Dynamic analysis system

A radiographic dynamic analysis system comprising:

• an analytic value calculation unit configured to calculate an analytic value in a plurality of time phases on the basis of a radiographic dynamic image in the plurality of time phases obtained by performing radiographic dynamic photography on the chest of a subject, wherein the analytic value is one of transmitted X-ray intensity and a value calculated using the transmitted X-ray intensity;
• a ventilation state calculation unit configured to calculate, using a non-linear function that is predetermined, an index value representing a ventilation state of a lung field from the analytic value in the plurality of time phases, wherein the ventilation state represented by the index value is an air amount within the lung field or a change amount of the air within the lung field, wherein the non-linear function used in an inspiratory phase is a function having a downward curve at least in a portion of the region and the non-linear function used in an expiratory phase is a function having an upward curve at least in a portion of the region;
• a display unit;
• and
• a control unit configured to display information indicating the index value calculated on the plurality of time phases, on the display unit.