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https://www.readbyqxmd.com/read/29782648/patient-preferences-for-topical-treatment-of-actinic-keratoses-a-discrete-choice-experiment
#1
D Kopasker, A Kwiatkowski, R N Matin, C A Harwood, F Ismail, J T Lear, J Thomson, Z Hasan, G N Wali, A Milligan, L Crawford, I Ahmed, H Duffy, C M Proby, P F Allanson
BACKGROUND: Treatment of actinic keratoses (AK) is a potentially effective strategy for prevention of cutaneous squamous cell carcinoma (cSCC). However, the patient perspective on potential benefits of AK treatment in terms of skin cancer reduction has received little attention to date. OBJECTIVES: (1) To investigate patient preferences for AK topical treatments using a discrete choice experiment (DCE); (2) To evaluate patient willingness to trade between clinical benefit and medical burden...
May 21, 2018: British Journal of Dermatology
https://www.readbyqxmd.com/read/29781342/dw-mri-and-dce-mri-are-of-complementary-value-in-predicting-pathologic-response-to-neoadjuvant-chemoradiotherapy-for-esophageal-cancer
#2
Sophie E Heethuis, Lucas Goense, Peter S N van Rossum, Alicia S Borggreve, Stella Mook, Francine E M Voncken, Annemarieke Bartels-Rutten, Berthe M P Aleman, Richard van Hillegersberg, Jelle P Ruurda, Gert J Meijer, Jan J W Lagendijk, Astrid L H M W van Lier
PURPOSE: To explore the potential benefit and complementary value of a multiparametric approach using diffusion-weighted (DW-) and dynamic contrast-enhanced (DCE-) magnetic resonance imaging (MRI) for prediction of response to neoadjuvant chemoradiotherapy (nCRT) in esophageal cancer. MATERIAL AND METHODS: Forty-five patients underwent both DW-MRI and DCE-MRI prior to nCRT (pre), during nCRT (week 2-3) (per) and after completion of nCRT, but prior to esophagectomy (post)...
May 21, 2018: Acta Oncologica
https://www.readbyqxmd.com/read/29777820/accuracy-and-precision-of-quantitative-dce-mri-parameters-how-should-one-estimate-contrast-concentration
#3
Nicole Wake, Hersh Chandarana, Henry Rusinek, Koji Fujimoto, Linda Moy, Daniel K Sodickson, Sungheon Gene Kim
INTRODUCTION: Pharmacokinetic parameters derived from dynamic contrast-enhanced MRI (DCE-MRI) data are sensitive to acquisition and post-processing techniques, which makes it difficult to compare results obtained using different methods. In particular, one of the most important factors affecting estimation of model parameters is how to convert MRI signal intensities to contrast agent concentration. The purpose of our study was to quantitatively compare a linear signal-to-concentration conversion (LC) as an approximation and a non-linear conversion (NLC) based on the MRI signal equation, in terms of the accuracy and precision of the pharmacokinetic parameters in T1 -weighted DCE-MRI...
May 16, 2018: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/29774632/an-exploration-of-the-non-iterative-time-trade-off-method-to-value-health-states
#4
Yan Feng, Arne Risa Hole, Milad Karimi, Aki Tsuchiya, Ben van Hout
Time Trade-Off (TTO) usually relies on "iteration," which is susceptible to bias. Discrete Choice Experiment with duration (or DCETTO ) is free of such bias, but respondents find this cognitively more challenging. This paper explores non-iterative TTO with or without lead time: NI(LT)TTO. In NI(LT)TTO, respondents see a series of independent pairwise choices without iteration (similar to DCETTO ), but one of the two scenarios always involves full health for a shorter duration (similar to TTO). We compare three different "types" of NI(LT)TTO relative to DCETTO ...
May 17, 2018: Health Economics
https://www.readbyqxmd.com/read/29774398/improved-detection-of-a-tumorous-involvement-of-the-mesorectal-fascia-and-locoregional-lymph-nodes-in-locally-advanced-rectal-cancer-using-dce-mri
#5
Marco Armbruster, Melvin D'Anastasi, Veronika Holzner, Martin E Kreis, Olaf Dietrich, Bernhard Brandlhuber, Anno Graser, Martina Brandlhuber
PURPOSE: The prediction of an infiltration of the mesorectal fascia (MRF) and malignant lymph nodes is essential for treatment planning and prognosis of patients with rectal cancer. The aim of this study was to assess the additional diagnostic value of dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) for the detection of a malignant involvement of the MRF and of mesorectal lymph nodes in patients with locally advanced rectal cancer. METHODS: In this prospective study, 22 patients with locally advanced rectal cancer were examined with 1...
