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DCE MRI

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https://www.readbyqxmd.com/read/29137612/comparison-of-semi-quantitative-and-quantitative-dynamic-contrast-enhanced-mri-evaluations-of-vertebral-marrow-perfusion-in-a-rat-osteoporosis-model
#1
Jingqi Zhu, Zuogang Xiong, Jiulong Zhang, Yuyou Qiu, Ting Hua, Guangyu Tang
BACKGROUND: This study aims to investigate the technical feasibility of semi-quantitative and quantitative dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) in the assessment of longitudinal changes of marrow perfusion in a rat osteoporosis model, using bone mineral density (BMD) measured by micro-computed tomography (micro-CT) and histopathology as the gold standards. METHODS: Fifty rats were randomly assigned to the control group (n=25) and ovariectomy (OVX) group whose bilateral ovaries were excised (n=25)...
November 14, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/29137496/preoperative-quantitative-dynamic-contrast-enhanced-mri-and-diffusion-weighted-imaging-predict-aggressive-disease-in-endometrial-cancer
#2
Kristine E Fasmer, Atle Bjørnerud, Sigmund Ytre-Hauge, Renate Grüner, Ingvild L Tangen, Henrica Mj Werner, Line Bjørge, Øyvind O Salvesen, Jone Trovik, Camilla Krakstad, Ingfrid S Haldorsen
Background Quantitative dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) and diffusion-weighted imaging (DWI) may yield preoperative tumor biomarkers relevant for prognosis and therapy in cancer. Purpose To explore the value of preoperative DCE-MRI and DWI for the prediction of aggressive disease in endometrial cancer patients. Material and Methods Preoperative MRI (1.5-T) from 177 patients were analyzed and imaging parameters reflecting tumor microvasculature (from DCE-MRI) and tumor microstructure (from DWI) were estimated...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/29134673/modified-dixon-based-renal-dynamic-contrast-enhanced-mri-facilitates-automated-registration-and-perfusion-analysis
#3
Anneloes de Boer, Tim Leiner, Eva E Vink, Peter J Blankestijn, Cornelis A T van den Berg
PURPOSE: Renal dynamic contrast-enhanced (DCE) MRI provides information on renal perfusion and filtration. However, clinical implementation is hampered by challenges in postprocessing as a result of misalignment of the kidneys due to respiration. We propose to perform automated image registration using the fat-only images derived from a modified Dixon reconstruction of a dual-echo acquisition because these provide consistent contrast over the dynamic series. METHODS: DCE data of 10 hypertensive patients was used...
November 13, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29134351/3d-t2-weighted-imaging-to-shorten-multiparametric-prostate-mri-protocols
#4
Stephan H Polanec, Mathias Lazar, Georg J Wengert, Hubert Bickel, Claudio Spick, Martin Susani, Shahrokh Shariat, Paola Clauser, Pascal A T Baltzer
OBJECTIVES: To determine whether 3D acquisitions provide equivalent image quality, lesion delineation quality and PI-RADS v2 performance compared to 2D acquisitions in T2-weighted imaging of the prostate at 3 T. METHODS: This IRB-approved, prospective study included 150 consecutive patients (mean age 63.7 years, 35-84 years; mean PSA 7.2 ng/ml, 0.4-31.1 ng/ml). Two uroradiologists (R1, R2) independently rated image quality and lesion delineation quality using a five-point ordinal scale and assigned a PI-RADS score for 2D and 3D T2-weighted image data sets...
November 13, 2017: European Radiology
https://www.readbyqxmd.com/read/29134191/assessing-treatment-response-in-triple-negative-breast-cancer-from-quantitative-image-analysis-in-perfusion-magnetic-resonance-imaging
#5
Imon Banerjee, Sadhika Malladi, Daniela Lee, Adrien Depeursinge, Melinda Telli, Jafi Lipson, Daniel Golden, Daniel L Rubin
Dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) is sensitive but not specific to determining treatment response in early stage triple-negative breast cancer (TNBC) patients. We propose an efficient computerized technique for assessing treatment response, specifically the residual tumor (RT) status and pathological complete response (pCR), in response to neoadjuvant chemotherapy. The proposed approach is based on Riesz wavelet analysis of pharmacokinetic maps derived from noninvasive DCE-MRI scans, obtained before and after treatment...
