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https://www.readbyqxmd.com/read/30396660/investigating-the-correlation-of-arterial-spin-labeling-and-dynamic-contrast-enhanced-perfusion-in-primary-tumor-of-nasopharyngeal-carcinoma
#1
Meng Lin, Xiaoduo Yu, Dehong Luo, Han Ouyang, Lizhi Xie, Bing Wu, Chunwu Zhou
PURPOSE: This prospective study aimed to investigate the correlation between two perfusion methods: arterial spin labeling (ASL) and dynamic contrast enhanced (DCE) technique in patients with nasopharyngeal carcinoma (NPC) and to optimize ASL protocol. MATERIALS AND METHODS: Forty-five newly diagnosed NPC patients underwent MR examinations with both 3D pseudo-continuous ASL (pCASL) and DCE-MRI sequences. Tumor blood flow (TBF) derived in pCASL with three post-labeling delay (PLD) times (i...
November 2018: European Journal of Radiology
https://www.readbyqxmd.com/read/30357902/perfusion-of-the-placenta-assessed-using-arterial-spin-labeling-and-ferumoxytol-dynamic-contrast-enhanced-magnetic-resonance-imaging-in-the-rhesus-macaque
#2
Kai D Ludwig, Sean B Fain, Sydney M Nguyen, Thaddeus G Golos, Scott B Reeder, Ian M Bird, Dinesh M Shah, Oliver E Wieben, Kevin M Johnson
PURPOSE: To investigate the correspondence between arterial spin labeling (ASL) flow-sensitive alternating inversion recovery (FAIR) and ferumoxytol DCE MRI for the assessment of placental intervillous perfusion. METHODS: Ten pregnant macaques in late second trimester were imaged at 3 T using a 2D ASL FAIR, with and without outer-volume saturation pulses used to control the bolus width, and a 3D ferumoxytol DCE-MRI acquisition. The ASL tagged/control pairs were averaged, subtracted, and normalized to create perfusion ratio maps...
October 25, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29549455/evaluation-of-retained-products-of-conception-using-pulsed-continuous-arterial-spin-labeling-mri-clinical-feasibility-and-initial-results
#3
Nobuyuki Kosaka, Yasuhiro Fujiwara, Tetsuji Kurokawa, Tsuyoshi Matsuda, Masayuki Kanamoto, Naoyuki Takei, Kenji Takata, Jin Takahashi, Yoshio Yoshida, Hirohiko Kimura
OBJECTIVES: We evaluated the vascularity of retained products of conception (RPOC) using arterial spin-labeling magnetic resonance imaging (ASL-MRI) to clarify the clinical feasibility of this approach. MATERIALS AND METHODS: A pulsed-continuous ASL sequence with echo-planar imaging (EPI) acquisitions was used. Ten consecutive patients with RPOC were enrolled. All ASL images were evaluated visually and semiquantitatively and compared with the findings of Doppler ultrasound (US) and dynamic contrast-enhanced MRI (DCE-MRI)...
August 2018: Magma
https://www.readbyqxmd.com/read/29176470/quantitative-methods-in-abdominal-mri-perfusion-imaging
#4
REVIEW
Ananth J Madhuranthakam, Qing Yuan, Ivan Pedrosa
Recent improvements in arterial spin labeled (ASL) and vastly undersampled dynamic contrast-enhanced (DCE) magnetic resonance imaging (MRI) acquisitions are providing a new opportunity to explore the routine use of quantitative perfusion imaging for evaluation of a variety of abdominal diseases in clinical practice. In this review, we discuss different approaches for the acquisition and data analysis of ASL and DCE MRI techniques for quantification of tissue perfusion and present various clinical applications of these techniques in both neoplastic and non-neoplastic conditions in the abdomen...
December 2017: Topics in Magnetic Resonance Imaging: TMRI
https://www.readbyqxmd.com/read/29034514/measurement-of-murine-single-kidney-glomerular-filtration-rate-using-dynamic-contrast-enhanced-mri
#5
Kai Jiang, Hui Tang, Prasanna K Mishra, Slobodan I Macura, Lilach O Lerman
PURPOSE: To develop and validate a method for measuring murine single-kidney glomerular filtration rate (GFR) using dynamic contrast-enhanced MRI (DCE-MRI). METHODS: This prospective study was approved by the Institutional Animal Care and Use Committee. A fast longitudinal relaxation time (T1 ) measurement method was implemented to capture gadolinium dynamics (1 s/scan), and a modified two-compartment model was developed to quantify GFR as well as renal perfusion using 16...
