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Diffusion weighted imaging

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https://www.readbyqxmd.com/read/28453880/predicting-postnatal-renal-function-of-prenatally-detected-posterior-urethral-valves-using-fetal-diffusion-weighted-magnetic-resonance-imaging-with-apparent-diffusion-coefficient-determination
#1
Alice Faure, Nicoleta Panait, Michel Panuel, Pierre Alessandrini, Claude D'Ercole, Kathia Chaumoitre, Thierry Merrot
METHODS: Between 2003 and 2014, 11 MRI were performed on fetuses (between 28-32 weeks) in whom second trimester sonography suggested severe bilateral urinary tract anomalies, suspected of PUV. RESULTS: The ADC of the 11 fetuses ranged from 1.3 to 2.86 mm2 s - 1 (median = 1.79 mm2s - 1, normal range for fetal kidney: 1.1-1.8). Two pregnancies with ADC > 2.6 mm2s - 1 were interrupted; the autopsy confirmed PUV and Potter syndrome. For the remaining nine babies, the follow-up was 5...
April 28, 2017: Prenatal Diagnosis
https://www.readbyqxmd.com/read/28453516/on-a-fractional-order-calculus-model-in-diffusion-weighted-breast-imaging-to-differentiate-between-malignant-and-benign-breast-lesions-detected-on-x-ray-screening-mammography
#2
Sebastian Bickelhaupt, Franziska Steudle, Daniel Paech, Anna Mlynarska, Tristan Anselm Kuder, Wolfgang Lederer, Heidi Daniel, Martin Freitag, Stefan Delorme, Heinz-Peter Schlemmer, Frederik Bernd Laun
OBJECTIVE: To evaluate a fractional order calculus (FROC) model in diffusion weighted imaging to differentiate between malignant and benign breast lesions in breast cancer screening work-up using recently introduced parameters (βFROC, DFROC and μFROC). MATERIALS AND METHODS: This retrospective analysis within a prospective IRB-approved study included 51 participants (mean 58.4 years) after written informed consent. All patients had suspicious screening mammograms and indication for biopsy...
2017: PloS One
https://www.readbyqxmd.com/read/28449168/mri-sequences-in-head-neck-radiology-state-of-the-art
#3
Gerlig Widmann, Benjamin Henninger, Christian Kremser, Werner Jaschke
Background Magnetic resonance imaging (MRI) has become an essential imaging modality for the evaluation of head & neck pathologies. However, the diagnostic power of MRI is strongly related to the appropriate selection and interpretation of imaging protocols and sequences. The aim of this article is to review state-of-the-art sequences for the clinical routine in head & neck MRI and to describe the evidence for which medical question these sequences and techniques are useful. Method Literature review of state-of-the-art sequences in head & neck MRI...
May 2017: RöFo: Fortschritte Auf Dem Gebiete der Röntgenstrahlen und der Nuklearmedizin
https://www.readbyqxmd.com/read/28448683/magnetic-resonance-imaging-connectivity-for-the-prediction-of-seizure-outcome-in-temporal-lobe-epilepsy
#4
Victoria L Morgan, Dario J Englot, Baxter P Rogers, Bennett A Landman, Ahmet Cakir, Bassel W Abou-Khalil, Adam W Anderson
OBJECTIVE: Currently, approximately 60-70% of patients with unilateral temporal lobe epilepsy (TLE) remain seizure-free 3 years after surgery. The goal of this work was to develop a presurgical connectivity-based biomarker to identify those patients who will have an unfavorable seizure outcome 1-year postsurgery. METHODS: Resting-state functional and diffusion-weighted 3T magnetic resonance imaging (MRI) was acquired from 22 unilateral (15 right, 7 left) patients with TLE and 35 healthy controls...
April 27, 2017: Epilepsia
https://www.readbyqxmd.com/read/28448418/effects-of-b-value-on-quantification-of-rapid-diffusion-kurtosis-imaging-in-normal-and-acute-ischemic-brain-tissues
#5
Ming-Chung Chou, Cheng-Wen Ko, Yu-Hsien Chiu, Hsiao-Wen Chung, Ping-Hong Lai
PURPOSE: Diffusion kurtosis imaging (DKI) has been widely used to characterize brain tissue alterations. Diffusion-weighting factor or b value plays an important role in the measurement of rapid DKI and may have influential effects on them. The purpose of this study was to investigate the effects of b value on rapid DKI indices in normal and acute ischemic brain tissues. MATERIALS AND METHODS: This study enrolled 10 healthy subjects and 4 acute ischemic stroke patients...
