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Dynamic contrasted enhance MRI

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https://www.readbyqxmd.com/read/29676844/differentiation-of-brain-infection-from-necrotic-glioblastoma-using-combined-analysis-of-diffusion-and-perfusion-mri
#1
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/29675932/quantification-of-liver-function-by-linearization-of-a-two-compartment-model-of-gadoxetic-acid-uptake-using-dynamic-contrast-enhanced-magnetic-resonance-imaging
#2
Josiah Simeth, Adam Johansson, Dawn Owen, Kyle Cuneo, Michelle Mierzwa, Mary Feng, Theodore S Lawrence, Yue Cao
Dynamic gadoxetic acid-enhanced magnetic resonance imaging (MRI) allows the investigation of liver function through the observation of the perfusion and uptake of contrast agent in the parenchyma. Voxel-by-voxel quantification of the contrast uptake rate (k1 ) from dynamic gadoxetic acid-enhanced MRI through the standard dual-input, two-compartment model could be susceptible to overfitting of variance in the data. The aim of this study was to develop a linearized, but more robust, model. To evaluate the estimated k1 values using this linearized analysis, high-temporal-resolution gadoxetic acid-enhanced MRI scans were obtained in 13 examinations, and k1 maps were created using both models...
April 19, 2018: NMR in Biomedicine
https://www.readbyqxmd.com/read/29672922/myocardial-perfusion-quantification-using-simultaneously-acquired-13-nh-3-ammonia-pet-and-dynamic-contrast-enhanced-mri-in-patients-at-rest-and-stress
#3
Karl P Kunze, Stephan G Nekolla, Christoph Rischpler, Shelley HuaLei Zhang, Carmel Hayes, Nicolas Langwieser, Tareq Ibrahim, Karl-Ludwig Laugwitz, Markus Schwaiger
PURPOSE: Systematic differences with respect to myocardial perfusion quantification exist between DCE-MRI and PET. Using the potential of integrated PET/MRI, this study was conceived to compare perfusion quantification on the basis of simultaneously acquired 13 NH3 -ammonia PET and DCE-MRI data in patients at rest and stress. METHODS: Twenty-nine patients were examined on a 3T PET/MRI scanner. DCE-MRI was implemented in dual-sequence design and additional T1 mapping for signal normalization...
April 19, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29670156/an-automated-skin-segmentation-of-breasts-in-dynamic-contrast-enhanced-magnetic-resonance-imaging
#4
Chia-Yen Lee, Tzu-Fang Chang, Nai-Yun Chang, Yeun-Chung Chang
Dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) is used to diagnose breast disease. Obtaining anatomical information from DCE-MRI requires the skin be manually removed so that blood vessels and tumors can be clearly observed by physicians and radiologists; this requires considerable manpower and time. We develop an automated skin segmentation algorithm where the surface skin is removed rapidly and correctly. The rough skin area is segmented by the active contour model, and analyzed in segments according to the continuity of the skin thickness for accuracy...
April 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29663411/breast-cancer-mri-radiomics-an-overview-of-algorithmic-features-and-impact-of-inter-reader-variability-in-annotating-tumors
#5
Ashirbani Saha, Michael R Harowicz, Maciej A Mazurowski
PURPOSE: To review features used in MRI radiomics of breast cancer and study the inter-reader stability of the features METHODS: We implemented 529 algorithmic features that can be extracted from tumor and fibroglandular tissue (FGT) in breast MRIs. The features were identified based on a review of the existing literature with consideration of their usage, prognostic ability, and uniqueness. The set was then extended so that it comprehensively describes breast cancer imaging characteristics...
April 16, 2018: Medical Physics
https://www.readbyqxmd.com/read/29662622/quantitative-parameters-in-dynamic-contrast-enhanced-magnetic-resonance-imaging-for-the-detection-and-characterization-of-prostate-cancer
#6
Cheng Wei, Bowen Jin, Magdalena Szewczyk-Bieda, Stephen Gandy, Stephen Lang, Yilong Zhang, Zhihong Huang, Ghulam Nabi
Objectives: to assess the diagnostic accuracy of quantitative parameters of DCE-MRI in multi-parametric MRI (mpMRI) in comparison to the histopathology (including Gleason grade) of prostate cancer. Patients and methods: 150 men with suspected prostate cancer (abnormal digital rectum examination and or elevated prostate-specific antigen) received pre-biopsy 3T mpMRI and were recruited into peer-reviewed, protocol-based prospective study. The DCE-MRI quantitative parameters ( Ktrans (influx transfer constant) and kep (efflux rate constant)) of the cancerous and normal areas were recorded using four different kinetic models employing Olea Sphere (Olea Medical, La Ciotat, France)...
