Gradient magnetic-field measuring method and MRI device
A technology of gradient magnetic field and measurement method, which is applied in the direction of measuring device, magnetic gradient measurement, magnetic performance measurement, etc., to achieve the effect of precise measurement
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no. 1 example -
[0038] Figure 4 Shown is a block diagram of an MRI apparatus according to a first embodiment of the present invention.
[0039] In the MRI apparatus 100, the magnet assembly 1 has a hollow part (hole) to insert a target object, and around the hollow part, there are provided a constant intensity H to the target. 0 A permanent magnet 1p for a static magnetic field, a gradient magnetic field coil 1g for applying gradient pulses, a transmitting coil 1t for applying RF pulses to excite spins of atomic nuclei in the target, and a receiving coil 1r for detecting NMR signals from the target. The gradient magnetic field coil 1g, the transmitting coil 1t, and the receiving coil 1r are connected to the gradient magnetic field drive circuit 3, the RF power amplifier 4, and the preamplifier 5, respectively.
[0040] It should be noted that superconducting magnets or ordinary conducting magnets can be applied instead of permanent magnets.
[0041] Sequence memory circuit 8 operates gradie...
no. 2 example -
[0064] The gradient magnetic field measurement pulse sequence B shown in FIG. 9 can be used to measure smaller samples (for example, a sphere with a diameter of 10 cm).
[0065] In the gradient magnetic field measurement pulse sequence B shown in Figure 9, since the sample is small, it is not necessary to select the slice, so no slice selection pulse (G in Figure 6 e ). Furthermore, since no rephasing pulse is required (G in Figure 1 r ), the precoded pulse P k Consists of code pulses only.
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