Материал: part03

For example: Some Ultrasound images may have a Photometric Interpretation equal to RGB but the image will have no​ color information if R=G=B for all pixels.​

For consistency within a particular implementation Monochrome Ultrasound images may be coded using a color photometric​ interpretation. In that case inclusion of this Attribute can significantly speed up processing. Since all components are known​ tobeequalonlyoneneedbehandled.TheenhancementscanbesignificantwhencompressedTransferSyntaxesareused.​

C.8.5.6.1.11 Overlay Subtype​

Defined Terms:​

ACTIVE 2D/BMODE IMAGE​ identification of the active area of a 2D/B-mode image​

AREA​

C.8.5.6.1.12 Samples Per Pixel​

For US Images, Samples Per Pixel (0028,0002) is specified to use the following values for specific Photometric Interpretations:​

Table C.8-19. US Samples Per Pixel​

C.8.5.6.1.13 Bits Allocated​

For US Images, Bits Allocated (0028,0100) is specified to use the following values for specific Photometric Interpretations:​

Table C.8-20. US Bits Allocated​

C.8.5.6.1.14 Bits Stored​

For US Images, Bits Stored (0028,0101) shall be equal to Bits Allocated (0028,0100).​

C.8.5.6.1.15 High Bit​

For US Images, High Bit (0028,0102) shall be one less than Bits Stored (0028,0101).​

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C.8.5.6.1.16 Planar Configuration​

For US Images, Planar Configuration (0028,0006) is specified to use the following values for specific Photometric Interpretations:​

Table C.8-23. US Planar Configuration​

The view of the patient anatomy may be described using coded terminology in the View Code Sequence (0054,0220). The view is​ typically specified by transducer position relative to the patient anatomy and/or transducer orientation,​

The view may be described by a single Code Sequence Item, or by combination of post-coordinated Code Sequence Items. The​ principalcodeisspecifiedinViewCodeSequence,andmodifiertermsintheViewModifierCodeSequence(0054,0222).TheBaseline​ CIDs for post-coordinated encoding of view are:​

•​CID 4 “Anatomic Region” (typically used for the primary coded item)​

•​CID 5 “Transducer Approach”​

•​CID 6 “Transducer Orientation”​

•​CID 7 “Ultrasound Beam Path”​

Any of these Context Groups may be used in either the View Code Sequence or the View Modifier Code Sequence.​

For cardiac imaging, a Baseline CID with pre-coordinated view codes is specified:​

•​CID 12226 “Echocardiography Image View”​

Note​

Transducer Position Sequence (0008,2240) and Transducer Orientation Sequence (0008,2244), defined in this Module in​ an earlier edition of the Standard (see PS3.3-2004), are retired.​

C.8.5.6.1.20 (Retired)​

C.8.5.6.1.21 IVUS Acquisition​

Defined Terms:​

MOTOR_PULLBACK​TheIVUSimagingcatheterispositionedinthebloodvesselunderexaminationdistaltotheanatomicalstructures​ to be examined. Then the catheter is attached to a motorized mechanism capable of withdrawing the catheter​ through the vessel at a constant velocity specified by the Attribute IVUS Pullback Rate (0018,3101) from the​ defined IVUS Pullback Start Frame Number (0018,3103) (see Section C.8.5.6.1.24) to the IVUS Pullback Stop​ Frame Number (0018,3104) (see Section C.8.5.6.1.25).​

MANUAL_PULLBACK​TheIVUSimagingcatheterispositionedinthebloodvesselunderexaminationdistaltotheanatomicalstructures​ to be examined. Then the catheter is manually withdrawn through the vessel region of interest.​

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to be examined. Then the catheter is manually withdrawn or advanced through the vessel region of interest.​ GATED_PULLBACK​TheIVUSimagingcatheterispositionedinthebloodvesselunderexaminationdistaltotheanatomicalstructures​ to be examined. Then the catheter is attached to a motorized mechanism capable of withdrawing the catheter​ through the vessel at a rate specified by the Attribute IVUS Gated Rate (0018,3102), once per heart cycle,​ from the defined IVUS Pullback Start Frame Number (0018,3103) (see Section C.8.5.6.1.24) to the IVUS​

Pullback Stop Frame Number (0018,3104) (see Section C.8.5.6.1.25).​

C.8.5.6.1.22 IVUS Pullback Rate​

TheAttributeIVUSPullbackRate(0018,3101)isrequiredwhenIVUSAcquisition(0018,3100)isMOTOR_PULLBACKanditspecifies​ the velocity of withdrawal of the IVUS imaging catheter in millimeters per second.​

C.8.5.6.1.23 IVUS Gated Rate​

The Attribute IVUS Gated Rate (0018,3102) is required when IVUS Acquisition (0018,3100) is GATED_PULLBACK and it specifies​ the velocity of withdrawal of the IVUS imaging catheter in millimeters per beat.​

C.8.5.6.1.24 IVUS Pullback Start Frame Number​

The IVUS Pullback Start Frame Number (0018,3103) specifies the frame number of a IVUS multi-frame acquisition upon which mo-​ torized or gated pullback begins.​

C.8.5.6.1.25 IVUS Pullback Stop Frame Number​

The IVUS Pullback Stop Frame Number (0018,3104) specifies the frame number of a IVUS multi-frame acquisition upon which mo-​ torized or gated pullback ends.​

C.8.5.6.1.26 Lesion Number​

Attribute Lesion Number identifies the lesion(s) of interest imaged within the current SOP Instance. Each lesion shall have a unique​ numeric integer identifier within the Study. If during a Study the same lesion is imaged more than once, the same Lesion Number​ should be used for both SOP Instances.​

Note​

1.​Lesion Number is not a DICOM UID.​

2.​An IVUS pullback may contain multiple values in Lesion Number.​

C.8.6 Secondary Capture Modules​

C.8.6.1 SC Equipment Module​

This Module describes equipment used to convert images into a DICOM format.​

Table C.8-24. SC Equipment Module Attributes​

Defined Terms:​

DV​ Digitized Video​

DI​ Digital Interface​

DF​ Digitized Film​

WSD​Workstation​

SD​ Scanned Document​

SI​ Scanned Image​

DRW​Drawing​

SYN​Synthetic Image​

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Note​

1.​The Attributes specified in the General Equipment Module (see Table C.7-8) describe the equipment that created the​ image being captured. The Attributes of the SC Equipment Module define the equipment that captured the image. The​ following table illustrates typical scenarios for different conversion types:​

2.​Modality (0008,0060) specified in the General Series Module (see Table C.7-5a) has been specialized by this Module​ and is defined as a Type 3 Attribute.​

C.8.6.2 SC Image Module​

Table C.8-25 contains IOD Attributes that describe Secondary Capture Images.​

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Page 680​ DICOM PS3.3 2020a - Information Object Definitions​

Table C.8-25. SC Image Module Attributes​

Include Table 10-25 “Optional View and Slice Progression Direction Macro​

Attributes”​

Note​

The Attributes specified in the General Image Module (see Table C.7-7) describe this image (i.e., the secondary capture​ image). For example, Instance Number (0020,0013) is the image number of the secondary capture image. Source Image​ Sequence (0008,2112) may reference the DICOM image from which this image was generated.​

C.8.6.3 SC Multi-frame Image Module​

Table C.8-25b contains IOD Attributes that describe SC Multi-frame images.​

Table C.8-25b. SC Multi-frame Image Module Attributes​

Enumerated Values:​

YES​

NO​

If this Attribute is absent, then the image may or may not contain recognizable​ visual features.​

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