January 2018: Journal of Medical Imaging
https://www.readbyqxmd.com/read/29133278/imaging-for-the-detection-of-locoregional-recurrences-in-biochemical-progression-after-radical-prostatectomy-a-systematic-review
#6
REVIEW
Kristina Sandgren, Philippe Westerlinck, Joakim H Jonsson, Lennart Blomqvist, Camilla Thellenberg Karlsson, Tufve Nyholm, Piet Dirix
CONTEXT: Local and regional recurrence after radical prostatectomy (RP) can be treated using salvage radiotherapy (SRT). If the recurrence can be delineated on diagnostic imaging, this could allow for increasingly individualized SRT. OBJECTIVE: This systematic review aimed at evaluating the evidence regarding the usefulness of positron emission tomography (PET) and magnetic resonance imaging (MRI) in identifying local and regional recurrences, with the aim to further individualize the SRT treatment...
November 10, 2017: European Urology Focus
https://www.readbyqxmd.com/read/29128994/radiologists-preferences-regarding-content-of-prostate-mri-reports-a-survey-of-the-society-of-abdominal-radiology
#7
Benjamin Spilseth, Daniel J Margolis, Sangeet Ghai, Nayana U Patel, Andrew B Rosenkrantz
PURPOSE: To evaluate radiologist preferences regarding specific content that warrants inclusion in prostate MRI reports. METHODS: Sixty-one members of the Society of Abdominal Radiology responded to a 74-item survey regarding specific content warranted in prostate MRI reports, conducted in August 2016. RESULTS: General items deemed essential report content by ≥ 50% of respondents were prostate volume (80%), extent of prostate hemorrhage (74%), TURP defects (69%), coil type (64%), BPH (61%), contrast dose (61%), contrast agent (59%), medications administered (59%), and magnet strength (54%)...
November 11, 2017: Abdominal Radiology
https://www.readbyqxmd.com/read/29124781/vascular-input-function-correction-of-inflow-enhancement-for-improved-pharmacokinetic-modeling-of-liver-dce-mri
#8
Jia Ning, Tilman Schubert, Kevin M Johnson, Alejandro Roldán-Alzate, Huijun Chen, Chun Yuan, Scott B Reeder
PURPOSE: To propose a simple method to correct vascular input function (VIF) due to inflow effects and to test whether the proposed method can provide more accurate VIFs for improved pharmacokinetic modeling. METHODS: A spoiled gradient echo sequence-based inflow quantification and contrast agent concentration correction method was proposed. Simulations were conducted to illustrate improvement in the accuracy of VIF estimation and pharmacokinetic fitting. Animal studies with dynamic contrast-enhanced MR scans were conducted before, 1 week after, and 2 weeks after portal vein embolization (PVE) was performed in the left portal circulation of pigs...
November 10, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29121960/non-invasive-quantification-of-age-related-changes-in-the-vertebral-endplate-in-rats-using-in-vivo-dce-mri
#9
Hui Li, Jia-Zhi Yan, Yong-Jie Chen, Wei-Bo Kang, Jia-Xi Huang
BACKGROUND: Small animal models that can mimic degenerative disc disease (DDD) are commonly used to examine DDD progression. However, assessments such as histological studies and macroscopic measurements do not allow for longitudinal studies because they can only be completed after the animal is sacrificed. Dynamic contrast-enhanced MRI (DCE-MRI) may provide a reliable, non-invasive in vivo method for detecting the progression. METHODS: The present study investigated the progression of changes in lumbar discs and the effect of endplate conditions on diffusion into the lumbar discs of aging sand rats after intravenous administration of gadolinium-containing contrast medium through the tail vein...
November 9, 2017: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/29121075/functional-evaluation-of-therapeutic-response-of-hcc827-lung-cancer-to-bevacizumab-and-erlotinib-targeted-therapy-using-dynamic-contrast-enhanced-and-diffusion-weighted-mri
#10
Yi-Fang Chen, Ang Yuan, Kuan-Hung Cho, Yi-Chien Lu, Mark Yen-Ping Kuo, Jyh-Horng Chen, Yeun-Chung Chang
This study aimed to investigate the therapeutic responses of lung cancer mice models with adenocarcinoma HCC827 (gefitinib sensitive) and HCC827R (gefitinib resistant) to the epidermal growth factor receptor-tyrosine kinase inhibitor erlotinib alone and in combination with the anti-angiogenesis agent bevacizumab using dynamic contrast enhanced (DCE) and diffusion-weighted MRI. In the HCC827 model, temporal changes in DCE-MRI derived parameters (Ktrans, kep, and iAUC90) and apparent diffusion coefficient (ADC) were significantly correlated with tumor size...
