Материал: part03

>Pixel Spacing​ (0028,0030)​ 1C​ Physicaldistanceintheimagingtarget(patient,specimen,orphantom)betweenthecenters​ ofeachpixel,specifiedbyanumericpair-adjacentrowspacing(delimiter)adjacentcolumn​ spacing in mm. See Section 10.7.1.3 for further explanation of the value order.​

Note​

In the case of CT images with an Acquisition Type (0018,9302) of​ CONSTANT_ANGLE, the pixel spacing is that in a plane normal to the central ray​ of the diverging X-Ray beam as it passes through the data collection center.​

Required if:​

•​Volumetric Properties (0008,9206) is other than DISTORTED or SAMPLED, or​

•​SOP Class UID is Segmentation Storage ("1.2.840.10008.5.1.4.1.1.66.4") and Frame of​ Reference UID (0020,0052) is present, or​

•​SOP Class UID is Ophthalmic Tomography Image Storage​ ("1.2.840.10008.5.1.4.1.1.77.1.5.4") and Ophthalmic Volumetric Properties Flag​ (0022,1622) is YES, or​

•​SOP Class UID is Ophthalmic Optical Coherence Tomography B-scan Volume Analysis​ Storage ("1.2.840.10008.5.1.4.1.1.77.1.5.8").​

May be present otherwise.​

>Slice Thickness​(0018,0050)​ 1C​ Nominalreconstructedslicethickness(fortomographicimaging)ordepthoffield(foroptical​

non-tomographic imaging), in mm.​

See Section C.7.6.16.2.3.1 for further explanation.​

Note​

Depth of field may be an extended depth of field created by focus stacking (see​

Section C.8.12.4).​

Required if:​

•​Volumetric Properties (0008,9206) is VOLUME or SAMPLED, or​

•​SOP Class UID is Segmentation Storage ("1.2.840.10008.5.1.4.1.1.66.4") and Frame of​ Reference UID (0020,0052) is present, or​

•​SOP Class UID is Ophthalmic Tomography Image Storage​ ("1.2.840.10008.5.1.4.1.1.77.1.5.4") and Ophthalmic Volumetric Properties Flag​ (0022,1622) is YES, or​

•​SOP Class UID is Ophthalmic Optical Coherence Tomography B-scan Volume Analysis​ Storage ("1.2.840.10008.5.1.4.1.1.77.1.5.8").​

May be present otherwise.​

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RequiredifDimensionOrganizationType(0020,9311)isTILED_FULLandTotalPixelMatrix​

Focal Planes (0048,0303) is greater than 1. May be present otherwise.​

Note​

InthecaseofWholeSlideImages,SpacingBetweenSlices(0018,0088)describes​ the spacing of focal planes separately encoded, and is distinct from Distance​ BetweenFocalPlanes(0048,0014),whichdescribesinwhatmannerdifferentfocal​ planes were combined into a single encoded plane (focus stacking).​

C.7.6.16.2.2 Frame Content Macro​

Table C.7.6.16-3 specifies the Attributes of the Frame Content Functional Group Macro.​

This Functional Group Macro may only be part of the Per-frame Functional Groups Sequence (5200,9230) Attribute.​

Table C.7.6.16-3. Frame Content Macro Attributes​

Required if Frame Type (0008,9007) Value 1 of this frame is ORIGINAL and the​ SOPClassUIDisnot"1.2.840.10008.5.1.4.1.1.2.2"or"1.2.840.10008.5.1.4.1.1.4.4"​ or "1.2.840.10008.5.1.4.1.1.128.1" (Legacy Converted) or​ 1.2.840.10008.5.1.4.1.1.77.1.6 (VL Whole Slide Microscopy Image Storage). May​ be present otherwise.​

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Required if Stack ID (0020,9056) or Functional MR Sequence (0018,9621) is​ present.​

See Section C.7.6.16.2.2.4 and Section C.7.6.16.2.2.8 for further explanation.​

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This Attribute may be referenced by the Dimension Index Pointer (0020,9165)​

