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Japanese Journal of Radiology

Yoshimitsu Ohgiya, Noritaka Seino, Shingo Miyamoto, Nobuyuki Takeyama, Kumi Hatano, Jiro Munechika, Kumiko Ishizuka, Masanori Hirose, Nobuyuki Ohike, Toshi Hashimoto, Akihiko Sekizawa, Takehiko Gokan
PURPOSE: To evaluate the usefulness of computed tomographic (CT) features for identifying acute torsion of uterine subserosal leiomyoma (USL). SUBJECTS AND METHODS: We analyzed contrast-enhanced CT examinations of 7 USLs with torsion and 44 USLs without torsion. Two radiologists evaluated the CT features, which consisted of poor contrast enhancement inside the USL, thin rim enhancement around the USL, calcification within the USL, a beak sign between the uterus and USL, fan-shaped poor contrast enhancement in the uterus area adjacent to the USL (dark fan sign), and ascites...
December 9, 2017: Japanese Journal of Radiology
Noriyuki Tomiyama, Kei Yamada, Yoshiyuki Watanabe, Hiroshi Honda
No abstract text is available yet for this article.
December 5, 2017: Japanese Journal of Radiology
Kaan Esen, Anil Ozgur, Yuksel Balci, Sermin Tok, Engin Kara
OBJECTIVE: To investigate the anatomical variations in the origins of the thyroid arteries on CT angiography images. METHODS: The presence and the origins of the superior thyroid artery, the inferior thyroid artery, and the thyroidea ima artery were retrospectively evaluated based on carotid CT angiography examinations. The bifurcation level of the common carotid artery with respect to the cervical vertebrae and disc spaces was also determined. A total of 640 patients were included in the study...
December 4, 2017: Japanese Journal of Radiology
Shunji Mugikura, Hirokazu Kikuchi, Miki Fujimura, Etsuro Mori, Shoki Takahashi, Kei Takase
Since the 1950s, amnesia or memory impairment has been repeatedly reported in patients following surgical repair of anterior communicating artery (ACoA) aneurysms. Postoperative infarctions following surgical repair of ACoA aneurysms are classified as involvement of the subcallosal artery (the largest unpaired perforator of the ACoA), the recurrent artery of Heubner (RAH), or a combination of both. Postoperative amnesia can seriously affect the patient's quality of life, thus prompting physicians to discuss the symptomatology of the three infarction patterns...
November 23, 2017: Japanese Journal of Radiology
Onur Taydas, Emre Unal, Ali Devrim Karaosmanoglu, Mehmet Ruhi Onur, Erhan Akpinar
PURPOSE: To investigate whether computed tomography (CT)-based scoring systems obtained within 72 h of symptoms onset can predict disease course in acute pancreatitis. METHODS: Between October 2007 and December 2015, 189 patients (age range 21-93 years) who underwent abdominopelvic CT for the diagnosis of acute pancreatitis were included in the study. Balthazar grade and original and modified versions of CT severity index (CTSI) measurements were carried out for each patient...
November 21, 2017: Japanese Journal of Radiology
Michiro Sasaki, Mitsuhiro Tozaki, Kazunori Kubota, Wakana Murakami, Daisuke Yotsumoto, Yasuaki Sagara, Yasuyo Ohi, Shunichi Oosako, Yoshiaki Sagara
PURPOSE: To compare standardized uptake value (SUV) and apparent diffusion coefficient (ADC) values acquired using a PET/MRI scanner in breast cancer patients. MATERIALS AND METHODS: Whole-body PET/MRI and breast PET/MRI were performed in 108 consecutive patients. Ninety-four patients who had a total of 100 breast cancers were analyzed. SUVmax and ADCmean acquired using breast PET/MRI were compared with pathologic prognostic factors. RESULTS: All the lesions were visually detectable using PET and diffusion-weighted imaging (DWI) on breast PET/MRI; however, lesions were visually undetectable on whole-body DWI in 13 patients (13%) or on whole-body PET in 7 patients (7%)...
November 20, 2017: Japanese Journal of Radiology
Satomi Kitai, Takako Kiyokawa, Yumiko O Tanaka, Kaoru Onoue, Hiroyuki Takahashi, Motoaki Saitou, Aikou Okamoto, Kunihiko Fukuda
PURPOSE: To clarify the MRI findings for primary fallopian tube cancer (PFTC). MATERIALS AND METHODS: MRI findings for 11 patients who were pathologically diagnosed with PFTC at our institute were retrospectively reviewed. MRI findings (shape, appearance, signal intensity, ADC value, enhancement patterns, and location of the primary tumor, the morphologic appearance of the ipsilateral ovary, and intrauterine fluid collection) were evaluated and compared with pathological findings including histological subtype and PFTC location...