2017: PloS One
https://www.readbyqxmd.com/read/29115690/the-effects-of-intravoxel-contrast-agent-diffusion-on-the-analysis-of-dce-mri-data-in-realistic-tissue-domains
#11
Ryan T Woodall, Stephanie L Barnes, David A Hormuth, Anna G Sorace, C Chad Quarles, Thomas E Yankeelov
PURPOSE: Quantitative evaluation of dynamic contrast enhanced MRI (DCE-MRI) allows for estimating perfusion, vessel permeability, and tissue volume fractions by fitting signal intensity curves to pharmacokinetic models. These compart mental models assume rapid equilibration of contrast agent within each voxel. However, there is increasing evidence that this assumption is violated for small molecular weight gadolinium chelates. To evaluate the error introduced by this invalid assumption, we simulated DCE-MRI experiments with volume fractions computed from entire histological tumor cross-sections obtained from murine studies...
November 8, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29114180/head-and-neck-cancer-tumor-segmentation-using-support-vector-machine-in-dynamic-contrast-enhanced-mri
#12
Wei Deng, Liangping Luo, Xiaoyi Lin, Tianqi Fang, Dexiang Liu, Guo Dan, Hanwei Chen
Objective: We aimed to propose an automatic method based on Support Vector Machine (SVM) and Dynamic Contrast-Enhanced Magnetic Resonance Imaging (DCE-MRI) to segment the tumor lesions of head and neck cancer (HNC). Materials and Methods: 120 DCE-MRI samples were collected. Five curve features and two principal components of the normalized time-intensity curve (TIC) in 80 samples were calculated as the dataset in training three SVM classifiers. The other 40 samples were used as the testing dataset...
2017: Contrast Media & Molecular Imaging
https://www.readbyqxmd.com/read/29114177/associations-between-18-f-fdg-pet-dwi-and-dce-parameters-in-patients-with-head-and-neck-squamous-cell-carcinoma-depend-on-tumor-grading
#13
Leonard Leifels, Sandra Purz, Patrick Stumpp, Stefan Schob, Hans Jonas Meyer, Thomas Kahn, Osama Sabri, Alexey Surov
Our purpose was to analyze associations between positron emission tomography (PET), diffusion weighted imaging (DWI), and dynamic contrast-enhanced (DCE) imaging in patients with head and neck squamous cell carcinoma (HNSCC). The study involved 34 patients (9 women, 25 men, mean age: 56.7 ± 10.2 years). In all patients a simultaneous (18)F-FDG-PET/MR was performed. DWI was obtained by using of an axial EPI sequence. Minimal ADC values (ADCmin), mean ADC values (ADCmean), and maximal ADC values (ADCmax) were estimated...
2017: Contrast Media & Molecular Imaging
https://www.readbyqxmd.com/read/29113660/functional-hepatic-imaging-as-a-biomarker-of-primary-and-secondary-tumor-response-to-loco-regional-therapies
#14
REVIEW
H L Lewis, M A Ghasabeh, P Khoshpouri, I R Kamel, T M Pawlik
Objective criteria to measure tumor response are a key tenet for assessment of treatment efficacy when evaluating a therapeutic modality. Several response criteria have been proposed including the Response Evaluation Criteria in Solid Tumors (RECIST), modified RECIST (mRECIST), RECIST 1-1, and European Association for the Study of the Liver (EASL) guidelines. Response following loco-regional therapies (LRT) can be particularly difficult to assess as post-treatment changes may not always relate to changes in lesion size...
December 2017: Surgical Oncology
https://www.readbyqxmd.com/read/29113174/quantitative-analysis-of-permeability-for-glioma-grading-using-dynamic-contrast-enhanced-magnetic-resonance-imaging
#15
Ming Zhao, Li-Li Guo, Ning Huang, Qiong Wu, Li Zhou, Hui Zhao, Jing Zhang, Kuang Fu
The objective of the present study was to quantitatively analyze the permeability of tumor entity and peritumor edema in glioma grading, using dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI). In the present retrospective study, 80 patients underwent T1-weighted DCE-MRI examination at 3.0 T and the pathological results (including astrocytoma and oligodendroglioma) were obtained between January 2012 and June 2015. All cases were surgically validated as grade I-IV gliomas. The original DCE-MRI data were analyzed using dual compartment modified Tofts model...
