 Wysłany: Sob 11:54, 12 Mar 2011 Temat postu: Advance and FLAIR sequences in the spinal cord Ima |
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| Advance and FLAIR sequence imaging of the spinal cord
Underwent injection of contrast agent to several rounds of scanning , dynamic observation of the blood supply of organs and lesions ,tory burch outlet, as well as the relationship between lesions and large vessels , abdominal organs have been widely used , especially in the diagnosis of focal liver lesions . In recent years, dynamic contrast-enhanced MR scans are used for pancreatic cancer detection ,mbt scarpe outlet, characterization and evaluation of local invasion . Now relevant foreign literature are summarized below. First, dynamic contrast-enhanced MR scanning inspection method using fast multi-plane damage gradient back to the return wave series (fastmultiplannarspoiledgradient-recalledsequence, referred to as FMSPGR or SPGR). Also known as FLASH ({astlow-angleshot),adidas scarpe, are fast gradient echo sequence ; short TR makes scanning faster than spin echo sequence (SE) significantly increased, while use of 2D multi- loop structure (twodimensionmultisectionloopstructure). All levels of the signals collected for each TR ,keen shoes sale, the process can be completed in one breath from the diaphragm top to the bottom of all aspects of pancreatic scanning . Multi-layer circuit structure inspection time T = TR × NEX × number of phase encoding ,UGG boots Italia, dynamic enhanced MRI using an acquisition. The main decision is the TR scan time and the number of phase encoding , and a short TR scan and limit the level of coverage , and therefore , in order to cover the course in one breath-hold liver and pancreas, is bound to reduce the number of phase encoding (phaseencodingsteps), produce non- square Pixel spatial resolution at the expense It 】 . To overcome the short TR due to residual transverse magnetization (residualtransversemagnetization) effects . TR front of each gradient pulse (gradientpulse) to interfere with or crushed (spoilorcrush) residual transverse magnetization Sichuan Shanghai Medical University, Zhongshan Hospital Radiology |
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