Attribute in the Multi-frame Dimension Module.​

See Section C.7.6.16.2.2.5 for further explanation.​

C.7.6.16.2.2.1 Timing Parameter Relationships​

Figure C.7.6.16-2 shows the relationships among the various timing parameters used.​

time

Patient preparation

Scanner Adjustment to Patient

Acquisition DateTime (0008,002A)

Start Acquisition DateTime (0018,9516)

End Acquisition DateTime (0018,9517)

Acquisition Duration

Frame Acquisition Duration (0018,9220)

Frame Acquisition DateTime (0018,9074)

Frame Reference DateTime (0018,9151)

Figure C.7.6.16-2. Relationship of Timing Related Attributes​

C.7.6.16.2.2.2 Frame Reference DateTime​

The Frame Reference DateTime (0018,9151) is used to indicate the point in time that is most representative for that specific frame.​

Note​

1.​For example, in the case of MR it might be the time of acquisition of the data for the ky = 0 line in k-space (the central​ Fourier segment).​

2.​For cardiac gated acquisitions the choice of the Frame Reference DateTime (0018,9151) is influenced by the Nominal​ CardiacTriggerDelayTime(0020,9153).ForrespiratorygatedacquisitionsthechoiceoftheFrameReferenceDateTime​ (0018,9151) is influenced by the Nominal Respiratory Trigger Delay Time (0020,9255).​

C.7.6.16.2.2.3 Frame Acquisition Duration​

The Frame Acquisition Duration (0018,9220) is used to indicate the duration of the acquisition related to this frame.​

For SOP Instances or Concatenations of the Enhanced PET Image Storage SOP Class (1.2.840.10008.5.1.4.1.1.130) the Frame​ Acquisition Duration (0018,9220) is the sum of the portion of each cycle during which data contributing to this frame has actually been​ acquired for all of the cardiac or respiratory cycles of a gated acquisition (i.e., if Cardiac Synchronization Technique (0018,9037)​ equals other than NONE, and/or if Respiratory Motion Compensation Technique (0018,9170) equals other than NONE).​

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C.7.6.16.2.2.4 Concatenations and Stacks​

Due to implementation specific reasons (such as maximum object size) the information of a multi-frame image may be split into more​ than one SOP Instance. These SOP Instances form together a Concatenation. This is a group of SOP Instances within a Series that​ is uniquely identified by Concatenation UID (0020,9161).​

The Dimension Index Sequence (0020,9222) for each SOP Instance with the same Concatenation UID (0020,9161) shall contain​ exactly the same Attributes and values.​

In a Concatenation the Dimension Index Sequence (0020,9222) Items of the Shared Functional Groups (5200,9229) shall be​ identical and have the same values for all individual SOP Instances. The Items of the Per-frame Functional Groups (5200,9230) shall​ be identical for all individual SOP Instances but the values may change per frame. For all other Attributes of all the Modules of the​ IOD, the same Attributes shall be present and the values shall be identical, with the exception of the following Attributes:​

•​Number of Frames (0028,0008)​

•​Concatenation Frame Offset Number (0020,9228)​

•​In-concatenation Number (0020,9162)​

•​SOP Instance UID (0008,0018)​

•​Instance Creation Time (0008,0013)​

Note​

The intent of Concatenations is to split what might have been encoded in a single SOP Instance into smaller fragments for​ moreconvenientstorageortransmission.AllthemultipleSOPInstancesofaConcatenationshouldbeabletobeassembled​ intoavalidsingleSOPInstance.HenceitisnotpermittedtochangesuchAttributesasPhotometricInterpretation(0028,0004),​ Rows (0028,0010), Columns (0028,0011), etc.​

Stacks describe application-specific groups of frames that have a geometric relationship. Stacks have a Stack ID (0020,9056) that​ contains a descriptive name that identifies the stack. A Stack ID (0020,9056) may be re-used in another SOP Instance even outside​ aconcatenation.ThevalueofStackID(0020,9056)isuniquewithinthescopeofaparticularDimensionOrganizationUID(0020,9164)​ ifpresent,otherwiseitisuniquewithinthescopeofaparticularConcatenationUID(0020,9161).SeeFigureC.7.6.16-3foranexample.​

Figure C.7.6.16-3. Identifying Attributes for Concatenation, SOP Instances, Frames and Stacks​

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