放射線診斷原理與技術學題庫下載題庫

(A)STIR ：抑制脂肪
(B)FLAIR ：抑制水
(C)Magnetization transfer technique ：

Magnetization transfer techniques are equally effective for both non-contrast and contast-enhanced MRA.  Because gadolinium (Gd) enhancement is caused by a water-Gd ion interaction (not macromolecular cross-relaxation), MT pulses suppress the signal from background tissues and render Gd-enhanced areas more conspicuous.

Time of flight MRA without (left) and with (right) MT suppression. Note better visualization of small vessels after MT pulse.

出處：http://mriquestions.com/magnetization-transfer.html

(D)FLASH ：Fast low a...

(A)STIR ：抑制脂肪
(B)FLAIR ：抑制水
(C)Magnetization transfer technique ：

Magnetization transfer techniques are equally effective for both non-contrast and contast-enhanced MRA.  Because gadolinium (Gd) enhancement is caused by a water-Gd ion interaction (not macromolecular cross-relaxation), MT pulses suppress the signal from background tissues and render Gd-enhanced areas more conspicuous.

Time of flight MRA without (left) and with (right) MT suppression. Note better visualization of small vessels after MT pulse.

出處：http://mriquestions.com/magnetization-transfer.html

(D)FLASH ：Fast low angle shot magnetic resonance imaging (FLASH MRI) is a particular sequence of magnetic resonance imaging. It is a gradient echo sequence which combines a low-flip angle radio-frequency excitation of the nuclear magnetic resonance signal (recorded as a spatially encoded gradient echo) with a rapid repetition time. It is the generic form of steady-state free precession imaging.