May 17, 2018: International Journal of Colorectal Disease
https://www.readbyqxmd.com/read/29771954/preoperative-prediction-of-microvascular-invasion-of-hepatocellular-carcinoma-with-ivim-diffusion-weighted-mr-imaging-and-gd-eob-dtpa-enhanced-mr-imaging
#6
Wei Zhao, Wenguang Liu, Huaping Liu, Xiaoping Yi, Jiale Hou, Yigang Pei, Hui Liu, Deyun Feng, Liyu Liu, Wenzheng Li
Microvascular invasion (MVI) is regarded as one of the independent risk factors for recurrence and poor prognosis of hepatocellular carcinoma (HCC). The presence of MVI in HCCs was evaluated on the basis of pathological reports of surgical specimens and was defined as tumor within a vascular space lined by endothelium that was visible only on microscopy. The aim of the study was to investigate the usefulness of intravoxel incoherent motion (IVIM) diffusion weighted (DW) magnetic resonance (MR) imaging in predicting MVI of HCC...
2018: PloS One
https://www.readbyqxmd.com/read/29771932/a-multi-center-preclinical-study-of-gadoxetate-dce-mri-in-rats-as-a-biomarker-of-drug-induced-inhibition-of-liver-transporter-function
#7
Anastassia Karageorgis, Stephen C Lenhard, Brittany Yerby, Mikael F Forsgren, Serguei Liachenko, Edvin Johansson, Mark A Pilling, Richard A Peterson, Xi Yang, Dominic P Williams, Sharon E Ungersma, Ryan E Morgan, Kim L R Brouwer, Beat M Jucker, Paul D Hockings
Drug-induced liver injury (DILI) is a leading cause of acute liver failure and transplantation. DILI can be the result of impaired hepatobiliary transporters, with altered bile formation, flow, and subsequent cholestasis. We used gadoxetate dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI), combined with pharmacokinetic modelling, to measure hepatobiliary transporter function in vivo in rats. The sensitivity and robustness of the method was tested by evaluating the effect of a clinical dose of the antibiotic rifampicin in four different preclinical imaging centers...
2018: PloS One
https://www.readbyqxmd.com/read/29770495/prostate-dce-mri-with-b1-correction-using-an-approximated-analytical-approach
#8
Xinran Zhong, Thomas Martin, Holden H Wu, Krishna S Nayak, Kyunghyun Sung
PURPOSE: To develop and evaluate a practical B1+ correction method for prostate dynamic contrast-enhanced (DCE) MRI analysis. THEORY: We proposed a simple analytical B1+ correction method using a Taylor series approximation to the steady-state spoiled gradient echo signal equation. This approach only requires B1+ maps and uncorrected pharmacokinetic (PK) parameters as input to estimate the corrected PK parameters. METHODS: The proposed method was evaluated using a prostate digital reference object (DRO), and 82 in vivo prostate DCE-MRI cases...
May 16, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29769199/metabolic-imaging-of-the-human-brain-with-hyperpolarized-13c-pyruvate-demonstrates-13c-lactate-production-in-brain-tumor-patients
#9
Vesselin Z Miloushev, Kristin L Granlund, Rostislav Boltyanskiy, Serge K Lyashchenko, Lisa M DeAngelis, Ingo K Mellinghoff, Cameron W Brennan, Viviane Tabar, T Jonathan Yang, Andrei I Holodny, Ramon E Sosa, YanWei W Guo, Albert P Chen, James Tropp, Fraser Robb, Kayvan R Keshari
Hyperpolarized (HP) magnetic resonance imaging using [1-13C] pyruvate is a novel method that can characterize energy metabolism in the human brain and brain tumors. Here we present the first dynamically acquired human brain HP 13C metabolic spectra and spatial metabolite maps in cases of both untreated and recurrent tumors. In vivo production of HP lactate from HP pyruvate by tumors was indicative of altered cancer metabolism, while production of HP lactate in the entire brain was likely due to baseline metabolism...
