Материал: part03

C.7.6.5.1 Cine Attribute Descriptions​

C.7.6.5.1.1 Frame Time​

FrameTime(0018,1063)isthenominaltime(inmilliseconds)betweenindividualframesofaMulti-frameimage.IftheFrameIncrement​ Pointer points to this Attribute, Frame Time shall be used in the following manner to calculate 'the relative time' for each frame:​

Frame 'Relative Time' (n) = Frame Delay + Frame Time * (n-1)​

where: n = number of frame within the Multi-frame image and the first frame number is one​

Note​

When there is only one frame present, Frame Time (0018,1063) may have either a value of 0, or a nominal value that would​ apply if there were multiple frames.​

C.7.6.5.1.2 Frame Time Vector​

FrameTimeVector(0018,1065)isanarraythatcontainsthetimeincrements(inmilliseconds)betweenthenthframeandtheprevious​ frame for a Multi-frame image. The first frame always has a time increment of 0. If the Frame Increment Pointer points to this Attribute,​ the Frame Time Vector shall be used in the following manner to calculate 'relative time' T(n) for frame n:​

n

T(n) = ∑ ti i = 1

where Δti is the ith Frame Time Vector component.​

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C.7.6.5.1.3 Multiplexed Audio​

During a video acquisition, audio may be used for voice commentary of what is being observed, as well as to record sound-based​ physiological information such as Doppler audio.​

Some Transfer Syntaxes allow for the multiplexing of interleaved audio with video data, and the Attributes of the Cine Module support​ this encoding paradigm. They are not intended to describe audio acquired simultaneously when it is encoded in other SOP Instances​ or within Attributes other than Pixel Data (7FE0,0010) of the same SOP Instance.​

Synchronization between audio and video is assumed to be encoded at the Transfer Syntax level (i.e., within the encoded bit stream).​

Note​

If no audio was recorded, the Multiplexed Audio Channels Description Code Sequence (003A,0300) will be present and​ contain no Items.​

C.7.6.6 Multi-frame Module​

Table C.7-14 specifies the Attributes of a Multi-frame pixel data Image.​

Table C.7-14. Multi-frame Module Attributes​

Enumerated Values:​

YES​

NO​

C.7.6.6.1 Multi-frame Attribute Descriptions​

C.7.6.6.1.1 Number of Frames and Frame Increment Pointer​

A Multi-frame Image is defined as a Image whose pixel data consists of a sequential set of individual Image Pixel frames. A Multi-​ frame Image is transmitted as a single contiguous stream of pixels. Frame headers do not exist within the data stream.​

Each individual frame shall be defined (and thus can be identified) by the Attributes in the Image Pixel Module (see Section C.7.6.3).​ All Image IE Attributes shall be related to the first frame in the Multi-frame image.​

The total number of frames contained within a Multi-frame Image is conveyed in the Number of Frames (0028,0008). Number of​ Frames (0028,0008) shall have a value greater than zero.​

C.7.6.6.1.2 Frame Increment Pointer​

The frames within a Multi-frame Image shall be conveyed as a logical sequence. The information that determines the sequential order​ of the frames shall be identified by the Data Element Tag or Tags conveyed by the Frame Increment Pointer (0028,0009). Each​ specificImageIODthatsupportstheMulti-frameModulespecializestheFrameIncrementPointer(0028,0009)toidentifytheAttributes​ that may be used as sequences.​

Even if only a single frame is present, Frame Increment Pointer (0028,0009) is still required to be present and have at least one value,​ each of which shall point to an Attribute that is also present in the Data Set and has a value.​

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Note​

For example, in single-frame instance of an IOD that is required to or may contain the Cine Module, it may be appropriate​ for Frame Time (0018,1063) to be present with a value of 0, and be the only target of Frame Increment Pointer (0028,0009).​

When the IOD permits the use of Multi-frame Functional Groups as a Standard or Standard Extended SOP Class, Frame Increment​ Pointer may contain the single value of Per-frame Functional Groups Sequence (5200,9230) to indicate that the Functional Groups​ contain the descriptors of the frames.​

Note​

For example, the Multi-frame Grayscale Word SC Image IOD requires the Multi-frame Module but also permits the Multi-​ frame Functional Groups, for example, to describe the plane position of each frame.​

C.7.6.6.1.3 Stereoscopic Pairs Present​

Stereo Pairs Present (0022,0028) shall have the value of YES when frames within a Multi-frame Image are encoded as left and right​ stereoscopic pairs.​

When Stereoscopic Pairs are present, and the pixel data is uncompressed, or compressed with a Transfer Syntax that does not ex-​ plicitly convey the semantics of stereo pairs, the first and subsequent odd frames (frames numbered from 1) are the left frame of each​ pair, and the second and subsequent even frames are the right frame of each pair.​

If the pixel data is compressed with a Transfer Syntax that does explicitly convey the semantics of stereo pairs, then the identification​ of the left and right frames in the compressed pixel data will be as defined in the compressed bit stream.​

Note​

1.​Forexample,theMPEG-4AVC/H.264SupplementalEnhancementInformation(SEI)framepackingarrangement(FPA)​ field defines various methods of encoding stereo pairs. See PS3.5 Section 8.2.8 “MPEG-4 AVC/H.264 High Profile /​ Level 4.2 Video Compression”. Videos encoded with this Transfer Syntax are used for what is colloquially referred to​ as "3D Television" applications. PS3.5 Section 8.2.9 “MPEG-4 AVC/H.264 Stereo High Profile / Level 4.2 Video Com-​ pression” defines a method of encoding stereo pairs without frame packing and with 2D backwards compatibility.​

2.​ThepresenceofStereoPairsPresent(0022,0028)isindependentoftheuseofinstancesoftheStereometricRelationship​ IOD. In particular, no further description of the method of acquisition of the stereoscopic pairs is required, such as might​ be present in Attributes of the Stereo Pairs Sequence (0022,0020) of the Stereometric Relationship IOD. The definition​ of the references to left and right pairs in that IOD prohibit the encoding of the left and right pairs in the same instance,​ as distinct for the usage here.​

3.​Not all multi-frame IODs are sufficiently generic in their description to permit the presence of stereoscopic pairs. E.g.,​ the Video Endoscopic Image IOD, Video Microscopic IOD and Video Photographic IODs are, since they do not specify​ any conflicting constraints on the meaning of the frames.​

C.7.6.7 Bi-plane Sequence Module (Retired)​

C.7.6.8 Bi-plane Image Module (Retired)​

C.7.6.9 Frame Pointers Module​

Table C.7-15 specifies the Attributes of a Frame Pointer Module.​

Table C.7-15. Frame Pointers Module Attributes​

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Note​

1.​Frame numbers begin at 1.​

2.​Frame of Interest Description is intended to indicate such frames as Systolic, Diastolic, Stenotic Artery, or trigger label.​

C.7.6.10 Mask Module​

Table C.7-16 specifies the Attributes that describe mask operations for a Multi-frame image.​

Table C.7-16. Mask Module Attributes​

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SUB​For subtraction with mask images.​

NAT​Native viewing of image as encoded.​

Note​

If an implementation does not recognize the Defined Term for​ RecommendedViewingMode(0028,1090),revertingtonativedisplay​ mode is recommended.​

Note​

Frame numbers begin at 1.​

C.7.6.10.1 Mask Subtraction Attribute Descriptions​

C.7.6.10.1.1 Mask Operation​

Mask Operation (0028,6101) specifies a type of mask operation to be performed.​

- Standard -​