATERIALS AND METHODS: Our phantom comprised two components, i.e., a hollow-fiber hemodialyzer to pump the diluted contrast material and a surrounding syringe-shaped X-ray-absorbing body to simulate the absorption of X-rays by a brain and cranium...
April 27, 2017: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/28451937/thin-section-ct-findings-of-thoracolithiasis
#13
Thitiporn Suwatanapongched, Chayanin Nitiwarangkul
PURPOSE: To review thin-section CT findings of thoracolithiasis. MATERIALS AND METHODS: Thirty-three thin-section CT scans of 9 patients with thoracolithiasis diagnosed between 2008 and 2016 were reviewed for the location, shape, longest diameter, and calcification of each freely mobile nodule (thoracolith) and for the presence of coexisting abnormalities. RESULTS: The mean age of 9 patients (5 women) was 65.8 years (SD 14.9; range 37-83 years)...
April 27, 2017: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/28447317/neuroimaging-findings-of-postnatally-acquired-zika-virus-infection-a-pictorial-essay
#14
Mohammad Zare Mehrjardi, Guillaume Carteaux, Andrea Poretti, Morteza Sanei Taheri, Sonia Bermudez, Heron Werner, Luiz Celso Hygino da Cruz
Zika virus (ZIKV) is a mosquito-borne arbovirus from the Flaviviridae family, first discovered in 1947. There has been no report of severe complications caused by this virus in humans until recently. However, it is confirmed now that prenatally acquired ZIKV infection may cause severe congenital brain abnormalities in the infected fetuses. In addition, there has been an increasing number of reports during recent years about the causal relationship between postnatally acquired ZIKV infection and severe neurologic complications (mostly immune-mediated ones)...
April 26, 2017: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/28421397/comparison-between-the-four-field-box-and-field-in-field-techniques-for-conformal-radiotherapy-of-the-esophagus-using-dose-volume-histograms-and-normal-tissue-complication-probabilities
#15
Farzaneh Allaveisi, Amir Nami Moghadam
PURPOSE: We evaluated and compared the performance of the field-in-field (FIF) to that of the four-field box (4FB) technique regarding dosimetric and radiobiological parameters for radiotherapy of esophageal carcinoma. MATERIALS AND METHODS: Twenty patients with esophageal cancer were selected. For each patient, two treatment plans were created: 4FB and FIF. The parameters compared included the conformity index (CI), homogeneity index (HI), D mean, D max, tumor control probability (TCP), V 20Gy and V 30Gy of the heart and lungs, normal tissue complication probability (NTCP), and monitor units per fraction (MU/fr)...
April 18, 2017: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/28421396/-11-c-methionine-pet-ct-findings-in-benign-brain-disease
#16
REVIEW
Reiko Nakajima, Ken Kimura, Koichiro Abe, Shuji Sakai
(11)C-methionine (MET) is one of the most commonly used positron emission tomography (PET) tracers for evaluation of malignant brain tumor, with MET-PET being a sensitive technique for visualization of primary and recurrent malignant brain tumors. However, previous reports have demonstrated MET uptake in lesions associated with benign brain diseases. These diseases usually show an increase in MET uptake similar to that of malignant tumors. This pitfall in MET-PET image interpretation is important not only for nuclear medicine professionals, but also for radiologists...
April 18, 2017: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/28421395/clinical-interpretation-of-asymptomatic-medial-collateral-ligament-injury-observed-on-magnetic-resonance-imaging-in-adolescent-baseball-players
#17
Kenta Tanaka, Yoshikazu Okamoto, Takeshi Makihara, Kiyoshi Maehara, Tomohiro Yoshizawa, Manabu Minami, Masashi Yamazaki
PURPOSE: Magnetic resonance imaging (MRI) of medial collateral ligament (MCL) injury of the elbow was often observed in asymptomatic adolescent baseball players. We aimed to clarify the clinical interpretation of "asymptomatic MCL injury observed on MRI" by comparing MRI, ultrasonography (US), and physical findings. MATERIALS AND METHODS: Sixty-four asymptomatic adolescent baseball players (mean 11.2 years) were enrolled. An open-type 0.2T MRI was used. MCL function was evaluated by measuring the opening of the ulnohumeral joint using US...
April 18, 2017: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/28386823/modifying-the-planning-target-volume-to-optimize-the-dose-distribution-in-dynamic-conformal-arc-therapy-for-large-metastatic-brain-tumors
#18
Kengo Ogura, Yasuhiro Kosaka, Toshiyuki Imagumbai, Kazuhito Ueki, Ryo Narukami, Takayuki Hattori, Masaki Kokubo
PURPOSE: When treating large metastatic brain tumors with stereotactic radiotherapy (SRT), high dose conformity to target is difficult to achieve. Employing a modified planning target volume (mPTV) instead of the original PTV may be one way to improve the dose distribution in linear accelerator-based SRT using a dynamic conformal technique. In this study, we quantitatively analyzed the impact of a mPTV on dose distribution. MATERIALS AND METHODS: Twenty-four tumors with a maximum diameter of >2 cm were collected...
April 6, 2017: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/28374213/contour-variations-of-the-body-and-tail-of-the-pancreas-evaluation-with-mdct
#19
Ahmad Khalid Omeri, Shunro Matsumoto, Maki Kiyonaga, Ryo Takaji, Yasunari Yamada, Kazuhisa Kosen, Hiromu Mori, Hidetoshi Miyake
PURPOSE: To analyze morphology/contour variations of the pancreatic body and tail in subjects free of pancreatic disease. METHODS: We retrospectively reviewed triple-phase, contrast-enhanced multi-detector row computed tomography (3P-CE-MDCT) examinations of 449 patients who had no clinical or CT evidence of pancreatic diseases. These patients were evaluated for morphologic/contour variations of the pancreatic body and tail, which were classified into two types...
April 3, 2017: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/28342041/utility-of-mr-imaging-in-the-evaluation-of-colon-cancer
#20
LETTER
Ali Kemal Sivrioglu, Serkan Aribal, Hakan Onder, Suzan Deniz Onol
No abstract text is available yet for this article.
March 24, 2017: Japanese Journal of Radiology
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