1. A flush toilet comprising:
a water tank with at least one through hole; and
a liquid dispenser installed outside on the water tank, including a container, a dispensing component mounted on the container and a tube with one end connected to the dispensing component and the other end inserted inside the water tank via the through hole.
2. The flush toilet of claim 1, wherein the water tank includes a tank body and a lid covered on the tank body, the through hole is formed on the lid and the liquid dispenser is installed on the lid.
3. The flush toilet of claim 2, wherein the through hole is in a circular, a rectangular, a square or an oval shape.
4. The flush toilet of claim 2, wherein the lid has a recess for receiving the liquid dispenser.
5. The flush toilet of claim 2, wherein the lid has an enclosure formed thereon for the liquid dispenser to be installed in the enclosure.
6. The flush toilet of claim 1, wherein the container is made of transparent or semitransparent material.
7. The flush toilet of claim 1, wherein the dispensing component is a dispenser pump.
8. The flush toilet of claim 1, wherein a plurality of liquid dispensers are aligned on the top of the water tank.
9. The flush toilet of claim 8, wherein a plurality of through holes are formed respectively to receiving tubes of the liquid dispensers.
10. The flush toilet of claim 8, further comprising a multi-connector with one connecting portion connected to the through hole and a plurality of connecting portions connected to tubes of the liquid dispensers, respectively.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A static magnetic field correction method comprising the steps of: providing a magnetic field correction coil in a yoke constructing a magnetic circuit of an MRI system; producing a correction magnetic field by flowing a correction electric current to the magnetic field correction coil; and adding a correction magnetic field to the static magnetic field of an imaging region so as to correct the static magnetic field of the imaging region.
2. The static magnetic field correction method of claim 1, further comprising the steps of: providing a first magnetic field correction coil in a first yoke; providing a second magnetic field correction coil in a second yoke across an imaging region from the first yoke; producing a first correction magnetic field by the first magnetic field correction coil; and producing a second correction magnetic field having its direction and intensity equal to those of the first correction magnetic field by the second magnetic field correction coil.
3. The static magnetic field correction method of claim 1, further comprising the steps of: providing a first magnetic field correction coil in a first yoke; providing a second magnetic field correction coil in a second yoke across an imaging region from the first yoke; producing a first correction magnetic field by the first magnetic field correction coil; and producing a second correction magnetic field having at least one of its direction and intensity different from those of the first correction magnetic field by the second magnetic field correction coil.
4. The static magnetic field correction method of claim 1, further comprising the steps of: collecting FID signals; determining a resonance frequency from the FID signals; determining a frequency difference between the resonance frequency and an RF sendreceive system; and deciding a correction electric current from the frequency difference.
5. The static magnetic field correction method of claim 4, further comprising the steps of: disposing an NMR probe combining a small phantom with a small coil in the vicinity of an imaging region; sending RF pulses from the small coil to receive FID signals from the small phantom by the small coil; and determining a resonance frequency from the FID signals.
6. The static magnetic field correction method of claim 1, further comprising the steps of: measuring a temperature of a member constructing the magnetic circuit; determining a resonance frequency from a temperature characteristic; determining a frequency difference between the resonance frequency and a target frequency; and deciding a correction electric current from the frequency difference.
7. An MRI system comprising: a yoke constructing a magnetic circuit; a magnetic field correction coil provided in the yoke for producing a correction magnetic field; and a power source for the magnetic field correction coil for supplying a correction electric current to the magnetic field correction coil.
8. The MRI system of claim 7, further comprising: a first yoke and a second yoke at the position where an imaging region is interposed therebetween; a first magnetic field correction coil provided in the first yoke for producing a first correction magnetic field; a second magnetic field correction coil provided in the second yoke and connected in series with the first magnetic field correction coil so as to produce a second correction magnetic field having its direction and intensity equal to those of the first correction magnetic field; and a power source for the magnetic field correction coil for supplying a correction electric current to a series circuit of the first magnetic field correction coil and the second magnetic field correction coil.
9. The MRI system of claim 7, further comprising: a first yoke and a second yoke at the position where an imaging region is interposed therebetween; a first magnetic field correction coil provided in the first yoke for producing a first correction magnetic field; a second magnetic field correction coil provided in the second yoke for producing a second correction magnetic field; a power source for the first magnetic field correction coil for supplying a first correction electric current to the first magnetic field correction coil; and a power source for the second magnetic field correction coil for supplying a second correction electric current to the second magnetic field correction coil.
10. The MRI system of claim 7, further comprising: a correction electric current deciding device which collects FID signals, determines a resonance frequency from tie FID signals, determines a frequency difference between the resonance frequency and an RF sendreceive system, and decides a correction electric current from the frequency difference.
11. The MRI system according to claim 9, further comprising: an NMR probe combining a small phantom with a small coil disposed in the vicinity of an imaging region, wherein
the correction electric current deciding device sends RF pulses from the small coil to receive FID signals from the small phantom by the small coil, and determines a resonance frequency from the FID signals.
12. The MRI system of claim 7, further comprising:
a temperature sensor for measuring a temperature of a member constructing the magnetic circuit; and
a correction electric current deciding device which determines a resonance frequency from the temperature characteristic, determines a frequency difference between the resonance frequency and a target frequency, and decides a correction electric current from the frequency difference.