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dce perfusion and tumor

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https://www.readbyqxmd.com/read/27888709/correlations-between-dce-mri-and-histopathological-parameters-in-head-and-neck-squamous-cell-carcinoma
#1
Alexey Surov, Hans Jonas Meyer, Matthias Gawlitza, Anne-Kathrin Höhn, Andreas Boehm, Thomas Kahn, Patrick Stumpp
BACKGROUND: Dynamic contrast-enhanced magnetic resonance imaging (DCE MRI) can characterize perfusion and vascularization of tissues. DCE MRI parameters can differentiate between malignant and benign lesions and predict tumor grading. The purpose of this study was to correlate DCE MRI findings and various histopathological parameters in head and neck squamous cell carcinoma (HNSCC). PATIENTS AND METHODS: Sixteen patients with histologically proven HNSCC (11 cases primary tumors and in 5 patients with local tumor recurrence) were included in the study...
November 23, 2016: Translational Oncology
https://www.readbyqxmd.com/read/27875218/entropy-of-ultrasound-contrast-agent-velocity-fields-for-angiogenesis-imaging-in-prostate-cancer
#2
Ruud van Sloun, Libertario Demi, Arnoud Postema, Jean de la Rosette, Hessel Wijkstra, Massimo Mischi
Prostate cancer care can benefit from accurate and cost-efficient imaging modalities that are able to reveal prognostic indicators for cancer. Angiogenesis is known to play a central role in the growth of tumors towards a metastatic or a lethal phenotype.With the aim of localizing angiogenic activity in a noninvasive manner, Dynamic Contrast Enhanced Ultrasound (DCEUS) has been widely used. Usually, the passage of ultrasound contrast agents thought the organ of interest is analyzed for the assessment of tissue perfusion...
November 16, 2016: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/27806585/time-resolved-angiography-with-stochastic-trajectories-for-dynamic-contrast-enhanced-mri-in-head-and-neck-cancer-are-pharmacokinetic-parameters-affected
#3
Rafal Panek, Maria A Schmidt, Marco Borri, Dow-Mu Koh, Angela Riddell, Liam Welsh, Alex Dunlop, Ceri Powell, Shreerang A Bhide, Christopher M Nutting, Kevin J Harrington, Kate L Newbold, Martin O Leach
PURPOSE: To investigate the effects of different time-resolved angiography with stochastic trajectories (TWIST) k-space undersampling schemes on calculated pharmacokinetic dynamic contrast-enhanced (DCE) vascular parameters. METHODS: A digital perfusion phantom was employed to simulate effects of TWIST on characteristics of signal changes in DCE. Furthermore, DCE-MRI was acquired without undersampling in a group of patients with head and neck squamous cell carcinoma and used to simulate a range of TWIST schemes...
November 2016: Medical Physics
https://www.readbyqxmd.com/read/27797110/increased-robustness-in-reference-region-model-analysis-of-dce-mri-using-two-step-constrained-approaches
#4
Zaki Ahmed, Ives R Levesque
PURPOSE: Reference region models (RRMs) can quantify tumor perfusion in dynamic contrast-enhanced MRI without an arterial input function. Inspection of the RRM reveals that one of the free parameters in the fit is uniquely linked to the reference region and is common to all voxels. A two-step approach is proposed that takes this constraint into account. METHODS: Three constrained RRM (CRRM) approaches were devised and evaluated. Simulations were performed to compare their accuracy and precision over a range of noise and temporal resolutions...
October 31, 2016: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/27796446/prognostic-value-of-preoperative-dynamic-contrast-enhanced-mri-perfusion-parameters-for-high-grade-glioma-patients
#5
Agne Ulyte, Vasileios K Katsaros, Evangelia Liouta, Georgios Stranjalis, Christos Boskos, Nickolas Papanikolaou, Jurgita Usinskiene, Sotirios Bisdas
INTRODUCTION: The prognostic value of the dynamic contrast-enhanced (DCE) MRI perfusion and its histogram analysis-derived metrics is not well established for high-grade glioma (HGG) patients. The aim of this prospective study was to investigate DCE perfusion transfer coefficient (K(trans)), vascular plasma volume fraction (vp), extracellular volume fraction (ve), reverse transfer constant (kep), and initial area under gadolinium concentration time curve (IAUGC) as predictors of progression-free (PFS) and overall survival (OS) in HGG patients...
