Материал: part17

RRR Measurement Report SR Document for​ Planar and Volumetric ROI (Informative)​

This Annex contains examples of the use of ROI templates within Measurement Report SR Documents.​

RRR.1 Measurement Report SR Document Volumetric ROI on CT Example​

ThisCTexampledescribestheminimumcontentnecessarytoencodeasinglemeasurement(volume)madefromasinglevolumetric​ ROI encoded as a single segment that spans two source CT images.​

Note​

1.​References to Segmentation Image or Surface Segmentation objects are encoded as IMAGE references, with a single​ value specified in Referenced Segment Number.​

2.​The method of volume calculation is not described in this example.​

Table RRR.1-1. Volumetric ROI on CT Example​

RRR.2 Measurement Report SR Document Volumetric ROI on CT Example​

ThisCTexampledescribesasetofmeasurements(volume.longaxisandmeanattenuationcoefficient)madefromasinglevolumetric​ ROI encoded as a single segment that spans two source CT images, and includes a description of the measurement methods and​ the finding site, as well as an image library to describe characteristics of the images used, and categorical observations at the​ measurement group and entire subject level.​

Note​

1.​For a different modality than CT, the choice of measurement for the mean intensity would not be (122713, DCM, "Atten-​ uation Coefficient").​

2.​For MR one might use (110852, DCM, "MR signal intensity"), or (110804, DCM, "T1 Weighted MR Signal Intensity"),​ etc. See also CID 7180 “Abstract Multi-dimensional Image Model Component Semantics” for various appropriate signal​ intensity types for MR and other modalities.​

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3.​For PET one might use (110821, DCM, "Nuclear Medicine Tomographic Activity"), in which case the specific type of​ signal would be apparent from the units, e.g., ({SUVbw}g/ml, UCUM, "Standardized Uptake Value body weight") or for​ activity-concentration, (Bq/ml, UCUM, "Becquerels/milliliter"). See also CID 84 “PET Units”.​

4.​Care should be taken when selecting modifiers such as (370129005, SCT, "Measurement Method") versus (121401,​ DCM, "Derivation").​

5.​The finding site and laterality within the measurement template (TID 1419 “ROI Measurements”) are factored out and​ shared by both measurements.​

6.​ThepatternusedfortheimagelibraryusesTID4020“CADImageLibraryEntry”,thoughcommonalitymayberefactored.​

7.​The length of the long axis of the volumetric ROI is encoded, but the end points of the line segment used to make that​ measurement are not recorded, since only the volumetric spatial description of TID 1411 is used. For an alternative​ encoding, see Section RRR.5.​

Table RRR.2-1. Volumetric ROI on CT Example​

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RRR.3MeasurementReportSRDocumentPlanarROIonDCE-MRTracerKinetic​

Model Example​

This DCE-MR example illustrates encoding measurements of mean and standard deviation Ktrans values in a planar ROI.​

Note​

1.​The measurement method and finding site and laterality within the measurement template (TID 1419) are factored out​ and shared by both measurements.​

Table RRR.3-1. Planar ROI on DCE-MR Example​

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RRR.4MeasurementReportSRDocumentVolumetricandSUVROIonFDGPET​

Example​

This FDG PET example illustrates encoding measurements of various SUVbw related measurements.​

Note​

1.​The real world value map reference (for intensity, not size measurements) and finding site within the measurement​ template (TID 1419) are factored out and shared by measurements.​

2.​The time point is described in this case only with a simple label.​

Table RRR.4-1. SUV ROI on FDG PET Example​

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RRR.5 Measurement Report SR Document Volumetric ROI with RECIST Linear​ Distance Specified by Coordinates on CT Example​

ThisCTexampledescribesasetofmeasurements(volume,longaxis(RECIST),shortaxis(WHObi-dimensional)andmeanattenuation​ coefficient) made from a single volumetric ROI encoded as a single segment, including specification of the end points of the line​ segment used to make the linear distance measurements.​

Note​

1.​The lengths of the long axis and the short axis of the lesion are not encoded as characteristics of the volumetric ROI,​ but rather the long axis and the short axis are encoded explicitly as the end points of line segments used to make those​ measurements. The commonality of the Tracking Unique Identifier establishes that they are measurements of the same​ ROI. If multiple measurements were to be made of the same ROI over time or by different observers, other content​ items such as those related to Timepoint, Activity Session and Observer may be used. For an alternative encoding, see​ Section RRR.2.​

2.​The pattern of using multiple sibling linear distance measurements within TID 1419 “ROI Measurements” is similar to​ and not incompatible with the pattern used for length, width and height in the OB/GYN Ultrasound template TID 5016​ “LWH Volume Group”.​

3.​The Finding Site information is duplicated in the second measurement template invocation in this example, though it is​ not required to be.​

Table RRR.5-1. Volumetric ROI on CT Example​

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