US 3,932,805 AGranted

Method of obtaining internal information of a measuring target from the out-side by the application of a nuclear magnetic resonance phenomenon

AssigneeKichizo Niwa

InventorsZenuemon Abe, Kunio Tanaka, Masao Hotta, Masaaki Imai

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Abstract

This invention relates to a method of obtaining internal information of the body to be investigated (target) by the application to the target of a nuclear magnetic resonance phenomenon, in which the measuring target is placed in a homogeneous magnetic field Ho and a static or scanning magnetic field H.sub.s is superimposed on the homogenous magnetic field Ho within a specified area of the target; from the inside or outside thereof. A high frequency field H.sub.1 of a frequency determined by the static field H.sub.o +.DELTA.H.sub.s in the measuring target area (MT) is applied uniformly to the body thereby obtaining information of a nuclear magnetic substance disposed within the specified area of the body, i.e., the measuring target in accordance with detection of a resonance frequency defined by H.sub.o +.DELTA.H.sub.s. Alternatively, the scanning field .DELTA.H.sub.s may be applied to the body only outside of the target region and a resonance frequency defined by H.sub.o only then is detected as to the target MT. The high frequency field may be constant or pulsed.

Claims34

Dependent claims

A method of obtaining internal information of a specified area of a measuring target by use of a nuclear magnetic resonance phenomenon, including the steps of:

providing a homogeneous magnetic field H.sub.0,
disposing the measuring target in said homogeneous magnetic field,
generating a scanning magnetic field .DELTA.H.sub.s and applying said scanning magnetic field .DELTA.H.sub.s in superimposed relationship with said homogeneous magnetic field H.sub.0 to establish a level of field intensity in the specified area to be examined which differs substantially from the level of field intensity of the remaining portion of the measuring target,
providing a high-frequency magnetic field H.sub.1 of a resonance frequency of a nuclear magnetic substance in the measuring target area, said high-frequency being determined by the level of field intensity in the said target area, and applying the high-frequency magnetic field in a direction perpendicular to the field H.sub.0 so as to encompass at least said specified area of the measuring target and regions adjacent said specified area of said measuring target, to produce a signal representative of a nuclear magnetic substance in said specified area, and detecting and processing said signal for obtaining information of said nuclear magnetic substance of said specified area of said measuring target.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 05/387,138Filed 9 Aug 1973
Priority: JA 48-135082 Feb 1973
Granted: 13 Jan 1976
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

G01R 33/3808
Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field: magnet assemblies for single-sided MR wherein the…
G01F 1/716
Measuring the time taken to traverse a fixed distance: using electron paramagnetic resonance [EPR] or nuclear magnetic resonance [NMR]
G01R 33/445
Using nuclear magnetic resonance [NMR]: mR involving a non-standard magnetic field B0, e.g. of low magnitude as in the earth's magnetic field or…
G01R 33/48
Using nuclear magnetic resonance [NMR]: nMR imaging systems