October 29, 2016: Neuroradiology
https://www.readbyqxmd.com/read/27780936/low-dose-angiostatic-treatment-counteracts-radiotherapy-induced-tumor-perfusion-and-enhances-the-anti-tumor-effect
#6
Esther A Kleibeuker, Emmanouil Fokas, Philip D Allen, Veerle Kersemans, Arjan W Griffioen, John Beech, Jaehong H Im, Sean C Smart, Kitty C Castricum, Jaap van den Berg, Iris A Schulkens, Sally A Hill, Adrian L Harris, Ben J Slotman, Henk M Verheul, Ruth J Muschel, Victor L Thijssen
The extent of tumor oxygenation is an important factor contributing to the efficacy of radiation therapy (RTx). Interestingly, several preclinical studies have shown benefit of combining RTx with drugs that inhibit tumor blood vessel growth, i.e. angiostatic therapy. Recent findings show that proper scheduling of both treatment modalities allows dose reduction of angiostatic drugs without affecting therapeutic efficacy. We found that whilst low dose sunitinib (20 mg/kg/day) did not affect the growth of xenograft HT29 colon carcinoma tumors in nude mice, the combination with either single dose RTx (1x 5Gy) or fractionated RTx (5x 2Gy/week, up to 3 weeks) substantially hampered tumor growth compared to either RTx treatment alone...
October 21, 2016: Oncotarget
https://www.readbyqxmd.com/read/27776667/dynamic-contrast-enhanced-case-control-analysis-in-3t-mri-of-prostate-cancer-can-help-to-characterize-tumor-aggressiveness
#7
Roberto Sanz-Requena, Luis Martí-Bonmatí, Rosario Pérez-Martínez, Gracián García-Martí
PURPOSE: The aim of this work is to establish normality and tumor tissue ranges for perfusion parameters from dynamic contrast-enhanced (DCE) MR of the peripheral prostate at 3T and to compare the diagnostic performance of quantitative and semi-quantitative parameters. MATERIALS AND METHODS: Thirty-six patients with prostate carcinomas (18 Gleason-6, 15 Gleason-7, and 3 Gleason-8) and 33 healthy subjects were included. Image analysis workflow comprised four steps: manual segmentation of whole prostate and lesions, series registration, voxelwise T1 mapping and calculation of pharmacokinetic and semi-quantitative parameters...
November 2016: European Journal of Radiology
https://www.readbyqxmd.com/read/27762331/dce-mri-perfusion-and-permeability-parameters-as-predictors-of-tumor-response-to-ccrt-in-patients-with-locally-advanced-nsclc
#8
Xiuli Tao, Lvhua Wang, Zhouguang Hui, Li Liu, Feng Ye, Ying Song, Yu Tang, Yu Men, Tryphon Lambrou, Zihua Su, Xiao Xu, Han Ouyang, Ning Wu
In this prospective study, 36 patients with stage III non-small cell lung cancers (NSCLC), who underwent dynamic contrast-enhanced MRI (DCE-MRI) before concurrent chemo-radiotherapy (CCRT) were enrolled. Pharmacokinetic analysis was carried out after non-rigid motion registration. The perfusion parameters [including Blood Flow (BF), Blood Volume (BV), Mean Transit Time (MTT)] and permeability parameters [including endothelial transfer constant (K(trans)), reflux rate (Kep), fractional extravascular extracellular space volume (Ve), fractional plasma volume (Vp)] were calculated, and their relationship with tumor regression was evaluated...
October 20, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27742432/correlation-study-between-intravoxel-incoherent-motion-mri-and-dynamic-contrast-enhanced-mri-in-head-and-neck-squamous-cell-carcinoma-evaluation-in-primary-tumors-and-metastatic-nodes
#9
Simona Marzi, Francesca Piludu, Chiara Forina, Giuseppe Sanguineti, Renato Covello, Giuseppe Spriano, Antonello Vidiri
OBJECTIVE: To correlate intravoxel incoherent motion (IVIM) imaging and dynamic contrast-enhanced (DCE) MRI in head and neck squamous cell carcinoma (HNSCC). METHODS: Forty untreated patients with HNSCC were included retrospectively in the study. Perfusion fraction f, diffusion coefficient D and perfusion-related diffusion coefficient D* were extracted by bi-exponential fitting of IVIM data. Semi-quantitative DCE-MRI parameters, including positive enhancement integral (PEI) and maximum slope of increase (MSI), were calculated...
October 11, 2016: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/27731907/brain-capillary-transit-time-heterogeneity-in-healthy-volunteers-measured-by-dynamic-contrast-enhanced-t1-weighted-perfusion-mri
#10
Henrik B W Larsson, Mark B Vestergaard, Ulrich Lindberg, Helle K Iversen, Stig P Cramer
PURPOSE: Capillary transit time heterogeneity, measured as CTH, may set the upper limit for extraction of substances in brain tissue, e.g., oxygen. The purpose of this study was to investigate the feasibility of dynamic contrast-enhanced T1 weighted MRI (DCE-MRI) at 3 Tesla (T), in estimating CTH based on a gamma-variate model of the capillary transit time distribution. In addition, we wanted to investigate if a subtle increase of the blood-brain barrier permeability can be incorporated into the model, still allowing estimation of CTH...
