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Natsumeda M, Matsuzawa H, Watanabe M, Motohashi K, Gabdulkhaev R, Tsukamoto Y, Kanemaru Y, Watanabe J, Ogura R, Okada M, Kurabe S, Okamoto K, Kakita A, Igarashi H, Fujii Y. SWI by 7T MR Imaging for the Microscopic Imaging Diagnosis of Astrocytic and Oligodendroglial Tumors. AJNR Am J Neuroradiol 2022; 43:1575-1581. [PMID: 36229164 PMCID: PMC9731250 DOI: 10.3174/ajnr.a7666] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2021] [Accepted: 08/21/2022] [Indexed: 02/01/2023]
Abstract
BACKGROUND AND PURPOSE Despite advances in molecular imaging, preoperative diagnosis of astrocytomas and oligodendrogliomas can be challenging. In the present study, we assessed whether 7T SWI can be used to distinguish astrocytomas and oligodendrogliomas and whether malignant grading of gliomas is possible. MATERIALS AND METHODS 7T SWI was performed on 21 patients with gliomas before surgery with optimization for sharp visualization of the corticomedullary junction. Scoring for cortical thickening and displacement of medullary vessels, characteristic of oligodendroglial tumors, and cortical tapering, characteristic of astrocytic tumors, was performed. Additionally, characteristics of malignancy, including thickening of the medullary veins, the presence of microbleeds, and/or necrosis were scored. RESULTS Scoring for oligodendroglial (highest possible score, +3) and astrocytic (lowest score possible, -3) characteristics yielded a significant difference between astrocytomas and oligodendrogliomas (mean, -1.93 versus +1.71, P < .01). Scoring for malignancy was significantly different among the World Health Organization grade II (n = 10), grade III (n = 4), and grade IV (n = 7) tumors (mean, 0.20 versus 1.38 versus 2.79). Cortical thickening was observed significantly more frequently in oligodendrogliomas (P < .02), with a sensitivity of 71.4% and specificity of 85.7%; observation of tapering of the cortex was higher in astrocytomas (P < .01) with a sensitivity of 85.7% and specificity of 100%. CONCLUSIONS Visualization of the corticomedullary junction by 7T SWI was useful in distinguishing astrocytomas and oligodendrogliomas. Observation of tapering of the cortex was most sensitive and specific for diagnosing astrocytomas. Reliably predicting malignant grade was also possible by 7T SWI.
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Affiliation(s)
- M Natsumeda
- From the Department of Neurosurgery (M.N., K.M., Y.T., Y.K., J.W., R.O., M.O., S.K., Y.F.)
| | - H Matsuzawa
- Center for Integrated Human Brain Science (H.M., M.W., H.I.)
| | - M Watanabe
- Center for Integrated Human Brain Science (H.M., M.W., H.I.)
| | - K Motohashi
- From the Department of Neurosurgery (M.N., K.M., Y.T., Y.K., J.W., R.O., M.O., S.K., Y.F.)
| | | | - Y Tsukamoto
- From the Department of Neurosurgery (M.N., K.M., Y.T., Y.K., J.W., R.O., M.O., S.K., Y.F.)
| | - Y Kanemaru
- From the Department of Neurosurgery (M.N., K.M., Y.T., Y.K., J.W., R.O., M.O., S.K., Y.F.)
| | - J Watanabe
- From the Department of Neurosurgery (M.N., K.M., Y.T., Y.K., J.W., R.O., M.O., S.K., Y.F.)
| | - R Ogura
- From the Department of Neurosurgery (M.N., K.M., Y.T., Y.K., J.W., R.O., M.O., S.K., Y.F.)
| | - M Okada
- From the Department of Neurosurgery (M.N., K.M., Y.T., Y.K., J.W., R.O., M.O., S.K., Y.F.)
| | - S Kurabe
- From the Department of Neurosurgery (M.N., K.M., Y.T., Y.K., J.W., R.O., M.O., S.K., Y.F.)
| | - K Okamoto
- Department of Translational Research (K.O.), Brain Research Institute, Niigata University, Niigata, Japan
| | - A Kakita
- Department of Pathology (R.G., A.K.)
| | - H Igarashi
- Center for Integrated Human Brain Science (H.M., M.W., H.I.)
| | - Y Fujii
- From the Department of Neurosurgery (M.N., K.M., Y.T., Y.K., J.W., R.O., M.O., S.K., Y.F.)
