dict.cc | Übersetzungen für 'arterial spin labelling' im Englisch-Deutsch-Wörterbuch, mit echten Sprachaufnahmen, Illustrationen, Beugungsformen,. Englisch-Deutsch-Übersetzungen für arterial spin labeling im Online-Wörterbuch dict.cc (Deutschwörterbuch)
Arterial spin labeling (ASL), also known as arterial spin tagging, is a magnetic resonance imaging technique used to quantify cerebral blood perfusion by labelling blood water as it flows throughout the brain In this study, we investigate if increased blood flow within meningiomas seen on arterial spin-labeling (ASL) MRI correlates with increased tumor vascularity seen on digital subtraction angiography (DSA). MATERIALS AND METHODS. A retrospective study was performed of 39 meningiomas in 34 patients who underwent ASL MRI and DSA between January 2008 and January 2017. Two raters independently. . Sie sind auf der linken Seite unten aufgeführt. Bitte scrollen Sie nach unten und klicken Sie, um jeden von ihnen zu sehen. Für alle Bedeutungen von ASL klicken Sie bitte auf Mehr. Wenn Sie unsere englische Version besuchen und Definitionen von Arterielle Spin Labeling in anderen Sprachen sehen möchten, klicken Sie bitte auf das. BACKGROUND AND PURPOSE: Three-dimensional pseudocontinuous arterial spin labeling with multiple postlabeling delays has been used to assess cerebral blood flow (CBF). We used this modality to estimate antegrade and collateral flow in patients with unilateral middle cerebral artery stenosis. METHODS: Consecutive patients with unilateral middle cerebral artery 50% to 99% stenosis at 2 centers.
Arterial spin labeling (ASL) is a form of perfusion imaging without exogenous contrast administration, using paramagnetic labeling of water in blood flowing to the brain and thus requires no exogenous contrast administration to produce measurements that are proportional to cerebral blood flow (CBF) Unfortunately, the arterial spin labeling (ASL) image, which is an important fMRI indicator in dementia diseases diagnosis nowadays, has never been comprehensively investigated for the synthesis purpose yet. In this paper, ASL images have been successfully synthesized from structural magnetic resonance images for the first time Introduction. Arterial spin labeling (ASL) is a magnetic resonance (MR) imaging technique that enables the measurement of brain perfusion noninvasively at the tissue level.Benefiting from the contrast of inflowing magnetically labeled blood, ASL obviates an exogenous contrast agent. Although the principle of ASL was introduced in early 1990s (1-3) and is feasible on low-field-strength MR.
Introduction: Flow driven adiabatic inversion (1) has been used to continuously label arterial blood for arterial spin labeling perfusion and angiography studies. Continuous ASL (2) produces the largest ASL signal change, potentially the greatest SNR, and can be advantageous for other reasons as well. Continuous labeling has drawbacks, however. It requires near continuous wave RF transmit. Arterial spin labelling (ASL) employs magnetically labelled endogenous arterial blood water to quantify cerebral perfusion. ASL can also measure arterial arrival time (AAT), the time taken for blood to travel from the labelling slab to the tissue of interest (Wang et al., 2003; Zappe et al., 2007).. With pulsed labeling techniques (PASL: Pulsed Arterial Spin Labeling), a volume of blood is labeled upstream of the region of interest by a short RF pulse. Signal acquisition is carried out after a delay TI (of 1 to 2 seconds). The difference in signal between measurements with and without spin labeling reflect the amount of labeled blood arriving in the volume of interest during the delay TI.
