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Susceptibility Weighted Imaging

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https://www.readbyqxmd.com/read/29334139/interleaved-susceptibility-weighted-and-flair-mri-for-imaging-lesion-penetrating-veins-in-multiple-sclerosis
#1
Refaat E Gabr, Amol S Pednekar, Arash Kamali, John A Lincoln, Flavia M Nelson, Jerry S Wolinsky, Ponnada A Narayana
PURPOSE: To simultaneously image brain lesions and veins in multiple sclerosis. METHODS: An interleaved sequence was developed to simultaneously acquire 3-dimensional T2*-weighted (or susceptibility-weighted (SW)) and fluid-attenuated inversion recovery (FLAIR) images on a 3T MRI system. The pulse sequence parameters were calculated to minimize signal perturbation from steady state while maintaining acceptable image contrast and scan time. Fifteen multiple sclerosis patients were enrolled in this prospective study and underwent a standard multiple sclerosis imaging protocol...
January 15, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29330616/-magnetic-resonance-cisternography
#2
REVIEW
U Yilmaz
CLINICAL/METHODICAL ISSUE: Conventional MRI can be insufficient to depict certain pathologies of the cerebrospinal fluid (CSF)-filled spaces. STANDARD RADIOLOGICAL METHODS: 3-D T2-weighted sequences and phase-contrast imaging have a high sensitivity for pathologies of the CSF-filled spaces, but are susceptible to artifacts in some cases. METHODICAL INNOVATIONS/PERFORMANCE: Magnetic resonance (MR) cisternography directly depicts the connection between CSF-filled spaces...
January 12, 2018: Der Radiologe
https://www.readbyqxmd.com/read/29325780/longitudinal-atlas-for-normative-human-brain-development-and-aging-over-the-lifespan-using-quantitative-susceptibility-mapping
#3
Yuyao Zhang, Hongjiang Wei, Matthew J Cronin, Naying He, Fuhua Yan, Chunlei Liu
Longitudinal brain atlases play an important role in the study of human brain development and cognition. Existing atlases are mainly based on anatomical features derived from T1-and T2-weighted MRI. A 4D developmental quantitative susceptibility mapping (QSM) atlas may facilitate the estimation of age-related iron changes in deep gray matter nuclei and myelin changes in white matter. To this end, group-wise co-registered QSM templates were generated over various age intervals from age 1-83 years old. Registration was achieved by combining both T1-weighted and QSM images...
January 8, 2018: NeuroImage
https://www.readbyqxmd.com/read/29323247/leakage-correction-improves-prognosis-prediction-of-dynamic-susceptibility-contrast-perfusion-mri-in-primary-central-nervous-system-lymphoma
#4
Yeon Soo Kim, Seung Hong Choi, Roh-Eul Yoo, Koung Mi Kang, Tae Jin Yun, Ji-Hoon Kim, Chul-Ho Sohn, Sung-Hye Park, Jae-Kyung Won, Tae Min Kim, Chul-Kee Park, Il Han Kim
To evaluate whether the cerebral blood volume (CBV) measurement with leakage correction from dynamic susceptibility contrast perfusion weighted imaging can be useful in predicting prognosis for primary central nervous system lymphoma (PCNSL). 46 PCNSL patients were included and classified by radiation therapy (RT) stratification into RT (n = 30) and non-RT (n = 16) groups. The corresponding histogram parameters of normalized CBV (nCBV) maps with or without leakage correction were calculated on contrast-enhanced T1 weighted image (CE T1WI) or on fluid attenuated inversion recovery image...
January 11, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29320320/mr-imaging-and-cochlear-implants-with-retained-internal-magnets-reducing-artifacts-near-highly-inhomogeneous-magnetic-fields
#5
Heidi A Edmonson, Matthew L Carlson, Alice C Patton, Robert E Watson
The number of patients receiving cochlear implants and auditory brainstem implants for severe to profound sensorineural hearing loss has rapidly increased. These implants consist of an internal component implanted between the skull and the temporal scalp and an external removable speech processor unit. A small magnet within the internal component is commonly used to hold the external speech processor unit in place. Several cochlear implant models have recently received U.S. Food and Drug Administration and European Economic Area regulatory approval to allow magnetic resonance (MR) imaging examinations to be performed under certain specified conditions...
