Health Informatics Flashcards
What are the 3 network topologies?
Star, tree, line.
How is a DICOM file stored?
As a sequence of packets.
Give an example of an application entitty?
A workstation, imaging system, PACS archive, etc.
What is an application entity?
A device connected to a network.
What is a message?
A packet of data passed between AEs (contains commands and data)
What is an information object?
A real-world information entity (e.g. medical image, structured report)
Encoded as a set of Attributes
What is a command?
A request to operate on an Information Object across a network
What is a service class?
A service provided by an AE (i.e. commands which will be serviced)
What is a Service-Object Pair Class (SOP Class)?
Union of Information Object Definition and a Command
e.g. “Ultrasound Image Storage” (1.2.840.10008.5.1.4.1.1.6.1)
What is a data set?
A set of Attributes (≡ Information Object)
What is an attribute?
Name, value pair (encoded as a Data Element)
What is a data element?
Lowest unit of information exchange in DICOM
What are the 5 DICOM services?
Store (C-STORE)
-Send images and other objects (e.g. Structured Reports) to a PACS
Query/Retrieve (C-FIND, C-GET)
-Find lists of objects (e.g. Images) and retrieve them to a workstation
Modality Worklist (C-FIND) -Query and retrieve lists of patients and appointments (e.g. from RIS)
Modality Performed Procedure Step (N-CREATE, N-SET)
- Scanner tells RIS about a completed scan
- Complementary to Modality Worklist
Print (N-CREATE, N-SET, N-ACTION)
-Print an image to a DICOM compatible printer
Which part of the DICOM standard relates to the greyscale of an image? What is its purpose?
Part 14.
It specifies how pixel values should be interpreted and displayed to help achieve visual consistency between displays. It maps digital pixel values to luminance.
What is HL-7?
Health Level 7.
It is the standards for exchange, integration, sharing and retrieval of electronic health information.