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Yamada K, Yoshimura J, Watanabe M, Suzuki K. Application of 7 tesla magnetic resonance imaging for pediatric neurological disorders: Early clinical experience. J Clin Imaging Sci 2022; 11:65. [PMID: 34992941 PMCID: PMC8720429 DOI: 10.25259/jcis_185_2021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Accepted: 11/07/2021] [Indexed: 11/04/2022] Open
Abstract
Ultra-high field magnetic resonance imaging (MRI) has been introduced for use in pediatric developmental neurology. While higher magnetic fields have certain advantages, optimized techniques with specific considerations are required to ensure rational and safe use in children and those with pediatric neurological disorders (PNDs). Here, we summarize our initial experience with clinical translational studies that utilized 7 tesla (T)-MRI in the fields of developmental neurology. T2-reversed images and three-dimensional anisotropy contrast imaging enabled the depiction of targeted pathological brain structures with better spatial resolution. Diffusion imaging and susceptibility-weighted imaging enabled visualization of intracortical, subcortical, and intratumoral microstructures in vivo within highly limited scan times appropriate for patients with PNDs. 7T-MRI appears to have significant potential to enhance the depiction of the structural and functional properties of the brain, particularly those associated with atypical brain development.
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Affiliation(s)
- Kenichi Yamada
- Center for Integrated Human Brain Science, Brain Research Institute, Niigata University, Niigata, Japan
| | - Junichi Yoshimura
- Department of Neurosurgery, Brain Research Institute, Niigata University, Niigata, Japan
| | - Masaki Watanabe
- Center for Integrated Human Brain Science, Brain Research Institute, Niigata University, Niigata, Japan
| | - Kiyotaka Suzuki
- Center for Integrated Human Brain Science, Brain Research Institute, Niigata University, Niigata, Japan
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Mehemed TM, Yamamoto A, Okada T, Kanagaki M, Sawada T, Morimoto E, Takahashi JC, Miyamoto S, Togashi K. Analysis of susceptibility-weighted images of cortico-medullary junction. Magn Reson Med Sci 2014; 13:231-8. [PMID: 25167876 DOI: 10.2463/mrms.2013-0108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
OBJECTIVE We qualitatively evaluated the differences among susceptibility-weighted (SWI), magnitude (MAG), and high pass filtered phase (PHA) images in depicting interlobar differences in the appearance of the signal of the corticomedullary junction (CMJ). We conducted quantitative evaluation to validate the qualitative results. MATERIALS AND METHODS We obtained SWI images from 25 preoperative brain tumor patients (12 men, 13 women, aged 19 to 82 years, mean, 52 years). Two trained neuroradiologists evaluated MAG, PHA, and SWI images. Qualitative evaluation of the CMJ signal and quantitative calculation of the relative signal ratio (RSR) percentages between the CMJ and deep white matter (WM) were conducted at 3 different slice levels of the brain independently for 4 different lobes (frontal, parietal, temporal, and occipital) and compared among MAG, PHA, and SWI. The extent of the area of the CMJ signal was graded on a 4-point scale (Grade 3, >75%; Grade 2, 50 to 75%; Grade 1, 25 to 50%; Grade 0, <25%). Data were statistically analyzed using a nonparametric Friedman test. RESULTS The Kappa coefficients between the qualitative and quantitative grades were 0.002 for MAG, 0.0047 for PHA, and 0.050 for SWI. Qualitatively, on the PHA images and SWI, grades of the occipital lobes were significantly higher than those of the other lobes (P < 0.005). Quantitatively, PHA images showed statistically significant interlobar differences in RSR percentage values of the CMJ (P = 0.025). CONCLUSION Qualitatively, the appearance of the CMJ differed significantly among the different lobes of the brain on SWI and underlying PHA images but not on MAG images. Quantitatively, only PHA images showed significant interlobar differences in the RSR. PHA images are most sensitive to the CMJ signal contrast due to local paramagnetic iron content.
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Affiliation(s)
- Taha M Mehemed
- Department of Diagnostic Imaging and Nuclear Medicine, Graduate School of Medicine, Kyoto University
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7T T₂*-weighted magnetic resonance imaging reveals cortical phase differences between early- and late-onset Alzheimer's disease. Neurobiol Aging 2014; 36:20-6. [PMID: 25113794 DOI: 10.1016/j.neurobiolaging.2014.07.006] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2014] [Revised: 06/25/2014] [Accepted: 07/08/2014] [Indexed: 11/22/2022]
Abstract
The aim of this study is to explore regional iron-related differences in the cerebral cortex, indicative of Alzheimer's disease pathology, between early- and late-onset Alzheimer's disease (EOAD, LOAD, respectively) patients using 7T magnetic resonance phase images. High-resolution T2(∗)-weighted scans were acquired in 12 EOAD patients and 17 LOAD patients with mild to moderate disease and 27 healthy elderly control subjects. Lobar peak-to-peak phase shifts and regional mean phase contrasts were computed. An increased peak-to-peak phase shift was found for all lobar regions in EOAD patients compared with LOAD patients (p < 0.05). Regional mean phase contrast in EOAD patients was higher than in LOAD patients in the superior medial and middle frontal gyrus, anterior and middle cingulate gyrus, postcentral gyrus, superior and inferior parietal gyrus, and precuneus (p ≤ 0.042). These data suggest that EOAD patients have an increased iron accumulation, possibly related to an increased amyloid deposition, in specific cortical regions as compared with LOAD patients.
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