DICOM PS3.17 2019b - Explanatory Information

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


Resulting Color LUT Spring

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


DICOM PS3.17 2019b - Explanatory Information