DICOM PS3.17 2019a - Explanatory Information

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

This CT example describes a set of measurements (volume. long axis and mean attenuation coefficient) made from a single volumetric 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, "Attenuation 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.

  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 (G-C036, SRT, "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. The pattern used for the image library uses TID 4020 “CAD Image Library Entry”, though commonality may be refactored.

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

Node

Code Meaning of Concept Name

Code Meaning or Example Value

TID

1

Oncology Measurement Report

TID 1500

1.1

Language of Content Item and Descendants

English

TID 1204

1.2

Observation Context

TID 1001

1.2.1

Person Observer Name

Doe^Jane

TID 1003

1.3

Procedure Reported

Chest+Abd CT W+WO contr IV

TID 1500

1.4

Image Library

TID 1500

1.4.1

IMAGE - CT image #1

TID 4020

1.4.1.1

Study Date

20030417

TID 4020

1.4.1.2

Study Time

104607

TID 4020

1.4.1.3

Horizontal Pixel Spacing

0.810547 mm

TID 4020

1.4.1.j

...

...

TID 4020

1.4.1.n

Pixel Data Columns

512 pixels

TID 4020

1.4.2

IMAGE - CT image #2

TID 4020

1.4.2.j

...

...

TID 4020

1.5

Measurements

TID 1500

1.5.1

Measurement Group

TID 1411

1.5.1.1

Tracking Identifier

Object1

TID 1411

1.5.1.2

Tracking Unique Identifier

1.2.276.0.7230010...

TID 1411

1.5.1.3

Referenced Segment

IMAGE - Segmentation, Segment #1

TID 1411

1.5.1.4

Source image for segmentation

IMAGE - CT image #1

TID 1411

1.5.1.5

Source image for segmentation

IMAGE - CT image #2

TID 1411

1.5.1.6

Finding Site

Adrenal Gland

TID 1419

1.5.1.6.1

Laterality

Right

TID 1419

1.5.1.7

Volume

3267.46 mm3

TID 1419

1.5.1.7.1

Measurement Method

Sum of segmented voxel volumes

TID 1419

CID 7474

1.5.1.8

Long Axis

9.21 mm

TID 1419

CID 7470

1.5.1.8.1

Measurement Method

RECIST 1.1

TID 1419

CID 6147

1.5.1.9

Attenuation Coefficient

70.978 Hounsfield unit

TID 1419

1.5.1.9.1

Derivation

Mean

TID 1419

CID 7464

1.5.1.10

Necrosis

Present

TID 1419

1.5.1.11

Hemorrhage

Absent

TID 1419

1.6

Qualitative Evaluations

TID 1500

1.6.1

Renal Vein Involvement

Absent

TID 1500


DICOM PS3.17 2019a - Explanatory Information