November 2017: Oncology Letters
https://www.readbyqxmd.com/read/29112948/using-quantitative-features-extracted-from-t2-weighted-mri-to-improve-breast-mri-computer-aided-diagnosis-cad
#16
Cristina Gallego-Ortiz, Anne L Martel
Computer-aided diagnosis (CAD) has been proposed for breast MRI as a tool to standardize evaluation, to automate time-consuming analysis, and to aid the diagnostic decision process by radiologists. T2w MRI findings are diagnostically complementary to T1w DCE-MRI findings in the breast and prior research showed that measuring the T2w intensity of a lesion relative to a tissue of reference improves diagnostic accuracy. The diagnostic value of this information in CAD has not been yet quantified. This study proposes an automatic method of assessing relative T2w lesion intensity without the need to select a reference region...
2017: PloS One
https://www.readbyqxmd.com/read/29107626/mri-measurements-of-blood-brain-barrier-function-in-dementia-a-review-of-recent-studies
#17
REVIEW
Rajikha Raja, Gary A Rosenberg, Arvind Caprihan
Blood-brain barrier (BBB) separates the systemic circulation and the brain, regulating transport of most molecules to protect the brain microenvironment. Multiple structural and functional components preserve the integrity of the BBB. Several imaging modalities are available to study disruption of the BBB. However, the subtle changes in BBB leakage that occurs in vascular cognitive impairment and Alzheimer's disease have been less well studied. Dynamic contrast enhanced magnetic resonance imaging (DCE-MRI) is the most widely adopted non-invasive imaging technique for evaluating BBB breakdown...
October 28, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/29107458/imaging-facilities-adherence-to-pi-rads-v2-minimum-technical-standards-for-the-performance-of-prostate-mri
#18
Steven J Esses, Samir S Taneja, Andrew B Rosenkrantz
PURPOSE: This study aimed to assess variability in imaging facilities' adherence to the minimum technical standards for prostate magnetic resonance imaging acquisition established by Prostate Imaging-Reporting and Data System (PI-RADS) version 2 (v2). METHODS: A total of 107 prostate magnetic resonance imaging examinations performed at 107 unique imaging facilities after the release of PI-RADS v2 and that were referred to a tertiary care center for secondary interpretation were included...
October 26, 2017: Academic Radiology
https://www.readbyqxmd.com/read/29105486/can-imaging-kinetic-parameters-of-dynamic-contrast-enhanced-magnetic-resonance-imaging-be-valuable-in-predicting-clinicopathological-prognostic-factors-of-invasive-breast-cancer
#19
Cuiyan Wang, Wei Wei, Lumarie Santiago, Gary Whitman, Basak Dogan
Background Intrinsic molecular profiling of breast cancer provides clinically relevant information that helps tailor therapy directed to the specific tumor subtype. We hypothesized that dynamic contrast-enhanced MRI (DCE-MRI) derived quantitative kinetic parameters (CD-QKPs) may help predict molecular tumor profiles non-invasively. Purpose To determine the association between DCE-MRI (CD-QKPs) and breast cancer clinicopathological prognostic factors. Material and Methods Clinicopathological factors in consecutive women with biopsy-confirmed invasive breast cancer who underwent breast DCE-MRI were retrospectively reviewed...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/29100521/dce-mri-of-patient-derived-xenograft-models-of-uterine-cervix-carcinoma-associations-with-parameters-of-the-tumor-microenvironment
#20
Anette Hauge, Catherine S Wegner, Jon-Vidar Gaustad, Trude G Simonsen, Lise Mari K Andersen, Einar K Rofstad
BACKGROUND: Abnormalities in the tumor microenvironment are associated with resistance to treatment, aggressive growth, and poor clinical outcome in patients with advanced cervical cancer. The potential of dynamic contrast-enhanced (DCE) MRI to assess the microvascular density (MVD), interstitial fluid pressure (IFP), and hypoxic fraction of patient-derived cervical cancer xenografts was investigated in the present study. METHODS: Four patient-derived xenograft (PDX) models of squamous cell carcinoma of the uterine cervix (BK-12, ED-15, HL-16, and LA-19) were subjected to Gd-DOTA-based DCE-MRI using a 7...
November 3, 2017: Journal of Translational Medicine
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