Arterial Spin Labeling (ASL) A MR image can be sensitized to the effect of inflowing blood spins if those spins are in a different magnetic state to that of the static tissue. Techniques known as ASL techniques uses this idea by magnetically labeling blood flowing into the slices of interest. Contrast agents are not required for these techniques Arterial-Spin Labeling (ASL) Labeled spins in arterial blood water act as an endogenous tracer At the time of imaging, tagged spins have arrived in the regions of interest Water is exchanged between blood and tissue --- resulting tissue longitudinal relaxation (T 1) is proportional to flow CASL: continuous AS Background and objectives: Determining the occlusion site and collateral blood flow is important in acute ischemic stroke. The purpose of the current study was to test whether arterial spin labeling (ASL) magnetic resonance imaging (MRI) could be used to identify the occlusion site and collateral perfusion, using digital subtraction angiography (DSA) as a gold standard
Background and purpose: To compare the diagnostic performance of arterial spin-labeling (ASL) and dynamic susceptibility contrast (DSC) perfusion in detecting cerebral blood flow (CBF) changes before and after endovascular recanalization in acute ischemic syndrome. Methods: The inclusion criteria for this retrospective study were patients with acute ischemic syndrome who underwent endovascular. Arterial spin-labeling (ASL) is a technique that has been around for a number of years but which remained dormant until recent enthusiasm developed again about its use and, finally, acceptance came over the last few years. From the start it was, in theory, a revolution: obtaining perfusion images with MR without the use of contrast media Comparison of arterial spin labeling registration strategies in the multi-center GENetic frontotemporal dementia initiative (GENFI). Mutsaerts HJMM(1)(2), Petr J(3), Thomas DL(4), De Vita E(4), Cash DM(4), van Osch MJP(5), Golay X(4), Groot PFC(2), Ourselin S(6), van Swieten J(7), Laforce R Jr(8), Tagliavini F(9), Borroni B(10), Galimberti D(11), Rowe JB(12), Graff C(13), Pizzini FB(14. Arterial spin labeling is used for differentiation of brain tumors from nonneoplastic lesions such as infarction and infection. It has a role in the grading of gliomas and in the differentiation of gliomas from lymphomas and metastasis. It is used for detection of the best biopsy site and prediction of treatment response
Die Messung der Perfusion mittels CASL (continuous arterial spin labeling) in einem 3-Tesla-Magnetom liefert magnetresonanz-tomografische Daten von erheblich verbesserter örtlicher und zeitlicher Auflösung im Vergleich zu früher angewandten Verfahren ohne separate Labeling-Spule . 1, 2, 3 Though ASL has been in the research realm for long, continuing technological improvements in ASL methodology and MRI scanners with improvements in post processing have been vital in increasing its popularity and use in numerous clinical applications and research. 3, 4, Arterial spin labeling is commonly used to measure cerebral blood flow (CBF). Since CBF signal is intrinsically low, optimization of the signal-to-noise ratio (SNR) is critical. CASL with a separate labeling coil has the advantages of increased SNR, multi-slice capability, and absence of magnetization transfer. Here, we report the development of CASL for use on monkeys. Increased sensitivity. If you are visiting our non-English version and want to see the English version of Arterial Spin Labeling, please scroll down to the bottom and you will see the meaning of Arterial Spin Labeling in English language. Keep in mind that the abbreviation of ASL is widely used in industries like banking, computing, educational, finance, governmental, and health. In addition to ASL, Arterial Spin. 1.2.3 Perfusions-Bildgebung mit Arterial Spin Labeling 10 1.2.4 Andere Verfahren zur Perfusionsbildgebung 15 1.3 Fragestellung 16 2 MATERIAL UND METHODEN 18 2.1 Studienmodell 18 2.2 Patienten der Studie 18 2.3 MRT-Messprotokoll 19 2.4 Auswertung der MRT-Perfusionsmessungen 20 2.4.1 Auswertung der DSC-Perfusion 20 2.4.2 Auswertung der ASL-Zeitserien 21 2.5 Statistische Auswertung 24 3.
Arterial spin labeling (ASL) magnetic resonance imaging (MRI) enables measurement of quantitative CBF without the need for contrast agents and can be acquired in the acute stroke setting. 5 ASL differs from the more commonly applied contrast-enhanced methods with MRI or computed tomography (CT) perfusion-weighted imaging, which do not routinely provide quantitative CBF information, instead providing relative measurements Effekte lang anhaltender, willkürlicher Hyperventilation auf Blutgase, Hirnperfusion und Bewusstsein : Eine funktionelle Magnetresonanztomographie-Studie mit Arterial-Spin-Labeling-Technik Effects of prolonged intentional hyperventilation on blood gases, cerebral perfusion and consciousness : A functional magnetic resonance imaging study using arterial spin labeling techniqu Arterial spin labeling exploits the fact that unsaturated protons entering saturated tissue shorten the tissue T1. 28-31 Using appropriate electrocardiogram (ECG)-triggered pulse sequences, T1 measurements are performed after global and slice-selective spin preparation. Absolute tissue perfusion is then calculated by assuming a two-compartment model. It should be kept in mind that this.
