Материал: part03

•​Local Codes​

Reason for Requested Procedure Code Sequence (0040,100A):​

•​SNOMED codes​

•​ICD-9-CM​

•​ICD-10-CM​

•​Local Codes​

C.23.1.1.2 Image Sets Sequence​

The Image Sets Sequence (0072,0020) within a Hanging Protocol Instance serves to identify the type of image or other object sets​ to which the Hanging Protocol is intended to apply. Multiple types of image sets may be identified for a Hanging Protocol, to combine,​ for example, multiple imaging Studies for a specific anatomy, or multiple imaging Studies performed over a period of time, to monitor​ the progress of a condition. All image sets shall be for the same patient.​

The images to be included in an Image Set may be specified directly by matching Attribute values within the images, or indirectly​ through Key Object Selection Documents or Presentation States by matching their Attribute values.​

Key Object Selection Documents shall be matched by their SOP Class UID. The available Key Object Selection Documents may be​ further matched on the values of their other Attributes (e.g., Concept Name Code Sequence, Coding Scheme Designator = "DCM"​ and Code Value = "113003", which has a code meaning of "For Surgery"). When the Hanging Protocol Instance is applied, the image​ object instances referenced by the matching Key Object Selection Document instances comprise the image set.​

Presentation States shall be matched by their SOP Class UID. The available Presentation States may be further matched on the​ values of their other Attributes (e.g., Content Label). When the Hanging Protocol Instance is applied, the image object instances ref-​ erenced by the matching Presentation State instances comprise the image set.​

Note​

Image Sets Sequence (0072,0020) allows other objects such as waveforms and SR documents to be identified. However,​ Hanging Protocol Display Module operations such as filtering, reformatting, and sorting are defined only for image objects.​ The only expectation for non-image objects is to associate the objects with a position on a screen.​

Each Item in the Image Sets Sequence (0072,0020) shall follow these rules:​

•​Each Item in the Time Based Image Sets Sequence (0072,0030) shall identify one image set, based on time criteria.​

•​The Items of the Image Set Selector Sequence (0072,0022) shall collectively identify one type of image set.​

•​One instance of time based criteria combined with the Items of the Image Set Selector Sequence (0072,0022) shall identify one​ image set.​

•​The number of image sets identified by an Item of the Image Sets Sequence (0072,0020) shall equal the number of Items in the​ Time Based Image Sets Sequence (0072,0030).​

•​The value of Image Set Number (0072,0032) in each Time Based Image Sets Sequence (0072,0030) Item shall be unique across​ all Items of the Image Sets Sequence (0072,0020).​

Note​

1.​TheidentificationofacurrentimagesetisestablishedbytheapplicationpriortoselectionofaHangingProtocolInstance.​ The current image set is not necessarily from a single Study.​

2.​In mammography screening, for example, the Hanging Protocol defines the current image set plus the screening image​ set for the patient from the year prior. There would be one Item in the Image Sets Sequence (0072,0020). Within this​ Item, the Items of the Image Set Selector Sequence (0072,0022) would identify a mammography screening image set​ type. The Time Based Image Sets Sequence (0072,0030) would have two Items, one to identify the current, and one​ to identify the prior.​

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C.23.1.1.3 Image Set Selector Sequence Attributes​

The Image Set Selector Sequence (0072,0022) contains Items that specify the DICOM Attribute Data Element Tags and values that​ shall be used to identify the image or other object set.​

The Image Set Selector Usage Flag (0072,0024) indicates whether the Attribute identified by Selector Attribute (0072,0026) causes​ matching to succeed or fail if the Attribute is not available in an image object.​

Within an Item, Selector Attribute (0072,0026) identifies a DICOM Attribute Data Element Tag that is likely to be present in image or​ other object instances that are desired for the Image Set. If it is a multi-valued Attribute, the Selector Value Number (0072,0028) in-​ dicates which value is intended to be used for matching. The Selector Attribute VR (0072,0050) identifies the Value Representation​ of Selector Attribute (0072,0026). The value of Selector Attribute VR (0072,0050) determines which Attribute of the Hanging Protocol​ Selector Attribute Value Macro is required to specify one or more desired values for the DICOM Attribute. If more than one value is​ specified for the Attribute, or more than one Item is specified in the Selector Code Sequence Value (0072,0080), then image object​ instances with a corresponding Attribute that matches any one of the values shall be included in the Image Set.​

