gradient echo การใช้

• The bright region in the gradient echo weighted image shows the area affected in this acute stroke example.
• Another example is MP-RAGE ( magnetization-prepared rapid acquisition with gradient echo ), which improves images of multiple sclerosis cortical lesions.
• To address this limitation, Kenneth Kwong, a postdoctoral fellow in the NMR Center, developed a means to measure endogenous signals based on blood oxygenation using gradient echo imaging.
• The generic FLASH technique emerges as a gradient echo sequence which combines a low-flip angle radio-frequency excitation of the NMR signal ( recorded as a spatially encoded gradient echo ) with a rapid repetition of the basic sequence.
• The generic FLASH technique emerges as a gradient echo sequence which combines a low-flip angle radio-frequency excitation of the NMR signal ( recorded as a spatially encoded gradient echo ) with a rapid repetition of the basic sequence.
• Application of field gradient destroys the FID signal, but this can be recovered and measured by a refocusing gradient ( to create a so-called " gradient echo " ), or by a radio frequency pulse ( to create a so-called " spin-echo " ).
• General Electric used the name SPGR ( Spoiled Gradient Echo ), and Philips uses the name CE-FFE-T1 ( Contrast-Enhanced Fast Field Echo ) or T1-FFE . Depending on the desired contrast, the generic FLASH technique provides spoiled versions that destroy transverse coherences and yield T1 contrast as well as refocused versions ( constant phase per repetition ) and fully balanced versions ( zero phase per repetition ) that incorporate transverse coherences into the steady-state signal and offer T1 / T2 contrast . FLASH was very rapidly adopted commercially.