To date, several studies demonstrated that Arterial Spin Labeling is a reliable tool to accurately and non-invasively analyze brain perfusion, facilitating the understanding of normal and pathological mechanisms underlying neonatal brain maturation and injury Arterial Spin Labeling. ASL is the only MR perfusion technique which does not rely on the use of intravenous contrast. Instead, it uses radiofrequency pulses to magnetically label protons in the blood which then act as an endogenous tracer. After this magnetic labeling, a chosen length of time known as the postlabeling delay gives the labeled blood adequate time to reach the brain parenchyma. Arterial spin labeling (ASL) techniques accomplish the same goal as microsphere studies by manipulating — in a noninvasive way — the magneti-Center for Functional MRI, University of California, San Diego, La Jolla, California, USA. Contract grant sponsor: NIH; Contract grant numbers: NS-36722, NS-042069. *Address reprint requests to: R.B.B., Center for Functional MRI, Uni-versity of.
. Poster presented at 93. Deutscher Röntgenkongress der DRG, Hamburg, Germany Arterial Spin Labeling (ASL) is a popular non-invasive neuroimaging technique to use MRI for quantitatively Cerebral Blood Flow (CBF) mapping. However, ASL usually suffers from poor signal quality and repeated measurements are typically acquired to improve signal quality through averaging at the cost of long scan time http://www.einstein.yu.edu - The fifty-fourth chapter of Dr. Michael Lipton's MRI course covers Arterial Spin Labeling. Dr. Lipton is associate professor rad..
If you are visiting our non-English version and want to see the English version of Arterial Spin Labeling, please scroll down to the bottom and you will see the meaning of Arterial Spin Labeling in English language. Keep in mind that the abbreviation of ASSAULT is widely used in industries like banking, computing, educational, finance, governmental, and health. In addition to ASSAULT, Arterial. Arterial blood labeling is achieved by a combination of RF pulses and gra- dientsinordertoinvertthelongitudinalmagnetisation(T1)of blood water protons. After the PLD, the image acquisition phase starts to obtain signal from those labeled protons coming from the feeding arteries into the tissue. Different types of readout can be employed Arterial spin labelling (ASL) MR perfusion is an MR perfusion technique which does not require intravenous administration of contrast (unlike DSC perfusion and DCE perfusion).Instead it exploits the ability of MRI to magnetically label arterial blood below the imaging slab. The parameter most commonly derived is cerebral blood flow (CBF).. It is a non-invasive and non-ionising MRI technique. Arterial spin labeling (ASL) is a noninvasive magnetic resonance imaging (MRI) technique used to assess brain perfusion quantitatively in humans. Many studies have reported the safety and utility of ASL in acute ischemic stroke (AIS); however, few reports have investigated the clinical significance of arterial transit artifact (ATA) in AIS. In. Arterial spin labeling (ASL) permits quantiﬁcation of tissue per-fusion without the use of MR contrast agents. With standard ASL techniques such as ﬂow-sensitive alternating inversion recovery (FAIR) the signal from arterial blood is measured at a ﬁxed inversion delay after magnetic labeling. As no image in-formation is sampled during this delay, FAIR measurements are inefﬁcient and.
- ASL(Arterial Spin Labeling) 法を用いた非造影MRAについて - 座長 青森市民病院 診療放射線部 . 古山 智明(Koyama Tomoaki) 一昨年・昨年に引き続き、非造影MRAをテーマとしました。今回はASL(Arterial Spin Labeling)の手法を 用いた非造影MRAとしてTime-SLIP(Time-Spatial Labeling inversion Pulse)法（東芝メディカルシステム. Arterial Spin Labeling at 1.5 and 4.0 Tesla Jiongjiong Wang,1,2 David C. Alsop,5 Lin Li,4 John Listerud,3 Julio B. Gonzalez-At,2 Mitchell D. Schnall,1 and John A. Detre1,2* High-ﬁeld arterial spin labeling (ASL) perfusion MRI is appealing because it provides not only increased signal-to-noise ratio (SNR), but also advantages in terms of labeling due to the increased relaxation time T 1 of. FDG-PET and arterial spin-labeling were equally sensitive in detecting tumor progression (83%). However, the specificity of arterial spin-labeling was superior to that of the other modalities (100%, 75%, and 50%, respectively). A combination of modalities did not augment the sensitivity, specificity, positive predictive value, or negative predictive value of arterial spin-labeling. CONCLUSIONS. Arterial spin labeling (ASL), also known as arterial spin tagging, is a magnetic resonance imaging technique used to quantify cerebral blood perfusion by labelling blood water as it flows throughout the brain. ASL specifically refers to magnetic labeling of arterial blood below the imaging slab, without the need of gadolinium contrast, which is the first of its kind in terms of perfusion imaging ARTERIAL SPIN LABELING (ASL) Matthias van Osch, Associate Professor C.J. Gorter Center for high field MRI, Dpt of Radiology Leiden University Medical Center The Netherlands Quantification of ASL 2 23 October 20132 Contents • Introduction on perfusion • Acute stroke, reactivity, flow territory mapping • Introduction of arterial spin labeling MRI • Pulse-sequences • Image readout.
