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Diffusion MRI

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https://www.readbyqxmd.com/read/29678542/effect-of-intravascular-contrast-agent-on-diffusion-and-perfusion-fraction-coefficients-in-the-peripheral-zone-and-prostate-cancer
#1
Yousef Mazaheri, Andreas M Hötker, Amita Shukla-Dave, Oguz Akin, Hedvig Hricak
PURPOSE: To determine whether water diffusion and the perfusion fraction coefficients in prostate peripheral zone (PZ) and prostate cancer (PCa) are affected by intravenous contrast injection and explore the potential mechanism behind previously reported differences between pre- and post-contrast ADC values. METHODS: Our institutional review board waived informed consent for this HIPAA-compliant, retrospective study, which included 32 patients (median age, 63 years; range, 47-77 years) with biopsy-proven, untreated PCa who underwent 3-Tesla MRI, including DW-MRI at b-values 0, 400, 700, 1000 s/mm2 before and after gadolinium injection...
April 17, 2018: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/29678540/quantitative-diffusion-mri-using-reduced-field-of-view-and-multi-shot-acquisition-techniques-validation-in-phantoms-and-prostate-imaging
#2
Yuxin Zhang, James Holmes, Iñaki Rabanillo, Arnaud Guidon, Shane Wells, Diego Hernando
PURPOSE: To evaluate the reproducibility of quantitative diffusion measurements obtained with reduced Field of View (rFOV) and Multi-shot EPI (msEPI) acquisitions, using single-shot EPI (ssEPI) as a reference. METHODS: Diffusion phantom experiments, and prostate diffusion-weighted imaging in healthy volunteers and patients with known or suspected prostate cancer were performed across the three different sequences. Quantitative diffusion measurements of apparent diffusion coefficient, and diffusion kurtosis parameters (healthy volunteers), were obtained and compared across diffusion sequences (rFOV, msEPI, and ssEPI)...
April 17, 2018: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/29677346/reduced-functional-and-anatomic-interhemispheric-homotopic-connectivity-in-primary-open-angle-glaucoma-a-combined-resting-state-fmri-and-dti-study
#3
Qian Wang, Weiwei Chen, Huaizhou Wang, Xun Zhang, Xiaoxia Qu, Ying Wang, Ting Li, Ningli Wang, Junfang Xian
Purpose: To investigate if abnormal interhemispheric homotopic functional connectivity were accompanied by corresponding anatomic connectivity changes in primary open-angle glaucoma (POAG) patients, and to relate connectivity changes with retinal nerve fiber layer (RNFL) thickness and ganglion cell complex (GCC) thickness. Methods: Resting-state functional magnetic resonance imaging (rs-fMRI) and diffusion tensor imaging (DTI) were performed in 16 POAG patients and 19 healthy controls...
April 1, 2018: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29676860/diagnostic-performance-of-diffusion-weighted-imaging-for-differentiating-benign-and-malignant-gallbladder-lesions-a-systematic-review-and-meta-analysis
#4
Myung-Won You, Seong Jong Yun
BACKGROUND: Although diffusion-weighted imaging (DWI) has been characterized as an alternative imaging modality for gallbladder (GB) lesions, it has not been routinely used in clinical practice because of relatively low signal-to-noise ratio. PURPOSE: To assess the sensitivity and specificity of the diagnostic performance of DWI for differentiating benign and malignant GB lesions. STUDY TYPE: Meta-analysis. POPULATION: Patients with GB lesions...
April 20, 2018: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29676844/differentiation-of-brain-infection-from-necrotic-glioblastoma-using-combined-analysis-of-diffusion-and-perfusion-mri
#5
Sanjeev Chawla, Sumei Wang, Suyash Mohan, MacLean Nasrallah, Gaurav Verma, Steven Brem, Donald M O'Rourke, Ronald L Wolf, Harish Poptani, S Ali Nabavizadeh
BACKGROUND: Accurate differentiation of brain infections from necrotic glioblastomas (GBMs) may not always be possible on morphologic MRI or on diffusion tensor imaging (DTI) and dynamic susceptibility contrast perfusion-weighted imaging (DSC-PWI) if these techniques are used independently. PURPOSE: To investigate the combined analysis of DTI and DSC-PWI in distinguishing brain injections from necrotic GBMs. STUDY TYPE: Retrospective. POPULATION: Fourteen patients with brain infections and 21 patients with necrotic GBMs...
