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https://www.readbyqxmd.com/read/29473304/non-enhanced-magnetic-resonance-imaging-versus-renal-scintigraphy-in-acute-pyelonephritis
#1
Jun Aoyagi, Takahiro Kanai, Jun Odaka, Takane Ito, Takashi Saito, Hiroyuki Betsui, Rieko Furukawa, Waka Nakata, Takanori Yamagata
The utility of non-enhanced magnetic resonance imaging (MRI) has not been examined extensively for diagnosing acute pyelonephritis (APN) in children. The aims of this study were to compare non-enhanced MRI with technetium-99 m dimercaptosuccinic acid (99m Tc-DMSA) renal scintigraphy in detecting APN. Six boys and one girl with temperature ≥38°C and positive urine culture received both non-enhanced MRI with whole body diffusion-weighted imaging (DWI) and99m Tc-DMSA scintigraphy ≤7 days from the fever onset...
February 2018: Pediatrics International: Official Journal of the Japan Pediatric Society
https://www.readbyqxmd.com/read/29471670/utility-of-intravoxel-incoherent-motion-magnetic-resonance-imaging-and-arterial-spin-labeling-for-recurrent-glioma-after-bevacizumab-treatment
#2
Fuminori Miyoshi, Yuki Shinohara, Atsushi Kambe, Keita Kuya, Atsushi Murakami, Masamichi Kurosaki, Toshihide Ogawa
Background Detecting recurrence of glioma on magnetic resonance imaging (MRI) is getting more and more important, especially after administration of new anti-tumor agent. However, it is still hard to identify. Purpose To examine the utility of intravoxel incoherent motion (IVIM) MRI and arterial spin labeling-cerebral blood flow (ASL-CBF) for recurrent glioma after initiation of bevacizumab (BEV) treatment. Material and Methods Thirteen patients (7 men, 6 women; age range = 41-82 years) with glioma (high grade, n = 11; low grade, n = 2) were enrolled in the study...
January 1, 2018: Acta Radiologica
https://www.readbyqxmd.com/read/29470156/journal-club-evaluation-of-diffusion-kurtosis-imaging-of-stroke-lesion-with-hemodynamic-and-metabolic-mri-in-a-rodent-model-of-acute-stroke
#3
Dongshuang Lu, Yinghua Jiang, Yang Ji, Iris Yuwen Zhou, Emiri Mandeville, Eng H Lo, Xiaoying Wang, Phillip Zhe Sun
OBJECTIVE: Diffusion kurtosis imaging (DKI) has emerged as a new acute stroke imaging approach, augmenting routine DWI. Although it has been shown that a diffusion lesion without kurtosis abnormality is more likely to recover after reperfusion, whereas a kurtosis lesion shows poor response, little is known about the underlying pathophysiologic profile of the kurtosis lesion versus the kurtosis lesion-diffusion lesion mismatch. MATERIALS AND METHODS: We performed multiparametric MRI, including arterial spin labeling, pH-sensitive amide proton transfer, and DKI, in a rodent model of acute stroke caused by embolic middle cerebral artery occlusion...
February 22, 2018: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/29467370/the-impact-of-computed-high-b-value-images-on-the-diagnostic-accuracy-of-dwi-for-prostate-cancer-a-receiver-operating-characteristics-analysis
#4
Peigang Ning, Dapeng Shi, Geoffrey A Sonn, Shreyas S Vasanawala, Andreas M Loening, Pejman Ghanouni, Piotr Obara, Lewis K Shin, Richard E Fan, Brian A Hargreaves, Bruce L Daniel
To evaluate the performance of computed high b value diffusion-weighted images (DWI) in prostate cancer detection. 97 consecutive patients who had undergone multiparametric MRI of the prostate followed by biopsy were reviewed. Five radiologists independently scored 138 lesions on native high b-value images (b = 1200 s/mm2 ), apparent diffusion coefficient (ADC) maps, and computed high b-value images (contrast equivalent to b = 2000 s/mm2 ) to compare their diagnostic accuracy. Receiver operating characteristic (ROC) analysis and McNemar's test were performed to assess the relative performance of computed high b value DWI, native high b-value DWI and ADC maps...
February 21, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29467012/structural-and-advanced-imaging-in-predicting-mgmt-promoter-methylation-of-primary-glioblastoma-a-region-of-interest-based-analysis
#5
Yu Han, Lin-Feng Yan, Xi-Bin Wang, Ying-Zhi Sun, Xin Zhang, Zhi-Cheng Liu, Hai-Yan Nan, Yu-Chuan Hu, Yang Yang, Jin Zhang, Ying Yu, Qian Sun, Qiang Tian, Bo Hu, Gang Xiao, Wen Wang, Guang-Bin Cui
BACKGROUND: The methylation status of oxygen 6-methylguanine-DNA methyltransferase (MGMT) promoter has been associated with treatment response in glioblastoma(GBM). Using pre-operative MRI techniques to predict MGMT promoter methylation status remains inconclusive. In this study, we investigated the value of features from structural and advanced imagings in predicting the methylation of MGMT promoter in primary glioblastoma patients. METHODS: Ninety-two pathologically confirmed primary glioblastoma patients underwent preoperative structural MR imagings and the efficacy of structural image features were qualitatively analyzed using Fisher's exact test...