Note​

The values used for Selector Attribute (0072,0026) are intended to identify a type of image set via the general categories of​ modality, anatomy, procedure intent and/or reason. Therefore the values of the Attributes represented by Selector Attribute​ (0072,0026) are likely to be coded terms, Enumerated Values, Defined Terms or free text. The use of free text Attributes is​ less desirable, because their values are less predictable for matching.​

In an image object, some Attributes occur at the top level, or nested within a Sequence or Functional Group Sequence, or both. In​ addition, a Private Attribute may be identified as a Selector Attribute (0072,0026). The Attributes of the Hanging Protocol Selector​ AttributeContextMacroidentifyaSequence,FunctionalGroupSequence,orPrivateGroupcontextforSelectorAttribute(0072,0026).​

The creator of a Hanging Protocol Instance uses this collection of Attributes to identify one type of image set to which the Hanging​ Protocol is intended to apply. The user of a Hanging Protocol Instance (e.g., softcopy review workstation or pre-fetching application)​ uses this collection of Attributes to match a specific image set to a Hanging Protocol, and/or to determine which image sets need to​ be retrieved in order to use a Hanging Protocol Instance. The Key Attributes to match against to obtain image sets are specified in​ Selector Attribute (0072,0026) and its context in each Sequence Item.​

If the value of the Attribute represented by Selector Attribute (0072,0026) contains a free text description (i.e., Selector Attribute VR​ =LO,SH,ST,LT,UT),whetherexactorpartialmatchingisusedtoidentifyaspecificimageinstancewhenapplyingaHangingProtocol​ Instance is implementation dependent.​

C.23.2 Hanging Protocol Environment Module​

Table C.23.2-1 specifies the Attributes that describe and identify the best suited display environment for a Hanging Protocol.​

Differentviewingstylesandinteractionsmaybedefineddependingonaworkstation'scapabilities.Forexample,thehangingpreferences​ for viewing a screening mammogram Study on a 1Kx1K screen with a 10 second repaint time versus a 2Kx2.5K screen may differ.​

Note​

1.​The term Screen is intended to include all types of display devices (e.g., CRT, LCD, etc.).​

2.​This information may be used by an application to select a subset of the available screens on which to apply a Hanging​ Protocol.​

Table C.23.2-1. Hanging Protocol Environment Module Attributes​

ZeroormoreItemsshallbeincludedinthisSequence.​

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all pixels and paint them to the screen).​ Note​

This is not the screen refresh time.​

C.23.2.1 Hanging Protocol Environment Attribute Descriptions​

C.23.2.1.1 Display Environment Spatial Position​

For the Display Environment Spatial Position (0072,0108) Attribute, the lower left corner of the overall bounding box has Cartesian​ coordinates of (0.0,0.0). The upper right corner has coordinates of (1.0,1.0). The scale of the box is based on the Number of Vertical​ Pixels (0072,0104) and Number of Horizontal Pixels (0072,0106), not the physical size of the screens that are part of the workstation.​ The coordinates of each individual screen's box are defined in absolute coordinates relative to the (0,0) and (1,1) range of the overall​ box. Position of a box is given by a (x1,y1), (x2,y2) pair that identifies the upper left corner and lower right corner if the box is rectan-​ gular.​

Note​

The goal is not absolute position matching of the image boxes rendered on the screens using Hanging Protocol layout in-​ formation, but that the relative positioning of the image boxes should be consistent between different workstations.​

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Figure C.23.2-1 depicts a 1K x 1K screen positioned to the left of a 2K x 2.5K screen. The Display Environment Spatial Position​ (0072,0108) of the 1K x 1K screen is (0.0,0.4) (0.33,0.0), and the Display Environment Spatial Position (0072,0108) of the 2K x 2.5K​ screen is (0.33,1.0) (1.0,0.0).​

2560

pixels (0.0, 0.4)

1024 pixels

Figure C.23.2-1. Example Hanging Protocol Screen Environment​

C.23.3 Hanging Protocol Display Module​

Table C.23.3-1 specifies the Attributes that describe operations (filter, reformat, sort, presentation intent), layout and interactions for​ a Hanging Protocol. See Annex V “Hanging Protocols (Informative)” in PS3.17 for further explanation.​

Table C.23.3-1. Hanging Protocol Display Module Attributes​

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Required if the value of Image Box Layout Type (0072,0304) is TILED.​

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