April 20, 2018: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29675944/advanced-mr-diffusion-imaging-and-chemotherapy-related-changes-in-cerebral-white-matter-microstructure-of-survivors-of-childhood-bone-and-soft-tissue-sarcoma
#6
Charlotte Sleurs, Jurgen Lemiere, Daan Christiaens, Thibo Billiet, Ronald Peeters, Stefan Sunaert, Anne Uyttebroeck, Sabine Deprez
With the increase of survival rates of pediatric cancer patients, the number of children facing potential cognitive sequelae has grown. Previous adult studies suggest that white matter (WM) microstructural changes may contribute to cognitive impairment. This study aims to investigate WM microstructure in childhood bone and soft tissue sarcoma. Differences in (micro-)structure can be investigated using diffusion MRI (dMRI). The typically used diffusion tensor model (DTI) assumes Gaussian diffusion, and lacks information about fiber populations...
April 20, 2018: Human Brain Mapping
https://www.readbyqxmd.com/read/29675474/brain-tumor-characterization-using-multibiometric-evaluation-of-mri
#7
Faris Durmo, Jimmy Lätt, Anna Rydelius, Silke Engelholm, Sara Kinhult, Krister Askaner, Elisabet Englund, Johan Bengzon, Markus Nilsson, Isabella M Björkman-Burtscher, Thomas Chenevert, Linda Knutsson, Pia C Sundgren
The aim was to evaluate volume, diffusion, and perfusion metrics for better presurgical differentiation between high-grade gliomas (HGG), low-grade gliomas (LGG), and metastases (MET). For this retrospective study, 43 patients with histologically verified intracranial HGG (n = 18), LGG (n = 10), and MET (n = 15) were chosen. Preoperative magnetic resonance data included pre- and post-gadolinium contrast-enhanced T1-weighted fluid-attenuated inversion recover, cerebral blood flow (CBF), cerebral blood volume (CBV), fractional anisotropy, and apparent diffusion coefficient maps used for quantification of magnetic resonance biometrics by manual delineation of regions of interest...
March 2018: Tomography: a Journal for Imaging Research
https://www.readbyqxmd.com/read/29673894/anisotropy-of-anomalous-diffusion-improves-the-accuracy-of-differentiating-low-and-high-grade-cerebral-gliomas
#8
Boyan Xu, Lu Su, Zhenxiong Wang, Yang Fan, Gaolang Gong, Wenzhen Zhu, Peiyi Gao, Jia-Hong Gao
BACKGROUND: Anomalous diffusion model has been introduced and shown to be beneficial in clinical applications. However, only the directionally averaged values of anomalous diffusion parameters were investigated, and the anisotropy of anomalous diffusion remains unexplored. The aim of this study was to demonstrate the feasibility of using anisotropy of anomalous diffusion for differentiating low- and high-grade cerebral gliomas. METHODS: Diffusion MRI images were acquired from brain tumor patients and analyzed using the fractional motion (FM) model...
April 16, 2018: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/29672976/dual-frequency-irradiation-cest-mri-of-endogenous-bulk-mobile-proteins
#9
Steffen Goerke, Johannes Breitling, Moritz Zaiss, Johannes Windschuh, Patrick Kunz, Patrick Schuenke, Daniel Paech, Dario L Longo, Karel D Klika, Mark E Ladd, Peter Bachert
A novel MRI contrast is proposed which enables the selective detection of endogenous bulk mobile proteins in vivo. Such a non-invasive imaging technique may be of particular interest for many diseases associated with pathological alterations of protein expression, such as cancer and neurodegenerative disorders. Specificity to mobile proteins was achieved by the selective measurement of intramolecular spin diffusion and the removal of semi-solid macromolecular signal components by a correction procedure. For this purpose, the approach of chemical exchange saturation transfer (CEST) was extended to a radiofrequency (RF) irradiation scheme at two different frequency offsets (dualCEST)...
April 19, 2018: NMR in Biomedicine
https://www.readbyqxmd.com/read/29672664/longitudinal-brain-imaging-in-preclinical-alzheimer-disease-impact-of-apoe-%C3%A9-4-genotype
#10
Shruti Mishra, Tyler M Blazey, David M Holtzman, Carlos Cruchaga, Yi Su, John C Morris, Tammie L S Benzinger, Brian A Gordon
While prior work reliably demonstrates that the APOE ɛ4 allele has deleterious group level effects on Alzheimer disease pathology, the homogeneity of its influence across the lifespan and spatially in the brain remains unknown. Further it is unclear what combinations of factors at an individual level lead to observed group level effects of APOE genotype. To evaluate the impact of the APOE genotype on disease trajectories, we examined longitudinal MRI and PET imaging in a cohort of 497 cognitively normal middle and older aged participants...