January 2018: Radiographics: a Review Publication of the Radiological Society of North America, Inc
https://www.readbyqxmd.com/read/29313473/1-5-tesla-magnetic-resonance-imaging-to-investigate-potential-etiologies-of-brain-swelling-in-pediatric-cerebral-malaria
#6
Michael J Potchen, Samuel D Kampondeni, Karl B Seydel, E Mark Haacke, Sylvester S Sinyangwe, Musaku Mwenechanya, Simon J Glover, Danny A Milner, Eric Zeli, Colleen A Hammond, David Utriainen, Kennedy Lishimpi, Terrie E Taylor, Gretchen L Birbeck
The hallmark of pediatric cerebral malaria (CM) is sequestration of parasitized red blood cells in the cerebral microvasculature. Malawi-based research using 0.35 Tesla (T) magnetic resonance imaging (MRI) established that severe brain swelling is associated with fatal CM, but swelling etiology remains unclear. Autopsy and clinical studies suggest several potential etiologies, but limitations of 0.35 T MRI precluded optimal investigations into swelling pathophysiology. A 1.5 T MRI in Zambia allowed for further investigations including susceptibility-weighted imaging (SWI)...
January 8, 2018: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/29299614/cortical-and-subcortical-morphometric-and-iron-changes-in-relapsing-remitting-multiple-sclerosis-and-their-association-with-white-matter-t2%C3%A2-lesion-load-a%C3%A2-3-tesla-magnetic-resonance-imaging-study
#7
Ali Al-Radaideh, Imad Athamneh, Hadeel Alabadi, Majed Hbahbih
INTRODUCTION: This study was carried out to investigate the global and regional morphometric and iron changes in grey matter (GM) of multiple sclerosis (MS) patients and link them to the white matter (WM) lesions in a multimodal magnetic resonance imaging approach. MATERIAL AND METHODS: The study involved 30 relapsing-remitting MS (RRMS) patients along with 30 age-matched healthy controls (HC) who were scanned on a 3T Siemens Trio system. The scanning protocol included a 3D, high resolution T1, T2, and T2*-weighted sequences...
January 3, 2018: Clinical Neuroradiology
https://www.readbyqxmd.com/read/29297155/brain-iron-deposition-in-type-2-diabetes-mellitus-with-and-without-mild-cognitive-impairment-an-in-vivo-susceptibility-mapping-study
#8
Qifang Yang, Lina Zhou, Chen Liu, Daihong Liu, Yang Zhang, Chang Li, Yongning Shang, Xin Wei, Chuanming Li, Jian Wang
This study was performed to investigate iron deposition in the brain of type 2 diabetes mellitus (T2DM) patients using quantitative susceptibility mapping (QSM) and the associated cognitive impairments. Sixty patients diagnosed with T2DM were subjected to neuropsychological tests to determine their cognitive status, and the results were used to subdivide the patients into a T2DM without mild cognitive impairment (MCI) group (n = 30) and a T2DM with MCI group (n = 30). All patients underwent high-resolution susceptibility-weighted imaging, and data processing was performed using SMART (Susceptibility Mapping and Phase Artifacts Removal Toolbox) software...
January 3, 2018: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/29289377/treatment-of-paraphilic-disorders-in-sexual-offenders-or-men-with-a-risk-of-sexual-offending-with-luteinizing-hormone-releasing-hormone-agonists-an-updated-systematic-review
#9
REVIEW
Daniel Turner, Peer Briken
BACKGROUND: Different pharmacologic agents are used in the treatment of paraphilic disorders in sexual offenders or men with a risk of sexual offending, with luteinizing hormone-releasing hormone (LHRH) agonists being the agents introduced more recently to treatment regimens. AIM: To summarize the relevant literature concerning LHRH agonist treatment of paraphilic disorders in sexual offenders and update the previously published systematic review by Briken et al (J Clin Psychiatry 2003;64:890-897)...
January 2018: Journal of Sexual Medicine
https://www.readbyqxmd.com/read/29285659/shoreline-change-and-potential-sea-level-rise-impacts-in-a-climate-hazardous-location-in-southeast-coast-of-india
#10
Marappan Jayanthi, Selvasekar Thirumurthy, Muthusamy Samynathan, Muthusamy Duraisamy, Moturi Muralidhar, Jangam Ashokkumar, Koyadan Kizhakkedath Vijayan
Climate change impact on the environment makes the coastal areas vulnerable and demands the evaluation of such susceptibility. Historical changes in the shoreline positions and inundation based on projected sea-level scenarios of 0.5 and 1 m were assessed for Nagapattinam District, a low-lying coastal area in the southeast coast of India, using high-resolution Shuttle Radar Topography Mission data; multi-dated Landsat satellite images of 1978, 1991, 2003, and 2015; and census data of 2011. Image processing, geographical information system, and digital shoreline analysis system methods were used in the study...