February 21, 2018: BMC Cancer
https://www.readbyqxmd.com/read/29460044/mri-features-of-primary-hepatic-lymphoma
#6
Stefano Colagrande, Linda Calistri, Giulia Grazzini, Cosimo Nardi, Simone Busoni, Giovanni Morana, Luigi Grazioli
PURPOSE: Our retrospective study sought to describe the spectrum of magnetic resonance imaging (MRI) features of primary hepatic lymphoma (PHL) by analyzing its morphological aspects, signal intensity before and after contrast agent (CA) administration, and diffusion-weighted imaging (DwI) with the apparent diffusion coefficient (ADC) values. METHODS: A retrospective analysis was conducted on 25 patients with pathologically proven PHL who underwent MRI between January 2011 and December 2016...
February 19, 2018: Abdominal Radiology
https://www.readbyqxmd.com/read/29458901/characterization-of-tubo-ovarian-abscess-mimicking-adnexal-masses-comparison-between-contrast-enhanced-ct-18-f-fdg-pet-ct-and-mri
#7
Hua Fan, Ting-Ting Wang, Gang Ren, Hong-Liang Fu, Xiang-Ru Wu, Cai-Ting Chu, Wen-Hua Li
0BJECTIVE: We compared the diagnostic accuracy of contrast-enhanced computed tomography (CT), fluorine 18-labeled-fludeoxyglucose (18 F-FDG) positron emission tomography (PET)/CT and conventional magnetic resonance imaging (MRI) without and with diffusion-weighted imaging (DWI) for characterization of tubo-ovarian abscesses (TOAs) that mimic adnexal tumors. MATERIALS AND METHODS: We evaluated (retrospectively) 43 patients who underwent contrast-enhanced CT, PET/CT, conventional MRI without and with DWI, and who were found to have TOAs and complex adnexal tumors...
February 2018: Taiwanese Journal of Obstetrics & Gynecology
https://www.readbyqxmd.com/read/29449517/-a-case-of-moyamoya-disease-with-postoperative-cerebral-hyperperfusion-syndrome-followed-by-cerebral-infarction-due-to-watershed-shift
#8
Kimitoshi Sato, Shun Tsudaka, Takanori Miki, Norikata Kobayashi, Taro Yamashita, Kiyoharu Imataka, Takashi Yoshida, Fuminori Shimizu
The concept of "watershed shift"(WS)has been proposed as a cause of the ischemic complications following a superficial temporal artery-middle cerebral artery(STA-MCA)bypass operation performed for the management of moyamoya disease. Previous reports have observed that only 1.2-5.7% of the patients who underwent a bypass operation for the management of moyamoya disease developed cerebral infarction secondary to the WS phenomenon. To date, the WS phenomenon has not been objectively proven on imaging studies...
February 2018: No Shinkei Geka. Neurological Surgery
https://www.readbyqxmd.com/read/29449501/diffusion-weighted-imaging-is-a-sensitive-and-specific-magnetic-resonance-sequence-in-the-diagnosis-of-ankylosing-spondylitis
#9
Linda A Bradbury, Kelly A Hollis, Benoît Gautier, Sateesh Shankaranarayana, Philip C Robinson, Nivene Saad, Kim-Anh Lê Cao, Matthew A Brown
OBJECTIVE: We tested the discriminatory capacity of diffusion-weighted magnetic resonance imaging (DWI) and its potential as an objective measure of treatment response to tumor necrosis factor inhibition in ankylosing spondylitis (AS). METHODS: Three cohorts were studied prospectively: (1) 18 AS patients with Bath Ankylosing Spondylitis Disease Activity Index > 4, and erythrocyte sedimentation rate > 25 and/or C-reactive protein > 10 meeting the modified New York criteria for AS; (2) 20 cases of nonradiographic axial spondyloarthritis (nr-axSpA) as defined by the Assessment of Spondyloarthritis international Society (ASAS) criteria; and (3) 20 non-AS patients with chronic low back pain, aged between 18 and 45 years, who did not meet the imaging arm of the ASAS criteria for axSpA...
