Method and system for maintaining iso center constant in an iso centric x-ray imaging system

A method of maintaining a constant iso-center point and a constant X-ray exposure in an x-ray imaging system while moving from one area of interest to another area of interest, the imaging system comprising a movable patient table and a rotatable gantry, the method comprising:

• calculating an iso-center point with reference to an initial area of interest;
• unlocking at least one axis motion from the defined iso-center point corresponding to the initial area of interest;
• manually altering at least one axis motion along with a patient table tilt movement to locate a new area of interest;
• dynamically tracking the iso-center point at a given instance using the constant axis motion parameters along with relative motion of variable axes;
• stopping other axis motion except patient table tilt movement upon identifying the new area of interest;
• and
• calculating the iso-center point with reference to the new area of interest using all the axes motion parameters.

An iso-center based imaging system comprising:

• a movable patient table;
• a rotatable gantry;
• and
• a processor configured to control the movements of the gantry and the patient table, the processor comprising:
• a tracking module configured to dynamically calculate the iso-center point while moving from one area of interest to another, using the relative motion of all unlocked axes;
• and
• a fixing module configured to compute the iso-center point corresponding to the identified area of interest using all the axes information.