April 26, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28448409/assessing-synovitis-and-bone-erosion-with-apparent-diffusion-coefficient-in-early-stage-of-rheumatoid-arthritis
#6
Jin Qu, Xinwei Lei, Ying Zhan, Huixia Li, Yu Zhang
PURPOSE: The aim of this study was to assess the value of apparent diffusion coefficient (ADC) in distinguishing synovitis from joint fluid and bone erosion from cysts. METHODS: Twenty-eight patients with suspected rheumatoid arthritis underwent diffusion-weighted imaging and pre- and post-contrast-enhanced magnetic resonance imaging. The mean ADC values were compared between synovitis and joint effusion and between bone erosion and cyst. RESULTS: Mean ADC value of synovitis was significantly lower than that of the joint effusion (2...
April 26, 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28446945/diffusion-tensor-imaging-for-glioma-grading-analysis-of-fiber-density-index
#7
Fariba Davanian, Fariborz Faeghi, Sohrab Shahzadi, Zahra Farshifar
INTRODUCTION: The most common primary tumors of brain are gliomas and tumor grading is essential for designing proper treatment strategies. The gold standard choice to determine grade of glial tumor is biopsy which is an invasive method. The purpose of this study was to investigate the role of fiber density index (FDi) by means of diffusion tensor imaging (DTI) (as a noninvasive method) in glial tumor grading. METHODS: A group of 20 patients with histologically confirmed diagnosis of gliomas were evaluated in this study...
January 2017: Basic and Clinical Neuroscience
https://www.readbyqxmd.com/read/28445894/radiologic-differences-between-human-papillomavirus-related-and-human-papillomavirus-unrelated-oropharyngeal-carcinoma-on-diffusion-weighted-imaging
#8
Sarah Deschuymer, Sandra Nuyts
No abstract text is available yet for this article.
April 27, 2017: ORL; Journal for Oto-rhino-laryngology and its related Specialties
https://www.readbyqxmd.com/read/28443292/measurements-of-metastatic-renal-cell-tumours-as-determined-by-diffusion-weighted-imaging-or-computed-tomography-are-in-close-agreement-a-pilot-study
#9
J Farnebo, C Suzuki, R Vargas-Paris, P Sandström, L Blomqvist
BACKGROUND: Diffusion weighted magnetic resonance imaging (DWI) provides both functional and anatomical information regarding tumours but can also be used for tumour detection. Today, tumour treatment response in clinical trials is mainly assessed on Computed Tomography (CT) using established criteria. Despite availability of dedicated software, CT still requires significant manual work for selection and measurement in treatment response evaluation of solid tumours. PURPOSE: To compare the maximum diameter of tumour lesions on CT with the corresponding measurements on diffusion weighted images...
2017: European Journal of Radiology Open
https://www.readbyqxmd.com/read/28443160/correlation-between-preoperative-magnetic-resonance-imaging-signal-intensity-changes-and-clinical-outcomes-in-patients-surgically-treated-for-cervical-myeloradiculopathy
#10
Chaitanya Baban Chikhale, Ketan Shripad Khurjekar, Ashok Kumar Shyam, Parag Kantilal Sancheti
STUDY DESIGN: This was a single surgeon, single center-based retrospective study with prospective data collection. PURPOSE: To assess the correlation between T2-weighted magnetic resonance imaging (MRI) signal intensity (SI) changes and factors such as age, duration of symptoms, baseline modified Japanese Orthopedic Association (mJOA) score and to determine its prognostic value in predicting recovery after surgery. OVERVIEW OF LITERATURE: Whether intramedullary cord T2-weighted MRI SI changes can predict operative outcomes of cervical myeloradiculopathy remains debatable, with only a few prospective studies analyzing the same...