February 15, 2018: Journal of Rheumatology
https://www.readbyqxmd.com/read/29449279/mri-with-dwi-for-the-detection-of-posttreatment-head-and-neck-squamous-cell-carcinoma-why-morphologic-mri-criteria-matter
#10
A Ailianou, P Mundada, T De Perrot, M Pusztaszieri, P-A Poletti, M Becker
BACKGROUND AND PURPOSE: Although diffusion-weighted imaging combined with morphologic MRI (DWIMRI) is used to detect posttreatment recurrent and second primary head and neck squamous cell carcinoma, the diagnostic criteria used so far have not been clarified. We hypothesized that precise MRI criteria based on signal intensity patterns on T2 and contrast-enhanced T1 complement DWI and therefore improve the diagnostic performance of DWIMRI. MATERIALS AND METHODS: We analyzed 1...
February 15, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29446674/intravoxel-incoherent-motion-mri-of-rectal-cancer-correlation-of-diffusion-and-perfusion-characteristics-with-prognostic-tumor-markers
#11
Hongliang Sun, Yanyan Xu, Aiping Song, Kaining Shi, Wu Wang
OBJECTIVE: The objective of our study was to evaluate the intravoxel incoherent motion (IVIM)-DWI derived parameters and their relationships with tumor prognostic markers using 3-T MRI in patients with rectal cancer. SUBJECTS AND METHODS: Fifty-two patients with histopathologically proven rectal cancer who underwent preoperative pelvic MRI were prospectively enrolled in this study. Diffusion and perfusion parameters including the apparent diffusion coefficient (ADC), pure diffusion coefficient, perfusion fraction, and pseudodiffusion coefficient derived from IVIMDWI were independently measured by two radiologists...
February 15, 2018: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/29446510/use-of-t-1-relaxation-time-in-rotating-frame-t-1-%C3%AF-and-apparent-diffusion-coefficient-to-estimate-cerebral-stroke-evolution
#12
Yuefa Tan, Jun Xu, Ruiying Chen, Bin Chen, Juan Xu, Daokun Ren, Queenie Chan, Yingjie Mei, Yuankui Wu, Yikai Xu
BACKGROUND: The major factor for the appropriate treatment strategies for ischemia patients is its onset timing. PURPOSE/HYPOTHESIS: To study to evaluate the diagnostic accuracy of T 1 relaxation time in a rotating frame (T 1 ρ) and apparent diffusion coefficient (ADC) from MRI to estimate ischemia stages. STUDY TYPE: Prospective. POPULATION/SUBJECTS/PHANTOM/SPECIMEN/ANIMAL MODEL: In all, 73 patients (49 males, aged 29-78 years and 24 females, aged 22-94 years) with ischemia were prospectively imaged with T 1 ρ and diffusion MRI during the postischemic period...
February 15, 2018: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29442234/microstructural-changes-in-patients-with-parkinson-disease-and-rem-sleep-behavior-disorder-depressive-symptoms-versus-non-depressed
#13
Farzaneh Ghazi Sherbaf, Farzaneh Rahmani, Sommayeh Mohammadi Jooyandeh, Mohammad Hadi Aarabi
Search for Parkinson's disease (PD) progression biomarkers has led to the identification of both motor and non-motor symptoms relevant of prodromal PD that could be eye-opening to the spreading underlying Lewy body pathogenesis. One most robust predictor of PD is the REM sleep behavior disorder (RBD), and one most common early non-motor symptom of PD is depression. With RBD, frequently coexisting with clinical depression and both predicting dopamine transmission dysfunction, we aimed to survey structural associates of depressive symptoms in early PD patients with comorbid RBD...
February 13, 2018: Acta Neurologica Belgica
https://www.readbyqxmd.com/read/29440724/magnetic-resonance-temporal-diffusion-tensor-spectroscopy-of-disordered-anisotropic-tissue
#14
Jonathan Scharff Nielsen, Tim B Dyrby, Henrik Lundell
Molecular diffusion measured with diffusion weighted MRI (DWI) offers a probe for tissue microstructure. However, inferring microstructural properties from conventional DWI data is a complex inverse problem and has to account for heterogeneity in sizes, shapes and orientations of the tissue compartments contained within an imaging voxel. Alternative experimental means for disentangling the signal signatures of such features could provide a stronger link between the data and its interpretation. Double diffusion encoding (DDE) offers the possibility to factor out variation in compartment shapes from orientational dispersion of anisotropic domains by measuring the correlation between diffusivity in multiple directions...
February 13, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29436842/diffusion-weighted-mri-in-myositis-the-value-of-adc-histogram-analysis
#15
Hans Jonas Meyer, Alexander Emmer, Malte Kornhuber, Alexey Surov
OBJECTIVE: Diffusion weighted imaging (DWI) has the potential of being able to reflect histopathology architecture. A novel imaging approach, namely histogram analysis, is used to further characterize tissues on MRI. The aim of this study was to correlate histogram parameters derived from ADC maps with serological parameters in myositis. METHODS: 16 patients with autoimmune myositis were included in this retrospective study. DWI was obtained on a 1.5T scanner by using the b values of 0 and 1000 s/mm2...