December 28, 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/29279191/mr-findings-in-the-substantia-nigra-on-phase-difference-enhanced-imaging-in-neurodegenerative-parkinsonism
#11
Atsuhiko Sugiyama, Noriko Sato, Yukio Kimura, Miho Ota, Tomoko Maekawa, Daichi Sone, Mikako Enokizono, Miho Murata, Hiroshi Matsuda, Satoshi Kuwabara
INTRODUCTION: In Parkinson's disease (PD) patients, magnetic resonance (MR) imaging studies using phase difference enhanced imaging (PADRE) and susceptibility-weighted imaging (SWI) showed the obscuration of the boundary between the crural fibers and substantia nigra, and the absence of dorsolateral nigral hyperintensity, respectively. PADRE images have not been evaluated in other types of neurodegenerative parkinsonism, and PADRE and SWI images have not been compared. Here we evaluated PADRE and SWI images in patients with progressive supranuclear palsy (PSP), multiple system atrophy (MSA), or PD and controls, and we compared the diagnostic values...
December 21, 2017: Parkinsonism & related Disorders
https://www.readbyqxmd.com/read/29279021/increased-myo-inositol-in-primary-motor-cortex-of-contact-sport-athletes-without-a-history-of-concussion
#12
Genevieve Lefebvre, Emilie Chamard, Sebastien Proulx, Sara Tremblay, Mark Halko, Salil Soman, Elaine de Guise, Alvaro Pascual-Leone, Hugo Theoret
OBJECTIVE: Determine whether repetitive hits to the head at a subclinical level are associated with structural and functional brain abnormalities and if these effects are influenced by high levels of fitness associated with intense physical activity. METHODS: Seventy-two college students were recruited: 24 non-athletes, 24 athletes practicing a varsity contact sport, and 24 athletes practicing a varsity non-contact sport. They were recruited for a neuropsychological evaluation and a magnetic resonance imaging session that included magnetic resonance spectroscopy of primary motor cortex (M1) and prefrontal cortex and susceptibility-weighted imaging...
December 26, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/29275598/-feasibility-of-susceptibility-weighted-imaging-in-the-evaluation-of-renal-fibrosis-induced-by-unilateral-ureteral-obstruction-in-white-rabbits
#13
J G Zhang, Z Y Xing, T T Zha, X J Tian, S J Xing, X Pan, L Xu, L Pan, W Xing, J Chen
Objective: To evaluate the feasibility of susceptibility weighted imaging (SWI) to reflect the progression of renal fibrosis (RF) induced by unilateral ureteral obstruction (UUO) in rabbits. Methods: Total of 32 New Zealand white rabbits (aged 4-5 months) were used to establish the UUO model (RF group) and were divided into 4 subgroups (including RF-2W group, RF-4W group , RF-6W group and RF-8W group) according to the duration of obstruction(2, 4, 6 and 8 weeks). Another 8 rabbits, underwent sham operation, were used as the control group (Sham group)...
December 5, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/29275590/-parkinson-s-disease-diffusion-kurtosis-imaging-and-the-correlation-with-clinical-manifestations
#14
Y Q Sun, Q Zhang, Z Jiang, C Y Zhang, J W Zhang, H Chen, J K Shen
Objective: Using magnetic resonance diffusion kurtosis imaging (DKI) to evaluate the microstructure changes of deep brain nucleus in Parkinson's disease (PD) as well as the correlation with clinical manifestations. Methods: Thirty-two PD patients were recruited into this study. Twenty gender and age matched healthy subjects served as the control group. All participants underwent MRI examinations, including T(1)WI, T(2)WI, DWI, susceptibility weighted imaging (SWI) and DKI. The original DKI imaging data were processed offline to calculate two parametric maps, including mean kurtosis (MK) value and fractional anisotropy (FA) value...
December 5, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/29275518/borders-of-stn-determined-by-mri-versus-the-electrophysiological-stn-a-comparison-using-intraoperative-ct
#15
Sander Bus, Pepijn van den Munckhof, Maarten Bot, Gian Pal, Bichun Ouyang, Sepehr Sani, Leo Verhagen Metman
BACKGROUND: It is unclear which magnetic resonance imaging (MRI) sequence most accurately corresponds with the electrophysiological subthalamic nucleus (STN) obtained during microelectrode recording (MER, MER-STN). CT/MRI fusion allows for comparison between MER-STN and the STN visualized on preoperative MRI (MRI-STN). OBJECTIVE: To compare dorsal and ventral STN borders as seen on 3-Tesla T2-weighted (T2) and susceptibility weighted images (SWI) with electrophysiological STN borders in deep brain stimulation (DBS) for Parkinson's disease (PD)...
