AGFA HE/001132 manual Grayscale Softcopy Presentation State Storage SOP Class

HE/001132	Document No. 001132, Revision 2.0	Page 18 of 92
Agfa HealthCare
	NodeID Livelink : 14140190	14 June, 2007

2.2.1.3.1.3.1.6Grayscale Softcopy Presentation State Storage SOP Class (1.2.840.10008.5.1.4.1.1.11.1)

The Grayscale Softcopy Presentation State Storage SOP Class extends the functionality of the Storage Service class to add the ability to convey an intended presentation state or record an existing presentation state.

It includes capabilities for specifying:

∙the output grayscale space in P-Values

∙grayscale contrast transformations including modality and VOI LUT

∙selection of the area of the image to display

∙image and display relative annotations, including graphics, text and overlays

Note:

A GSPS always refers to exactly one (1) image. Since re-sending an image is prohibited in "Workstation", an archived image can also have maximally one (1) GSPS that refers to it.

Depending on the configured SOP class to be used (CR (§ 2.2.1.3.1.3.1), DX for presentation (§2.2.1..3.2) or MG for presentation (§ 2.2.1.3.1.3.4) annotations and shutters are stored in the GSPS or burned in the image as described in the following table:

Table 2.2-9: Use of GSPS vs. Burning in the image

	CR
	DX for presentation	DX for processing
	MG for presentation
Image	Processed pixels
(processing,W/L,collimation)	+	RAW pixels
	LUTs
Annotations	GSPS or Burned in
Shutters	GSPS or
	when GSPS is not used:
	In case of CR the shutter is
	burned into the Pixel data.	Ignored
	In case of DX and MG the
	shutter is described in the
	shutter module of the image
	header.
Zoom	GSPS or discarded
Markers	Always burned in

The following paragraphs describe into detail how each annotation is embedded in the GSPS:

2.2.1.3.1.3.1.6.1Text