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DICOM explained in the context of Structured Reporting
DICOM explained in the context of Structured Reporting
Objective:
Objective:
Parts of the Standard:
Parts of the Standard:
Parts of the Standard:
Parts of the Standard:
DICOM key parts:
DICOM key parts:
Key DICOM concept==SOP Class (Service defn + Information Object Defn):
Key DICOM concept==SOP Class (Service defn + Information Object Defn):
Relationship between:
Relationship between:
Information Object Definition (IOD):
Information Object Definition (IOD):
Information Object Definition (IOD):
Information Object Definition (IOD):
SR Information Model:
SR Information Model:
DICOM explained in the context of Structured Reporting
DICOM explained in the context of Structured Reporting
DICOM explained in the context of Structured Reporting
DICOM explained in the context of Structured Reporting
Module Definition: Attribute Name, Tag, Type, Description
Module Definition: Attribute Name, Tag, Type, Description
Value of data elements can belong to a Set:
Value of data elements can belong to a Set:
Type Designation:
Type Designation:
DICOM Part 5-6 Data set and structures:
DICOM Part 5-6 Data set and structures:
Data set and structures (ctd):
Data set and structures (ctd):
Data set and structures (ctd):
Data set and structures (ctd):
Example of a DICOM Message:
Example of a DICOM Message:
Sequences:
Sequences:
SR Example:
SR Example:
SR Example:
SR Example:
Codes:
Codes:
Codes, Why
Codes, Why
Codes, where, how to encode:
Codes, where, how to encode:
Example from Digital X-Ray (DX) IOD:
Example from Digital X-Ray (DX) IOD:
DICOM Services:
DICOM Services:
Storage Service class (ctd):
Storage Service class (ctd):
Waveforms:
Waveforms:
Waveforms: Relate Images
Waveforms: Relate Images
DICOM Media Specifications:
DICOM Media Specifications:
DICOM Media Specifications (ctd):
DICOM Media Specifications (ctd):
FILE SET
FILE SET

Презентация: «Пойнт печать слайда без обрезки». Автор: Herman Oosterwijk. Файл: «Пойнт печать слайда без обрезки.ppt». Размер zip-архива: 257 КБ.

Пойнт печать слайда без обрезки

содержание презентации «Пойнт печать слайда без обрезки.ppt»
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1 DICOM explained in the context of Structured Reporting

DICOM explained in the context of Structured Reporting

NEMA workshop, Washington DC March 29-30, 2000

Herman Oosterwijk, OTech Inc. herman@otechimg.com

2 Objective:

Objective:

To get a basic understanding of DICOM services and objects in the context of Structured Reporting: DICOM objects (IOD’s) DICOM encoding: Data elements, VR, sequences, Codes DICOM exchange media

3 Parts of the Standard:

Parts of the Standard:

1. Overview 2. Conformance 3. Information Objects 4. Services Class Specifications 5. Data Structures and Semantics 6. Data Dictionary 7. Message Exchange

4 Parts of the Standard:

Parts of the Standard:

8. Network Support 9. Point to point 10. Media Storage and File format 11. Media Storage Application Profiles 12. Physical Media 13. Point to point Print mgt 14. Greyscale display function standard xx. Supplements!!!

5 DICOM key parts:

DICOM key parts:

Common Information Model Conformance claims to define functionality: Matching is critical Roles: SCU/SCP Unique Identification of objects: Each DICOM object is unique Documentation tools such as Macros

6 Key DICOM concept==SOP Class (Service defn + Information Object Defn):

Key DICOM concept==SOP Class (Service defn + Information Object Defn):

DIMSE -------------- C-Store Service Elt.

Info Object----------- SR Object Defn (IOD)

SOP Class------------ C-Store SR

SOP Instance-------- C-Store Mrs. Smith SR

7 Relationship between:

Relationship between:

Service Class Information Object Definition(IOD) DIMSE Service Elements Service Object Pair (SOP) Class

Service Elements:

N-Create N-Set N-Get N-Delete N-Action N-Event-rep

C-Store C-Get C-Find C-Move C-Echo

IOD-->Module-->Attrib

DCM 7

(=SOP Class)

DCM 3

DCM 4

DCM 5,6

8 Information Object Definition (IOD):

Information Object Definition (IOD):

IOD Description; i.e. what is the real world object (Information Entities-IE) that is represented. Can be one or more IE’s (Composite, Normalized) Examples: Image IOD: Patient, Study, Equipment, Image ----> Composite Patient IOD: Patient info ---->Normalized

9 Information Object Definition (IOD):

Information Object Definition (IOD):

IOD Entity-Relationship model; provide the context (relationships) between the IE’s

This information model is critical!

IOD Module table; which modules provide the attributes for the IOD Modules are defined for “convenience reasons” (all patient info together, all image info together....) Modules contain Attributes (Pat. name, etc.)

