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  • tumors occur
  • It is interesting that according to where tumors occur in the brainstem usually indicates what their histology and behavior is. (clinicaltrials.gov)
  • [ 1 ] These tumors occur more commonly as sporadic isolated lesions (70-80% of cases) rather than as multiple lesions in the cerebellum and retina as part of the dominantly inherited familial cancer syndrome, von Hippel-Lindau disease (16-25% of cases). (medscape.com)
  • Lesions
  • MRI features largely depend on the proportion of fat and vascularity of the lesions. (scribd.com)
  • Extraosseous components tend not to show high signal intensity on T1-weighted images owing to the paucity or absence of adipose tissue, but avid enhancement occurs with gadolinium enhancement owing to the vascularity of the lesions. (scribd.com)
  • A papillary-type lesion can be missed on MRI or CT when no characteristic cystic component is present or when lesions are not enhanced after the administration of intravenous (IV) contrast material (as occurs in approximately 10% of patients). (medscape.com)
  • contrast
  • The disease has occurred in patients with moderate to end-stage renal disease after being given a gadolinium-based contrast agent to enhance MRI or MRA scans. (scribd.com)
  • functional
  • Given that both the severity of the deficit and the successful rehabilitation process depend on the anatomical pathways that have been altered in the spinal cord, it may be of great interest to assess white matter integrity after a spinal lesion and to evaluate quantitatively the functional state of spinal neurons. (umontreal.ca)
  • nuclei
  • MRI depends on the collective, or net, magnetic effect of a large number of nuclei within a specific voxel of tissue. (sprawls.org)
  • In the absence of a magnetic field, the nuclei are randomly oriented and produce no net magnetic effect. (sprawls.org)
  • The magnetization of tissue produced by the alignment of magnetic nuclei (protons) in a magnetic field. (sprawls.org)
  • 3 Patients whose past infection has resolved are HBsAg-negative with positive anti-HBs and/or anti-HBc, although cccDNA may remain in hepatocyte nuclei 3,18 (with the patient becoming serum HBsAg-positive again) or HBV viremia may occur under severe immune suppression, as is seen with rituximab therapy or after stem cell transplant. (nih.gov)
  • stroke
  • Altogether, our results suggest that when SSIL occur, the presence of stroke symptoms may depend on sex and alterations of the surrounding brain tissue rather than on the characteristics of the SSIL itself. (ovid.com)
  • protons
  • Based on the behavior of protons when placed in a strong magnetic field, which is interpreted and transformed into images by magnetic resonance (MR) instruments. (drugbank.ca)
  • Important advantages of this technique are its noninvasiveness (since magnetically labeled protons in blood are used as a tracer) and short acquisition time at high magnetic field strengths (3.0 T) [ 18 ]. (hindawi.com)
  • severe
  • Hypersensitivity: anaphylactic/anaphylactoid reactions with cardiovascular, respiratory and cutaneous manifestations, ranging from mild to severe reactions including shock can occur. (nih.gov)
  • Acute renal injury occurs commonly after surgery, severe infection, injury, or drug-induced renal toxicity. (pdr.net)
  • GBCAs
  • Nephrogenic Systemic Fibrosis has occurred in patients with impaired elimination of GBCAs. (nih.gov)
  • cardiac
  • Notices must be posted where appropriate to warn staff of the presence of the magnetic field and of the possibility that it may affect the functioning of cardiac pacemakers and other electronic or metal equipment. (warwick.ac.uk)
  • signal
  • The probe and the resonance signal each have a respective, corresponding Q, and the ratio, Q′, of the Q of the probe to the Q of the resonance signal is relatively large. (google.com)
  • The present invention relates to a probe for detecting a transient magnetic resonance signal induced in a sample, wherein the ratio of the Q of the probe to the Q of the resonance signal is relatively large, and preferably larger than 1. (google.com)
  • Therefore, the induced magnetic resonance signal can be detected to thereby indicate the presence of the specific substance. (google.com)
  • density
  • Whole-body time-weighted exposure to magnetic flux density (averaged over 24 hours) in should not exceed 200mT. (warwick.ac.uk)
  • In air, the effects on small metallic objects are of little consequence where the magnetic flux density is less than 3mT. (warwick.ac.uk)
  • Magnetic field flux density gradient 'maps' should be created by taking field strength measurements and marking lines around the source (e.g. tape or draw lines on the floor). (warwick.ac.uk)
  • pulse
  • It will remain in this state until the magnetic field is changed or until the magnetization is redirected by the application of an RF pulse. (sprawls.org)
  • presence
  • In a hydrogen NMR spectrum, the presence of any resonance explains first that the molecule of study contains hydrogen. (encyclopedia.com)
  • The presence of an isolated anti-HBc test result usually signifies infection with HBV in the past with subsequent loss of anti-HBs and occurs in 7% to 19% of HIV-infected patients. (nih.gov)
  • central nervou
  • These deficits evolve in time as reorganisation of the central nervous system occurs, involving physiological and neurochemical mechanisms that are still not fully understood. (umontreal.ca)
  • time
  • 2. Guidelines for limiting exposure to time-varying electric, magnetic and electromagnetic fields (up to 300GHz). (warwick.ac.uk)
  • greater
  • Pacemaker interference is unlikely to occur if wearers are not exposed to static magnetic flux densities greater than 0.5mT over the region of the trunk. (warwick.ac.uk)
  • patients
  • As part of an effort to develop minimally invasive surgical techniques with a potentially improved safety profile, magnetic resonance-guided laser interstitial thermal therapy (MRgLITT) has emerged as a viable treatment option for some patients with medically refractory epilepsy. (jkns.or.kr)
  • data
  • Corruption / loss of information stored on magnetic business cards, data storage devices and some wristwatches. (warwick.ac.uk)