April 2017: Asian Spine Journal
https://www.readbyqxmd.com/read/28441447/tumor-response-assessment-by-mri-following-stereotactic-body-radiation-therapy-for-hepatocellular-carcinoma
#11
Guillaume Oldrini, Andres Huertas, Sophie Renard-Oldrini, Hélène Taste-George, Guillaume Vogin, Valérie Laurent, Julia Salleron, Philippe Henrot
BACKGROUND: To evaluate the MRI features of a tumor response, local control, and predictive factors of local control after stereotactic body radiation therapy (SBRT) for hepatocellular carcinoma (HCC). METHODS: Thirty-five consecutive patients with 48 HCCs who were treated by SBRT were included in this retrospective study. All patients provided written informed consent to be treated by SBRT, and prior to inclusion they authorized use of the treatment data for further studies...
2017: PloS One
https://www.readbyqxmd.com/read/28441370/conventional-modalities-and-novel-emerging-imaging-techniques-for-musculoskeletal-tumors
#12
Meera Raghavan
BACKGROUND: Imaging of musculoskeletal tumors requires a multimodality approach and includes radiography, computed tomography (CT), and magnetic resonance imaging (MRI). METHODS: Topics related to primary bone and soft-tissue tumors are reviewed. The fundamental imaging principles are discussed as well as the applications of emerging imaging modalities. RESULTS: MRI is the preferred technique for the evaluation of musculoskeletal tumors, whereas other imaging modalities play a complementary role...
April 2017: Cancer Control: Journal of the Moffitt Cancer Center
https://www.readbyqxmd.com/read/28441051/diffusion-weighted-magnetic-resonance-imaging-of-the-brain-of-neurologically-normal-dogs
#13
Megan J MacLellan, Christopher P Ober, Daniel A Feeney, Carl R Jessen
OBJECTIVE To acquire MRI diffusion data (apparent diffusion coefficient [ADC] and fractional anisotropy [FA] values, including separate measures for gray and white matter) at 3.0 T for multiple locations of the brain of neurologically normal dogs. ANIMALS: 13 neurologically normal dogs recruited from a group of patients undergoing tibial plateau leveling osteotomy. PROCEDURES: MRI duration ranged from 20 to 30 minutes, including obtaining preliminary images to exclude pathological changes (T2-weighted fluid-attenuated inversion recovery transverse and dorsal images) and diffusion-weighted images...
May 2017: American Journal of Veterinary Research
https://www.readbyqxmd.com/read/28440586/comparison-of-preoperative-quantitative-magnetic-resonance-imaging-and-clinical-assessment-of-deep-pain-perception-as-prognostic-tools-for-early-recovery-of-motor-function-in-paraplegic-dogs-with-intervertebral-disk-herniations
#14
A Wang-Leandro, J S Siedenburg, M K Hobert, P Dziallas, K Rohn, V M Stein, A Tipold
BACKGROUND: Prognostic tools to predict early postoperative motor function recovery (MFR) after thoracolumbar intervertebral disk herniation (IVDH) in paraplegic dogs represent an opportunity to timely implement novel therapies that could shorten recovery times and diminish permanent neurological dysfunctions. HYPOTHESIS: Fractional anisotropy (FA) values obtained using diffusion tensor imaging have a higher prognostic value than a lesion extension ratio in T2-weighted images (T2W-LER) and clinical assessment of deep pain perception (DPP) for MFR...
April 25, 2017: Journal of Veterinary Internal Medicine
https://www.readbyqxmd.com/read/28439776/preoperative-grading-of-supratentorial-nonenhancing-gliomas-by-high-b-value-diffusion-weighted-3%C3%A2-t-magnetic-resonance-imaging
#15
Haiwei Han, Chengkun Han, Xiurong Wu, Shan Zhong, Xiongjie Zhuang, Guowei Tan, Hua Wu
The purpose of this study was to determine the difference in discrimination between high- and low-grade supratentorial nonenhancing gliomas (HGGs and LGGs, respectively) when using apparent diffusion coefficient (ADC) values with high or standard b-value. Thirty-nine patients underwent conventional magnetic resonance imaging and diffusion-weighted imaging (DWI) with standard and high b-values (b = 1000 and 3000 s/mm(2), respectively). Minimum, maximum, and mean ADC values (ADCMIN, ADCMAX, and ADCMEAN, respectively) were measured from ADC maps with both b-values...
