Magnetic resonance image forming equipment
A technology of magnetic resonance imaging and equipment, applied in the fields of medical science, sensors, diagnostic recording/measurement, etc., can solve problems such as the inability to improve the reproducibility of blood vessels, and achieve the effect of improving reproducibility and CNR.
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no. 1 example
[0060] figure 1 is a block diagram showing the MRI apparatus according to the first embodiment.
[0061] In the MRI apparatus 100, the magnet assembly 1 has an inner hole (cavity portion) for inserting a research object (subject) therein, and is provided around the inner hole: inclined coils (including X-axis, Y-axis and Z-axis) Axis coils, and combinations thereof, define slice, warp, and readout axes) 1G for generating tilted magnetic fields; transmit coils 1T for applying RF pulses to stimulate rotation of nuclei within the subject; receive coils 1R , for detecting NMR signals from the research object; and the static magnetic field power supply 2 and the static magnetic field coil 1C, for generating the static magnetic field.
[0062] It should be noted that a permanent magnet may be used instead of the static magnetic field power source 2 and the static magnetic field coil 1C (superconducting coil).
[0063] The tilt coil 1G is connected to a tilt coil drive circuit 3 . ...
no. 2 example
[0095] In the second embodiment, as Figure 8 The window functions shown are used to implement windowing.
[0096] exist Figure 8 The window function f(k) in has a value of 0.5 at the center of k-space, increases to a value of 1 as it moves away from the center, remains at 1 for a while, and increases from near the periphery of k-space to Periphery, reduced to a value of 0.5.
[0097] In the region where its value increases from 0.5 to 1, the window function f(k) is expressed as:
[0098] f(k)=1-A·exp{-|k| 2 / a 2},
[0099] where a and A are constants and k is the distance from the center.
[0100] In the region where the values decrease from 1 to 0.5, the window function f(k) is expressed as:
[0101] f(k)=1 / (1+exp{(|k|-R) / b}),
[0102] where b and R are constants and k is the distance from the center.
[0103] The window function f(k) over the entire k-space is defined by surrounding Figure 8 The axis of rotation at the center r...
no. 3 example
[0106] In a third embodiment, a three-dimensional MR image is generated with improved reproducibility of the blood vessel V.
[0107] Figure 9 is a flowchart showing three-dimensional MR image generation processing according to the third embodiment.
[0108] In step Q1, an MR image is generated according to one of the above-described embodiments, and the generation process is repeated for a plurality of slices arranged consecutively in the thickness direction.
[0109] In step Q2, three-dimensional data is generated from MR images of a plurality of slices serially arranged in the thickness direction.
[0110] In step Q3, MIP (maximum intensity projection, maximum intensity projection) processing is performed on the 3D data to generate a 3D MR image.
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