June 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28543885/dce-mri-prediction-of-survival-time-for-patients-with-glioblastoma-multiforme-using-an-adaptive-neuro-fuzzy-based-model-and-nested-model-selection-technique
#6
Azimeh N V Dehkordi, Alireza Kamali-Asl, Ning Wen, Tom Mikkelsen, Indrin J Chetty, Hassan Bagher-Ebadian
This pilot study investigates the construction of an Adaptive Neuro-Fuzzy Inference System (ANFIS) for the prediction of the survival time of patients with glioblastoma multiforme (GBM). ANFIS is trained by the pharmacokinetic (PK) parameters estimated by the model selection (MS) technique in dynamic contrast enhanced-magnetic resonance imaging (DCE-MRI) data analysis, and patient age. DCE-MRI investigations of 33 treatment-naïve patients with GBM were studied. Using the modified Tofts model and MS technique, the following physiologically nested models were constructed: Model 1, no vascular leakage (normal tissue); Model 2, leakage without efflux; Model 3, leakage with bidirectional exchange (influx and efflux)...
September 2017: NMR in Biomedicine
https://www.readbyqxmd.com/read/28488024/glioma-grading-and-determination-of-idh-mutation-status-and-atrx-loss-by-dce-and-asl-perfusion
#7
Cornelia Brendle, Johann-Martin Hempel, Jens Schittenhelm, Marco Skardelly, Ghazaleh Tabatabai, Benjamin Bender, Ulrike Ernemann, Uwe Klose
PURPOSE: To evaluate arterial spin labeling (ASL) perfusion and dynamic contrast-enhanced (DCE) perfusion in glioma grading according to the previous WHO classification of 2007, as well as concerning isocitrate dehydrogenase (IDH) mutation status and ATRX expression as required by the new WHO 2016 brain tumor classification. METHODS: The mean values of Ktrans, Kep, Ve, and Vp by DCE perfusion, and cerebral blood flow (CBF) by ASL perfusion were assessed retrospectively in 40 patients with initial glioma diagnosis...
September 2018: Clinical Neuroradiology
https://www.readbyqxmd.com/read/28195664/an-adaptive-model-for-rapid-and-direct-estimation-of-extravascular-extracellular-space-in-dynamic-contrast-enhanced-mri-studies
#8
Azimeh N V Dehkordi, Alireza Kamali-Asl, James R Ewing, Ning Wen, Indrin J Chetty, Hassan Bagher-Ebadian
Extravascular extracellular space (ve ) is a key parameter to characterize the tissue of cerebral tumors. This study introduces an artificial neural network (ANN) as a fast, direct, and accurate estimator of ve from a time trace of the longitudinal relaxation rate, ΔR1 (R1  = 1/T1 ), in DCE-MRI studies. Using the extended Tofts equation, a set of ΔR1 profiles was simulated in the presence of eight different signal to noise ratios. A set of gain- and noise-insensitive features was generated from the simulated ΔR1 profiles and used as the ANN training set...
May 2017: NMR in Biomedicine
https://www.readbyqxmd.com/read/27876537/artificial-neural-networks-approach-to-pharmacokinetic-model-selection-in-dce-mri-studies
#9
Mohammad-Reza Mohammadian-Behbahani, Ali-Reza Kamali-Asl
PURPOSE: In pharmacokinetic analysis of Dynamic Contrast Enhanced MRI data, a descriptive physiological model should be selected properly out of a set of candidate models. Classical techniques suggested for this purpose suffer from issues like computation time and general fitting problems. This article proposes an approach based on Artificial Neural Networks (ANNs) for solving these problems. METHODS: A set of three physiologically and mathematically nested models generated from the Tofts model were assumed: Model I, II and III...
December 2016: Physica Medica: PM
https://www.readbyqxmd.com/read/27864008/renal-plasma-flow-rpf-measured-with-multiple-inversion-time-arterial-spin-labeling-asl-and-tracer-kinetic-analysis-validation-against-a-dynamic-contrast-enhancement-method
#10
Christopher C Conlin, Niels Oesingmann, Bradley Bolster, Yufeng Huang, Vivian S Lee, Jeff L Zhang
PURPOSE: To propose and validate a method for accurately quantifying renal plasma flow (RPF) with arterial spin labeling (ASL). MATERIALS AND METHODS: The proposed method employs a tracer-kinetic approach and derives perfusion from the slope of the ASL difference signal sampled at multiple inversion-times (TIs). To validate the method's accuracy, we performed a HIPAA-compliant and IRB-approved study with 15 subjects (9 male, 6 female; age range 24-73) to compare RPF estimates obtained from ASL to those from a more established dynamic contrast-enhanced (DCE) MRI method...
