Magnetic resonance imaging apparatus and RF pulse for navigator and imaging sequence applying method

An RF pulse applying method comprising:

• executing, by a processor, a navigator sequence for transmitting an RF pulse to a subject and thereby obtaining each magnetic resonance signal as navigator data;
• generating a position profile indicative of the relationship between positions of the diaphragm and time based on a phase of the navigator data;
• and
• executing an imaging sequence for imaging an abdominal region and to correct and excitation section according to a detected position of a diaphragm using the navigator data;
• wherein executing the navigator sequence comprises:
• simultaneously exciting a first region inside a navigator area, a second region inside the navigator area, and a third region located outside of the navigator area in a plane orthogonal to the navigator area at the same time, wherein intensities of different navigator data signals are obtained from the first and second regions, and wherein one of the first and second regions is a body-moved region, wherein the first region is a lung, the second region is a liver, the third region is a subcutaneous fat, and the body-moved region is a diaphragm, and wherein the simultaneously exciting a first region comprises transmitting the RF pulse to the subcutaneous fat set as the third region.