Magnetic particle imaging device

A magnetic particle imaging device comprising:

• a pair of alternate-current magnetic field application coils to excite an alternate-current magnetic field;
• a direct-current magnetic field applicator to generate a linear near field-free region such that magnetism of magnetic particles included in a test object is changed;
• and
• a magnetism change measurement device to measure a magnetism change in the magnetic particles,
• wherein
• the magnetism change measurement device includes:
• a pair of first measurement coils;
• a pair of second measurement coils;
• and
• a measurement device,
• the pair of first measurement coils is disposed so as to sandwich the magnetic particles,
• the pair of second measurement coils is disposed so as to sandwich the magnetic particles and the pair of first measurement coils,
• the pair of alternate-current magnetic field application coils is disposed so as to sandwich the magnetic particles, the pair of first measurement coils, and the pair of second measurement coils,
• the pair of first measurement coils, the pair of second measurement coils, and the pair of alternate-current magnetic field application coils are parallel, and
• the measurement device outputs a signal representing a difference between a signal measured by the pair of first measurement coils and a signal measured by the pair of second measurement coils.