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 ,[link widoczny dla zalogowanych], 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 ,[link widoczny dla zalogowanych], 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),[link widoczny dla zalogowanych], 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 ,[link widoczny dla zalogowanych], 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 ,[link widoczny dla zalogowanych], 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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