An analysis tree for IQWorks which can be used to calculate flatness, symmetry and deviation for a 20 x 20 cm radiation field. The field does not need to be centred in the image, but must not be at an angle. Flatness and deviation are calculated according to IEC 1989 standard, using a flattened area which is 80% of the width and height of the field size. Symmetry here is an approximation to the IEC standard using sixteen discrete 2 x 2 mm ROIs.
For full details please see the user notes PDF document.
Please note that this tree is for educational use only and not for clinical applications.