April 17, 2018: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/29671057/accurate-ivim-model-based-liver-lesion-characterisation-can-be-achieved-with-only-three-b-value-dwi
#11
P Mürtz, A M Sprinkart, M Reick, C C Pieper, A-H Schievelkamp, R König, H H Schild, W A Willinek, G M Kukuk
OBJECTIVE: The objective of this study was to evaluate a simplified intravoxel incoherent motion (IVIM) approach of diffusion-weighted imaging (DWI) with four b-values for liver lesion characterisation at 1.5 T. METHODS: DWI data from a respiratory-gated MRI sequence with b = 0, 50, 250, 800 s/mm2 were retrospectively analysed in 173 lesions and 40 healthy livers. The apparent diffusion coefficient ADC = ADC(0,800) and IVIM-based parameters D1 ' = ADC(50,800), D2 ' =ADC(250,800), f1 ', f2 ', D*', ADClow = ADC(0,50), and ADCdiff =ADClow -D2 ' were calculated voxel-wise without fitting procedures...
April 18, 2018: European Radiology
https://www.readbyqxmd.com/read/29671001/cervical-spine-prospective-feasibility-study-dynamic-flexion-extension-diffusion-tensor-weighted-magnetic-resonance-imaging
#12
Bawarjan Schatlo, Luca Remonda, Philipp Gruber, Javier Fandino, Veit Rohde, Ali-Reza Fathi, Jatta Berberat
PURPOSE: Diffusion tensor imaging (DTI) in flexion-extension may serve as a diagnostic tool to improve the sensitivity for detection of myelopathy. In this study, the feasibility and reproducibility of dynamic DTI in the cervical spinal cord was assessed in healthy volunteers and patients. METHODS: All subjects were examined in maximum neck flexion-extension in a 3T magnetic resonance imaging (MRI) scanner. Range of motion, space available for the spinal cord, fractional anisotropy (FA) and apparent diffusion coefficient (ADC) were measured and compared between the neck positions...
April 18, 2018: Clinical Neuroradiology
https://www.readbyqxmd.com/read/29670903/apparent-diffusion-coefficient-of-diffusion-weighted-imaging-in-evaluation-of-cervical-intervertebral-disc-degeneration-an-observational-study-with-3-0-t-magnetic-resonance-imaging
#13
Pinjie Chen, Chunlei Wu, Minghua Huang, Guangjian Jin, Qinglei Shi, Zhihua Han, Chun Chen
Aims: To investigate the correlation between the apparent diffusion coefficient (ADC) value and cervical intervertebral disc degeneration in adult symptomatic patients. Methods: A total of 52 symptomatic and 40 healthy volunteers were included. DWI and routine MRI examinations were performed to their cervical spines. The cervical discs (from C2-C3 to C6-C7) were graded according to the Pfirrmann grading system, and ADC values of the nucleus pulposus (NP) were measured...
2018: BioMed Research International
https://www.readbyqxmd.com/read/29669584/mri-based-response-patterns-during-neoadjuvant-chemotherapy-can-predict-pathological-complete-response-in-patients-with-breast-cancer
#14
Briete Goorts, Kelly M A Dreuning, Janneke B Houwers, Loes F S Kooreman, Evert-Jan G Boerma, Ritse M Mann, Marc B I Lobbes, Marjolein L Smidt
BACKGROUND: The main purpose was to investigate the correlation between magnetic resonance imaging (MRI)-based response patterns halfway through neoadjuvant chemotherapy and immunotherapy (NAC) and pathological tumor response in patients with breast cancer. Secondary purposes were to compare the predictive value of MRI-based response patterns measured halfway through NAC and after NAC and to measure interobserver variability. METHODS: All consecutive patients treated with NAC for primary invasive breast cancer from 2012 to 2015 and who underwent breast MRI before, halfway through (and after) NAC were included...
April 18, 2018: Breast Cancer Research: BCR
https://www.readbyqxmd.com/read/29669134/giant-olfactory-groove-meningioma-2-staged-approach-2-dimensional-operative-video
#15
Alexandre B Todeschini, Mostafa Shahein, Alaa S Montaser, Douglas Hardesty, Bradley A Otto, Ricardo L Carrau, Daniel M Prevedello
A 42-yr-old female presented with an olfactory groove meningioma causing progressive vision loss and anosmia. Given the size of the tumor, we opted for a 2-stage surgery: endoscopic endonasal approach (EEA) followed by a craniotomy. Stage I surgery was a transcribriform transplanum EEA using a binostril 4-hand/2 surgeons (ENT and neuro) technique, with the patient positioned supine with the head slightly turned to the right side and tilted to the left, fixed in a 3-pin head clamp, under imaging guidance, in which we drilled out all the affected skull base bone, devascularized and debulked the tumor...
