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dce perfusion and tumor

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https://www.readbyqxmd.com/read/28427220/multiparametric-imaging-using-18f-fdg-pet-ct-heterogeneity-parameters-and-functional-mri-techniques-prognostic-significance-in-patients-with-primary-advanced-oropharyngeal-or-hypopharyngeal-squamous-cell-carcinoma-treated-with-chemoradiotherapy
#1
Sheng-Chieh Chan, Nai-Ming Cheng, Chia-Hsun Hsieh, Shu-Hang Ng, Chien-Yu Lin, Tzu-Chen Yen, Cheng-Lung Hsu, Hung-Ming Wan, Chun-Ta Liao, Kai-Ping Chang, Jiun-Jie Wang
BACKGROUND: In this study, PET heterogeneity was combined with functional MRI techniques to refine the prediction of prognosis in patients with oropharyngeal or hypopharyngeal squamous cell carcinoma (OHSCC). METHODS: A total of 124 patients with primary advanced OHSCC who underwent pretreatment 18F-FDG PET/CT, dynamic contrast-enhanced MR imaging (DCE-MRI), and diffusion-weighted MR imaging (DWI) were enrolled. Conventional and heterogeneity parameters from 18F-FDG PET as well as perfusion parameters from DCE-MRI and diffusion parameter from DWI of primary tumors were analyzed in relation to recurrence-free survival (RFS) and overall survival (OS)...
March 4, 2017: Oncotarget
https://www.readbyqxmd.com/read/28415581/tumor-physiological-changes-during-hypofractionated-stereotactic-body-radiation-therapy-assessed-using-multi-parametric-magnetic-resonance-imaging
#2
Heling Zhou, Zhang Zhang, Rebecca Denney, Jessica S Williams, Jeni Gerberich, Strahinja Stojadinovic, Debabrata Saha, John M Shelton, Ralph P Mason
Radiation therapy is a primary treatment for non-resectable lung cancer and hypoxia is thought to influence tumor response. Hypoxia is expected to be particularly relevant to the evolving new radiation treatment scheme of hypofractionated stereotactic body radiation therapy (SBRT). As such, we sought to develop non-invasive tools to assess tumor pathophysiology and response to irradiation. We applied blood oxygen level dependent (BOLD) and tissue oxygen level dependent (TOLD) MRI, together with dynamic contrast enhanced (DCE) MRI to explore the longitudinal effects of SBRT on tumor oxygenation and vascular perfusion using A549 human lung cancer xenografts in a subcutaneous rat model...
March 21, 2017: Oncotarget
https://www.readbyqxmd.com/read/28402267/contrast-enhanced-ultrasound-evaluation-of-pancreatic-cancer-xenografts-in-nude-mice-after-irradiation-with-sub-threshold-focused-ultrasound-for-tumor-ablation
#3
Yi Hui Gao, Lei Wu, Rui Wang, Qian Guo, Yi Ni Chen, Bing Hu, Li Xin Jiang
We evaluated the efficacy of contrast-enhanced ultrasound for assessing tumors after irradiation with sub-threshold focused ultrasound (FUS) ablation in pancreatic cancer xenografts in nude mice. Thirty tumor-bearing nude mice were divided into three groups: Group A received sham irradiation, Group B received a moderate-acoustic energy dose (sub-threshold), and Group C received a high-acoustic energy dose. In Group B, B-mode ultrasound (US), color Doppler US, and dynamic contrast-enhanced ultrasound (DCE-US) studies were conducted before and after irradiation...
March 28, 2017: Oncotarget
https://www.readbyqxmd.com/read/28314789/non-invasive-imaging-of-cycling-hypoxia-in-head-neck-cancer-using-intrinsic-susceptibility-mri
#4
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/28303695/dynamic-contrast-enhanced-mri-perfusion-for-differentiating-between-melanoma-and-lung-cancer-brain-metastases
#5
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...
