keyword
MENU ▼
Read by QxMD icon Read
search

Dynamic contrasted enhance MRI

keyword
https://www.readbyqxmd.com/read/28331741/pet-mri-findings-of-two-patients-with-breast-carcinoma-before-treatment
#1
Filiz Çelebi, Ülkühan Köksal, Kezban Nur Pilancı, Çetin Ordu, Dauren Sarsenov, Serkan İlgün, Fatmagül Kuşku Çabuk, Gül Alço, Güzide Özdil, Zeynep Erdoğan, Vahit Özmen
Integrated positron-emission tomography-magnetic resonance imaging (PET-MRI) is a new hybrid simultaneous imaging modality with higher soft tissue contrast and lower radiation doses compared with PET-CT. Two patients who were referred to our hospital with left breast masses that were pathologically diagnosed as invasive ductal carcinoma. The women were then scanned using the first PET-MRI system in Turkey, which was established in our department. In this case report, we aimed to determine the advantages of PET-MRI in staging, follow-up, neoadjuvant chemotherapy response, and to compare the usefulness of this modality with PET-CT and dynamic contrast-enhanced breast MRI...
April 2016: J Breast Health (2013)
https://www.readbyqxmd.com/read/28330415/novel-detection-of-placental-insufficiency-by-magnetic-resonance-imaging-in-the-nonhuman-primate
#2
Jamie O Lo, Victoria H J Roberts, Matthias C Schabel, Xiaojie Wang, Terry K Morgan, Zheng Liu, Colin Studholme, Christopher D Kroenke, Antonio E Frias
The placenta is a vital organ necessary for healthy fetal development. Placental insufficiency creates an in utero environment where the fetus is at risk of insufficient oxygen or nutrient exchange. This is primarily caused by impairment of either maternal or fetal circulation or vascular thrombosis such as placental infarction. As a result of placental dysfunction, affected fetuses may be growth restricted, neurologically impaired, and at risk of increased morbidity and mortality. In a cohort of 4 pregnant Rhesus macaques, we describe antenatal detection of naturally occurring intrauterine growth restriction (IUGR) and aberrant fetal neurodevelopment in 1 animal...
January 1, 2017: Reproductive Sciences
https://www.readbyqxmd.com/read/28325514/multiparametric-approach-with-diffusion-weighted-imaging-and-dynamic-contrast-enhanced-mri-a-comparison-study-for-differentiating-between-benign-and-malignant-bone-lesions-in-adults
#3
E Oh, Y C Yoon, J H Kim, K Kim
AIM: To evaluate and compare the diagnostic performance of quantitative parameters derived from diffusion-weighted imaging (DWI) and dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) in differentiating benign and malignant bone tumours. MATERIALS AND METHODS: Fifty-five patients (age range, 21-82 years; mean age, 55 years) underwent pretreatment MRI. Apparent diffusion coefficient (ADC) values were calculated by DWI. The DCE-MRI data were analysed for the volume transfer constant (K(trans)), extravascular extracellular volume fraction (Ve), and volume rate constant (Kep), and K(trans)/ADC ratio...
March 18, 2017: Clinical Radiology
https://www.readbyqxmd.com/read/28323163/cerebrospinal-and-interstitial-fluid-transport-via-the-glymphatic-pathway-modeled-by-optimal-mass-transport
#4
Vadim Ratner, Yi Gao, Hedok Lee, Rena Elkin, Maiken Nedergaard, Helene Benveniste, Allen Tannenbaum
The glymphatic pathway is a system which facilitates continuous cerebrospinal fluid (CSF) and interstitial fluid (ISF) exchange and plays a key role in removing waste products from the rodent brain. Dysfunction of the glymphatic pathway may be implicated in the pathophysiology of Alzheimer's disease. Intriguingly, the glymphatic system is most active during deep wave sleep general anesthesia. By using paramagnetic tracers administered into CSF of rodents, we previously showed the utility of MRI in characterizing a macroscopic whole brain view of glymphatic transport but we have yet to define and visualize the specific flow patterns...
March 16, 2017: NeuroImage
https://www.readbyqxmd.com/read/28322902/negative-multi-parametric-mri-of-the-prostate-predicts-absence-of-clinically-significant-prostate-cancer-on-12-core-template-prostate-biopsy
#5
Amanda J Lu, Jamil S Syed, Kevin A Nguyen, Cayce B Nawaf, James Rosoff, Michael Spektor, Angelique Levi, Peter A Humphrey, Jeffrey C Weinreb, Peter G Schulam, Preston C Sprenkle
OBJECTIVE: To determine the negative predictive value of multiparametric-MRI (mpMRI), we evaluated the frequency of prostate cancer detection by 12-core template mapping biopsy in men whose mpMRI showed no suspicious regions. METHODS: 670 patients underwent mpMRI followed by transrectal ultrasound-(TRUS) guided systematic prostate biopsy from December 2012 to June 2016. Of this cohort, 100 patients had a negative mpMRI. mpMRI imaging sequences included T2-weighted, diffusion-weighted imaging, and dynamic contrast enhancement sequences...