April 24, 2017: Journal of Neuro-oncology
https://www.readbyqxmd.com/read/28439324/contemporary-diagnostic-imaging-of-oral-squamous-cell-carcinoma-a-review-of-literature
#16
REVIEW
Paulina Pałasz, Łukasz Adamski, Magdalena Górska-Chrząstek, Anna Starzyńska, Michał Studniarek
Oral squamous cell carcinoma (OSCC) is the most common cancer of the oral cavity and constitutes 95% of all cancers of this area. Men are affected twice as commonly as women, primarily if they are over 50 years of age. Forty percent of the lesions are localized in the tongue and 30% in the floor of the oral cavity. OSCC often affects upper and lower gingiva, buccal mucous membrane, the retromolar triangle and the palate. The prognosis is poor and the five-year survival rate ranges from 20% (OSCC in the floor of the mouth) to 60% (OSCC in the alveolar part of the mandible)...
2017: Polish Journal of Radiology
https://www.readbyqxmd.com/read/28439045/correction-to-successful-reperfusion-with-mechanical-thrombectomy-is-associated-with-reduced-disability-and-mortality-in-patients-with-pretreatment-diffusion-weighted-imaging-alberta-stroke-program-early-computed-tomography-score-%C3%A2-6
#17
https://www.readbyqxmd.com/read/28438714/the-effect-of-morphological-and-microstructural-integrity-of-the-corpus-callosum-on-cognition-fatigue-and-depression-in-mildly-disabled-ms-patients
#18
Jeroen Van Schependom, Jeroen Gielen, Jorne Laton, Georgios Sotiropoulos, Anne-Marie Vanbinst, Johan De Mey, Dirk Smeets, Guy Nagels
Aim To assess the value of callosal morphological and microstructural integrity in assessing different cognitive domains, fatigue and depression in mildly disabled multiple sclerosis (MS) patients. MATERIALS AND METHODS: We assessed 29 mildly disabled MS patients and 15 healthy controls using 3T magnetic resonance images (T1-weighted, FLAIR and DTI) and neuropsychological tests assessing different cognitive functions, depression and fatigue. We compared the added value of morphological measures (corpus callosum area corrected for total intracranial volume, index, circularity and the more detailed thickness profile) and diffusion features (fractional anisotropy and mean diffusivity) in multilinear models including standard clinical and whole-brain parameters in assessing neuropsychological scores...
April 21, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/28438712/empirical-consideration-of-the-effects-of-acquisition-parameters-and-analysis-model-on-clinically-feasible-q-ball-imaging
#19
Kurt Schilling, Vishwesh Nath, Justin A Blaber, Prasanna Parvathaneni, Adam W Anderson, Bennett A Landman
Q-ball imaging (QBI) is a popular high angular resolution diffusion imaging (HARDI) technique used to study brain architecture in vivo. Simulation and phantom-based studies suggest that QBI results are affected by the b-value, the number of diffusion weighting directions, and the signal-to-noise ratio (SNR). However, optimal acquisition schemes for QBI in clinical settings are largely undetermined given empirical (observed) imaging considerations. In this study, we acquire a HARDI dataset at five b-values with 11 repetitions on a single subject to investigate the effects of acquisition scheme and subsequent analysis models on the accuracy and precision of measures of tissue composition and fiber orientation derived from clinically feasible QBI at 3T...
April 21, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/28438666/how-to-choose-the-right-mr-sequence-for-your-research-question-at-7-t-and-above
#20
José P Marques, David G Norris
The choice of a pulse sequence at ultra-high field can be influenced by a number of considerations and constraints that are not always the same as those at lower fields. Foremost amongst these is of course the information required and the time available, but considerations of static main field- and transmit field- inhomogeneities as well as power deposition can also play an important role. In this review we first briefly examine the characteristics of high field MRI, and then describe the performance and constraints relevant to the major imaging readouts, and their implementation with parallel imaging techniques...
April 21, 2017: NeuroImage
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