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https://www.readbyqxmd.com/read/28635617/the-dosimetric-impact-of-gadolinium-based-contrast-media-in-gbm-brain-patient-plans-for-a-mri-linac
#1
Syed Bilal Ahmad, Moti Raj Paudel, Arman Sarfehnia, Anthony Kim, Geordi Pang, Mark Ruschin, Arjun Sahgal, Brian M Keller
Dosimetric effects of gadolinium based contrast media (Gadovist) were evaluated for the Elekta MRI Linear accelerator (MRL) using the research version of Monaco treatment planning system (TPS). In order to represent a gadolinium uptake it was manually assigned to a phantom as well as to the Gross Tumour Volume (GTV) of 6 Glioblastoma Multiforme (GBM) patients. A preliminary estimate of dose enhancement, due to gadolinium, was performed using the phantom irradiated with a single beam. More complicated assessment was performed for the GBM patients using a 7 field IMRT technique...
June 21, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28586445/relative-conspicuity-of-gadolinium-based-contrast-agents-in-interventional-pain-procedures
#2
Timothy P Maus, Beth A Schueler, Dixon J Magnuson, Dayne Magnuson
Objective: To assess the relative radiographic conspicuity of gadolinium-based contrast agents (GBCAs) that may be used in spinal injection procedures when iodine-based contrast agents are contraindicated. Methods: Eight GBCAs and three iodinated agents of varying iodine concentrations were radiographed under conditions representative of lumbar spinal injections at four kilovoltage peak (kVp) values. Radiographic contrast of each agent was measured as the percent pixel value difference with respect to background...
April 1, 2017: Pain Medicine: the Official Journal of the American Academy of Pain Medicine
https://www.readbyqxmd.com/read/28570419/ultra-high-field-9-4-t-mri-analysis-of-contrast-agent-transport-across-the-blood-perilymph-barrier-and-intrastrial-fluid-blood-barrier-in-the-mouse-inner-ear
#3
S Allen Counter, Sahar Nikkhou-Aski, Peter Damberg, Cecilia Engmér Berglin, Göran Laurell
HYPOTHESIS: Effective paramagnetic contrast agent for the penetration of the perilymphatic spaces of the scala tympani, scala vestibuli, and scala media of the mouse inner ear can be determined using intravenous injection of various gadolinium (Gd) complexes and ultra-high-field magnetic resonance imaging (MRI) at 9.4 Tesla. BACKGROUND: A number of contrast agents have been explored in experimental high-field MRI to determine the most effective Gd complex for ideal signal-to-noise ratio and maximal visualization of the in vivo mammalian inner ear in analyzing the temporal and spatial parameters involved in drug penetration of the blood-perilymph barrier and intrastrial fluid-blood barrier in the mouse model using MRI...
August 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/28412420/stress-perfusion-cmr-in-patients-with-known-and-suspected-cad-prognostic-value-and-optimal-ischemic-threshold-for-revascularization
#4
Gabriella Vincenti, Pier Giorgio Masci, Pierre Monney, Tobias Rutz, Sarah Hugelshofer, Mirdita Gaxherri, Olivier Muller, Juan F Iglesias, Eric Eeckhout, Valentina Lorenzoni, Cyril Pellaton, Christophe Sierro, Juerg Schwitter
OBJECTIVES: This study sought to determine the ischemia threshold and additional prognostic factors that identify patients for safe deferral from revascularizations in a large cohort of all-comer patients with known or suspected coronary artery disease (CAD). BACKGROUND: Stress-perfusion cardiac magnetic resonance (CMR) is increasingly used in daily practice for ischemia detection. However, there is insufficient evidence about the ischemia burden that identifies patients who benefit from revascularization versus those with a good prognosis who receive drugs only...
May 2017: JACC. Cardiovascular Imaging
https://www.readbyqxmd.com/read/28283728/survey-of-gadolinium-based-contrast-agent-utilization-among-the-members-of-the-society-for-pediatric-radiology-a-quality-and-safety-committee-report
#5
Einat Blumfield, Michael M Moore, Mary K Drake, Thomas R Goodman, Kristopher N Lewis, Laura T Meyer, Thang D Ngo, Christina Sammet, Arta Luana Stanescu, David W Swenson, Thomas L Slovis, Ramesh S Iyer
BACKGROUND: Gadolinium-based contrast agents (GBCAs) have been used for magnetic resonance (MR) imaging over the last three decades. Recent reports demonstrated gadolinium retention in patients' brains following intravenous administration. Since gadolinium is a highly toxic heavy metal, there is a potential for adverse effects from prolonged retention or deposition, particularly in children. For this reason, the Society (SPR) for Pediatric Radiology Quality and Safety committee conducted a survey to evaluate the current status of GBCAs usage among pediatric radiologists...