April 2017: Cancer Medicine
https://www.readbyqxmd.com/read/28297421/characteristics-of-quantitative-perfusion-parameters-on-dynamic-contrast-enhanced-mri-in-mammographically-occult-breast-cancer
#6
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/28265853/response-derived-input-function-estimation-for-dynamic-contrast-enhanced-mri-demonstrated-by-anti-dll4-treatment-in-a-murine-u87-xenograft-model
#7
Matthew D Silva, Brittany Yerby, Jodi Moriguchi, Albert Gomez, H Toni Jun, Angela Coxon, Sharon E Ungersma
PURPOSE: Dynamic contrast-enhanced magnetic resonance imaging (DCE MRI) is an accepted method to evaluate tumor perfusion and permeability and anti-vascular cancer therapies. However, there is no consensus on the vascular input function estimation method, which is critical to kinetic modeling and K (trans) estimation. This work proposes a response-derived input function (RDIF) estimated from the response of the tumor, modeled as a linear, time-invariant (LTI) system. PROCEDURES: In an LTI system, an unknown input can be estimated from the system response...
March 6, 2017: Molecular Imaging and Biology: MIB: the Official Publication of the Academy of Molecular Imaging
https://www.readbyqxmd.com/read/28149758/defining-the-endpoints-how-to-measure-the-efficacy-of-drugs-that-are-active-against-central-nervous-system-metastases
#8
REVIEW
Alessandra Fabi, Antonello Vidiri
Brain metastases (BMs) are the most common cause of malignant central nervous system (CNS) tumors in adults. In the recent past, patients with BMs were excluded from clinical trials, but now, with the advent of new biological and immunological drugs, their inclusion is more common. In the last era response and progression criteria used across clinical trials have defined the importance to consider not only measurement changes of brain lesions but also the modification of parameters related to the metastases such as metabolism of tissue and its pathological features...
December 2016: Translational Lung Cancer Research
https://www.readbyqxmd.com/read/28144814/intravoxel-incoherent-motion-ivim-%C3%A2-diffusion-weighted-imaging-dwi-in-the-periferic-prostate-cancer-detection-and-stratification
#9
Filippo Pesapane, Francesca Patella, Enrico Maria Fumarola, Silvia Panella, Anna Maria Ierardi, Giovanni Guido Pompili, Giuseppe Franceschelli, Salvatore Alessio Angileri, Alberto Magenta Biasina, Gianpaolo Carrafiello
The aim of this study was to compare the Intravoxel Incoherent Motion (IVIM) parameters between healthy Peripheral Zone (PZ), Benign Prostatic Hyperplasia (BPH) and Prostate Cancer (PCa) and compare them to assess whether there was correlation with Gleason Score (GS) grading system. Thirty-one patients with suspect of PCa underwent 1.5T Multi-Parametric Magnetic Resonance Imaging (MP-MRI) with endorectal coil with a protocol including T2WI, DWI using 10 b values (0, 10, 20, 30, 50, 80, 100, 200, 400, 1000 s/mm(2)) and DCE...
March 2017: Medical Oncology
https://www.readbyqxmd.com/read/28113929/entropy-of-ultrasound-contrast-agent-velocity-fields-for-angiogenesis-imaging-in-prostate-cancer
#10
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/28111634/temporal-feature-extraction-from-dce-mri-to-identify-poorly-perfused-subvolumes-of-tumors-related-to-outcomes-of-radiation-therapy-in-head-and-neck-cancer
#11
Daekeun You, Madhava Aryal, Stuart E Samuels, Avraham Eisbruch, Yue Cao
This study aimed to develop an automated model to extract temporal features from DCE-MRI in head-and-neck (HN) cancers to localize significant tumor subvolumes having low blood volume (LBV) for predicting local and regional failure after chemoradiation therapy. Temporal features were extracted from time-intensity curves to build classification model for differentiating voxels with LBV from those with high BV. Support vector machine (SVM) classification was trained on the extracted features for voxel classification...
