Материал: part03

DICOM PS3.3 2020a - Information Object Definitions​ Page 1391​

Table C.12-8. Common Instance Reference Module Attributes​

>Include Table 10-4 “Series and Instance Reference Macro Attributes”​

C.12.3 Frame Extraction Module​

Table C.12-9 defines the Attributes that describe the frames extracted if the SOP Instance was created in response to a Frame-Level​ retrieve request.​

Table C.12-9. Frame Extraction Module Attributes​

See PS3.4 "Instance and Frame Level Retrieve SOP Classes"​

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See PS3.4 "Instance and Frame Level Retrieve SOP Classes"​

C.12.4 General Reference Module​

Table C.12-10 specifies the Attributes that reference source and other related instances and describe the manner of derivation.​

Table C.12-10. General Reference Module Attributes​

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Enumerated Values:​

YES​

NO​

REORIENTED_ONLY​A projection radiograph that has been​ flipped, and/or rotated by a multiple of 90​ degrees​

Note​

1.​This applies not only to images with a known​ relationship to a 3D space, but also to projection​ images. For example, a projection radiograph such​ as a mammogram that is processed by a point image​ processingoperationsuchascontrastenhancement,​ orasmoothingoredgeenhancingconvolution,would​ have a value of YES for this Attribute. A projection​ radiograph that had been magnified or warped​ geometrically would have a value of NO for this​ Attribute. A projection radiograph that has been​ flipped, and/or rotated by a multiple of 90 degrees,​ such that transformation of pixel locations is possible​ by comparison of the values of Patient Orientation​ (0020,0020) would have a value of​ REORIENTED_ONLY. This Attribute is typically of​ importanceinrelatingimageswithPresentationIntent​ Type (0008,0068) values of FOR PROCESSING and​ FOR PRESENTATION.​

2.​When the value of this Attribute is NO, it is not​ possible to locate on the current image any pixel​ coordinates that are referenced relative to the source​ image, such as for example, might be required for​ rendering CAD findings derived from a referenced​ FOR PROCESSING image on the current FOR​ PRESENTATION image.​

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C.12.4.1 General Reference Module Attributes​

C.12.4.1.1 Derivation Description​

If an Image is identified to be a Derived Image (see Section C.7.6.1.1.2 “Image Type”), Derivation Description (0008,2111) and Deriv-​ ation Code Sequence (0008,9215) describe the way in which the image was derived. They may be used whether or not the Source​ Image Sequence (0008,2112) is provided. They may also be used in cases when the Derived Image pixel data is not significantly​ changed from one of the source images and the SOP Instance UID of the Derived Image is the same as the one used for the source​ image.​

Note​

1.​Examples of Derived Images that would normally be expected to affect professional interpretation and would thus have​ a new UID include:​

a.​images resulting from image processing of another image (e.g., unsharp masking),​

b.​a multiplanar reformatted CT image,​

c.​a DSA image derived by subtracting pixel values of one image from another.​

d.​animagethathasbeendecompressedafterhavingbeencompressedwithalossycompressionalgorithm.Toensure​ that the user has the necessary information about the lossy compression, the approximate compression ratio may​ be included in Derivation Description (0008,2111).​

An example of a Derived Image that would normally not be expected to affect professional interpretation and thus would​ not require a new UID is an image that has been padded with additional rows and columns for more display purposes.​

2.​An image may be lossy compressed, e.g., for long term archive purposes, and its SOP Instance UID changed. PS3.4​ provides a mechanism by which a query for the original image Instance may return a reference to the UID of the lossy​ compressed version of the image using the Alternate Representation Sequence (0008,3001). This allows an application​ processing a SOP Instance that references the original image UID, e.g., a Structured Report, to obtain a reference to​ an accessible version of the image even if the original SOP Instance is no longer available.​

C.12.4.1.2 Source Image Sequence​

If an Image is identified to be a Derived Image (see Section C.7.6.1.1.2 “Image Type”), Source Image Sequence (0008,2112) is an​ optional list of source images used to create the Derived image. Source Instance Sequence (0042,0013) is an optional list of non-​ imagesourceinstancesthatwereusedtocreatethisinstance.SourceImageSequence(0008,2112)and/orSourceInstanceSequence​ (0042,0013)maybeusedwhetherornotthereisadescriptionofthewaytheinstancewasderivedinDerivationDescription(0008,2111)​ or Derivation Code Sequence (0008,9215).​

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Images shall not be referenced by Source Instance Sequence (0042,0013).​

Note​

Multiple Items may be present within Source Image Sequence (0008,2112) and/or Source Instance Sequence (0042,0013),​ in which case either:​

a.​those instance were combined to make the derived instance (e.g., multiple source images to make an MPR or MIP), or​

b.​eachoftheItemsrepresentsastepinthesuccessivederivationofaninstance(e.g.,whenanimagehashadsuccessive​ lossy compression steps applied to it),​

c.​some combination of the above.​

The Purpose of Reference Code Sequence (0040,A170) and the Attributes within the referenced instances themselves may​ be used to determine the history of the derivation, which is not otherwise explicitly specified.​

C.12.5 Timezone Module​

TableC.12.5-1definestheAttributesthatarerequiredforproperfunctioningandidentificationofthetimezonewithinwhichanInstance​ was created.​

Table C.12.5-1. Timezone Module Attributes​

AttributespresentinthisSOPInstance,andforallDTAttributespresent​ inthisSOPInstancethatdonotcontainanexplicitlyencodedtimezone​ offset.​

See Section C.12.1.1.8​

C.13 Print Management Specific Modules​

The following Sections specify Modules used for Print Management.​

C.13.1 Basic Film Session Presentation Module​

Table C.13-1. Basic Film Session Presentation Module Attributes​

PAPER​

CLEAR FILM​

BLUE FILM​

MAMMO CLEAR​

FILM​

MAMMO BLUE FILM​

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