The below is what has been changed since AIM version 1 revision 12. 

1. Type in ImageAnnotation and AnnotationOfAnnotation are now being captured
   as control terminology. The attributes added to the Annotation class are:
   - codeValue
   - codeMeaning
   - codingSchemeDesignator
   - codingSchemeVersion

   The "type" attribute has been removed from ImageAnnotation and AnnotationOfAnnotation.

2. codingSchemeVersion has been added to:
   - ImagingObservation
   - ImagingObservationCharacteristic
   - AnatomicEntity
   - AnatomicEntityCharacteristic

3. AnatomicEntityCharacteristic class has been added.

4. ReferencedGeometricShape has been added.

5. Rating class has been added.

6. Inference class has been added.

7. Segmentation class has been added.

8. AnnotationRole class has been added.

8. ProbabilityMap class has been removed and replaced by Segmentation class.

9. Replacing Image.patientOrientationRow and Image.patientOrientationColumn with
   Image.patientOrientation. The attribute shall contains two values, row and column 
   separated by a space.

10. Replacing Image.pixelSpacingHorizontal and Image.pixelSpacingVertical with
   Image.pixelSpacing. The attribute shall contains two values, horizontal and  
   vertical separated by a space.