May 16, 2018: Cancer Research
https://www.readbyqxmd.com/read/29766930/measurement-of-the-permeability-perfusion-and-histogram-characteristics-in-relapsing-remitting-multiple-sclerosis-using-dynamic-contrast-enhanced-mri-with-extended-tofts-linear-model
#10
Ping Yin, Hua Xiong, Yi Liu, Shambhu K Sah, Chun Zeng, Jingjie Wang, Yongmei Li, Nan Hong
Objective: To investigate the application value of using dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) with extended Tofts linear model for relapsing-remitting multiple sclerosis (RRMS) and its correlation with expanded disability status scale (EDSS) scores and disease duration. Materials and Methods: Thirty patients with multiple sclerosis (MS) underwent conventional magnetic resonance imaging (MRI) and DCE-MRI with a 3.0 Tesla MR scanner. An extended Tofts linear model was used to quantitatively measure MR imaging biomarkers...
May 2018: Neurology India
https://www.readbyqxmd.com/read/29766921/quantification-of-blood-brain-barrier-using-dce-mri-in-multiple-sclerosis-technical-issues-and-its-possible-role-in-routine-clinical-practice
#11
EDITORIAL
https://www.readbyqxmd.com/read/29765520/histogram-analysis-parameters-of-dynamic-contrast-enhanced-magnetic-resonance-imaging-can-predict-histopathological-findings-including-proliferation-potential-cellularity-and-nucleic-areas-in-head-and-neck-squamous-cell-carcinoma
#12
Alexey Surov, Hans Jonas Meyer, Leonard Leifels, Anne-Kathrin Höhn, Cindy Richter, Karsten Winter
Our purpose was to analyze possible associations between histogram analysis parameters of dynamic contrast-enhanced magnetic resonance imaging DCE MRI and histopathological findings like proliferation index, cell count and nucleic areas in head and neck squamous cell carcinoma (HNSCC). 30 patients (mean age 57.0 years) with primary HNSCC were included in the study. In every case, histogram analysis parameters of Ktrans , Ve , and Kep were estimated using a mathlab based software. Tumor proliferation index, cell count, and nucleic areas were estimated on Ki 67 antigen stained specimens...
April 20, 2018: Oncotarget
https://www.readbyqxmd.com/read/29765295/incentives-for-blood-donation-a-discrete-choice-experiment-to-analyze-extrinsic-motivation
#13
Andrew Sadler, Ling Shi, Susanne Bethge, Axel Mühlbacher
Background: Demographic trends affect size and age structure of populations. One of the consequences will be an increasing need for blood products to treat age-related diseases. Donation services rely on voluntariness and charitable motivation. It might be questioned whether there will be sufficient blood supply with voluntary donation. The present study focused on elicitation of preferences for incentives and aimed to contribute to the discussion on how to increase donation rates. Methods: A self-administered discrete choice experiment (DCE) was applied...
April 2018: Transfusion Medicine and Hemotherapy
https://www.readbyqxmd.com/read/29754996/dce-mri-in-human-gliomas-a-surrogate-for-assessment-of-invasive-hypoxia-marker-hif-1%C3%AE-based-on-mri-neuronavigation-stereotactic-biopsies
#14
Qian Xie, Juan Wu, Zunguo Du, Ningning Di, Ren Yan, Haopeng Pang, Teng Jin, Hua Zhang, Yue Wu, Yong Zhang, Zhenwei Yao, Xiaoyuan Feng
RATIONALE AND OBJECTIVES: The purpose of this study was to correlate dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) parameters with data from a specific marker of hypoxia, hypoxia-inducible factor 1α (HIF-1α), in human gliomas on a point-to-point basis by using coregistered magnetic resonance imaging and frameless stereotactic biopsies. MATERIALS AND METHODS: Thirty-four patients with treatment-naive gliomas underwent DCE, axial T1-weighted, T2-weighted, T2-weighted fluid acquisition of inversion recovery, and three-dimensional T1-weighted brain volume with gadolinium contrast enhancement sequences on a 3...
May 10, 2018: Academic Radiology
https://www.readbyqxmd.com/read/29754871/dynamic-contrast-enhanced-mr-imaging-of-the-rectum-correlations-between-single-section-and-whole-tumor-histogram-analyses
#15
M H Choi, S N Oh, G E Park, D-M Yeo, S E Jung
PURPOSE: To evaluate the interobserver and intermethod correlations of histogram metrics of dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) parameters acquired by multiple readers using the single-section and whole-tumor volume methods. MATERIALS AND METHODS: Four DCE parameters (Ktrans , Kep , Ve , Vp ) were evaluated in 45 patients (31 men and 14 women; mean age, 61±11 years [range, 29-83 years]) with locally advanced rectal cancer using pre-chemoradiotherapy (CRT) MRI...
