Magnetic field distortion calculation apparatus, method, and program

A magnetic field distortion calculation method, comprising:

• acquiring a medical image, which is acquired by arranging an auxiliary tool in which a plurality of marking points are arranged according to a predetermined arrangement rule around a target part of a subject and imaging the target part around which the auxiliary tool is disposed using an MRI apparatus and which includes a plurality of feature points represented by the plurality of marking points and the target part, and acquiring a reference image including a plurality of reference points arranged corresponding to the plurality of marking points according to the arrangement rule;
• detecting the plurality of feature points from the medical image;
• estimating a plurality of virtual feature points, which are to be present in the target part in the medical image, using the plurality of feature points;
• and
• acquiring magnetic field distortion information, which indicates spatial magnetic field distortion caused by the MRI apparatus included in the medical image, by performing registration between the plurality of feature points and the plurality of virtual feature points and the plurality of reference points.

A non-transitory computer readable recording medium storing a magnetic field distortion calculation program causing a computer to execute:

• a step of acquiring a medical image, which is acquired by arranging an auxiliary tool in which a plurality of marking points are arranged according to a predetermined arrangement rule around a target part of a subject and imaging the target part around which the auxiliary tool is disposed using an MRI apparatus and which includes a plurality of feature points represented by the plurality of marking points and the target part, and acquiring a reference image including a plurality of reference points arranged corresponding to the plurality of marking points according to the arrangement rule;
• a step of detecting the plurality of feature points from the medical image;
• a step of estimating a plurality of virtual feature points, which are to be present in the target part in the medical image, using the plurality of feature points;
• and
• a step of acquiring magnetic field distortion information, which indicates spatial magnetic field distortion caused by the MRI apparatus included in the medical image, by performing registration between the plurality of feature points and the plurality of virtual feature points and the plurality of reference points.

A magnetic field distortion calculation apparatus, comprising:

• a memory that stores commands to be executed by a computer;
• and
• a processor configured to execute the stored commands;
• and
• wherein the processor executes,
• processing for acquiring a medical image, which is acquired by arranging an auxiliary tool in which a plurality of marking points are arranged according to a predetermined arrangement rule around a target part of a subject and imaging the target part around which the auxiliary tool is disposed using an MRI apparatus and which includes a plurality of feature points represented by the plurality of marking points and the target part, and acquiring a reference image including a plurality of reference points arranged corresponding to the plurality of marking points according to the arrangement rule;
• processing for detecting the plurality of feature points from the medical image;
• processing for estimating a plurality of virtual feature points, which are to be present in the target part in the medical image, using the plurality of feature points;
• and
• processing for acquiring magnetic field distortion information, which indicates spatial magnetic field distortion caused by the MRI apparatus included in the medical image, by performing registration between the plurality of feature points and the plurality of virtual feature points and the plurality of reference points.