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Magnetic Resonance in Medical Sciences: MRMS

Ken Yamaguchi, Takahiko Nakazono, Ryoko Egashira, Yoshiaki Komori, Jun Nakamura, Tomoyuki Noguchi, Hiroyuki Irie
PURPOSE: To assess the diagnostic performance of readout-segmented echo-planar diffusion tensor imaging (DTI based on rs-EPI) for breast cancer and to determine the correlation between the apparent diffusion coefficient (ADC) and fractional anisotropy (FA) values obtained from DTI based on rs-EPI with prognostic markers of invasive breast cancer. MATERIALS AND METHODS: This retrospective study examined 80 pathologically proven breast lesions (22 benign and 58 malignant lesions) of 80 patients who underwent both diffusion-weighted imaging based on single-shot echo-planar imaging (DWI based on ss-EPI) and DTI based on rs-EPI with b-values of 0 and 1000...
November 16, 2016: Magnetic Resonance in Medical Sciences: MRMS
Koung Mi Kang, Seung Hong Choi, Dong Eun Kim, Tae Jin Yun, Ji-Hoon Kim, Chul-Ho Sohn, Sun-Won Park
PURPOSE: To prospectively evaluate whether cardiac gating can improve the reproducibility of intravoxel incoherent motion (IVIM) parameters in the head and neck, we performed IVIM diffusion-weighted imaging (DWI) using 4 b values (4b), 4 b values with cardiac gating (4b gating) and 17 b values (17b). METHODS: We performed IVIM DWI twice per person on nine healthy volunteers using 4b, 4b gating and 17b and five patients with head and neck masses using 4b gating and 17b...
November 4, 2016: Magnetic Resonance in Medical Sciences: MRMS
Chisato Matsuo-Hagiyama, Yoshiyuki Watanabe, Hisashi Tanaka, Hiroto Takahashi, Atsuko Arisawa, Eri Yoshioka, Shin Nabatame, Sayaka Nakano, Noriyuki Tomiyama
PURPOSE: Silent magnetic resonance imaging (MRI) scans produce reduced acoustic noise and are considered more gentle for sedated children. The aim of this study was to compare the validity of T1- (T1W) and T2-weighted (T2W) silent sequences for myelination assessment in children with conventional spin-echo sequences. MATERIALS AND METHODS: A total of 30 children (21 boys, 9 girls; age range: 1-83 months, mean age: 35.5 months, median age: 28.5 months) were examined using both silent and spin-echo sequences...
October 31, 2016: Magnetic Resonance in Medical Sciences: MRMS
Yoshihito Kadota, Toshinori Hirai, Hideo Nakamura, Keishi Makino, Shigetoshi Yano, Shinichiro Nishimura, Machiko Tateishi, Minako Azuma, Mika Kitajima, Yasuyuki Yamashita
PURPOSE: We aimed to determine whether 3T diffusion-weighted imaging (DWI) has an additive value relative to contrast-enhanced MR imaging for the detection of disseminated lesions in patients with primary malignant brain tumors. METHODS: We included consecutive 12 patients with nodular disseminated lesions of primary malignant brain tumors that were confirmed by surgery or follow-up MR imaging. All underwent conventional MR imaging, DWI at b = 1000 and 3000 s/mm(2), post-contrast T1-weighted and 3D gradient-echo imaging at 3T...
October 11, 2016: Magnetic Resonance in Medical Sciences: MRMS
Zaw Aung Khant, Toshinori Hirai, Yoshihito Kadota, Rie Masuda, Takanori Yano, Minako Azuma, Yukiko Suzuki, Kuniyuki Tashiro
We report a 34-year-old male who manifested T1 shortening of the cerebral cortices after more than 86 contrast-enhanced MRI studies. We observed high-signal intensity (SI) on T1-weighted images (T1WIs) not only in the globus pallidus, dentate nucleus, and pulvinar of thalamus, but also in the cortices of the pre- and post-central gyri and around the calcarine sulcus. High SI in the cerebral cortices was not clearly demonstrated on T1WI scans performed 11 years earlier. The high SI we observed in these areas of the brain corresponded to areas with a normal iron-deposition predilection...
October 11, 2016: Magnetic Resonance in Medical Sciences: MRMS
Kengo Yoshimitsu, Yoshinobu Shinagawa, Toshimichi Mitsufuji, Emi Mutoh, Hiroshi Urakawa, Keiko Sakamoto, Ritsuko Fujimitsu, Koichi Takano
PURPOSE: To elucidate whether any differences are present in the stiffness map obtained with a multiscale direct inversion algorithm (MSDI) vs that with a multimodel direct inversion algorithm (MMDI), both qualitatively and quantitatively. MATERIALS AND METHODS: The MR elastography (MRE) data of 37 consecutive patients who underwent liver MR elastography between September and October 2014 were retrospectively analyzed by using both MSDI and MMDI. Two radiologists qualitatively assessed the stiffness maps for the image quality in consensus, and the measured liver stiffness and measurable areas were quantitatively compared between MSDI and MMDI...