April 16, 2018: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/29668721/ultra-high-field-mri-of-human-hippocampi-morphological-and-multiparametric-differentiation-of-hippocampal-sclerosis-subtypes
#16
Clarissa Gillmann, Roland Coras, Karl Rössler, Arnd Doerfler, Michael Uder, Ingmar Blümcke, Tobias Bäuerle
The aim of the present study is to differentiate subtypes of hippocampal sclerosis (HS) using ex vivo ultra-high field magnetic resonance imaging (MRI). Included were 14 surgically resected hippocampi of patients with medically intractable temporal lobe epilepsy. The resected hippocampi were histologically categorized into subtypes of hippocampal sclerosis (HS type 1 (n = 10), HS type 2 (n = 2) and no-HS (n = 2)) and subsequently scanned on a preclinical 7T MRI acquiring T2-weighted morphology, relaxometry and diffusion tensor imaging...
2018: PloS One
https://www.readbyqxmd.com/read/29668333/blood-biomarkers-in-ischemic-stroke-potential-role-and-challenges-in-clinical-practice-and-research
#17
Konstantinos Makris, Alexander Haliassos, Maria Chondrogianni, Georgios Tsivgoulis
Fast and accurate diagnosis of stroke is crucial for the immediate application of the right therapy to patients. However, rapid diagnosis is still a challenge since an ischemic stroke cannot be identified based only on clinical assessment. CT or MRI imaging is required to rule out hemorrhagic stroke since thrombolytic therapy can lead to increased intracranial bleeding and further aggravation of hemorrhagic stroke. In addition, clinical situations that imitate the signs and symptoms of stroke may also impede the rapid diagnosis and treatment of stroke victims...
April 18, 2018: Critical Reviews in Clinical Laboratory Sciences
https://www.readbyqxmd.com/read/29667881/the-ability-of-adc-measurements-in-the-assessment-of-patients-with-stage-i-endometrial-carcinoma-based-on-three-risk-categories
#18
Shijia Wang, Jia Liu, Feng Yuan, Xiaojun Chen, Fenghua Ma, Guofu Zhang, Xiaomei Tian
Background Better selection of patients with intermediate and high-risk stage I endometrial carcinoma (EC) for lymphadenectomy has an important effect on the prognosis. Purpose To investigate the role of apparent diffusion coefficient (ADC) measurements in the assessment of stage I EC patients based on three risk categories. Material and Methods We retrospectively studied 80 patients with EC and 28 cervical cancer patients with normal endometrium. 1.5-T conventional magnetic resonance imaging (MRI) and diffusion-weighted imaging (DWI) (b = 0, 1000 s/mm2 ) were performed, and ADC values were calculated...
January 1, 2018: Acta Radiologica
https://www.readbyqxmd.com/read/29667086/contrast-enhancement-predicting-survival-in-integrated-molecular-subtypes-of-diffuse-glioma-an-observational-cohort-study
#19
Johann-Martin Hempel, Cornelia Brendle, Benjamin Bender, Georg Bier, Marco Skardelly, Irina Gepfner-Tuma, Franziska Eckert, Ulrike Ernemann, Jens Schittenhelm
INTRODUCTION: To assess the predictive value of magnetic resonance imaging (MRI) gadolinium enhancement as a prognostic factor in the 2016 World Health Organization Classification of Tumors of the Central Nervous System integrated glioma groups. METHODS: Four-hundred fifty patients with histopathologically confirmed glioma were retrospectively assessed between 07/1997 and 06/2014 using gadolinium enhancement, survival, and relevant prognostic molecular data [isocitrate dehydrogenase (IDH); alpha-thalassemia/mental retardation syndrome X-linked (ATRX); chromosome 1p/19q loss of heterozygosity; and O6-methylguanine DNA methyltransferase (MGMT)]...
April 17, 2018: Journal of Neuro-oncology
https://www.readbyqxmd.com/read/29666984/unusual-white-matter-involvement-in-east-syndrome-associated-with-novel-kcnj10-mutations
#20
Mariasavina Severino, Susanna Lualdi, Chiara Fiorillo, Pasquale Striano, Teresa De Toni, Silvio Peluso, Giuseppe De Michele, Andrea Rossi, Mirella Filocamo, Claudio Bruno
BACKGROUND: Epilepsy, ataxia, sensorineural deafness, and tubulopathy (EAST syndrome) is a rare channelopathy due to KCNJ10 mutations. So far, only mild cerebellar hypoplasia and/or dentate nuclei abnormalities have been reported as major neuroimaging findings in these patients. METHODS: We analyzed the clinical and brain MRI features of two unrelated patients (aged 27 and 23 years) with EAST syndrome carrying novel homozygous frameshift mutations (p.Asn232Glnfs*14and p...
April 17, 2018: Journal of Neurology
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