March 23, 2018: Oncotarget
https://www.readbyqxmd.com/read/29657509/a-tensor-statistical-model-for-quantifying-dynamic-functional-connectivity
#7
Yingying Zhu, Xiaofeng Zhu, Minjeong Kim, Jin Yan, Guorong Wu
Functional connectivity (FC) has been widely investigated in many imaging-based neuroscience and clinical studies. Since functional Magnetic Resonance Image (MRI) signal is just an indirect reflection of brain activity, it is difficult to accurately quantify the FC strength only based on signal correlation. To address this limitation, we propose a learning-based tensor model to derive high sensitivity and specificity connectome biomarkers at the individual level from resting-state fMRI images. First, we propose a learning-based approach to estimate the intrinsic functional connectivity...
June 2017: Information Processing in Medical Imaging: Proceedings of the ... Conference
https://www.readbyqxmd.com/read/29650780/differentiating-atypical-hemangiomas-and-metastatic-vertebral-lesions-the-role-of-t1-weighted-dynamic-contrast-enhanced-mri
#8
K A Morales, J Arevalo-Perez, K K Peck, A I Holodny, E Lis, S Karimi
BACKGROUND AND PURPOSE: Vertebral hemangiomas are benign vascular lesions that are almost always incidentally found in the spine. Their classic typical hyperintense appearance on T1- and T2-weighted MR images is diagnostic. Unfortunately, not all hemangiomas have the typical appearance, and they can mimic metastases on routine MR imaging. These are generally referred to as atypical hemangiomas and can result in misdiagnosis and ultimately additional imaging, biopsy, and unnecessary costs...
April 12, 2018: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/29644993/apparent-diffusion-coefficient-to-subdivide-breast-imaging-reporting-and-data-system-magnetic-resonance-imaging-bi-rads-mri-category-4-lesions
#9
Dandan Liu, Zhaogui Ba, Xiaoli Ni, Linhong Wang, Dexin Yu, Xiangxing Ma
BACKGROUND This study aims to subdivide BI-RADS-MRI (Breast Imaging Reporting and Data System Magnetic Resonance Imaging) Category 4 lesions and to evaluate the role of Fischer's scoring system, apparent diffusion coefficient (ADC), and Fischer's + ADC in differential diagnosis of breast lesions. MATERIAL AND METHODS This study retrospectively analyzed the data of 143 patients (150 breast lesions), who were diagnosed by biopsy, and received dynamic contrast enhancement and diffusion-weighted imaging. The diagnostic efficacies of ADC, Fischer's scoring system, and the Fischer's + ADC were analyzed by the receiver operating characteristics curve...
April 12, 2018: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/29642773/dce-mri-derived-volume-transfer-constant-k-trans-and-dwi-apparent-diffusion-coefficient-as-predictive-markers-of-short-and-long-term-efficacy-of-chemoradiotherapy-in-patients-with-esophageal-cancer
#10
Zhi-Min Ye, Shu-Jun Dai, Feng-Qin Yan, Lei Wang, Jun Fang, Zhen-Fu Fu, Yue-Zhen Wang
This study aimed to evaluate both the short- and long-term efficacies of chemoradiotherapy in relation to the treatment of esophageal cancer . This was achieved through the use of dynamic contrast-enhanced magnetic resonance imaging-derived volume transfer constant and diffusion weighted imaging-derived apparent diffusion coefficient . Patients with esophageal cancer were assigned into the sensitive and resistant groups based on respective efficacies in chemoradiotherapy. Dynamic contrast-enhanced magnetic resonance imaging and diffusion weighted imaging were used to measure volume transfer constant and apparent diffusion coefficient, while computed tomography was used to calculate tumor size reduction rate...