April 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/27160299/mri-based-assessment-of-liver-perfusion-and-hepatocyte-injury-in-the-murine-model-of-acute-hepatitis
#11
Katarzyna Byk, Krzysztof Jasinski, Zaneta Bartel, Agnieszka Jasztal, Barbara Sitek, Boguslaw Tomanek, Stefan Chlopicki, Tomasz Skorka
OBJECTIVE: To assess alterations in perfusion and liver function in the concanavalin A (ConA)-induced mouse model of acute liver failure (ALF) using two magnetic resonance imaging (MRI)-based methods: dynamic contrast-enhanced MRI (DCE-MRI) with Gd-EOB-DTPA contrast agent and arterial spin labelling (ASL). MATERIALS AND METHODS: BALB/c mice were studied using a 9.4 T MRI system. The IntraGateFLASH(TM) and FAIR-EPI pulse sequences were used for optimum mouse abdomen imaging...
December 2016: Magma
https://www.readbyqxmd.com/read/26814473/-mri-methods-for-pulmonary-ventilation-and-perfusion-imaging
#12
REVIEW
G Sommer, G Bauman
CLINICAL/METHODICAL ISSUE: Separate assessment of respiratory mechanics, gas exchange and pulmonary circulation is essential for the diagnosis and therapy of pulmonary diseases. Due to the global character of the information obtained clinical lung function tests are often not sufficiently specific in the differential diagnosis or have a limited sensitivity in the detection of early pathological changes. STANDARD RADIOLOGICAL METHODS: The standard procedures of pulmonary imaging are computed tomography (CT) for depiction of the morphology as well as perfusion/ventilation scintigraphy and single photon emission computed tomography (SPECT) for functional assessment...
February 2016: Der Radiologe
https://www.readbyqxmd.com/read/26796337/-quantitative-perfusion-imaging-in-magnetic-resonance-imaging
#13
REVIEW
F G Zöllner, T Gaa, F Zimmer, M M Ong, P Riffel, D Hausmann, S O Schoenberg, M Weis
CLINICAL/METHODICAL ISSUE: Magnetic resonance imaging (MRI) is recognized for its superior tissue contrast while being non-invasive and free of ionizing radiation. Due to the development of new scanner hardware and fast imaging techniques during the last decades, access to tissue and organ functions became possible. One of these functional imaging techniques is perfusion imaging with which tissue perfusion and capillary permeability can be determined from dynamic imaging data. STANDARD RADIOLOGICAL METHODS: Perfusion imaging by MRI can be performed by two approaches, arterial spin labeling (ASL) and dynamic contrast-enhanced (DCE) MRI...
February 2016: Der Radiologe
https://www.readbyqxmd.com/read/26422014/tumor-vascularity-in-renal-masses-correlation-of-arterial-spin-labeled-and-dynamic-contrast-enhanced-magnetic-resonance-imaging-assessments
#14
Yue Zhang, Payal Kapur, Qing Yuan, Yin Xi, Ingrid Carvo, Sabina Signoretti, Ivan Dimitrov, Jeffrey A Cadeddu, Vitaly Margulis, Naira Muradyan, James Brugarolas, Ananth J Madhuranthakam, Ivan Pedrosa
UNLABELLED: Arterial spin-labeled (ASL) and dynamic contrast-enhanced (DCE) magnetic resonance imaging (MRI) have been proposed to quantitatively assess vascularity in renal cell carcinoma (RCC). However, there are intrinsic differences between these 2 imaging methods, such as the relative contribution of vascular permeability and blood flow to signal intensity for DCE MRI. We found a correlation between ASL perfusion and the DCE-derived volume transfer constant and rate constant parameters in renal masses > 2 cm in size and these measures correlated with microvessel density in clear cell RCC...
February 2016: Clinical Genitourinary Cancer
https://www.readbyqxmd.com/read/25859832/state-of-the-art-mri-techniques-in-neuroradiology-principles-pitfalls-and-clinical-applications
#15
REVIEW
Magalie Viallon, Victor Cuvinciuc, Benedicte Delattre, Laura Merlini, Isabelle Barnaure-Nachbar, Seema Toso-Patel, Minerva Becker, Karl-Olof Lovblad, Sven Haller
This article reviews the most relevant state-of-the-art magnetic resonance (MR) techniques, which are clinically available to investigate brain diseases. MR acquisition techniques addressed include notably diffusion imaging (diffusion-weighted imaging (DWI), diffusion tensor imaging (DTI), and diffusion kurtosis imaging (DKI)) as well as perfusion imaging (dynamic susceptibility contrast (DSC), arterial spin labeling (ASL), and dynamic contrast enhanced (DCE)). The underlying models used to process these images are described, as well as the theoretic underpinnings of quantitative diffusion and perfusion MR imaging-based methods...