March 16, 2017: Urology
https://www.readbyqxmd.com/read/28317128/comparison-of-dce-mri-kinetic-parameters-and-fmiso-pet-uptake-parameters-in-head-and-neck-cancer-patients
#6
Urban Simoncic, Sara Leibfarth, Stefan Welz, Nina Schwenzer, Holger Schmidt, Gerald Reischl, Christina Pfannenberg, Christian la Fougère, Konstantin Nikolaou, Daniel Zips, Daniela Thorwarth
PURPOSE: Tumour hypoxia is a major cause of radiation resistance, often present in various solid tumours. Dynamic [(18) F]-fluoromisonidazole (FMISO) PET imaging is able to reliably assess tumour hypoxia. Comprehensive characterization of tumour microenvironment through FMISO-PET and dynamic contrast enhanced (DCE) MR multimodality imaging might be a valuable alternative to the dynamic FMISO-PET acquisition. The aim of this work was to explore the correlation between the FMISO-PET and DCE-MRI kinetic parameters...
March 20, 2017: Medical Physics
https://www.readbyqxmd.com/read/28314789/non-invasive-imaging-of-cycling-hypoxia-in-head-neck-cancer-using-intrinsic-susceptibility-mri
#7
Rafal Panek, Liam Welsh, Lauren Cj Baker, Maria A Schmidt, Kee H Wong, Angela Riddell, Dow-Mu Koh, Alex Dunlop, Dualta Mcquaid, James A d'Arcy, Shreerang Bhide, Kevin J Harrington, Christopher M Nutting, Georgina Hopkinson, Cheryl Richardson, Carol Box, Suzanne A Eccles, Martin O Leach, Simon P Robinson, Katie L Newbold
PURPOSE: To evaluate intrinsic susceptibility (IS) MRI for the identification of cycling hypoxia, and the assessment of its extent and spatial distribution, in head and neck squamous cell carcinoma (HNSCC) xenografts and patients. EXPERIMENTAL DESIGN: Quantitation of the transverse relaxation rate R2*, which is sensitive to paramagnetic deoxyhemoglobin, using serial IS-MRI acquisitions, was used to monitor temporal oscillations in levels of paramagnetic deoxyhemoglobin in human CAL(R) xenografts and patients with HNSCC at 3T...
March 17, 2017: Clinical Cancer Research: An Official Journal of the American Association for Cancer Research
https://www.readbyqxmd.com/read/28306402/the-effect-of-radiation-dose-on-the-onset-and-progression-of-radiation-induced-brain-necrosis-in-the-rat-model
#8
Brad A Hartl, Htet S W Ma, Katherine S Hansen, Julian Perks, Michael S Kent, Ruben C Fragoso, Laura Marcu
PURPOSE: To provide a comprehensive understanding of how the selection of radiation dose affects the temporal and spatial progression of radiation-induced necrosis in the rat model. MATERIALS AND METHODS: Necrosis was induced with a single fraction of radiation exposure, at doses ranging between 20 and 60 Gy, to the right hemisphere of 8-week-old Fischer rats from a linear accelerator. The development and progression of necrosis in the rats was monitored and quantified every other week with T1- and T2-weighted gadolinium contrast-enhanced MRI studies...
March 17, 2017: International Journal of Radiation Biology
https://www.readbyqxmd.com/read/28303695/dynamic-contrast-enhanced-mri-perfusion-for-differentiating-between-melanoma-and-lung-cancer-brain-metastases
#9
Vaios Hatzoglou, Jamie Tisnado, Alpesh Mehta, Kyung K Peck, Mariza Daras, Antonio M Omuro, Kathryn Beal, Andrei I Holodny
Brain metastases originating from different primary sites overlap in appearance and are difficult to differentiate with conventional MRI. Dynamic contrast-enhanced (DCE)-MRI can assess tumor microvasculature and has demonstrated utility in characterizing primary brain tumors. Our aim was to evaluate the performance of plasma volume (Vp) and volume transfer coefficient (K(trans) ) derived from DCE-MRI in distinguishing between melanoma and nonsmall cell lung cancer (NSCLC) brain metastases. Forty-seven NSCLC and 23 melanoma brain metastases were retrospectively assessed with DCE-MRI...
