Материал: part03

Note​

This can be used to avoid reloading a palette if a system already has that palette loaded without examining all the data​ entries in the palette.​

If this Attribute is present in a Color Palette IOD, it shall have the same value as the SOP Instance UID.​

C.7.9.2 Segmented Palette Color Lookup Table Data​

The Segmented Palette Color Lookup Table Data (0028,1221-1223) is stored as a series of segments, see Table C.7-23. When the​ segments are expanded into the actual lookup table data, it shall have the number of table entries specified by the first value of the​ Palette Color Lookup Table Descriptors (0028,1101-1103), Number of Table Entries.​

These lookup tables shall be used only when segmented lookup table data use is desirable and there is a single sample per pixel​ (single image plane) in the image.​

Table C.7-23. Compressed Palette Color Lookup Table Data​

Segment 0​

Segment 1​

…​

Segment n​

Therearecurrentlythreetypesofsegments:discrete,linear,andindirect.ThesegmentstypeisidentifiedbytheopcodesinTableC.7-​ 24.​

C.7.9.2.1 Discrete Segment Type​

The discrete segment is used to represent a series of palette components that are not monotonic with respect to their predecessors​ or successors. The Segment Length indicates the number of lookup table entries.​

The format of the Discrete Segment Type shall be as in Table C.7-25.​

Table C.7-25. Discrete Segment Type​

Segment Opcode = 0​

Segment Length​

Segment Length number of lookup table entries​

C.7.9.2.2 Linear Segment Type​

The linear segment represents a series of palette components whose values may be represented by a straight line.​

X = palette address, Y = Value contained in the palette.​

(Xo, Yo) = end of the previous segment​

(Xo+ Segment Length, Y1) = end of this linear segment​

- Standard -​

Where: Y1 is contained in the data portion of this segment.​

During expansion, the application should "connect" the previous segment's endpoint, (Xo, Yo), with this segment's endpoint, (Xo+​ Segment Length, Y1) using a straight line, by computing the values for each point between the endpoints.​

Note​

Because the linear segment uses the end point from the previous segment, a linear segment can not be the first segment.​

The linear segment's format shall be as in Table C.7-26.​

Table C.7-26. Linear Segment Type​

Segment Opcode = 1​

Segment Length​

Y1​

C.7.9.2.3 Indirect Segment Type​

Theindirectsegmentallowsthere-useofrepetitiveregionswithinlookuptablewithoutrespecifyingthesegment.Theopcodeisfollowed​ by the number of segments to copy and one offset pointer to the first segment to copy. The byte offset is relative to the beginning of​ the lookup table. For example, if an indirect segment wants to point to the first segment, then the offset will be zero. The offset is a​ 32 bit value but is stored in the segment as a least significant 16 bit value followed by a most significant 16 bit value. An indirect​ segment shall not point to or copy another indirect segment. This avoids the need for recursion and also avoids the possibility of in-​ finite loops.​

The indirect segment's format shall be as follows:​

Table C.7-27. Indirect Segment Type​

Segment Opcode = 2​

Number of segments to copy​

Least significant 16 bits of byte offset to first segment to copy​

Most significant 16 bits of byte offset to first segment to copy​

C.8 Modality Specific Modules​

C.8.1 Computed Radiography Modules​

This Section describes Computed Radiography Series and Image Modules. These Modules contain Attributes that are specific to​ Computed Radiography images. There is no Computed Radiography Equipment Module.​

C.8.1.1 CR Series Module​

Table C.8-1 contains IOD Attributes that describe a computed radiography Series performed on the patient.​

Table C.8-1. CR Series Module Attributes​

“CorrespondenceofAnatomicRegionCodesandBodyPartExaminedDefined​ Terms” in PS3.16 for Defined Terms​

- Standard -​

C.8.1.2 CR Image Module​

Table C.8-2 contains IOD Attributes that describe computed radiography images.​

Table C.8-2. CR Image Module Attributes​

- Standard -​

18CMX24CM​

8INX10IN​

24CMX30CM​

10INX12IN​

30CMX35CM​

30CMX40CM​

11INX14IN​

35CMX35CM​

14INX14IN​

35CMX43CM​

14INX17IN​

- Standard -​

Note​

This value is manufacturer-specific. DICOM specifies​

Standard Attributes in Table 10-23 “Exposure Index​

Macro Attributes”, which are recommended.​

Note​

This value is manufacturer-specific. DICOM specifies​

Standard Attributes in Table 10-23 'Exposure Index​

Macro', which are recommended.​

Include Table 10-7 “General Anatomy Optional Macro Attributes”​Defined CID for the Anatomic Region Sequence is CID 4009 “DX​ AnatomyImaged”forhumans,andCID7482“DXAnatomyImaged​ for Animals” for animals.​

Include Table 10-23 “Exposure Index Macro Attributes”​

C.8.2 CT Modules​

This Section describes the CT Image Module. This Module contains all Attributes that are specific to CT images.​

C.8.2.1 CT Image Module​

The table in this Section contains IOD Attributes that describe CT images.​

Table C.8-3. CT Image Module Attributes​

- Standard -​