December 2016: Tomography: a Journal for Imaging Research
https://www.readbyqxmd.com/read/28106614/study-of-intrapatient-variability-and-reproducibility-of-quantitative-tumor-perfusion-parameters-evaluated-with-dynamic-contrast-enhanced-ultrasonography
#12
Nathalie Lassau, Bénédicte Coiffier, Laura Faivre, Baya Benatsou, Sophie Bidault, Elizabeth Girard, Bernard Asselain, Stéphanie Pitre-Champagnat, Serge Koscielny
OBJECTIVES: Dynamic contrast-enhanced (DCE) ultrasonography (US) is a functional imaging technique enabling quantitative assessment of solid tumor perfusion in metastatic patients treated with antiangiogenic therapies.The objective of this prospective single-center study was to evaluate in real-life conditions (in routine clinical practice) the intrapatient variability and reproducibility of DCE-US parameters. MATERIALS AND METHODS: Each patient provided written informed consent and had 2 DCE-US examinations (preprandial and postprandial) at baseline, day 15, and 1 month after treatment initiation...
March 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28092414/dce-mri-of-the-prostate-using-shutter-speed-vs-tofts-model-for-tumor-characterization-and-assessment-of-aggressiveness
#13
Stefanie J Hectors, Cecilia Besa, Mathilde Wagner, Guido H Jajamovich, George K Haines, Sara Lewis, Ashutosh Tewari, Ardeshir Rastinehad, Wei Huang, Bachir Taouli
PURPOSE: To quantify Tofts model (TM) and shutter-speed model (SSM) perfusion parameters in prostate cancer (PCa) and noncancerous peripheral zone (PZ) and to compare the diagnostic performance of dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) to Prostate Imaging and Reporting and Data System (PI-RADS) classification for the assessment of PCa aggressiveness. MATERIALS AND METHODS: Fifty PCa patients (mean age 60 years old) who underwent MRI at 3...
January 16, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28090589/spiral-perfusion-imaging-with-consecutive-echoes-spice%C3%A2-for-the-simultaneous-mapping-of-dsc-and-dce-mri-parameters-in-brain-tumor-patients-theory-and-initial-feasibility
#14
Eric S Paulson, Douglas E Prah, Kathleen M Schmainda
Dynamic contrast-enhanced (DCE) and dynamic susceptibility contrast (DSC) magnetic resonance imaging (MRI) are the perfusion imaging techniques most frequently used to probe the angiogenic character of brain neoplasms. With these methods, T1- and T2/T2*-weighted imaging sequences are used to image the distribution of gadolinium (Gd)-based contrast agents. However, it is well known that Gd exhibits combined T1, T2, and T2* shortening effects in tissue, and therefore, the results of both DCE- and DSC-MRI can be confounded by these opposing effects...
December 2016: Tomography: a Journal for Imaging Research
https://www.readbyqxmd.com/read/28060884/contrast-enhanced-ultrasound-with-vegfr2-targeted-microbubbles-for-monitoring-regorafenib-therapy-effects-in-experimental-colorectal-adenocarcinomas-in-rats-with-dce-mri-and-immunohistochemical-validation
#15
Ralf Stefan Eschbach, Dirk-Andre Clevert, Heidrun Hirner-Eppeneder, Michael Ingrisch, Matthias Moser, Jessica Schuster, Dina Tadros, Moritz Schneider, Philipp Maximilian Kazmierczak, Maximilian Reiser, Clemens C Cyran
OBJECTIVES: To investigate contrast-enhanced ultrasound (CEUS) with VEGFR2-targeted microbubbles for monitoring therapy effects of regorafenib on experimental colon carcinomas in rats with correlation to dynamic contrast-enhanced MRI (DCE-MRI) and immunohistochemistry. MATERIALS AND METHODS: Human colorectal adenocarcinoma xenografts (HT-29) were implanted subcutaneously in n = 21 (n = 11 therapy group; n = 10 control group) female athymic nude rats (Hsd: RH-Foxn1rnu)...
