C.8.32.2 Parametric Map Image Module

C.8.32.2 Parametric Map Image Module
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Table C.8.32-2 defines the general Attributes of the Parametric Map Image Module.

Table C.8.32-2. Parametric Map Image Module Attributes

Attribute Name	Tag	Type	Attribute Description
Image Type	(0008,0008)	1	Image identification characteristics. Enumerated Values for Value 1: DERIVED Enumerated Values for Value 2: PRIMARY Value 3 shall be Image Flavor, Defined Terms for which are specified in Section C.8.16.1.3. Value 4 shall be Derived Pixel Contrast, common Defined Terms for which are specified in Section C.8.16.1.4 and MR-specific Defined Terms for which are specified in Section C.8.13.1.1.1.4.
Include Table 10-12 "Content Identification Macro"
Samples per Pixel	(0028,0002)	1	Number of samples (planes) in this image. Enumerated Values: 1
Photometric Interpretation	(0028,0004)	1	Specifies the intended interpretation of the pixel data. Enumerated Values: MONOCHROME2
Bits Allocated	(0028,0100)	1	Number of bits allocated for each pixel sample. Enumerated Values if Pixel Data (7FE0,0010) or Pixel Data Provider URL (0028,7FE0) is present: 16 Enumerated Values if Float Pixel Data (7FE0,0008) is present: 32 Enumerated Values if Double Float Pixel Data (7FE0,0009) is present: 64
Bits Stored	(0028,0101)	1C	Number of bits stored for each pixel sample. Enumerated Values: 16 Required if Pixel Data (7FE0,0010) or Pixel Data Provider URL (0028,7FE0) is present.
High Bit	(0028,0102)	1C	Most significant bit for pixel sample data. Enumerated Values: 15 Required if Pixel Data (7FE0,0010) or Pixel Data Provider URL (0028,7FE0) is present.
Presentation LUT Shape	(2050,0020)	1	Specifies an identity transformation for the Presentation LUT such that the output of all grayscale transformations are defined to be in P-Values. Enumerated Values: IDENTITY output is in P-Values. Note The intent of specifying this Attribute for Parametric Maps is only to achieve consistency of rendering when displayed as grayscale, not to imply that grayscale contrast of the displayed image is meaningful. It is not applicable when the image is rendered with pseudo-color, for example.
Lossy Image Compression	(0028,2110)	1	Specifies whether an Image has undergone lossy compression (at a point in its lifetime), or is derived from lossy compressed images. Enumerated Values: 00 Image has NOT been subjected to lossy compression. 01 Image has been subjected to lossy compression. Once this value has been set to 01 it shall not be reset. See Section C.8.32.2.1 and Section C.7.6.1.1.5.
Lossy Image Compression Ratio	(0028,2112)	1C	Describes the approximate lossy compression ratio(s) that have been applied to this image. See Section C.7.6.1.1.5.2. Required if present in the source images or this IOD instance has been compressed.
Lossy Image Compression Method	(0028,2114)	1C	A label for the lossy compression method(s) that have been applied to this image. See Section C.7.6.1.1.5.1. Required if present in the source images or this IOD instance has been compressed. See Section C.8.32.2.1.
Burned In Annotation	(0028,0301)	1	Indicates whether or not image contains sufficient burned in annotation to identify the patient and date the image was acquired. Enumerated Values: NO
Recognizable Visual Features	(0028,0302)	1	Indicates whether or not the image contains sufficiently recognizable visual features to allow the image or a reconstruction from a set of images to identify the patient. Enumerated Values: YES NO
Content Qualification	(0018,9004)	1	Content Qualification Indicator Enumerated Values: PRODUCT RESEARCH SERVICE See Section C.8.13.2.1.1 for further explanation.

C.8.32.2.1 Lossy Image Compression and Lossy Image Compression Method

If Lossy Image Compression (0028,2110) in any of the source images is "01", the value shall be "01" for the Parametric Map instance.

The process of derivation of a Parametric Map itself is defined not to be lossy compression, even though it involves loss. If the Parametric Map instance is encoded using a lossy compression transfer syntax, then the value shall be set to "01".

Note

To state the obvious, it is not advisable to lossy compress a Parametric Map SOP Instance, since that will alter the quantitative values that are the intent of the object.