December 23, 2017: Acta Neurochirurgica
https://www.readbyqxmd.com/read/29261786/resume-turning-an-swi-acquisition-into-a-fast-qmri-protocol
#16
Serena Monti, Pasquale Borrelli, Enrico Tedeschi, Sirio Cocozza, Giuseppe Palma
Susceptibility Weighted Imaging (SWI) is a common MRI technique that exploits the magnetic susceptibility differences between the tissues to provide valuable image contrasts, both in research and clinical contexts. However, despite its increased clinical use, SWI is not intrinsically suitable for quantitation purposes. Conversely, quantitative Magnetic Resonance Imaging (qMRI) provides a way to disentangle the sources of common MR image contrasts (e.g. proton density, T1, etc.) and to measure physical parameters intrinsically related to tissue microstructure...
2017: PloS One
https://www.readbyqxmd.com/read/29260364/evaluation-of-vertebral-body-fractures-using-susceptibility-weighted-magnetic-resonance-imaging
#17
Sarah M Böker, Lisa C Adams, Yvonne Y Bender, Moritz Wagner, Torsten Diekhoff, Eva Fallenberg, Bernd Hamm, Marcus R Makowski
PURPOSE: To test the diagnostic performance of susceptibility-weighted MRI (sMRI) for the evaluation of vertebral body fractures versus standard MRI-sequences, using CT as reference standard. METHODS: In this prospective study 88 vertebral fractures (45 healed, 43 non-healed) were detected in 39 patients who underwent T1/T2/TIRM MRI-sequences and sMRI. All fractures were evaluated with CT as reference standard. In all modalities/sequences, displacement and height of the posterior vertebral body cortex and visibility of fracture lines and cortical breaks were assessed...
December 19, 2017: European Radiology
https://www.readbyqxmd.com/read/29249064/reduced-deep-regional-cerebral-venous-oxygen-saturation-in-hemodialysis-patients-using-quantitative-susceptibility-mapping
#18
Chao Chai, Saifeng Liu, Linlin Fan, Lei Liu, Jinping Li, Chao Zuo, Tianyi Qian, E Mark Haacke, Wen Shen, Shuang Xia
Cerebral venous oxygen saturation (SvO2) is an important indicator of brain function. There was debate about lower cerebral oxygen metabolism in hemodialysis patients and there were no reports about the changes of deep regional cerebral SvO2 in hemodialysis patients. In this study, we aim to explore the deep regional cerebral SvO2 from straight sinus using quantitative susceptibility mapping (QSM) and the correlation with clinical risk factors and neuropsychiatric testing. 52 hemodialysis patients and 54 age-and gender-matched healthy controls were enrolled...
December 16, 2017: Metabolic Brain Disease
https://www.readbyqxmd.com/read/29247352/imaging-putative-foetal-cerebral-blood-oxygenation-using-susceptibility-weighted-imaging-swi
#19
Brijesh Kumar Yadav, Uday Krishnamurthy, Sagar Buch, Pavan Jella, Edgar Hernandez-Andrade, Lami Yeo, Steven J Korzeniewski, Anabela Trifan, Sonia S Hassan, E Mark Haacke, Roberto Romero, Jaladhar Neelavalli
OBJECTIVE: To evaluate the magnetic susceptibility, ∆χ v , as a surrogate marker of venous blood oxygen saturation, S v O 2, in second- and third-trimester normal human foetuses. METHODS: Thirty-six pregnant women, having a mean gestational age (GA) of 31 2/7 weeks, underwent magnetic resonance imaging (MRI). Susceptibility-weighted imaging (SWI) data from the foetal brain were acquired. ∆χ v of the superior sagittal sinus (SSS) was quantified using MR susceptometry from the intra-vascular phase measurements...
December 15, 2017: European Radiology
https://www.readbyqxmd.com/read/29247084/protocol-of-a-single-group-prospective-observational-study-on-the-diagnostic-value-of-3t-susceptibility-weighted-mri-of-nigrosome-1-in-patients-with-parkinsonian-symptoms-the-n3ipd-study-nigrosomal-iron-imaging-in-parkinson-s-disease
#20
Stefan T Schwarz, Yue Xing, Saadnah Naidu, Jim Birchall, Rob Skelly, Alan Perkins, Jonathan Evans, Gill Sare, Antonio Martin-Bastida, Nin Bajaj, Penny Gowland, Paola Piccini, Dorothee P Auer
INTRODUCTION: Parkinson's disease (PD) is the most common movement disorder in the elderly and is characterised clinically by bradykinesia, tremor and rigidity. Diagnosing Parkinson's can be difficult especially in the early stages. High-resolution nigrosome MRI offers promising diagnostic accuracy of patients with established clinical symptoms; however, it is unclear whether this may help to establish the diagnosis in the early stages of PD, when there is diagnostic uncertainty. In this scenario, a single photon emission CT scan using a radioactive dopamine transporter ligand can help to establish the diagnosis, or clinical follow-up may eventually clarify the diagnosis...
December 14, 2017: BMJ Open
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