Материал: part03

Defined Terms:​

LUNG​

MEDIASTINUM​

ABDO_PELVIS​

LIVER​

SOFT_TISSUE​

BONE​

BRAIN​

POST_FOSSA​

- Standard -​

TheReferencedSOPClassUID(0008,1150)shallbe"1.2.840.10008.5.1.4.39.1".​

If the value of Pseudo-Color Type (0072,0704) is a reference to the Content​ Label (0070,0080) of a standard palette, the Referenced SOP Instance UID​ (0008,1155) shall be the corresponding Well-known SOP Instance UID defined​ in PS3.6.​

RequiredifPseudo-ColorType(0072,0704)isareferencetoastandardpalette.​

May be present otherwise if Pseudo-Color Type (0072,0704) is present.​

- Standard -​

Requiredifthereisaone-wayinteractionsuchthatthelocationoftheReference​

Display Sets is indicated on or controlled by the Navigation Display Set.​

Note​

For example, the graphical representation may indicate either the​ number of slices displayed or contained in the Reference Display​ Set(s).​

- Standard -​

IfNavigationDisplaySetisabsent,shallindicatethatalloftheReferenceDisplay​

Sets cross-reference each other.​

C.23.3.1 Attribute Descriptions​

The Attributes of a Display Sets Sequence (0072,0200) Item shall be applied to the image set represented by the value of Image Set​ Number (0072,0032) in the following order:​

•​Filter Operations Sequence​

•​Reformatting​

•​Sorting Operations Sequence​

•​Presentation Intent​

C.23.3.1.1 Filter Operations Sequence​

The Items in the Filter Operations Sequence (0072,0400) determine which subset of the images in the identified Image Set are to be​ displayed in the associated Display Set image boxes. If there are multiple Items in the Filter Operations Sequence (0072,0400), the​ filter operations shall be applied in Item order, and the output of the preceding filter shall serve as the input to the succeeding filter​ (i.e., an AND operation). See Section C.23.4.2.1.1 and Section C.23.4.2.1.2 for additional details on matching strings and coded​ values.​

When Filter-by Category (0072,0402) has a value of IMAGE_PLANE, Selector Attribute VR (0072,0050) shall have a value of "CS",​ and abstract Enumerated Values shall be used for the value of the associated Selector CS Value (0072,0062) Attribute, which may​ be computed from the values of Image Orientation (Patient) (0020,0037) or Patient Orientation (0020,0020).​

Enumerated Values:​

TRANSVERSE​

CORONAL​

SAGITTAL​

OBLIQUE​

The MEMBER_OF and NOT_MEMBER_OF values of Filter-by Operator (0072,0406) are then applicable.​

Note​

Cross-sectionalimagesdonotnormallycontainacategoricaldescriptionoftheimageplane,butratheronlyapatient-relative​ row and column direction cosines that are unit vectors. The category of image plane can be determined first by categorizing​ the row and column major directions (or detecting if the orientation is oblique according to a pre-specified threshold), and​ then using those categories to select a plan category.​

The following pseudo-code can be used to determine the major axis (R or L, A or P, H or F) from a single direction cosine​ that is an (x,y,z) tuple (as defined in Section C.7.6.2.1.1):​

•​if (abs(x) > threshold)​

axis = "RL"​

•​else if (abs(y) > threshold)​

axis = "AP"​

•​else if (abs(z) > threshold)​

- Standard -​

axis = "HF"​

•​else​

is OBLIQUE​

Having determined the major axis of the row and column, the category of plane can be obtained from a table lookup:​

Alternatively, one can obtain a single vector that is the normal to the orientation (cross product of the row and column unit​ vectors), then find which of the x, y and z components has the maximum absolute value that is above threshold; if x then​ SAGITTAL, if y then CORONAL, if z then TRANSVERSE; if all of the components are below threshold then the orientation​ is OBLIQUE.​

Since it is also necessary to determine whether or not to flip or rotate the image into the preferred orientation (as specified​ byDisplaySetPatientorientation(0072,0700))forthecategoryofplane(e.g.,sagittalsarenormallyviewedwithrowdirection​ posteriorlyandcolumndirectiontowardsthefeet),thecategoricalrowandcolumndirectiontousecanbeobtainedasabove,​ additional accounting for the sign of the direction cosine, e.g.:​

if x < 0 then orientationX = "R" else orientationX = "L"​

if y < 0 then orientationY = "A" else orientationY = "P"​

if z < 0 then orientationZ = "F" else orientationZ = "H"​

if (abs(x) > threshold)​

orientation = orientationX​

…​

An application that is applying a Hanging Protocol Instance shall support any value for Selector Attribute (0072,0026). The Image Set​ SelectorUsageFlag(0072,0024)specifieswhetherornottheimageisincludedinthefilteroutputwhentheAttributeorvalueidentified​ bySelectorAttribute(0072,0026)isnotavailableinanimage.TheAttributesoftheHangingProtocolSelectorAttributeContextMacro​ specify whether Selector Attribute (0072,0026) is contained in a Sequence, Functional Group Sequence, or Private Group.​

Note​

1.​The following Attributes from image IODs are examples of some possible values for Selector Attribute (0072,0026) of​ Filter Operations Sequence (0072,0400). This is not a complete list:​

•​Value 3 of Image Type (0008,0008) or Frame Type (0008,9007)​

•​Anatomic Region Sequence (0008,2218)​

•​Pixel Presentation (0008,9205)​

•​Volume Based Calculation Technique (0008,9207)​

•​Acquisition Contrast (0008,9209)​

•​Contrast/Bolus Agent (0018,0010)​

•​Body Part Examined (0018,0015)​

•​Scanning Sequence (0018,0020)​

- Standard -​