May 2017: Pediatric Radiology
https://www.readbyqxmd.com/read/28194885/in-vivo-bioluminescence-imaging-of-neurogenesis-the-role-of-the-blood-brain-barrier-in-an-experimental-model-of-parkinson-s-disease
#6
Inga B Fricke, Sonja Schelhaas, Bastian Zinnhardt, Thomas Viel, Sven Hermann, Sébastien Couillard-Després, Andreas H Jacobs
Bioluminescence imaging in transgenic mice expressing firefly luciferase in Doublecortin(+) (Dcx) neuroblasts might serve as a powerful tool to study the role of neurogenesis in models of brain injury and neurodegeneration using non-invasive, longitudinal in vivo imaging. Therefore, we aimed to use BLI in B6(Cg)-Tyrc-2J/J Dcx-Luc (Doublecortin-Luciferase, Dcx-Luc) mice to investigate its suitability to assess neurogenesis in a unilateral injection model of Parkinson's disease. We further aimed to assess the blood brain barrier leakage associated with the intranigral 6-OHDA injection to evaluate its impact on substrate delivery and bioluminescence signal intensity...
April 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28125438/quantification-and-assessment-of-the-chemical-form-of-residual-gadolinium-in-the-brain-after-repeated-administration-of-gadolinium-based-contrast-agents-comparative-study-in-rats
#7
Thomas Frenzel, Chirag Apte, Gregor Jost, Laura Schöckel, Jessica Lohrke, Hubertus Pietsch
OBJECTIVE: Multiple clinical and preclinical studies have reported a signal intensity increase and the presence of gadolinium (Gd) in the brain after repeated administration of Gd-based contrast agents (GBCAs). This bioanalytical study in rat brain tissue was initiated to investigate whether the residual Gd is present as intact GBCA or in other chemical forms by using tissue fractionation and chromatography. MATERIALS AND METHODS: Rats were divided randomly in 6 groups of 10 animals each...
July 2017: Investigative Radiology
https://www.readbyqxmd.com/read/27716273/a-clinical-combined-gadobutrol-bolus-and-slow-infusion-protocol-enabling-angiography-inversion-recovery-whole-heart-and-late-gadolinium-enhancement-imaging-in-a-single-study
#8
Animesh Tandon, Lorraine James, Markus Henningsson, René M Botnar, Amanda Potersnak, Gerald F Greil, Tarique Hussain
BACKGROUND: The use of gadolinium contrast agents in cardiovascular magnetic resonance is well-established and serves to improve both vascular imaging as well as enable late gadolinium enhancement (LGE) imaging for tissue characterization. Currently, gadofosveset trisodium, an intravascular contrast agent, combined with a three-dimensional inversion recovery balanced steady state free precession (3D IR bSSFP) sequence, is commonly used in pediatric cardiac imaging and yields excellent vascular imaging, but cannot be used for late gadolinium enhancement...
October 5, 2016: Journal of Cardiovascular Magnetic Resonance
https://www.readbyqxmd.com/read/27652261/immediate-adverse-reactions-to-gadolinium-based-mr-contrast-media-a-retrospective-analysis-on-10-608-examinations
#9
Vincenza Granata, Marco Cascella, Roberta Fusco, Nicoletta dell'Aprovitola, Orlando Catalano, Salvatore Filice, Vincenzo Schiavone, Francesco Izzo, Arturo Cuomo, Antonella Petrillo
Background and Purpose. Contrast media (CM) for magnetic resonance imaging (MRI) may determine the development of acute adverse reactions. Objective was to retrospectively assess the frequency and severity of adverse reactions associated with gadolinium-based contrast agents (GBCAs) injection in patients who underwent MRI. Material and Methods. At our center 10608 MRI examinations with CM were performed using five different GBCAs: Gd-BOPTA (MultiHance), Gd-DTPA (Magnevist), Gd-EOBDTPA (Primovist), Gd-DOTA (Dotarem), and Gd-BTDO3A (Gadovist)...
2016: BioMed Research International
https://www.readbyqxmd.com/read/27098885/rapid-and-robust-variable-flip-angle-t1-mapping-using-interleaved-two-dimensional-multislice-spoiled-gradient-echo-imaging
#10
Rahel Heule, Oliver Bieri
PURPOSE: Conventional T1 mapping using three-dimensional (3D) radiofrequency (RF) spoiled gradient echo (SPGR) imaging with short repetition times (TR) is adversely affected by incomplete spoiling (i.e. residual T2 dependency). In this work, an optimized interleaved 2D multislice SPGR sequence scheme and an adapted postprocessing procedure are evaluated for highly T2 -insensitive T1 quantification of human brain tissues. METHODS: An efficient 2D multislice SPGR protocol including a relatively long TR of 200 ms is investigated with careful consideration of cross talk and magnetization transfer effects...