October 12, 2016: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/27694709/a-novel-anthropomorphic-flow-phantom-for-the-quantitative-evaluation-of-prostate-dce-mri-acquisition-techniques
#11
Silvin P Knight, Jacinta E Browne, James F Meaney, David S Smith, Andrew J Fagan
A novel anthropomorphic flow phantom device has been developed, which can be used for quantitatively assessing the ability of magnetic resonance imaging (MRI) scanners to accurately measure signal/concentration time-intensity curves (CTCs) associated with dynamic contrast-enhanced (DCE) MRI. Modelling of the complex pharmacokinetics of contrast agents as they perfuse through the tumour capillary network has shown great promise for cancer diagnosis and therapy monitoring. However, clinical adoption has been hindered by methodological problems, resulting in a lack of consensus regarding the most appropriate acquisition and modelling methodology to use and a consequent wide discrepancy in published data...
October 3, 2016: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/27685105/characteristics-of-quantitative-perfusion-parameters-on-dynamic-contrast-enhanced-mri-in-mammographically-occult-breast-cancer
#12
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 per-fusion 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 prog-nostic 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...
2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/27632532/dce-mri-derived-parameters-in-evaluating-abraxane-induced-early-vascular-response-and-the-effectiveness-of-its-synergistic-interaction-with-cisplatin
#13
Xilin Sun, Lili Yang, Xuefeng Yan, Yingying Sun, Dongliang Zhao, Yang Ji, Kai Wang, Xiaoyuan Chen, Baozhong Shen
Our previous studies revealed molecular alterations of tumor vessels, varying from immature to mature alterations, resulting from Abraxane, and demonstrated that the integrin-specific PET tracer 18F-FPPRGD2 can be used to noninvasively monitor such changes. However, changes in the tumor vasculature at functional levels such as perfusion and permeability are also important for monitoring Abraxane treatment outcomes in patients with cancer. The purpose of this study is to further investigate the vascular response during Abraxane therapy and the effectiveness of its synergistic interaction with cisplatin using Dynamic contrast enhanced-magnetic resonance imaging (DCE-MRI)...
2016: PloS One
https://www.readbyqxmd.com/read/27608045/dynamic-contrast-enhanced-ct-in-patients-with-pancreatic-cancer
#14
REVIEW
Rie Ø Eriksen, Louise S Strauch, Michael Sandgaard, Thomas S Kristensen, Michael B Nielsen, Carsten A Lauridsen
The aim of this systematic review is to provide an overview of the use of Dynamic Contrast-enhanced Computed Tomography (DCE-CT) in patients with pancreatic cancer. This study was composed according to the PRISMA guidelines 2009. The literature search was conducted in PubMed, Cochrane Library, EMBASE, and Web of Science databases to identify all relevant publications. The QUADAS-2 tool was implemented to assess the risk of bias and applicability concerns of each included study. The initial literature search yielded 483 publications...
September 6, 2016: Diagnostics
https://www.readbyqxmd.com/read/27601143/changes-in-hepatic-perfusion-assessed-by-dynamic-contrast-enhanced-mri-associated-with-morphologic-evaluation-in-patients-with-liver-metastases-from-colorectal-cancer-treated-with-first-line-chemotherapy
#15
Marco Tampellini, Dario Gned, Chiara Baratelli, Maria Pia Brizzi, Azzurra Ottone, Irene Alabiso, Chiara Bertaggia, Massimo Di Maio, Giorgio Vittorio Scagliotti, Andrea Veltri
INTRODUCTION: Blood perfusion of liver metastases can be non-invasively assessed by dynamic contrast enhanced magnetic resonance imaging (DCE-MRI). The aim of this study was to explore whether the ratio of hepatic arterial to total liver blood flow (Hepatic Perfusion Index-HPI) and the area under the enhancement curve (AUC) of selected liver areas in patients with hepatic metastases from colorectal cancer treated with first-line chemotherapy could predict response and/or be a prognostic variable...
September 6, 2016: La Radiologia Medica
https://www.readbyqxmd.com/read/27587952/intravoxel-incoherent-motion-mr-imaging-in-the-head-and-neck-correlation-with-dynamic-contrast-enhanced-mr-imaging-and-diffusion-weighted-imaging
#16
Xiao Quan Xu, Young Jun Choi, Yu Sub Sung, Ra Gyoung Yoon, Seung Won Jang, Ji Eun Park, Young Jin Heo, Jung Hwan Baek, Jeong Hyun Lee
OBJECTIVE: To investigate the correlation between perfusion- and diffusion-related parameters from intravoxel incoherent motion (IVIM) and those from dynamic contrast-enhanced MR imaging (DCE-MRI) and diffusion-weighted imaging in tumors and normal muscles of the head and neck. MATERIALS AND METHODS: We retrospectively enrolled 20 consecutive patients with head and neck tumors with MR imaging performed using a 3T MR scanner. Tissue diffusivity (D), pseudo-diffusion coefficient (D(*)), and perfusion fraction (f) were derived from bi-exponential fitting of IVIM data obtained with 14 different b-values in three orthogonal directions...