May 2015: Neuroradiology
https://www.readbyqxmd.com/read/25854511/feasibility-of-asl-spinal-bone-marrow-perfusion-imaging-with-optimized-inversion-time
#16
Dong Xing, Yunfei Zha, Liyong Yan, Kejun Wang, Wei Gong, Hui Lin
PURPOSE: To assess the correlation between flow-sensitive alternating inversion recovery (FAIR) and dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) in the measurement of spinal bone marrow (SBM) perfusion; in addition, to assess for an optimized inversion time (TI) as well as the reproducibility of SBM FAIR perfusion. MATERIALS AND METHODS: The optimized TI of a FAIR SBM perfusion experiment was carried out on 14 volunteers; two adjacent vertebral bodies were selected from each volunteer to measure the change of signal intensity (ΔM) and the signal-to-noise ratio (SNR) of FAIR perfusion MRI with five different TIs...
November 2015: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/24834412/dynamic-contrast-enhanced-magnetic-resonance-imaging-fundamentals-and-application-to-the-evaluation-of-the-peripheral-perfusion
#17
REVIEW
Yaron Gordon, Sasan Partovi, Matthias Müller-Eschner, Erick Amarteifio, Tobias Bäuerle, Marc-André Weber, Hans-Ulrich Kauczor, Fabian Rengier
INTRODUCTION: The ability to ascertain information pertaining to peripheral perfusion through the analysis of tissues' temporal reaction to the inflow of contrast agent (CA) was first recognized in the early 1990's. Similar to other functional magnetic resonance imaging (MRI) techniques such as arterial spin labeling (ASL) and blood oxygen level-dependent (BOLD) MRI, dynamic contrast-enhanced MRI (DCE-MRI) was at first restricted to studies of the brain. Over the last two decades the spectrum of ailments, which have been studied with DCE-MRI, has been extensively broadened and has come to include pathologies of the heart notably infarction, stroke and further cerebral afflictions, a wide range of neoplasms with an emphasis on antiangiogenic treatment and early detection, as well as investigations of the peripheral vascular and musculoskeletal systems...
April 2014: Cardiovascular Diagnosis and Therapy
https://www.readbyqxmd.com/read/24809332/a-comparison-of-arterial-spin-labeling-perfusion-mri-and-dce-mri-in-human-prostate-cancer
#18
COMPARATIVE STUDY
Wenchao Cai, Feiyu Li, Jing Wang, Huarui Du, Xiaoying Wang, Jue Zhang, Jing Fang, Xuexiang Jiang
Perfusion MRI has the potential to provide pathophysiological biomarkers for the evaluating, staging and therapy monitoring of prostate cancer. The objective of this study was to explore the feasibility of noninvasive arterial spin labeling (ASL) to detect prostate cancer in the peripheral zone and to investigate the correlation between the blood flow (BF) measured by ASL and the pharmacokinetic parameters K(trans) (forward volume transfer constant), kep (reverse reflux rate constant between extracellular space and plasma) and ve (the fractional volume of extracellular space per unit volume of tissue) measured by dynamic contrast-enhanced (DCE) MRI in patients with prostate cancer...
July 2014: NMR in Biomedicine
https://www.readbyqxmd.com/read/24601723/rate-and-extent-of-leakage-of-a-magnetic-resonance-contrast-agent-tend-to-be-lower-under-isoflurane-anesthesia-in-comparison-to-halothane-in-a-rat-model-of-embolic-stroke
#19
COMPARATIVE STUDY
Francisco J Bezerra, Morris Brown, William Alarcon, Kishor Karki, Robert A Knight, Kelly A Keenan, Tavarekere N Nagaraja
Cerebral blood flow (CBF) and blood-brain barrier (BBB) permeability by arterial spin labeling (ASL)- and dynamic contrast enhanced (DCE)-magnetic resonance imaging (MRI), respectively were repeatedly measured under either halothane (N  =  5) or isoflurane (N  =  5) anesthesia in a rat stroke model of embolic occlusion of middle cerebral artery (MCA). Cerebral blood flow measurements were made after MCA embolization, following intravenous recombinant tissue plasminogen activator (rtPA) treatment at 3 hours post-ictus and again at 48 hours...
September 2014: Neurological Research
https://www.readbyqxmd.com/read/24599625/comparison-of-asl-and-dce-mri-for-the-non-invasive-measurement-of-renal-blood-flow-quantification-and-reproducibility
#20
COMPARATIVE STUDY
Marica Cutajar, David L Thomas, Patrick W Hales, T Banks, Christopher A Clark, Isky Gordon
OBJECTIVES: To investigate the reproducibility of arterial spin labelling (ASL) and dynamic contrast-enhanced (DCE) magnetic resonance imaging (MRI) and quantitatively compare these techniques for the measurement of renal blood flow (RBF). METHODS: Sixteen healthy volunteers were examined on two different occasions. ASL was performed using a multi-TI FAIR labelling scheme with a segmented 3D-GRASE imaging module. DCE MRI was performed using a 3D-FLASH pulse sequence...
June 2014: European Radiology
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