February 13, 2018: British Journal of Radiology
https://www.readbyqxmd.com/read/29435027/dynamics-of-angiogenesis-and-cellularity-in-rabbit-vx2-tumors-using-contrast-enhanced-magnetic-resonance-imaging-and-diffusion-weighted-imaging
#16
Haixia Li, Lijuan Yu, Wenzhi Wang, Lingling Wang, Xiulan Zheng, Shaochun Dai, Yanqin Sun
A number of studies have demonstrated that dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) may be used to evaluate microvessel density (MVD), and may quantitatively reflect tumor angiogenesis. To investigate the dynamics, including angiogenesis and tumor cellularity, of rabbit VX2 tumors during the 4 weeks following tumor implantation, the present study used DCE-MRI combined with diffusion-weighted imaging (DWI) to scan the tumors at 3 days, and then at 1, 2, 3 and 4-week intervals, following tumor implantation...
March 2018: Oncology Letters
https://www.readbyqxmd.com/read/29434092/water-diffusion-in-the-brain-of-chronic-hypoperfusion-model-mice-a-study-considering-the-effect-of-blood-flow
#17
Takuya Urushihata, Hiroyuki Takuwa, Chie Seki, Yasuhiko Tachibana, Manami Takahashi, Jeff Kershaw, Yuhei Takado, Ichio Aoki, Makoto Higuchi, Hiroshi Ito, Takayuki Obata
PURPOSE: Chronic cerebral hypoperfusion model mice were created by unilateral common carotid artery occlusion (UCCAO) surgery, which does not cause cerebral infarction, but which does cause long-term reduction in cerebral blood flow (CBF) to the occluded side. Cognitive dysfunction in this mouse model has been demonstrated in behavioral experiments, but neuron density change was not found in a previous positron emission tomography (PET) study. As a next step, in this study we investigated the injury of neuronal fibers in chronic cerebral hypoperfusion model mice using diffusion tensor imaging (DTI)...
February 13, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29432946/postoperative-cerebral-infarction-risk-factors-and-postoperative-management-of-pediatric-moyamoya-disease-patients
#18
Shinsuke Muraoka, Yoshio Araki, Goro Kondo, Michihiro Kurimoto, Yoshiki Shiba, Kenji Uda, Shinji Ota, Sho Okamoto, Toshihiko Wakabayashi
OBJECT: Though revascularization surgery for moyamoya disease patients can effectively prevent ischemic events and thus improve the long-term clinical outcome, the incidence of postoperative ischemic complications affects patients' quality of life. This study aimed to clarify the risk factors associated with postoperative ischemic complications and to discuss the appropriate perioperative management. METHODS: Fifty-eight revascularization operations were performed in 37 children with moyamoya disease...
February 9, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29431878/characteristics-associated-with-outcome-in-first-ever-posterior-fossa-stroke-patients
#19
Kersten Villringer, Malgorzata Florczak-Rzepka, Ulrike Grittner, Peter Brunecker, Hans Tepe, Christian H Nolte, Jochen B Fiebach
BACKGROUND: Factors like infarct volume, infarct location and symptom severity can considerably influence long-term outcome in posterior fossa strokes. Therapy decision can sometimes be complicated by discrepancies between infarct volume and clinical severity. We aimed to evaluate imaging and clinical parameters possibly influencing long-term outcome in first-ever posterior fossa stroke patients. METHODS: Imaging was performed on a 3 T MRI scanner. Sixty-one out of 1795 patients from the observational 1000Plus and LOBI studies (clinicaltrials...
February 12, 2018: European Journal of Neurology: the Official Journal of the European Federation of Neurological Societies
https://www.readbyqxmd.com/read/29431555/current-concepts-in-tumor-imaging-with-whole-body-mri-with-diffusion-imaging-wb-mri-dwi-in-multiple-myeloma-and-lymphoma
#20
Alessandro Stecco, Francesco Buemi, Antoine Iannessi, Alessandro Carriero, Andrea Gallamini
Whole-body MRI (WB-MRI) with diffusion-weighted imaging (DWI) can now be used to stage and restage multiple myeloma (MM) and lymphoma. Magnetic resonance imaging (MRI) is the standard tool to detect BM involvement (BMI). The 2016 diagnostic criteria of the International Myeloma Working Group identify WB-MRI and fluorodeoxyglucose positron emission tomography/computed tomography (FDG-PET/CT) as the most sensitive imaging techniques for detecting skeletal and extra-skeletal MM invasion, respectively. Preliminary findings have also shown that WB-MRI is better than CT and equal to PET/CT in staging aggressive lymphoma and Hodgkin lymphoma, whereas MRI is better for diagnosing BMI in patients with low-grade lymphoma...
February 12, 2018: Leukemia & Lymphoma
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