September 2016: Korean Journal of Radiology: Official Journal of the Korean Radiological Society
https://www.readbyqxmd.com/read/27587228/early-responses-assessment-of-neoadjuvant-chemotherapy-in-nasopharyngeal-carcinoma-by-serial-dynamic-contrast-enhanced-mr-imaging
#17
Dechun Zheng, Qiuyuan Yue, Wang Ren, Meng Liu, Xiaoxiao Zhang, Hao Lin, Guojing Lai, Weibo Chen, Queenie Chan, Yunbin Chen
PURPOSE: To evaluate the feasibility of utilizing serial dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) prospectively for early prediction of neoadjuvant chemotherapy (NAC) response in nasopharyngeal carcinoma (NPC) patients. MATERIALS AND METHODS: Sixty-three advanced NPC patients were recruited and received three DCE-MRI exams before treatment (Pre-Tx), 3days (Day3-Tx) and 20days (Day20-Tx) after initiation of chemotherapy (one NAC cycle). Early response to NAC was determined based on the third MRI scan and classified partial response (PR) as responders and stable disease (SD) as non-responders...
August 29, 2016: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/27583578/spatial-measurements-of-perfusion-interstitial-fluid-pressure-and-liposomes-accumulation-in-solid-tumors
#18
Shawn Stapleton, Daniel Mirmilshteyn, Jinzi Zheng, Christine Allen, David A Jaffray
The heterogeneous intra-tumoral accumulation of liposomes is a critical determinant of their efficacy. Both the chaotic tumor microcirculation and elevated IFP are linked to the heterogeneous intra-tumoral distribution of nanotechnology-based drug delivery systems such as liposomes. In the present study, the relationship between tumor microcirculation, elevated IFP, and accumulation of nanoparticles was investigated through in vivo experimentation. This was accomplished by evaluation of the tumor microcirculation using dynamic contrast enhanced computed tomography (DCE-CT) and measurement of tumor IFP using a novel image-guided robotic needle placement system connected to the micro-CT scanner...
2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27577069/phase-ib-ii-randomized-open-label-study-of-doxorubicin-and-cyclophosphamide-with-or-without-low-dose-short-course-sunitinib-in-the-pre-operative-treatment-of-breast-cancer
#19
Andrea L A Wong, Raghav Sundar, Ting-Ting Wang, Thian-C Ng, Bo Zhang, Sing-Huang Tan, Thomas I P Soh, Angela S L Pang, Chee-Seng Tan, Samuel G W Ow, Lingzhi Wang, Jannet Mogro, Jingshan Ho, Anand D Jeyasekharan, Yiqing Huang, Choon-Hua Thng, Ching-Wan Chan, Mikael Hartman, Philip Iau, Shaik A Buhari, Boon-Cher Goh, Soo-Chin Lee
BACKGROUND: Prolonged anti-angiogenic therapy destroys tumor vasculature, whereas vascular-normalizing doses may enhance intra-tumoral drug delivery. We hypothesize that low-dose, short-course sunitinib normalizes vasculature, enhancing chemotherapy efficacy. PATIENTS AND METHODS: In phase Ib, treatment-naïve breast cancer patients received four cycles of pre-operative doxorubicin/cyclophosphamide, with sunitinib before each cycle. The optimal dose of sunitinib leading to tumor vessel normalization on immunohistochemistry was identified...
August 25, 2016: Oncotarget
https://www.readbyqxmd.com/read/27576699/demonstration-of-dce-mri-as-an-early-pharmacodynamic-biomarker-of-response-to-vegf-trap-in-glioblastoma
#20
Allison F O'Neill, Lei Qin, Patrick Y Wen, John F de Groot, Annick D Van den Abbeele, Jeffrey T Yap
Glioblastoma (GBM) is an incurable brain tumor characterized by the expression of pro-angiogenic cytokines. A recent phase II clinical trial studied VEGF Trap in adult patients with temozolomide-resistant GBM. We sought to explore changes in [(18)F]Fluorodeoxyglucose positron emission tomography (FDG-PET) or magnetic resonance imaging (MRI) in trial participants correlating these changes with disease response. FDG-PET and MRI images obtained before and after the first dose of VEGF Trap were spatially co-registered...
August 30, 2016: Journal of Neuro-oncology
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