The Image Type (0008,0008) Attribute identifies important image identification characteristics. These characteristics are:
a. Pixel Data Characteristics
1. is the image an ORIGINAL Image; an image whose pixel values are based on original or source data
2. is the image a DERIVED Image; an image whose pixel values have been derived in some manner from the pixel value of one or more other images
b. Patient Examination Characteristics
1. is the image a PRIMARY Image; an image created as a direct result of the Patient examination
2. is the image a SECONDARY Image; an image created after the initial Patient examination
c. Modality Specific Characteristics
d. Implementation specific identifiers; other implementation specific identifiers shall be documented in an implementation's conformance statement.
The Image Type attribute is multi-valued and shall be provided in the following manner:
a. Value 1 shall identify the Pixel Data Characteristics; Enumerated Values for the Pixel Data Characteristics are:
ORIGINAL identifies an Original Image
DERIVED identifies a Derived Image
b. Value 2 shall identify the Patient Examination Characteristics; Enumerated Values for the Patient Examination Characteristics are:
PRIMARY identifies a Primary Image
SECONDARY identifies a Secondary Image
c. Value 3 shall identify any Image IOD specific specialization (optional)
d. Other Values which are implementation specific (optional)
Any of the optional values (value 3 and beyond) may be sent either with a value or zero-length, independent of other optional values, unless otherwise specified by a specialization of this attribute in an IOD.
If the pixel data of the derived Image is different from the pixel data of the source images and this difference is expected to affect professional interpretation of the image, the Derived Image shall have a UID different than all the source images.