March 17, 2017: Cancer Medicine
https://www.readbyqxmd.com/read/28303489/in-vivo-dce-mri-for-the-discrimination-between-glioblastoma-and-radiation-necrosis-in-rats
#10
Julie Bolcaen, Benedicte Descamps, Marjan Acou, Karel Deblaere, Caroline Van den Broecke, Tom Boterberg, Christian Vanhove, Ingeborg Goethals
PURPOSE: In this study, the potential of semiquantitative and quantitative analysis of dynamic contrast-enhanced (DCE) magnetic resonance imaging (MRI) was investigated to differentiate glioblastoma (GB) from radiation necrosis (RN) in rats. PROCEDURES: F98 GB growth was seen on MRI 8-23 days post-inoculation (n = 15). RN lesions developed 6-8 months post-irradiation (n = 10). DCE-MRI was acquired using a fast low-angle shot (FLASH) sequence. Regions of interest (ROIs) encompassed peripheral contrast enhancement in GB (n = 15) and RN (n = 10) as well as central necrosis within these lesions (GB (n = 4), RN (n = 3))...
March 16, 2017: Molecular Imaging and Biology: MIB: the Official Publication of the Academy of Molecular Imaging
https://www.readbyqxmd.com/read/28299943/the-value-of-combining-conventional-diffusion-weighted-and-dynamic-contrast-enhanced-mr-imaging-for-the-diagnosis-of-parotid-gland-tumors
#11
Xiaofeng Tao, Gongxin Yang, Pingzhong Wang, Yingwei Wu, Wenjing Zhu, Huimin Shi, Xin Gong, Weiqing Gao, Qiang Yu
OBJECTIVE: The aim of this study was to determine the value of combining conventional MRI, diffusion-weighted (DWI) and dynamic contrast enhanced MRI (DCE-MRI) in diagnosing solid neoplasms in the parotid gland. METHODS: A total of 148 subjects (101 with benign and 47 with malignant tumors) were evaluated with conventional MRI, DWI and DCE-MRI prior to surgery and pathologic verification. The items observed with conventional MRI included the shape, capsule and signal intensity of parotid masses...
March 16, 2017: Dento Maxillo Facial Radiology
https://www.readbyqxmd.com/read/28297442/correlation-of-quantitative-dynamic-contrast-enhanced-mri-with-microvascular-density-in-necrotic-partial-necrotic-and-viable-liver-tumors-in-a-rabbit-model
#12
Jungwon Moon, Jae-Hun Kim, Dongil Choi, Jehoon Yang, Min Woo Lee, Yoon-La Choi, Hyunchul Rhim Md
The purpose of this study was to examine the correlation of quantitative dynamic contrast-enhanced (DCE) magnetic resonance imaging (MRI) with microvessel density (MVD) in necrotic, partial necrotic, and viable tumors using a rabbit VX2 liver tumor model. Nine rabbits were used for this study. The complete necrotic area (CNA), partial necrotic area (PNA), and viable tumor area (VTA) of liver tumors were experimentally induced by radiofrequency ablation (RFA). DCE-MRI data were processed based on the extended Kety model to estimate Ktrans,ve and vp parameters...
September 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28297421/characteristics-of-quantitative-perfusion-parameters-on-dynamic-contrast-enhanced-mri-in-mammographically-occult-breast-cancer
#13
Jung Kyu Ryu, Sun Jung Rhee, Jeong Yoon Song, Soo Hyun Cho, Geon-Ho Jahng
The purpose of this study was to compare the characteristics of quantitative perfusion parameters obtained from dynamic contrast-enhanced (DCE) magnetic resonance imaging (MRI) in patients with mammographically occult (MO) breast cancers and those with mammographically visible (MV) breast cancers. Quantitative parameters (AUC, Ktrans,kep,ve,vp, and wi) from 13 MO breast cancers and 16 MV breast cancers were mapped after the DCE-MRI data were acquired. Various prognostic factors, including axillary nodal status, estrogen receptor (ER), progesterone receptor (PR), Ki-67, p53, E-cadherin, and human epidermal growth factor receptor 2 (HER2) were obtained in each group...
September 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/28295791/value-of-breast-mri-for-patients-with-a-biopsy-showing-atypical-ductal-hyperplasia-adh
#14
Keiko Tsuchiya, Naoko Mori, David V Schacht, Deepa Sheth, Gregory S Karczmar, Gillian M Newstead, Hiroyuki Abe
PURPOSE: To evaluate the diagnostic value of dynamic contrast-enhanced (DCE) magnetic resonance imaging (MRI) for patients with atypical ductal hyperplasia (ADH) in predicting malignant upgrade. MATERIALS AND METHODS: 3T DCE-MRI was performed for 17 patients with ADH (median age 52, range 42-76) proven by stereotactic biopsy (n = 15), and ultrasound-guided biopsy (n = 2) from January 2011 to April 2015. All patients underwent surgical excision after the MRI...