November 18, 2017: Japanese Journal of Radiology
Serra Ozbal Gunes, Yeliz Akturk
PURPOSE: The aims of this study were (a) to determine whether a coronal oblique length (COL) > 12 cm, which is often used to detect splenomegaly (SM) on ultrasound, can be used as a marker of SM on computed tomography (CT), (b) to compare the diagnostic accuracy of COL with other unidimensional linear measurements (ULM) in identifying SM, (c) to determine which ULM most closely correlates with splenic volume (SVol) according to the splenic index on CT, (d) to assess the relationship between SVol and patient's gender, age and body parameters (height, weight), and (e) to determine whether there is a difference between non-contrast-enhanced and contrast-enhanced CT images in identifying SM...
November 16, 2017: Japanese Journal of Radiology
Norihito Naruto, Toshihide Itoh, Kyo Noguchi
Dual energy CT (DECT) is a promising technology that provides better diagnostic accuracy in several brain diseases. DECT can generate various types of CT images from a single acquisition data set at high kV and low kV based on material decomposition algorithms. The two-material decomposition algorithm can separate bone/calcification from iodine accurately. The three-material decomposition algorithm can generate a virtual non-contrast image, which helps to identify conditions such as brain hemorrhage. A virtual monochromatic image has the potential to eliminate metal artifacts by reducing beam-hardening effects...
November 9, 2017: Japanese Journal of Radiology
Keita Sakamoto, Noriko Oyama-Manabe, Osamu Manabe, Tadao Aikawa, Yasuka Kikuchi, Harue Sasai-Masuko, Masanao Naya, Kohsuke Kudo, Fumi Kato, Nagara Tamaki, Hiroki Shirato
PURPOSE: To evaluate heterogeneity of myocardial contraction in relation to extensive late gadolinium enhancement (LGE) in hypertrophic cardiomyopathy (HCM) patients with preserved left ventricular ejection fraction, using fast strain-encoded magnetic resonance imaging. MATERIALS AND METHODS: Twenty-two HCM patients and 24 age-matched control subjects were included in this retrospective study. The regional and global peak values of longitudinal and circumferential strain (LSregional, LSglobal, CSregional, CSglobal), and their regional heterogeneities were evaluated using coefficients of variation (LSCoV, CSCoV) in relation to LGE...
November 9, 2017: Japanese Journal of Radiology
Simon Sin Man Wong, James Siu Wai Cheung, Tom Wai Kin Lee, Chris Siu Chun Tsai, Alex Wing Hung Ng
PURPOSE: To retrospectively review the imaging characteristics of CT artefacts due to air bubbles within the oil cooling system of the X-ray tube housing. MATERIALS AND METHODS: Air bubbles were introduced into the oil cooling system of the X-ray tube housing during tube replacement in one of the CT scanners in the authors' institution. All 126 CT brain studies performed in this period were retrospectively reviewed. One hundred and four studies were negative for artefacts...
November 8, 2017: Japanese Journal of Radiology
Kyohei Nagata, Ryoichi Tanaka, Hidenobu Takagi, Tetuya Fusazaki, Yoshihiro Morino, Kunihiro Yoshioka
PURPOSE: To assess the utility of transluminal attenuation gradient (TAG) in combination with coronary computed tomography angiography (CTA) for detecting obstructive coronary artery stenosis. MATERIALS AND METHODS: We retrospectively evaluated coronary CTA data in 35 consecutive patients who underwent invasive coronary angiography (ICA). We compared the diagnostic performance of TAG with that of quantitative coronary angiography, which we used as the reference standard...
November 6, 2017: Japanese Journal of Radiology
Cem Onal, Yemliha Dölek, Berna Akkuş Yıldırım
PURPOSE: To compare dosimetric data for the planning target volume (PTV) and organs at risk (OARs) between 3-dimensional conformal radiotherapy (3DCRT), volumetric modulated arc therapy (VMAT), and helical tomotherapy [1]. MATERIALS AND METHODS: The dosimetric data for 15 gastric cancer patients treated with 3DCRT, VMAT, or HT techniques were used. Cumulative dosimetric parameters, homogeneity index (HI), and conformal index (CI) were compared for the PTV and OARs...
November 3, 2017: Japanese Journal of Radiology
Tomohiro Takamura, Masaaki Hori, Koji Kamagata, Kanako K Kumamaru, Ryusuke Irie, Akifumi Hagiwara, Nozomi Hamasaki, Shigeki Aoki
PURPOSE: To assess the influence of high temporal resolution on the perfusion measurements and image quality of perfusion maps, by applying simultaneous-multi-slice acquisition (SMS) dynamic susceptibility contrast-enhanced (DSC) magnetic resonance imaging (MRI). MATERIALS AND METHODS: DSC-MRI data using SMS gradient-echo echo planar imaging sequences in 10 subjects with no intracranial abnormalities were retrospectively analyzed. Three additional data sets with temporal resolution of 1...