October 11, 2016: Magnetic Resonance in Medical Sciences: MRMS
Kyoung-Nam Kim, Sang-Doc Han, Jeung-Hoon Seo, Phil Heo, Dongkyeom Yoo, Geun Ho Im, Jung Hee Lee
The birdcage (BC) coil is currently being utilized for uniform radiofrequency (RF) transmit/receive (Tx/Rx) or Tx-only configuration in many magnetic resonance (MR) imaging applications, but insufficient magnetic flux (|B1|) density and their non-uniform distribution still exists in high-field (HF) environments. We demonstrate that the asymmetric birdcage (ABC) transmit/receive (Tx/Rx) volume coil, which is a modified standard birdcage (SBC) coil with the end ring split into two halves, is suitable for improving the |B1| sensitivity in 7T small-animal MR imaging...
September 30, 2016: Magnetic Resonance in Medical Sciences: MRMS
Kohsuke Kudo, Ikuko Uwano, Toshinori Hirai, Ryuji Murakami, Hideo Nakamura, Noriyuki Fujima, Fumio Yamashita, Jonathan Goodwin, Satomi Higuchi, Makoto Sasaki
PURPOSE: The purpose of the present study was to compare different software algorithms for processing DSC perfusion images of cerebral tumors with respect to i) the relative CBV (rCBV) calculated, ii) the cutoff value for discriminating low- and high-grade gliomas, and iii) the diagnostic performance for differentiating these tumors. METHODS: Following approval of institutional review board, informed consent was obtained from all patients. Thirty-five patients with primary glioma (grade II, 9; grade III, 8; and grade IV, 18 patients) were included...
September 20, 2016: Magnetic Resonance in Medical Sciences: MRMS
Chiharu Yoshimoto, Junko Takahama, Takuya Iwabuchi, Masato Uchikoshi, Hiroshi Shigetomi, Hiroshi Kobayashi
PURPOSE: Heme and iron accumulation due to repeated hemorrhage in endometriosis may contribute to a pivotal role in carcinogenesis. We evaluate the clinical application of MR relaxometry in a series of ovarian endometriosis (OE) and endometriosis-associated ovarian cancer (EAOC). MATERIALS AND METHODS: A prospective study of diagnostic accuracy was conducted among 82 patients (67 OE and 15 EAOC) to compare MR relaxometry and biochemical measurement of cyst fluid total iron concentration...
September 16, 2016: Magnetic Resonance in Medical Sciences: MRMS
Yusaku Moribata, Aki Kido, Koji Fujimoto, Yuki Himoto, Yasuhisa Kurata, Fuki Shitano, Kayo Kiguchi, Ikuo Konishi, Kaori Togashi
PURPOSE: To evaluate the feasibility of computed diffusion weighted imaging (DWI) in cervical cancer and investigate the optimal b-value using computed DWI. METHODS: The present retrospective study involved 85 patients with cervical cancer in the International Federation of Gynecology and Obstetrics (FIGO) stage IB, IIA or IIB. DWI was obtained with b-values of 0, 100, 500 and 1000 s/mm(2). Computed DWI with b-values of 800, 1000, 1300, 1600 and 2000 s/mm(2) (cDWI800, cDWI1000, cDWI1300, cDWI1600, cDWI2000) were generated from all measured DWI (mDWI) data...
September 16, 2016: Magnetic Resonance in Medical Sciences: MRMS
Koji Kamagata, Aurelien Kerever, Suguru Yokosawa, Yosuke Otake, Hisaaki Ochi, Masaaki Hori, Kouhei Kamiya, Kouhei Tsuruta, Kazuhiko Tagawa, Hitoshi Okazawa, Shigeki Aoki, Eri Arikawa-Hirasawa
No abstract text is available yet for this article.
October 11, 2016: Magnetic Resonance in Medical Sciences: MRMS
Nao Kodama, Katsumi Kose
Echo-planar imaging (EPI) sequences were developed for a 9.4 Tesla vertical standard bore (~54 mm) superconducting magnet using an unshielded gradient coil optimized for live mice imaging and a data correction technique with reference scans. Because EPI requires fast switching of intense magnetic field gradients, eddy currents were induced in the surrounding metallic materials, e.g., the room temperature bore, and this produced serious artifacts on the EPI images. We solved the problem using an unshielded gradient coil set of proper size (outer diameter = 39 mm, inner diameter = 32 mm) with time control of the current rise and reference scans...
October 11, 2016: Magnetic Resonance in Medical Sciences: MRMS
Takakiyo Nomura, Tetsu Niwa, Toshiki Kazama, Tatsuya Sekiguchi, Takashi Okazaki, Shuhei Shibukawa, Hiroaki Nishio, Makoto Obara, Yutaka Imai
We evaluated the visibility of the thoracic duct by fast balanced turbo field echo with extended k-space sampling (bTFEe). The thoracic duct of 10 healthy volunteers was scanned by bTFEe using a 1.5-T magnetic resonance imaging (MRI), which was acquired in approximately 2 minutes. Three-dimensional (3D) turbo spin-echo (TSE) was obtained for comparison. The thoracic duct including draining location of the venous system was overall well visualized on bTFEe, compared to TSE.