March 10, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28289855/whole-body-mri-dynamic-contrast-enhanced-mri-and-diffusion-weighted-imaging-for-the-staging-of-multiple-myeloma
#15
REVIEW
Julie C Dutoit, Koenraad L Verstraete
Magnetic resonance imaging (MRI) is the most sensitive imaging technique for the detection of bone marrow infiltration, and has therefore recently been included in the new diagnostic myeloma criteria, as proposed by the International Myeloma Working Group. Nevertheless, conventional MRI only provides anatomical information and is therefore only of limited use in the response assessment of patients with multiple myeloma. The additional information from functional MRI techniques, such as diffusion-weighted imaging and dynamic contrast-enhanced MRI, can improve the detection rate of bone marrow infiltration and the assessment of response...
March 13, 2017: Skeletal Radiology
https://www.readbyqxmd.com/read/28286063/motion-corrected-dwi-with-integrated-t2-mapping-for-simultaneous-estimation-of-adc-t2-relaxation-and-perfusion-in-prostate-cancer
#16
M Skorpil, P Brynolfsson, M Engström
OBJECTIVE: Multiparametric magnetic resonance imaging (MRI) and PI-RADS (Prostate Imaging - Reporting and Data System) has become the standard to determine a probability score for a lesion being a clinically significant prostate cancer. T2-weighted and diffusion-weighted imaging (DWI) are essential in PI-RADS, depending partly on visual assessment of signal intensity, while dynamic-contrast enhanced imaging is less important. To decrease inter-rater variability and further standardize image evaluation, complementary objective measures are in need...
March 9, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/28282379/tensor-based-multichannel-reconstruction-for-breast-tumours-identification-from-dce-mris
#17
X-X Yin, S Hadjiloucas, J-H Chen, Y Zhang, J-L Wu, M-Y Su
A new methodology based on tensor algebra that uses a higher order singular value decomposition to perform three-dimensional voxel reconstruction from a series of temporal images obtained using dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) is proposed. Principal component analysis (PCA) is used to robustly extract the spatial and temporal image features and simultaneously de-noise the datasets. Tumour segmentation on enhanced scaled (ES) images performed using a fuzzy C-means (FCM) cluster algorithm is compared with that achieved using the proposed tensorial framework...
2017: PloS One
https://www.readbyqxmd.com/read/28280455/increasing-of-blood-brain-tumor-barrier-permeability-through-transcellular-and-paracellular-pathways-by-microbubble-enhanced-diagnostic-ultrasound-in-a-c6-glioma-model
#18
Jinlong Zhang, Heng Liu, Xuesong Du, Yu Guo, Xiao Chen, Shunan Wang, Jingqin Fang, Peng Cao, Bo Zhang, Zheng Liu, Weiguo Zhang
Most of the anticancer agents cannot be efficiently delivered into the brain tumor because of the existence of blood-brain tumor barrier (BTB). The objective of this study was to explore the effect of microbubble-enhanced diagnostic ultrasound (MEUS) on the BTB permeability and the possible mechanism. Glioma-bearing rats were randomized into three groups as follows: the microbubble-enhanced continued diagnostic ultrasound (MECUS) group; the microbubble-enhanced intermittent diagnostic ultrasound (MEIUS) group and the control group...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28269607/a-dce-mri-imaging-based-model-for-simulation-of-vascular-tumour-growth
#19
Thais Roque, Veerle Kersemans, Sean Smart, Danny Allen, Julia A Schnabel, Michael Chappell
Imaging-based modelling of tumour growth can serve as a powerful tool to understand and predict tumour evolution and its response to therapy. The purpose of this study was to introduce, calibrate and evaluate a multi-scale model of vascular tumour growth. The model allows for proliferation, death and spatial spread of tumour cells as well as for new vessel creation. Both the calibration and the evaluation of the tumour growth model were performed using pre-clinical longitudinal time series of dynamic contrast-enhanced magnetic resonance imaging of colon carcinoma...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28267555/time-to-enhancement-derived-from-ultrafast-breast-mri-as-a-novel-parameter-to-discriminate-benign-from-malignant-breast-lesions
#20
Roel D Mus, Cristina Borelli, Peter Bult, Elisabeth Weiland, Nico Karssemeijer, Jelle O Barentsz, Albert Gubern-Mérida, Bram Platel, Ritse M Mann
OBJECTIVES: To investigate time to enhancement (TTE) as novel dynamic parameter for lesion classification in breast magnetic resonance imaging (MRI). METHODS: In this retrospective study, 157 women with 195 enhancing abnormalities (99 malignant and 96 benign) were included. All patients underwent a bi-temporal MRI protocol that included ultrafast time-resolved angiography with stochastic trajectory (TWIST) acquisitions (1.0×0.9×2.5mm, temporal resolution 4.32s), during the inflow of contrast agent...
April 2017: European Journal of Radiology
keyword
keyword
119696
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"