señal de vacío de flujo
| 02:00 Aug 6, 2010 |
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| Spanish to English translations [PRO] Medical - Medical: Cardiology / MRI | |||||||
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| 3 | loss of streamline flow |
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| 3 | loss of fluid signal |
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| Discussion entries: 4 | |
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Answers
12 hrs confidence: 
loss of streamline flow Explanation: ...Los tiempos de relajación T1 de la sangre aumentan al subir la potencia del campo magnético, con esta potencia de campo, incluso, los hematíes empacados tienen un T1 más largo que la sustancia blanca, lo que produce un aspecto hipointenso… (En RM, el tiempo de relajación longitudinal se llama T1 y depende de la relación entre el protón y el medio que lo rodea -existen medios de distinta estructura molecular, viscosidad, etc.- El tiempo de relajación transversa se llama T2 y depende de la relación entre el protón y los protones vecinos.) Angioresonancia: (Tiempo de vuelo, inyección de contraste y contraste de fase). En un estudio de resonancia magnética convencional, la sangre NO da señal, a esto se le llama vacío de flujo… MAGNETIC RESONANCE ANGIOGRAPHY (MRA) MRA images optimally display areas of constant flow velocity, but there are many situations where the flow within a voxel has non-uniform speed or direction. The diagram opposite illustrates the streamlines of flow in the normal carotid bifurcation showing regions of reversed and crossed flow. In a diseased vessel these patterns are even more complex. Similar loss of streamline flow occurs at all vessel junctions and stenoses, and in regions of mural thrombosis. It results in a loss of signal, due to the loss of phase coherence between spins in the voxel. This effect must be considered when interpreting images or selecting technique. This signal loss, usually only noticeable distal to a stenosis, used to be an obvious characteristic of MRA images. It is now minimized by using small voxels and the shortest possible TE. Signal loss from disorganized flow is most noticeable in TOF imaging but also affects the PCA images... Best link for this case: http://www.users.on.net/~vision/papers/basicMRA/MRA_Intro.ht... Reference: http://www.mr-tip.com/serv1.php?type=db1&dbs=Spin%20Echo%20S... |
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1 hr confidence:
loss of fluid signal Explanation: http://www.rard.org.ar/numeros/2007_2/14vacio_flujo.pdf El “signo del vacío de flujo” del LCR consiste en la pérdida de señal, o hipointensidad, de las imágenes potenciadas en T2 que se produce en la porción posterior del tercer ventrículo de pacientes con hidrocefalia normotensiva. Estas pérdidas de señal son más evidentes en la proximidad al acueducto de Silvio ya que la velocidad del LCR durante la sístole y diástole pulsátil aumenta al reducirse la sección transversal del conducto (2,3). La extensión de la pérdida de señal desde el acueducto, tanto en sentido craneal hacia el tercer ventrículo como caudal hacia el cuarto, es proporcional a la velocidad del LCR en el plano de la adquisición. Su extensión representa, pues, una medida indirecta de la magnitud de la velocidad (Fig. 1). The Value of Enhanced Magnetic Resonance Imaging in the Evaluation ... by JL Hegarty - 2002 - Cited by 38 - Related articles 1, March 1998) and a follow-up. FSE T2 and gadolinium-T1 MRI was performed. The FSE. T2 in Figure 1 shows a loss of fluid signal intensity within ... www3.interscience.wiley.com/journal/121608544/articletext?DOI=10... How we do it: our approach to the ossified cochlea by G Williams - 2005 loss of fluid signal from the cochlear duct on the MRI. A fibrosed or ossifying cochlear may appear clear or 'fuzzy' on a CT scan but will also return no ... www3.interscience.wiley.com/journal/112473928/articletext?DOI=10... Hide more results from www3.interscience.wiley.comMAGNETIC RESONANCE IMAGING CHARACTERISTICS OF THE FOOT IN HORSES ...by RC Murray - 2006 - Cited by 32 - Related articles Magnetic resonance imaging (MRI) has the potential to ...... DSIL, with loss of fluid signal (adhesion) between the DSIL and deep digital ... www3.interscience.wiley.com/journal/118574907/articletext?DOI=10... IATROGENIC BRAINSTEM INJURY DURING CEREBELLOMEDULLARY CISTERN PUNCTUREby AL FELIU-PASCUAL - 2008 - Related articles ÃSigna MRI, General Electric Medical Systems, Milwaukee, WI. ... 4, C4/5, and C5/6 intervertebral discs have loss of fluid signal, bulging of the dorsal ... www3.interscience.wiley.com/journal/121390255/articletext?DOI=10... Show all results from www3.interscience.wiley.com » 3-T Imaging of the Cochlear Nerve and Labyrinth in Cochlear ... by JI Lane - 2004 - Cited by 51 - Related articles Loss of fluid signal intensity in the labyrinth, particularly in the semicircular canals, was encountered on 3D FRFSE images in one-half of the cases (Fig ... www.ajnr.org/cgi/content/full/25/4/618 3-T Imaging of the Cochlear Nerve and Labyrinth in Cochlear ... by JI Lane - 2004 - Cited by 51 - Related articles Note loss of fluid signal intensity in the SCC on one-half of the FRFSE images. Visualized endolymphatic ducts were all normal in caliber. ... www.ajnr.org/cgi/reprint/25/4/618.pdf - Similar Show more results from www.ajnr.org MRI atlas: orthopedics and neurosurgery : the spine - Google Books ResultMartin Weyreuther, Christoph E. Heyde, Michael Westphal - 2007 - Medical - 295 pages Axial T2-weighted image through the L3-4 level showing nearly complete loss of fluid signal at this level, consistent with severe spinal stenosis ... books.google.com/books?isbn=3540335331... Systematic Approach to Interpretation of the Lumbar Spine MR ... by JQ Ly - 2007 - Cited by 2 - Related articles Jun 26, 2007 ... These early signs may include loss of fluid signal within the nucleus pulposis .... of a new MRI classification system, Spine 27 (2002), pp. ... linkinghub.elsevier.com/retrieve/pii/S1064968907000554 -------------------------------------------------- Note added at 16 horas (2010-08-06 18:33:52 GMT) -------------------------------------------------- Rita, it seems that "signal" may be better than sign. Flow void signal seems right. [PDF] Magnetic resonance imaging flow void changes after cerebrospinal ... File Format: PDF/Adobe Acrobat - Quick View by PMMMR Formisano - 2006 - Cited by 3 - Related articles post-traumatic hydrocephalus and a fast flow-void signal in .... because of the persistence of fast flow-void signal and the ... www.e-flanc.net/.../MRI Flow Void Changes after Cerebrospin... Magnetic resonance imaging flow void changes after cerebrospinal ... by P Missori - 2006 - Cited by 3 - Related articles ... or clinical suspicion of post-traumatic hydrocephalus and a fast flow-void signal in the cerebral acqueduct on T2-weighted and proton density MRI. ... www.ncbi.nlm.nih.gov/pubmed/16775744 Chiari malformation with compression of the medulla oblongata by ... by T Kobayashi - 1992 - Cited by 13 - Related articles Apr 1, 2009 ... The cerebellar tonsil leading to the foramen magnum as well as a flow-void signal suggesting compression of the medulla by the vertebral ... thejns.org/doi/full/10.3171/jns.1992.77.2.0307 Syndromes of Pontine Base Infarction : A Clinical-Radiological ... by JS Kim - 1995 - Cited by 63 - Related articles However, 2 (patients 17 and 20) had diffuse stenosis or occlusion of the internal carotid arteries. None had abnormal basilar artery flow void signal. ... |
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