May 10, 2018: Diagnostic and Interventional Imaging
https://www.readbyqxmd.com/read/29753358/handling-data-quality-issues-to-estimate-the-spanish-eq-5d-5l-value-set-using-a-hybrid-interval-regression-approach
#16
Juan M Ramos-Goñi, Benjamin M Craig, Mark Oppe, Yolanda Ramallo-Fariña, Jose Luis Pinto-Prades, Nan Luo, Oliver Rivero-Arias
BACKGROUND: The Spanish five-level EuroQol five-dimensional questionnaire (EQ-5D-5L) valuation study was the first to use the EuroQol Valuation Technology protocol, including composite time trade-off (C-TTO) and discrete choice experiments (DCE). In this study, its investigators noticed that some interviewers did not fully explain the C-TTO task to respondents. Evidence from a follow-up study in 2014 confirmed that when interviewers followed the protocol, the distribution of C-TTO responses widened...
May 2018: Value in Health: the Journal of the International Society for Pharmacoeconomics and Outcomes Research
https://www.readbyqxmd.com/read/29753350/societal-preferences-for-funding-orphan-drugs-in-the-united-kingdom-an-application-of-person-trade-off-and-discrete-choice-experiment-methods
#17
Siobhan M Bourke, Catrin O Plumpton, Dyfrig A Hughes
BACKGROUND: It is unclear whether UK National Health Service (NHS) policies for orphan drugs, which permit funding of non-cost-effective treatments, reflect societal preferences. METHODS: We conducted person trade-off (PTO) and discrete choice experiment (DCE) among 3950 adults selected to be representative of the UK general population. Experimental design was informed by surveys of patients affected by rare diseases, their caregivers, health care staff, and policymakers...
May 2018: Value in Health: the Journal of the International Society for Pharmacoeconomics and Outcomes Research
https://www.readbyqxmd.com/read/29752976/can-dynamic-contrast-enhanced-mri-evaluate-vegf-expression-in-brain-glioma-an-mri-guided-stereotactic-biopsy-study
#18
Ningning Di, Wenna Cheng, Xingyue Jiang, Xinjiang Liu, Jinliang Zhou, Qian Xie, Zhihui Chu, Huacheng Chen, Bin Wang
PURPOSE: To investigate whether pharmacokinetic parameters derived from dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) can be used to evaluate vascular endothelial growth factor (VEGF) expression in brain glioma based on a point-to-point basis. MATERIALS AND METHODS: Forty-seven patients with treatment-naïve glioma received preoperative DCE-MRI before stereotactic biopsy. We histologically quantified VEGF from section of stereotactic biopsies, and co-registered biopsy locations with localized measurements of DCE-MRI parameters including volume transfer coefficient (Ktrans ), reverse reflux rate constant (Kep), extracellular extravascular volume fraction (Ve) and blood plasma volume (Vp)...
May 9, 2018: Journal of Neuroradiology. Journal de Neuroradiologie
https://www.readbyqxmd.com/read/29745982/an-extended-reference-region-model-for-dce-mri-that-accounts-for-plasma-volume
#19
Zaki Ahmed, Ives R Levesque
The reference region model (RRM) for dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) provides pharmacokinetic parameters without requiring the arterial input function. A limitation of the RRM is that it assumes that the blood plasma volume in the tissue of interest is zero, but this is often not true in highly vascularized tissues, such as some tumours. This study proposes an extended reference region model (ERRM) to account for tissue plasma volume. Furthermore, ERRM was combined with a two-fit approach to reduce the number of fitting parameters, and this was named the constrained ERRM (CERRM)...
May 10, 2018: NMR in Biomedicine
https://www.readbyqxmd.com/read/29744935/fast-magnetic-resonance-fingerprinting-for-dynamic-contrast-enhanced-studies-in-mice
#20
Yuning Gu, Charlie Y Wang, Christian E Anderson, Yuchi Liu, He Hu, Mette L Johansen, Dan Ma, Yun Jiang, Ciro Ramos-Estebanez, Susann Brady-Kalnay, Mark A Griswold, Chris A Flask, Xin Yu
PURPOSE: The goal of this study was to develop a fast MR fingerprinting (MRF) method for simultaneous T1 and T2 mapping in DCE-MRI studies in mice. METHODS: The MRF sequences based on balanced SSFP and fast imaging with steady-state precession were implemented and evaluated on a 7T preclinical scanner. The readout used a zeroth-moment-compensated variable-density spiral trajectory that fully sampled the entire k-space and the inner 10 × 10 k-space with 48 and 4 interleaves, respectively...
May 9, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
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