Point sensitive NMR imaging system using a magnetic field configuration with a spatial minimum
- El Cerrito, CA
A point-sensitive NMR imaging system (10) in which a main solenoid coil (11) produces a relatively strong and substantially uniform magnetic field and a pair of perturbing coils (PZ1 and PZ2) powered by current in the same direction superimposes a pair of relatively weak perturbing fields on the main field to produce a resultant point of minimum field strength at a desired location in a direction along the Z-axis. Two other pairs of perturbing coils (PX1, PX2; PY1, PY2) superimpose relatively weak field gradients on the main field in directions along the X- and Y-axes to locate the minimum field point at a desired location in a plane normal to the Z-axes. An RF generator (22) irradiates a tissue specimen in the field with radio frequency energy so that desired nuclei in a small volume at the point of minimum field strength will resonate.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- DOE Contract Number:
- W-7405-ENG-48
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Number(s):
- US 4556848
- OSTI ID:
- 865694
- Country of Publication:
- United States
- Language:
- English
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nmr
imaging
magnetic
field
configuration
spatial
minimum
point-sensitive
10
main
solenoid
coil
11
produces
relatively
strong
substantially
uniform
pair
perturbing
coils
pz1
pz2
powered
current
direction
superimposes
weak
fields
produce
resultant
strength
desired
location
z-axis
pairs
px1
px2
py1
py2
superimpose
gradients
directions
x-
y-axes
locate
plane
normal
z-axes
rf
generator
22
irradiates
tissue
specimen
radio
frequency
energy
nuclei
volume
resonate
nmr imaging
uniform magnetic
field gradient
field gradients
desired location
plane normal
relatively strong
radio frequency
magnetic field
substantially uniform
field strength
relatively weak
frequency energy
rf generator
tissue specimen
solenoid coil
field configuration
sensitive nmr
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