10 SR Information Model:

SR Information Model:

Patient

1

is

the subject

of

1,n

Study

1

contains

1,n

0,n

spatially

defines

Series

creates

1,n

1

1

1

Frame of Reference

Equipment

contains

0,1

0,n

0,n

0,n

Modality

Presentation

Curve

Image

LUT

State

0,1

0,n

0,n

0,n

Stored

SR

VOI LUT

Overlay

Print

Document

11 DICOM explained in the context of Structured Reporting
12 DICOM explained in the context of Structured Reporting
13 Module Definition: Attribute Name, Tag, Type, Description

Module Definition: Attribute Name, Tag, Type, Description

14 Value of data elements can belong to a Set:

Value of data elements can belong to a Set:

Value Multiplicity:

Defined Terms: Can be extended (e.g. Modality: CT,MR, ES, SR, etc.) Enumerated values: No extensions, additions (e.g. Patient Sex: M, F, O)

More than one value, requires separator (e.g. Other Patient Names)

15 Type Designation:

Type Designation:

1: Required (e.g. pixel spacing) 1C: Required when condition met (e.g. pixel aspect ratio) 2: Required, can be “0” if unknown (e.g. Patient Name, Accession number) 2C: Conditional (e.g. patient positioning) 3: Optional (e.g. Other Patient Name)

16 DICOM Part 5-6 Data set and structures:

DICOM Part 5-6 Data set and structures:

Data Element Tag, Optional Value Representation, Length, Value Field

Data Elem

Data Elem

Data Elem

Data Elem

Tag

VR

Value Length

Value Field

17 Data set and structures (ctd):

Data set and structures (ctd):

Tag: Identifies Attribute Value representation (VR): Groups similar attributes for identification and definition purposes, e.g.: Patient name, Physician name, Other Patient names, etc.: VR is “PN” Birth date, Exam date, etc.: VR is “DA” VR syntaxes specified in part 5

18 Data set and structures (ctd):

Data set and structures (ctd):

Implicit VR: Assumed based on tag Explicit VR: Explicitly specified Note: VR is negotiated during association! Explicit VR: 0010,0010 PN 10 Smith^John Implicit VR: 0010,0010 10 Smith^John

19 Example of a DICOM Message:

Example of a DICOM Message:

20 Sequences:

Sequences:

VR =“SQ” Sequence contains zero or more items, which contains a set of Data Elements Used to encode repeating sets Accommodates multilevel nesting (recursion) Explicit length SQ: value of bytes in length field Undefined length SQ: requires flag in length field and SQ and item delimiters (sppt rqd)

21 SR Example:

SR Example:

*

contains

contains

contains

selected from

Document Root Node CONTAINER

Leaf Node CODE

has concept mod

"

Chest X-ray

" (Document Title)

"

Views = PA and Lateral

"

contains

contains

contains

Leaf Node IMAGE

Heading Node

Content Node CODE

Heading Node

CONTAINER

"

Baseline

"

CONTAINER "

Specific

"

finding

= mass"

"

Conclusions

"

Image Findings

"

has properties

Content Node CODE

Content node SCOORD

Leaf Node NUM

"

conclusion

= probable

"

best illustration of

"

=

"

diameter

= 1.3 cm"

malignancy"

findings

"

inferred from

inferred from

Leaf Node IMAGE

Has

obs context

Has

obs context

Has

obs context

Content Node PNAME

Content Node UIDREF

Content Node PNAME

"

Recording Observe

r =

"

Study Instance UID of

"

Patient-Data-Acquisition

Smith^John^^Dr^"

Evidence Directly Examined

Subject

=

Homer^Jane^^^"

Relationship Modes

by RO

= 1.2.3.4.5.6.7.100"

= By-value

= By-reference

22 SR Example:

SR Example:

23 Codes:

Codes:

SNOMED: Systematized Nomenclature for Human and Veterinary Medicine; maintained by College of American Pathologists (CAP); anatomic identifiers, observations, etc. Requires license fee LOINC: Logical Observation Identifiers, Names and Codes (LOINC); measurements No license (free) CPT, ICD9: Procedure Codes BI-RADS: Mammography 99SDM, SDM, DTMR

24 Codes, Why

Codes, Why

Human language is not exact, many variations are possible: e.g. Exam type is: Chest Thorax Chest PA/LAT chest

25 Codes, where, how to encode:

Codes, where, how to encode:

From CAP, DUKE website, in supplements, eventually in new DICOM Supplement 53. Encoding: Coding Scheme Version # Code Meaning Optional Extended coding for context information

26 Example from Digital X-Ray (DX) IOD:

Example from Digital X-Ray (DX) IOD:

Makes extensive use of Coded data entries using standard vocabulary: Instead of specifying “sagittal” for View Code, one specifies: Code Value : R-112300 Coding Scheme : SNOMED Scheme Version: Version 1.0 Meaning : Sagittal

27 DICOM Services:

DICOM Services:

Modality Worklist Management

Storage

Storage Commit

Query/Retrieve

Print

Performed Procedure Step

Verification

Information System

MR

28 Storage Service class (ctd):

Storage Service class (ctd):

SCP level of conformance: Level 0 (local): user defined subset will be stored only Level 1 (base): Type 1 and 2 attributes will be stored, others may be discarded. SCP is not required to validate the Attributes Level 2 (full): Type 1,2,3 will be stored SCP is not required to validate Attributes Patient ID, Study Instance UID and Series Instance UID may be coerced (negotiated)

29 Waveforms:

Waveforms:

Why yet another way of encapsulating waveforms ? Current mechanisms are proprietary; timing seems ripe for standardization Relationship between images and waveforms is key Existing Curve specification in DICOM was not sufficient

30 Waveforms: Relate Images

Waveforms: Relate Images

31 DICOM Media Specifications:

DICOM Media Specifications:

Medical Imaging Application

DICOM Application Entity

A

B

C

OSI Upper layer svc boundary

DICOM File svc boundary

DCM Presn.

OSI

50 pin

TCP/IP

Media Format

Media Format

Media Format

Phys. Medium

Phys. Medium

Phys. Medium

32 DICOM Media Specifications (ctd):

DICOM Media Specifications (ctd):

DICOM Application Entity

Basic Dir.

Service / Object Pairs

DICOM File Format

Media Formats: e.g. File data structures

Physical Media: e.g. CD-R; 90 mm MOD, etc.

part 10

part 11

part 12

33 FILE SET

FILE SET

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