DICOM PS3.17 2017b - Explanatory Information

BBBB.2 Encoding Example
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## BBBB.2 Encoding Example

This section illustrates the usage of the Color LUT in the context of a Parametric Map IOD with the Palette Color Lookup Table for the example described.

Table BBBB.2-1. Example data for the Floating Point Image Pixel Module

Attribute | Tag | Value | Comment
--- | --- | --- | ---
Samples per Pixel | (0028,0002) | 1 |
Photometric Interpretation | (0028,0004) | COLOR_RANGE |
Rows | (0028,0010) | 41 |
Columns | (0028,0011) | 32 | This case is a non-square image
Bits Allocated | (0028,0100) | 32 |
Pixel Aspect Ratio | (0028,0034) | 1\1 |
Float Pixel Padding Value | (0028,0122) | -200 |
Float Pixel Padding Range Limit | (0028,0124) | -100 |
Float Pixel Data | (7FE0,0008) | (44 times) -150, -0.1356, 1.317, (28 times) -150, -0.986, 0.4402, -0.0251, 0.6077, 0.2982, 0.0872, 2.6927, 2.1434, -0.5543, -0.3014, -150 etc. | For convenience "," is used to separate the values, type is OF

Table BBBB.2-2. Example data for the Dimension Organization Module

Attribute | Tag | Value | Comment
--- | --- | --- | ---
Dimension Organization Sequence | (0020,9221) |  |
>Dimension Organization UID | (0020,9164) | 1.2.3.5.6 | Sample UID
Dimension Organization Type | (0020,9311) | 3D |
Dimension Index Sequence | (0020,9222) | 1 |
Item 1 | First Item describing Stack ID
>Dimension Index Pointer | (0020,9165) | (0020,9056) |
>Functional Group Pointer | (0020,9167) | (0020,9111) |
>Dimension Organization UID | (0020,9164) | 1.2.3.5.6 |
>Dimension Description Label | (0020,9421) | Stack ID |
Item 2 | Second Item describing In-Stack Position Number
>Dimension Index Pointer | (0020,9165) | (0020,9057) |
>Functional Group Pointer | (0020,9167) | (0020,9111) |
>Dimension Organization UID | (0020,9164) | 1.2.3.5.6 |
>Dimension Description Label | (0020,9421) | In-Stack Position Number |

Table BBBB.2-3. Example data for the Pixel Measures Macro

Attribute | Tag | Value | Comment
--- | --- | --- | ---
Pixel Measures Sequence | (0028,9110) | 1 |
>Pixel Spacing | (0028,0030) | 3.75\3.75 |
>Slice Thickness | (0018,0050) | 5 |

Table BBBB.2-4. Example data for the Frame Content Macro

Attribute | Tag | Value | Comment
--- | --- | --- | ---
Frame Content Sequence | (0020,9111) |  |
>Frame Acquisition Number | (0020,9156) | 1 |
>Dimension Index Values | (0020,9157) | 1\15 |
>Stack ID | (0020,9056) | 1 |
>In-Stack Position Number | (0020,9057) | 15 |
>Frame Comments | (0020,9158) | ... |
>Frame Label | (0020,9453) | ... |

Table BBBB.2-5. Example data for the Identity Pixel Value Transformation Macro

Attribute | Tag | Value | Comment
--- | --- | --- | ---
Pixel Value Transformation Sequence | (0028,9145) |  | Single item with fixed values
>Rescale Intercept | (0028,1052) | 0 |
>Rescale Slope | (0028,1053) | 1 |
>Rescale Type | (0028,1054) | US |

Table BBBB.2-6. Example data for the Frame VOI LUT With LUT Macro

Attribute | Tag | Value | Comment
--- | --- | --- | ---
Frame VOI LUT Sequence | (0028,9132) |  |
>Window Center | (0028,1050) | 0 |
>Window Width | (0028,1051) | 50 | Covering -25 to 25

Table BBBB.2-7. Example data for the Real World Value Mapping Macro

Attribute | Tag | Value | Comment
--- | --- | --- | ---
Real World Value Mapping Sequence | (0040,9096) |  |
>Double Float Real World Value First Value Mapped | (0040,9214) | -16.739 |
>Double Float Real World Value Last Value Mapped | (0040,9213) | 21.434 |
>Real World Value Intercept | (0040,9224) | 0 | Identity transformation
>Real World Value Slope | (0040,9225) | 1 | Identity transformation
>Measurement Units Code Sequence | (0040,08EA) |  |
>>Include Table 8.8-1 "Code Sequence Macro Attributes" |  | (UCUM, {t}, "t") |
>Quantity Definition Sequence | (0040,9220) |  |
>>Include Table 10-2 "Content Item Macro Attributes Description" |  | (113068, DCM, "Student's T-test") |

The Palette Color Lookup Table used is the Spring Color Palette (see Figure BBBB.1-3 Resulting Color LUT Spring).

This can be described as follows through the Palette Color Lookup Table:

Red has a constant value of 255

Green has a linear segment that starts at 0 and ends at 255

Blue has a linear segment that starts at 255 and ends at 0

Using the Segmented Color Lookup Table all three can be described by a discrete segment with length 1 to specify the starting value (0,1,value) followed by a linear segment of length 255 with the end-value (1,255,end-value).

Table BBBB.2-8. Example data for the Palette Color Lookup Table Module

Attribute | Tag | Value | Comment
--- | --- | --- | ---
Red Palette Color Lookup Table Descriptor | (0028,1101) | 256\0\8 |
Green Palette Color Lookup Table Descriptor | (0028,1102) | 256\0\8 |
Blue Palette Color Lookup Table Descriptor | (0028,1103) | 256\0\8 |
Segmented Red Palette Color Lookup Table Data | (0028,1221) | 0,1,255,1,255,255 | For convenience "," is used to separate the values, type is OW
Segmented Green Palette Color Lookup Table Data | (0028,1222) | 0,1,0,1,255,255 | For convenience "," is used to separate the values, type is OW
Segmented Blue Palette Color Lookup Table Data | (0028,1223) | 0,1,255,1,255,0 | For convenience "," is used to separate the values, type is OW

Figure BBBB.1-3. Resulting Color LUT Spring

The values specifying the range to be mapped to the Color LUT are given by the Minimum Stored Value Mapped and the Maximum Stored Value mapped.

Table BBBB.2-9. Example data for the Stored Value Color Range Macro

Attribute | Tag | Value | Comment
--- | --- | --- | ---
Minimum Stored Value Mapped | (0028,1231) | -16.739 | Corresponds to the first LUT entry (255,0,255).
Maximum Stored Value Mapped | (0028,1232) | 21.434 | Corresponds to the last LUT entry (255,255,0).

Table BBBB.2-10. Example data for the Parametric Map Frame Type Macro

Attribute | Tag | Value | Comment
--- | --- | --- | ---
Parametric Map Frame Type Sequence | (0040,9092) |  |
>Frame Type | (0008,9007) | DERIVED\PRIMARY\FMRI\T_TEST |

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DICOM PS3.17 2017b - Explanatory Information