dict.cc | Übersetzungen für 'arterial' im Englisch-Deutsch-Wörterbuch, mit echten Sprachaufnahmen, Illustrationen, Beugungsformen,. Introduction Arterial transit time is a parameter unique to arterial spin labeling (ASL), and it refers to the time needed for labeled spins to travel from the label region to the imaging region. Traditional ASL experiments focus on cerebral blood flow quantification and therefore do not provide transit time information. However, knowledge of transit time can aid detection of collateral flow.
Deutsch English. A novel dementia diagnosis strategy on arterial spin labeling magnetic resonance images via pixel-wise partial volume correction and ranking ; Publikationstyp: Zeitschriftenartikel: Autor/innen: Huang, Wei; Zhang, Peng; Shen, Minmin: Erscheinungsjahr: 2016: Erschienen in: Multimedia Tools and Applications ; 75 (2016), 4. - S. 2067-2090. - ISSN 1380-7501. - eISSN 1573-7721: DOI. degrees, arterial spin labeling is achieved by a labeling RF pulse of length TL. According to this scheme, labeling of the arterial spins can be done with a duty-cycle k 5 TL/TR. If TL is not too short compared to TR, the duty-cycle k is high enough to preserve the sensitivity of the continuous ASL technique. Since RF pulses are rapidly repeated to obtain high temporal resolution, the flip. Arterial spin labelling. Arterial spin labelling (ASL) has the advantage of not relying on an injected contrast agent, instead inferring perfusion from a drop in signal observed in the imaging slice arising from inflowing spins (outside the imaging slice) having been selectively saturated. A number of ASL schemes are possible, the simplest being flow alternating inversion recovery (FAIR) which. Arterial Spin Labeling sequences are widely spread in the research community. Nevertheless, to become a clinical standard it is crucial that vendors provide sequences that can be used for. BACKGROUND AND PURPOSE: Intracranial dural arteriovenous fistulas carry a risk of substantial neurologic complications but can be difficult to detect on structural MR imaging and TOF-MRA. The purpose of this study was to assess the accuracy and added value of 3D pseudocontinuous arterial spin-labeling MR imaging for the detection of these lesions
Arterial spin labeling-derived rCBF values weakly correlated with DCE-derived rCBF values, whereas these did not show correlation in normal grey (P = 0.12, r = 0.2) and white (P = 0.26, r = 0.14) matter regions. Conclusions Three-dimensional pseudocontinuous arterial spin labeling does not appear to be a reliable technique in the current form and may not be a suitable replacement for DCE in. Superselective arterial spin labeling imaging precisely depicted the revascularization territory in patients with moyamoya disease who underwent bypass surgery, and it showed the changes in the vascular supplying territories before and after bypass surgery
A 53-year-old chronic uncontrolled diabetic patient presented with one episode of generalized seizures followed by drowsiness and post-ictal confusion. MR imaging at admission revealed left temporal subcortical T2/FLAIR hypointensities with overlying cortical T2/FLAIR hyperintensities and increased perfusion on arterial spin labeling (ASL) Th 1835. New Approach of Non-invasive Perfusion Imaging Using Arterial Spin Labelling: Inflow Turbo-Sampling EPI-FAIR (ITS-FAIR), M. Günther, M. Bock and L.R. Schad, Deutsches Krebsforschungszentrum (DKFZ), Heidelberg, Germany. M 1836
Arterial spin labeling (ASL) is a completely noninva-sive magnetic resonance imaging (MRI) method that uses magnetically labeled blood water as a ﬂow tracer, providing CBF images of the brain. Moreover, if cer-tain conditions are met it can potentially also provide an absolute, quantiﬁable CBF measurement on a voxel-by-voxel basis (2). Knowledge of the perfusion characteristics of brain. Arterial spin labeling (ASL) is an MRI technique that was first proposed a quarter of a century ago. It offers the prospect of non-invasive quantitative measurement of cerebral perfusion, making it potentially very useful for research and clinical studies, particularly where multiple longitudinal