January 1, 2018: Technology in Cancer Research & Treatment
https://www.readbyqxmd.com/read/29629800/comparison-of-visualization-rates-of-li-rads-version-2014-major-features-with-iv-gadobenate-dimeglumine-or-gadoxetate-disodium-in-patients-at-risk-for-hepatocellular-carcinoma
#11
Brian C Allen, Lisa M Ho, Tracy A Jaffe, Chad M Miller, Maciej A Mazurowski, Mustafa R Bashir
OBJECTIVE: The purpose of this study is to compare visualization rates of the major features covered by Liver Imaging Reporting and Data System (LI-RADS) version 2014 in patients at risk for hepatocellular carcinoma using either gadobenate dimeglumine or gadoxetate disodium IV contrast agent. MATERIALS AND METHODS: This retrospective study included liver MRI examinations performed with either gadobenate dimeglumine or gadoxetate disodium contrast enhancement. Using age, sex, underlying liver disease, and presence of cirrhosis, patients were placed into matched cohorts...
April 9, 2018: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/29626940/pet-mri-in-infection-and-inflammation
#12
REVIEW
Martina Sollini, Raffaella Berchiolli, Margarita Kirienko, Alexia Rossi, A W J M Glaudemans, Riemer Slart, Paola Anna Erba
Hybrid positron emission tomography/magnetic resonance imaging (PET/MR) systems are now more and more available for clinical use. PET/MR combines the unique features of MR including excellent soft tissue contrast, diffusion-weighted imaging, dynamic contrast-enhanced imaging, fMRI and other specialized sequences as well as MR spectroscopy with the quantitative physiologic information that is provided by PET. Most of the evidence of the potential clinical utility of PET/MRI is available for neuroimaging. Other areas, where PET/MR can play a larger role include head and neck, upper abdominal, and pelvic tumours...
May 2018: Seminars in Nuclear Medicine
https://www.readbyqxmd.com/read/29620604/diffusion-weighted-imaging-with-apparent-diffusion-coefficient-mapping-for-breast-cancer-detection-as-a-stand-alone-parameter-comparison-with-dynamic-contrast-enhanced-and-multiparametric-magnetic-resonance-imaging
#13
Katja Pinker, Linda Moy, Elizabeth J Sutton, Ritse M Mann, Michael Weber, Sunitha B Thakur, Maxine S Jochelson, Zsuzsanna Bago-Horvath, Elizabeth A Morris, Pascal At Baltzer, Thomas H Helbich
PURPOSE: The aims of this study were to compare dynamic contrast-enhanced (DCE) magnetic resonance imaging (MRI) with diffusion-weighted imaging (DWI) with apparent diffusion coefficient mapping as a stand-alone parameter without any other supportive sequence for breast cancer detection and to assess its combination as multiparametric MRI (mpMRI) of the breast. MATERIALS AND METHODS: In this institutional review board-approved single-center study, prospectively acquired data of 106 patients who underwent breast MRI from 12/2010 to 09/2014 for an imaging abnormality (Breast Imaging Reporting and Data System 0, 4/5) were retrospectively analyzed...
April 3, 2018: Investigative Radiology
https://www.readbyqxmd.com/read/29619934/assessing-synovitis-with-conventional-static-and-dynamic-contrast-enhanced-magnetic-resonance-imaging-in-knee-osteoarthritis
#14
Robert Gc Riis
Knee osteoarthritis (KOA) is one of the most common causes of physical disability in the elderly population. With an increasing ageing and obese population, the prevalence of KOA is expected to rise substantially. The needs for a better understanding of the disease and tools that can predict the course of the disease, for example following treatment, are therefore imperative. 

Inflammation has over the last years been recognised as an important factor for both the symptomatology and disease course in KOA...
April 2018: Danish Medical Journal
https://www.readbyqxmd.com/read/29604233/permeability-of-the-blood-brain-barrier-predicts-no-evidence-of-disease-activity-at-two-years-after-natalizumab-or-fingolimod-treatment-in-relapsing-remitting-multiple-sclerosis
#15
Stig P Cramer, Helle J Simonsen, Aravinthan Varatharaj, Ian Galea, Jette L Frederiksen, Henrik B W Larsson
OBJECTIVE: To investigate if blood-brain barrier (BBB) permeability, as measured by dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI), can provide early detection of sub-optimal treatment response in relapsing-remitting multiple sclerosis (RRMS). METHODS: 35 RRMS patients starting on fingolimod or natalizumab, drugs with a common effect of decreasing lymphocyte influx into the CNS, were scanned with DCE-MRI at 3T prior to treatment and at three and six-months post-treatment...