April 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/26863577/macrocyclic-and-other-non-group-1-gadolinium-contrast-agents-deposit-low-levels-of-gadolinium-in-brain-and-bone-tissue-preliminary-results-from-9-patients-with-normal-renal-function
#11
Nozomu Murata, Luis F Gonzalez-Cuyar, Kiyoko Murata, Corinne Fligner, Russell Dills, Daniel Hippe, Kenneth R Maravilla
OBJECTIVE: The purpose of this study was to determine whether gadolinium (Gd) is deposited in brain and bone tissues in patients receiving only non-Group 1 agents, either macrocyclic or linear protein interacting Gd-based contrast agents, with normal renal function. Group 1 agents are linear agents most associated with nephrogenic systemic fibrosis that the US Federal Drug Administration has defined as contraindicated in patients at risk for this disease. MATERIALS AND METHODS: This study was institutional review board approved and Health Insurance Portability and Accountability Act compliant for retrospective review of records and also had signed autopsy consent authorizing use of decedent's tissue in research studies...
July 2016: Investigative Radiology
https://www.readbyqxmd.com/read/26619282/effect-of-temporal-resolution-on-diagnostic-performance-of-dynamic-contrast-enhanced-magnetic-resonance-imaging-of-the-prostate
#12
Ahmed E Othman, Florian Falkner, Jakob Weiss, Stephan Kruck, Robert Grimm, Petros Martirosian, Konstantin Nikolaou, Mike Notohamiprodjo
OBJECTIVE: The aim of this study was to assess the effect of temporal resolution on semiquantitative and pharmacokinetic parameters from dynamic contrast-enhanced (DCE) magnetic resonance imaging (MRI) and their diagnostic accuracy regarding the detection of potentially malignant prostate lesions. MATERIALS AND METHODS: Sixty consecutive male patients (age, 64.5 ± 7.0 years) with clinically suspected prostate cancer were included. All patients underwent multiparametric MRI of the prostate (T2-weighted, diffusion-weighted imaging, and DCE-MRI) on a 3 T MRI scanner...
May 2016: Investigative Radiology
https://www.readbyqxmd.com/read/26268906/multi-modal-magnetic-resonance-imaging-and-histology-of-vascular-function-in-xenografts-using-macromolecular-contrast-agent-hyperbranched-polyglycerol-hpg-gdf
#13
Jennifer H E Baker, Kelly C McPhee, Firas Moosvi, Katayoun Saatchi, Urs O Häfeli, Andrew I Minchinton, Stefan A Reinsberg
Macromolecular gadolinium (Gd)-based contrast agents are in development as blood pool markers for MRI. HPG-GdF is a 583 kDa hyperbranched polyglycerol doubly tagged with Gd and Alexa 647 nm dye, making it both MR and histologically visible. In this study we examined the location of HPG-GdF in whole-tumor xenograft sections matched to in vivo DCE-MR images of both HPG-GdF and Gadovist. Despite its large size, we have shown that HPG-GdF extravasates from some tumor vessels and accumulates over time, but does not distribute beyond a few cell diameters from vessels...
January 2016: Contrast Media & Molecular Imaging
https://www.readbyqxmd.com/read/26069143/acute-respiratory-distress-syndrome-after-the-use-of-gadolinium-contrast-media
#14
Jihye Park, Il Hwan Byun, Kyung Hee Park, Jae-Hyun Lee, Eun Ji Nam, Jung-Won Park
Acute respiratory distress syndrome (ARDS) is a medical emergency that threatens life. To this day, ARDS is very rarely reported by iodine contrast media, and there is no reported case of ARDS induced by gadolinium contrast media. Here, we present a case with ARDS after the use of gadobutrol (Gadovist) as a magnetic resonance imaging (MRI) contrast medium. A 26 years old female without any medical history, including allergic diseases and without current use of drugs, visited the emergency room for abdominal pain...
July 2015: Yonsei Medical Journal
https://www.readbyqxmd.com/read/25670214/characterisation-and-application-of-ultra-high-spin-clusters-as-magnetic-resonance-relaxation-agents
#15
Gisela Guthausen, Julyana R Machado, Burkhard Luy, Amer Baniodeh, Annie K Powell, Steffen Krämer, Florian Ranzinger, Maria P Herrling, Susanne Lackner, Harald Horn
In Magnetic Resonance Tomography (MRT) image contrast can be improved by adding paramagnetic relaxation agents such as lanthanide ions. Here we report on the use of highly paramagnetic isostructural Fe(III)/4f coordination clusters with a [Fe10Ln10] core to enhance relaxation. Measurements were performed over the range of (1)H Larmor frequencies of 10 MHz to 1.4 GHz in order to determine the relevant parameters for longitudinal and transverse relaxivities. Variation of the lanthanide ion allows differentiation of relaxation contributions from electronic states and molecular dynamics...