2017: PloS One
https://www.readbyqxmd.com/read/28048880/su-f-r-34-quantitative-perfusion-measurement-in-rectal-cancer-using-three-different-pharmacokinetic-models-implications-for-prospective-study-design
#16
K Nie, T Mao, L Shi, N Yue, S Jabbour, S Kim, X Hu, L Qian, X Sun, T Niu
PURPOSE: To compare three different pharmacokinetic models for analysis of dynamic-contrast-enhanced (DCE)-CT data with respect to different acquisition times and location of region of interest. METHODS: Eight rectal cancer patients with pre-treatment DCE-CTs were included. The dynamic sequence started 4-10seconds(s) after the injection of contrast agent. The scan included a 110s acquisition with intervals of 40×1s+15×3s+4×6s. An experienced oncologist outlined the tumor region...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048388/su-f-r-16-delineation-of-tumor-habitats-based-on-dynamic-contrast-enhanced-mri
#17
Y Chang, G Solorzano, E Ackerstaff, R Yechieli, T Subhawong, R Stoyanova
PURPOSE: To determine an automatic procedure for determining the number and delineation of tumor habitats from Dynamic Contrast Enhanced (DCE) MRI data. METHODS: An automatic procedure for delineation of tumor habitats from DCE-MRI datasets was developed as a two-part process involving: (1) statistical testing of the principal components of the dataset to detect the number of habitats and (2) the use of this number in an unsupervised pattern recognition (PR) technique to recover the temporal pattern and location of detected habitats...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047962/tu-h-206-03-characterizing-b1-inhomogeneities-in-dce-mri
#18
H Gach, N Mason
PURPOSE: Dynamic Contrast Enhanced (DCE) MRI is a valuable technique for measuring perfusion and permeability characteristics of tumors. Exogenous contrast concentrations are calculated based on changes in T1 measured using fast 3D gradient echo (FLASH) sequences. However, the slab selective pulses used in 3D MRI may result in B1 inhomogeneities across the volume of interest that can lead to errors in T1 and thus the estimated gadolinium concentration. We compared three FLASH DCE sequences (GRE, TWIST, and VIBE) to determine their signal homogeneity across slices and the accuracy in calculating T1 using acquisitions with variable flip angles...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047002/su-f-r-25-automatic-identification-of-suspicious-recurrent-residual-disease-regions-after-prostatectomy
#19
N A Parra, M Abramowitz, A Pollack, R Stoyanova
PURPOSE: To automatically identify and outline suspicious regions of recurrent or residual disease in the prostate bed using Dynamic Contrast Enhanced-MRI (DCE-MRI) in patients after prostatectomy. METHODS: Twenty-two patients presenting for salvage radiotherapy and with identified Gross Tumor Volume (GTV) in the prostate bed were retrospectively analyzed. The MRI data consisted of Axial T2weighted-MRI (T2w) of the pelvis: resolution 1.25×1.25×2.5 mm; Field of View (FOV): 320×320 mm; slice thickness=2...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28041318/dynamic-contrast-enhanced-magnetic-resonance-imaging-of-osseous-spine-metastasis-before-and-1-hour-after-high-dose-image-guided-radiation-therapy
#20
Eric Lis, Atin Saha, Kyung K Peck, Joan Zatcky, Michael J Zelefsky, Yoshiya Yamada, Andrei I Holodny, Mark H Bilsky, Sasan Karimi
OBJECTIVE High-dose image-guided radiation therapy (HD IGRT) has been instrumental in mitigating some limitations of conventional RT. The recent emergence of dynamic contrast-enhanced (DCE) MRI to investigate tumor physiology can be used to verify the response of human tumors to HD IGRT. The purpose of this study was to evaluate the near-immediate effects of HD IGRT on spine metastases through the use of DCE MRI perfusion studies. METHODS Six patients with spine metastases from prostate, thyroid, and renal cell carcinoma who underwent HD IGRT were studied using DCE MRI prior to and 1 hour after HD IGRT...
January 2017: Neurosurgical Focus
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