Magnetic resonance imaging apparatus and fluid-enhanced image acquisition method

摘要

In order to acquire an image with enhanced contrast between a fluid portion and a stationary portion without extending the imaging time even when an IR pulse is used as an RF pre-pulse, the RF pre-pulse is applied to a region upstream of an imaging region so as to excite longitudinal magnetization of the fluid portion in a negative direction, an echo signal is measured from the imaging region, and an image with enhanced contrast of the fluid portion with respect to the stationary portion is acquired on the basis of phase information of an image reconstructed by using the echo signal.

主权项

1. A magnetic resonance imaging apparatus comprising:
a measurement control unit configured to control measurement of an echo signal from an imaging region of an object to be examined including a fluid portion, on the basis of a predetermined pulse sequence; and an arithmetic processing unit configured to obtain an image with enhanced contrast between the fluid portion and a stationary portion using the echo signal, wherein: the pulse sequence is formed by an RF pre-pulse portion provided with an RF pre-pulse which performs labeling on the fluid portion by exciting the longitudinal magnetization of the fluid portion in a negative direction and a measurement sequence portion configured to measure an echo signal from the imaging region into which the labeled fluid portion is flown; and the arithmetic processing unit obtains a fluid-enhanced image with enhanced contrast between the fluid portion and the stationary portion based on phase information of the image, and wherein the measurement control unit performs labeling on the fluid portion by applying the RF pre-pulse to a region upstream from the imaging region, and executes the measurement sequence before the longitudinal magnetization of the labeled fluid portion is recovered to null or above, and wherein: the RF pre-pulse includes an IR pulse which excites the longitudinal magnetization at α(90<α<270)-degrees; and the measurement sequence portion includes a transverse magnetization generating RF pulse which generates transverse magnetization by exciting the longitudinal magnetization at β(0<β≦90)-degrees.