October 11, 2016: Magnetic Resonance in Medical Sciences: MRMS
Shinji Naganawa, Mai Kanou, Toshio Ohashi, Kayao Kuno, Michihiko Sone
PURPOSE: To evaluate the feasibility of a simple estimation for the endolymphatic volume ratio (endolymph volume/total lymph volume = %ELvolume) from an area ratio obtained from only one slice (%EL1slice) or from three slices (%EL3slices). The %ELvolume, calculated from a time-consuming measurement on all magnetic resonance (MR) slices, was compared to the %EL1slice and the %EL3slices. METHODS: In 40 ears of 20 patients with a clinical suspicion of endolymphatic hydrops, MR imaging was performed 4 hours after intravenous administration of a single dose of gadolinium-based contrast material (IV-SD-GBCM)...
October 11, 2016: Magnetic Resonance in Medical Sciences: MRMS
Tomoyuki Noguchi, Yusuke Yakushiji, Masashi Nishihara, Osamu Togao, Koji Yamashita, Kazufumi Kikuchi, Muneaki Matsuo, Shinya Azama, Hiroyuki Irie
PURPOSE: To investigate the characteristics of arterial spin-labeling magnetic resonance imaging (ASL-MRI) in central nervous system (CNS) infection. METHODS: Thirty-two patients with CNS infections underwent a pulsed ASL-MRI. The findings on ASL-MRI were retrospectively assessed for the pathogens as well as each of the following four pathology classified based on conventional MRI findings: non-purulent parenchymal involvement, meningeal involvement, abscess formation, and ventricular involvement...
October 11, 2016: Magnetic Resonance in Medical Sciences: MRMS
Sakiko Kageyama, Masafumi Kanoto, Yukio Sugai, Takeshi Suto, Satoru Nagase, Mitsumasa Osakabe, Takaaki Hosoya
Epithelioid trophoblastic tumor (ETT) is a rare gestational trophoblastic neoplasm of chorionic-type intermediate trophoblasts, and it is most frequently located in the lower uterine segment and endocervix. Due to the epithelial-growth pattern with geographic necrosis exhibited by the neoplastic cells, ETT is commonly confused, both clinically and pathologically, with squamous cell carcinoma. Although there have been no previous reports of ETT focusing on computed tomography (CT) or magnetic resonance imaging (MRI) findings, we report a case of uterine ETT with special attention to the MRI findings referring to the pathological findings and MR images of previous reports...
October 11, 2016: Magnetic Resonance in Medical Sciences: MRMS
Christina Andica, Akifumi Hagiwara, Misaki Nakazawa, Kouhei Tsuruta, Nao Takano, Masaaki Hori, Hiroharu Suzuki, Hidenori Sugano, Hajime Arai, Shigeki Aoki
No abstract text is available yet for this article.
October 11, 2016: Magnetic Resonance in Medical Sciences: MRMS
Young Han Lee, Seok Hahn, Eunju Kim, Jin-Suck Suh
PURPOSE: To compare short tau inversion recovery (STIR) images with slice encoding for metal artifact correction (SEMAC)-corrected magnetic resonance imaging (MRI) of spectral presaturation with inversion recovery (SPIR) or inversion recovery (IR) at 3T in patients with metallic spinal instrumentation. METHODS: Following institutional review board's approval, 71 vertebrae with interbody fixation in 26 patients who underwent transpedicular spondylodesis with spinal metallic prostheses were analyzed with SEMAC spinal MRI...
October 11, 2016: Magnetic Resonance in Medical Sciences: MRMS
Han Won Jang, Hui Joong Lee, Jongmin Lee, Chulho Won, Sung Won Youn, Mun Han, Yongmin Chang
BACKGROUND AND PURPOSE: The signal information per voxels of magnetic resonance imaging (MRI) for vessel wall could reflect the pathologic features of atherosclerotic vessels. The aim of this study is to evaluate the usefulness of magnetic resonance voxel-based histogram (VBH) of atherosclerotic basilar artery in patients with isolated pontine infarctions (PIs). MATERIALS AND METHODS: Wall and lumen of basilar artery were segmented from high resolution MR of 42 patients with isolated PI and 10 normal volunteers...
October 11, 2016: Magnetic Resonance in Medical Sciences: MRMS
Masami Goto, Makoto Suzuki, Shinya Mizukami, Osamu Abe, Shigeki Aoki, Tosiaki Miyati, Michinari Fukuda, Tsutomu Gomi, Tohoru Takeda
PURPOSE: An understanding of the repeatability of measured results is important for both the atlas-based and voxel-based morphometry (VBM) methods of magnetic resonance (MR) brain volumetry. However, many recent studies that have investigated the repeatability of brain volume measurements have been performed using static magnetic fields of 1-4 tesla, and no study has used a low-strength static magnetic field. The aim of this study was to investigate the repeatability of measured volumes using the atlas-based method and a low-strength static magnetic field (0...
October 11, 2016: Magnetic Resonance in Medical Sciences: MRMS
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