March 31, 2018: Annals of Neurology
https://www.readbyqxmd.com/read/29603833/prospective-comparison-of-pi-rads-version-2-and-qualitative-in-house-categorization-system-in-detection-of-prostate-cancer
#16
Sonia Gaur, Stephanie Harmon, Sherif Mehralivand, Sandra Bednarova, Brian P Calio, Dordaneh Sugano, Abhinav Sidana, Maria J Merino, Peter A Pinto, Bradford J Wood, Joanna H Shih, Peter L Choyke, Baris Turkbey
BACKGROUND: Prostate Imaging-Reporting and Data System v. 2 (PI-RADSv2) provides standardized nomenclature for interpretation of prostate multiparametric MRI (mpMRI). Inclusion of additional features for categorization may provide benefit to stratification of disease. PURPOSE: To prospectively compare PI-RADSv2 to a qualitative in-house system for detecting prostate cancer on mpMRI. STUDY TYPE: Prospective. POPULATION: In all, 338 patients who underwent mpMRI May 2015-May 2016, with subsequent MRI/transrectal ultrasound fusion-guided biopsy...
March 31, 2018: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29594026/magnetic-resonance-imaging-in-active-surveillance-a-modern-approach
#17
REVIEW
Francesco Giganti, Caroline M Moore
In recent years, active surveillance has been increasingly adopted as a conservative management approach to low and sometimes intermediate risk prostate cancer, to avoid or delay treatment until there is evidence of higher risk disease. A number of studies have investigated the role of multiparametric magnetic resonance imaging (mpMRI) in this setting. MpMRI refers to the use of multiple MRI sequences (T2-weighted anatomical and functional imaging which can include diffusion-weighted imaging, dynamic contrast enhanced imaging, spectroscopy)...
February 2018: Translational Andrology and Urology
https://www.readbyqxmd.com/read/29590180/pre-treatment-tumour-perfusion-parameters-and-initial-recist-response-do-not-predict-long-term-survival-outcomes-for-patients-with-head-and-neck-squamous-cell-carcinoma-treated-with-induction-chemotherapy
#18
Natalie M Lowe, Lucy E Kershaw, Jonathan M Bernstein, Stephanie B Withey, Kathleen Mais, Jarrod J Homer, Nicholas J Slevin, Suzanne C Bonington, Bernadette M Carrington, Catharine M West
OBJECTIVES: Previously, we showed that pre-treatment tumour plasma perfusion (Fp) predicts RECIST response to induction chemotherapy (ICT) in locoregionally advanced head and neck squamous cell carcinoma (HNSCC). The aim here was to determine whether the pre-treatment tumour Fp estimate, changes in tumour Fp or RECIST response post 2 cycles of ICT were prognostic for long-term survival outcomes. METHODS: A prospective study enrolled patients with high stage HNSCC treated with docetaxel (T), cisplatin (P) and 5-fluorouracil (F) (ICT) followed by synchronous cisplatin and intensity modulated radiotherapy...
2018: PloS One
https://www.readbyqxmd.com/read/29581761/discrimination-between-malignant-and-benign-mass-like-lesions-from-breast-dynamic-contrast-enhanced-mri-semi-automatic-vs-manual-analysis-of-the-signal-time-intensity-curves
#19
Jiandong Yin, Jiawen Yang, Zejun Jiang
Purpose: To investigate the performance of a new semi-automatic method for analyzing the signal time-intensity curve (TIC) obtained by breast dynamic contrast enhancement (DCE)-MRI. Methods: In the conventional method, a circular region of interest was drawn manually onto the map reflecting the maximum slope of increase (MSI) to delineate the suspicious lesions. The mean TIC was determined subjectively as one of three different wash-out patterns. In the new method, the lesion area was identified semi-automatically...
2018: Journal of Cancer
https://www.readbyqxmd.com/read/29571804/diagnosis-and-staging-of-hepatocellular-carcinoma-hcc-current-guidelines
#20
Carmen Ayuso, Jordi Rimola, Ramón Vilana, Marta Burrel, Anna Darnell, Ángeles García-Criado, Luis Bianchi, Ernest Belmonte, Carla Caparroz, Marta Barrufet, Jordi Bruix, Concepción Brú
One of the key strategies to improve the prognosis of HCC, beside prevention, is to diagnose the tumor in early stages, when the patient is asymptomatic and the liver function is preserved, because in this clinical situation effective therapies with survival benefit can be applied. Imaging techniques are a key tool in the surveillance and diagnosis of HCC. Screening should be based in US every 6 months and non-invasive diagnostic criteria of HCC based on imaging findings on dynamic-MR and/or dynamic-CT have been validated and thus, accepted in clinical guidelines...
April 2018: European Journal of Radiology
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