October 31, 2017: Japanese Journal of Radiology
Ryo Toya, Tetsuo Saito, Yoshinobu Shimohigashi, Yohei Yotsuji, Tomohiko Matsuyama, Takahiro Watakabe, Yudai Kai, Yasuyuki Yamashita, Natsuo Oya
PURPOSE: We describe a treatment method with four-dimensional cone-beam computed tomography (4D-CBCT)-guided radiotherapy for gastric lymphoma. MATERIALS AND METHODS: We performed image-guided radiotherapy (IGRT) with 15 fractions for a gastric mucosa-associated lymphoid tissue lymphoma patient, using 4D-CBCT. The stomach was delineated based on 4D-CT images. For image guidance, an automatic registration between planning CT and 4D-CBCT images was performed based on the bony anatomy (bone matching), followed by manual registration based on the stomach in 4D-CBCT images of all 10 phases (4D matching)...
October 30, 2017: Japanese Journal of Radiology
Kwangdon Kim, Kisung Lee, Hakjae Lee, Sungkwan Joo, Jungwon Kang
PURPOSE: We aimed to develop a gap-filling algorithm, in particular the filter mask design method of the algorithm, which optimizes the filter to the imaging object by an adaptive and iterative process, rather than by manual means. METHODS: Two numerical phantoms (Shepp-Logan and Jaszczak) were used for sinogram generation. The algorithm works iteratively, not only on the gap-filling iteration but also on the mask generation, to identify the object-dedicated low frequency area in the DCT-domain that is to be preserved...
October 30, 2017: Japanese Journal of Radiology
Hideyuki Morimoto, Yushi Fujiwara, Shigeru Lee, Kosuke Amano, Masako Hosono, Yukio Miki, Harushi Osugi
PURPOSE: We evaluated the effectiveness of neoadjuvant chemoradiotherapy (CRT) followed by esophagectomy for cT4 esophageal cancer or lymph node metastases (LNM) invading adjacent structures. MATERIALS AND METHODS: We retrospectively evaluated 42 consecutive patients with thoracic esophageal cancer who underwent CRT followed by esophagectomy between 2008 and 2013. All were initially considered to be unresectable because of cT4 (n = 32) disease or LN invasion (n = 10)...
October 28, 2017: Japanese Journal of Radiology
Nuri Kaydıhan, Kimia Çepni, Şefika Arzu Ergen, Mustafa Şükrü Şenocak, Didem Çolpan Öksüz
PURPOSE: Our objective was to analyze kidney damage using glomerular filtration rate (GFR) and dynamic renal scintigraphy (DRS) compared with dose volume histogram (DVH) parameters in gastric cancer patients. MATERIALS AND METHODS: Twenty-two gastric cancer patients treated with postoperative chemoradiotherapy were retrospectively evaluated. Student's t test was used to compare pre- and posttreatment GFR and creatinine values. The relative contribution of the left and right kidney in DRS results was expressed as left-to-right ratio (L/R), and the percentage of initial and control participation ratio difference was calculated...
October 24, 2017: Japanese Journal of Radiology
Lei Zhao, Aishi Liu, Youmin Guo
PURPOSE: To optimize and evaluate an ultra-low-dose (ULD) technique for CT coronary angiography (CTCA). MATERIALS AND METHODS: Eighty-two patients were randomly divided into two groups. ULD and routine CTCA were performed in groups A and B. Image quality, radiation dose and contrast agent were evaluated. RESULTS: The effective dose (ED) was 0.20 ± 0.01 mSv for the ULD technique, a decrease of 87% (t = - 21.182, P < 0.001) compared with the control group...
October 19, 2017: Japanese Journal of Radiology
Yuko Iraha, Masahiro Okada, Masafumi Toguchi, Kimei Azama, Keiko Mekaru, Tadatsugu Kinjo, Wataru Kudaka, Yoichi Aoki, Hajime Aoyama, Akiko Matsuzaki, Sadayuki Murayama
Secondary postpartum hemorrhage (PPH) and postabortion hemorrhage are rare complications. Retained products of conception (RPOC) is among the most common causes of both secondary PPH and postabortion hemorrhage. Other less common causes of secondary PPH are uterine vascular abnormalities such as arteriovenous malformations and pseudoaneurysms. These are usually related to a history of a procedure such as dilation and curettage or cesarean delivery. Subinvolution of the placental site is an idiopathic cause of secondary PPH; this condition may be underrecognized and therefore could have a higher incidence than currently reported...
October 19, 2017: Japanese Journal of Radiology
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