measurements are required. However, it has suffered from a number of challenges, including a. . Medical » Laboratory. Add to My List Edit this Entry Rate it: (1.71 / 10 votes) Translation Find a translation for in other languages: Select another language: - Select - 简体中文 (Chinese - Simplified) 繁體中文 (Chinese - Traditional) Español (Spanish) Esperanto (Esperanto) 日本語 (Japanese) Português (Portuguese) Deutsch (German. Arterial spin labeling revealed hypoperfusion in children with ASD in regions critical to social perception and cognition. The left fusiform gyrus plays an important role in facial recognition, and greater CBF in this region was correlated with more normative facial recognition performance in children with ASD. This study takes an important first step in establishing CBF of the temporal lobes. Status of Arterial Spin Labeling for the fBIRN Thomas T' Liu UCSD Center for Functional MRI - adjusts measured BOLD signal based on baseline CBF measured using Work to make compatible with the BIRN processing pipeline. T.T. Liu, fBIRN AHM 2006 | PowerPoint PPT presentation | free to view . BOLD Calibration: Arterial Spin Labeling (ASL) Measurement of CBF - Cerebral Blood Flow (CBF.
Arterial spin-labeling (ASL) is capable of demonstrating hyperperfusion in a clinical population. Our clinical imaging experience has shown that ASL is very sensitive to pathologic states manifesting as focal, regional, and global hyperperfusion. With the availability of fully postprocessed ASL cerebral blood flow (CBF) maps at our institution within minutes of acquisition, timely assessment. Key Words: magnetic resonance imaging arterial spin labeling territorial ASL digital subtraction angiography atherosclerosis cerebrovascular accident collateral circulation I n patients with cerebrovascular steno-occlusive disease, the presence of collateral circulation is essential to main-tain cerebral perfusion, metabolism, and function. Many studies have shown the importance of an adequate.
Arterial spin-labeling (ASL) is a noninvasive MR imaging method to evaluate cerebral perfusion that does not require injection of any exogenous contrast agent or tracers. 7 Instead, it uses endogenous arterial water labeled by radiofrequency pulses as a freely diffusible tracer. Therefore, there is no radiation exposure with ASL. In addition, ASL is beneficial in terms of resource allocation. . December 2010; RöFo - Fortschritte auf dem Gebiet der R 182(12) DOI: 10.1055/s-0030-1268267. Authors: Lukas Scheef. 39.95; Hochschule Koblenz; Marcel Daamen. Arterial Spin Labeling (Tagging) ! Inflowing Blood Spins are Inverted or Saturated Before Entering the Slice ! Imaging is performed after a delay time that allows labeled blood to flow into tissue ! Tagged Image is Subtracted from Control Image with No Tagging . Imaging Slice! Arterial Tagging! Plane! Continuous Adiabatic Inversion Geometry Control Inversion ! Plane ! t Single Slice. ASL Methods 3D Volume Acquisition - Overcome SAR (specific absorption rate) - Whole Brain Coverage - Low Magnetization Transfer (MT) effects THE DIFFERENCE IN MAGNETIZATION BETWEEN CONTROL AND TAG IMAGE IS PROPORTIONAL TO REGIONAL CEREBRAL BLOOD FLOW. METHOD EFFICIENCY ASL step
Perfusion MRI without contrast media injection is possible using Arterial Spin Labeling (ASL) sequence. ASL is highly suitable for neonates, noninvasiveness, and lasts only 5 minutes. However, only one study assessed ASL as a prognostic factor. The purpose of the study is therefore to perform ASL sequence within usual care brain MRI arterial spin labeling asl definition in English dictionary, arterial spin labeling asl meaning, synonyms, see also 'arterial varix',arterially',arterialise',arterialize'. Enrich your vocabulary with the English Definition dictionar Arterial Spin Labelling Magnetic Resonance Imaging of the Brain: Techniques and Development Ph.D Thesis Jack Anthony Wells1,2 1The Advanced Magnetic Resonance Imaging Group Department of Medical Physics and Bioengineering 2 Radiology and Physics Unit UCL Institute of Child Health University College London Supervisors Dr. David Thomas1,2 Prof. Roger Ordidge1 Perhaps no other organ of the.