March 21, 2015: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/25638228/single-bolus-versus-split-dose-gadolinium-administration-in-extra-cellular-volume-calculation-at-3-tesla
#16
Adam K McDiarmid, Peter P Swoboda, Bara Erhayiem, David P Ripley, Ananth Kidambi, David A Broadbent, David M Higgins, John P Greenwood, Sven Plein
BACKGROUND: Diffuse myocardial fibrosis may be quantified with cardiovascular magnetic resonance (CMR) by calculating extra-cellular volume (ECV) from native and post-contrast T1 values. Accurate ECV calculation is dependent upon the contrast agent having reached equilibrium within tissue compartments. Previous studies have used infusion or single bolus injections of contrast to calculate ECV. In clinical practice however, split dose contrast injection is commonly used as part of stress/rest perfusion studies...
2015: Journal of Cardiovascular Magnetic Resonance
https://www.readbyqxmd.com/read/25154504/gadolinium-detection-via-in-vivo-prompt-gamma-neutron-activation-analysis-following-gadolinium-based-contrast-agent-injection-a-pilot-study-in-10-human-participants
#17
J L Gräfe, F E McNeill, M D Noseworthy, D R Chettle
Gadolinium (Gd) based contrast agents are routinely used as part of many magnetic resonance imaging (MRI) procedures. The widespread use of these agents and concerns about Gd toxicity, motivated us to develop a monitoring procedure that could non-invasively measure quantitatively potential retention of toxic free Gd in tissues after use of the agent. We have been developing a method to measure Gd painlessly and non-invasively by prompt gamma neutron activation analysis. In this paper we present the results of a pilot study where we show that we can measure Gd, quantitatively in vivo, in the lower leg muscle of 10 participants...
September 2014: Physiological Measurement
https://www.readbyqxmd.com/read/24688815/neurotoxic-effects-of-indocyanine-green-cerebellar-granule-cell-culture-viability-study
#18
Beata Toczylowska, Elzbieta Zieminska, Grazyna Goch, Daniel Milej, Anna Gerega, Adam Liebert
The aim of this study was to examine neurotoxicity indocyanine green (ICG). We assessed viability of primary cerebellar granule cell culture (CGC) exposed to ICG to test two mechanisms that could be the first triggers causing neuronal toxicity: imbalance in calcium homeostasis and the degree of oligomerization of ICG molecules. We have observed this imbalance in CGC after exposure to 75-125μΜ ICG and dose and application sequence dependent protective effect of Gadovist on surviving neurons in vitro when used with ICG...
March 1, 2014: Biomedical Optics Express
https://www.readbyqxmd.com/read/24365398/interference-of-gadolinium-based-contrast-agents-on-colorimetric-calcium-assays
#19
Ronald Yan, Heather Tarr, Martin McNally, Louis-Jacques Cartier, Yu Chen
OBJECTIVE: The aim of this study was to evaluate the potential interference of five gadolinium-based contrast agents (GBCAs), gadodiamide (Omniscan®), gadobenate dimeglumine (Multihance®), gadoxetate disodium (Primovist®), gadobutrol (Gadovist®), and gadoteridol (Prohance®), on three clinical laboratory widely used colorimetric calcium assays including the newly developed 5-nitro-5'methyl-l,2-bis(2-aminophenoxy)ethane-N,N,N',N'-tetraacetic acid (NM-BAPTA) method. METHODS: Plasma was collected from healthy volunteers aged 23-52, and spiked with varying concentrations of the five GBCAs...
May 2014: Clinical Biochemistry
https://www.readbyqxmd.com/read/24250860/the-relationship-between-enhanced-plaques-with-gadovist-and-magnevist-contrast-brain-magnetic-resonance-imaging-and-the-neurological-deficit-in-the-acute-phase-of-relapsing-remitting-multiple-sclerosis
#20
Mahboobeh Yaghoobi, Mohammad Hossein Harirchian, Kavous Firouznia, Somayeh Behzadi, Hassan Hashemi, Hossein Ghanaati, Madjid Shakiba, Amir Hossein Jalali, Shahrzad Mohebbi
BACKGROUND: Magnetic resonance imaging (MRI) is the standard method for observing brain plaques and contrast material injection is necessary for demonstrating the active plaque.This study compared the rate of enhancement of plaques with Gadovist and Magnevist in relapse phase of MS. METHODS: In this double blind study, after neurological examination of 62 patients in the attack phase of MS, two consecutive MRIs were performed with Gadovist and Magnevist with 48 hours interval...
2012: Iranian Journal of Neurology
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