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The Calculation group, shown in Figure 6, represents the calculation results of an AIM annotation. Calculation results may or may not be directly associated with graphical symbols or markups. For example, given an image with a single ellipse markup, calculation results can be an area in square millimeters and references maximum and minimum pixel values. As another example, an image has an arrow pointing to a specific location and two concentric circles, with an area measurement of the larger circle minus the smaller circle. The computation result is based on the independence calculation made on each circle. The AIM schema allows calculation results that are not directly related to markups. CalculationEntity class has overall information about a calculation performed related directly to image or images. It defines a type of calculation, such as area, height, radius, and volume of ellipsoid from UCUM, and takes the form of controlled terminology that can be captured in code value, code meaning, and coding scheme designator in a single attributed call, typeCode. It also captures MathML as a string attribute within the class. A questionTypeCode attribute captures a reason why a calculation is needed as code. A textual description can be stored in the description attribute. The CalculationResult abstract class contains the type of result (e.g. binary, scalar, vector, histogram, array, histogram, or matrix), unit of measurement, and coded data type (a primitive programming data type such as integer, double, etc. as well as other data type such as URI). A CalculationResult can be stored as a compact or an extended result, CompactCalculationResult and ExtendedCalculation result, respectively. CompactCalculationResult has three attributes: value, encoding, and compression. The result of a calculation is captured in a string format in a value attribute that can hold a value of array, binary, histogram, matrix, scalar, and vector. Encoding is an encoding method applied to the content of the value attribute. Compression is a method used to compress the content in value attribute. CalculationResult has an association with the Dimension class that states how many dimensions a CalculationResult has. ExtendedCalculation stores a result of a calculation individually with the precise location of each element in the result. The Data class is used to store the result value. The Coordinate class identifies location within a dimension for the Data class. A CalculationEntity may have a relationship with a markup or a collection of markups, other calculations, imaging observation, and imaging physical entity. These types of relationships can be captured as AIM statements.
Figure 6. Calculation Group
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