Материал: part03

C.9.2.1 Overlay Attribute Descriptions​

C.9.2.1.1 Overlay Type​

There are two specific types of overlays. The type is specified in this Attribute.​

A Region of Interest (ROI) is a specific use of an Overlay. The overlay bits corresponding to all the pixels included in the ROI shall​ be set to 1. All other bits are set to 0. This is used to specify an area of the image of particular interest.​

A Graphics overlay may express reference marks, graphic annotation, or bit mapped text, etc. A Graphics overlay may be used to​ mark the boundary of a ROI. If this is the case and the ROI statistical parameters are used, they will only refer to the pixels under the​ boundaries, not those in the included regions.​

The overlay bits corresponding to all the pixels included in the Graphics shall be set to 1. All other bits are set to 0.​

C.9.2.1.2 ROI Area, ROI Mean and ROI Standard Deviation​

These Attributes contain the statistical parameters of the ROI. The values of these parameters are for the overlay pixel values set to​ 1.​

C.9.2.1.3 Overlay Subtype​

Defined Terms:​

USER​ User created graphic annotation (e.g., operator)​

AUTOMATED​Machine or algorithm generated graphic annotation, such as output of a Computer Assisted Diagnosis algorithm​

Note​

Additional or alternative Defined Terms may be specified in modality specific Modules, such as in the Overlay Subtype.​

C.9.3 Multi-frame Overlay Module​

Table C.9-3 specifies the Attributes of a Multi-frame overlay.​

Table C.9-3. Multi-frame Overlay Module Attributes​

C.9.3.1 Multi-frame Overlay Attribute Descriptions​

C.9.3.1.1 Number of Frames in Overlay​

A Multi-frame Overlay is defined as an Overlay whose overlay data consists of a sequential set of individual Overlay frames. A Multi-​ frameOverlayis transmitted as a singlecontiguous stream of overlaydata. Framedelimitersarenotcontainedwithinthe datastream.​

Each individual frame shall be defined (and thus can be identified) by the Attributes in the Overlay Plane Module (see Section C.9.2).​

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The total number of frames contained within a Multi-frame Overlay is conveyed in the Number of Frames in Overlay (60xx,0015).​

The frames within a Multi-frame Overlay shall be conveyed as a logical sequence. If Multi-frame Overlays are related to a Multi-frame​ Image, the order of the Overlay Frames are one to one with the order of the Image frames. Otherwise, no Attribute is used to indicate​ the sequencing of the Overlay Frames. If Image Frame Origin (60xx,0051) is present, the Overlay frames are applied one to one to​ the Image frames, beginning at the indicated frame number. Otherwise, no Attribute is used to indicated the sequencing of the​ Overlay Frames.​

The Number of Frames in Overlay (60xx,0015) plus the Image Frame Origin (60xx,0051) minus 1 shall be less than or equal to the​ total number of frames in the Multi-frame Image.​

C.9.4 Bi-plane Overlay Module (Retired)​

C.9.5 Basic Print Image Overlay Box Module (Retired)​

Retired. See PS3.3-2004.​

C.10 Curve, Graphic and Waveform​

C.10.1 Curve Identification Module (Retired)​

Retired. See PS3.3-2004.​

C.10.2 Curve Module (Retired)​

Retired. See PS3.3-2004.​

C.10.3 Audio Module (Retired)​

Retired. See PS3.3-2004.​

C.10.4 Displayed Area Module​

This Module describes Attributes required to define a Specified Displayed Area space.​

The Specified Displayed Area is that portion of the image displayed on the device.​

If Presentation Size Mode (0070,0100) is specified as SCALE TO FIT, then the specified area shall be displayed as large as possible​ within the available area on the display or window, i.e., magnified or minified if necessary to fit the display or window space available.​

If Presentation Size Mode (0070,0100) is specified as TRUE SIZE, then the physical size of the rendered image pixels shall be the​ same on the screen as specified in Presentation Pixel Spacing (0070,0101).​

If Presentation Size Mode (0070,0100) is specified as MAGNIFY, then the factor that shall be used to spatially interpolate image​ pixels to create pixels on the display is defined.​

Note​

If this factor is specified as 1.0, then one image pixel will correspond to one displayed pixel, and if the Specified Displayed​ Area is the entire image, and it fits on the display, then the number of displayed pixels will equal the number of image pixels.​

In all modes, the actual area rendered on a display device may be greater than the Specified Display Area, if the ratio of rows and​ columns of the Specified Display Area differs from the ratio of rows and columns of the display device or window. The Displayed Area​ relative annotations specified in Section C.10.5 Graphic Annotation Module are rendered relative to the Specified Displayed Area,​ not the actual rendered displayed area.​

Note​

1.​The content of a display outside the Specified Display Area is not defined. In particular no padding value (such as black)​ is specified.​

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2.​In the TRUE SIZE and MAGNIFY modes, if the entire Specified Displayed Area is not visible, then display relative​ graphic annotations may be obscured.​

This Module explicitly specifies the aspect ratio to be used to display the image, even if it is 1:1, and it may be different from that​ specified in the referenced image.​

Note​

1.​Depending on the mode, the aspect ratio is either specified using the Presentation Pixel Aspect Ratio (0070,0102), or​ derived from the Presentation Pixel Spacing (0070,0101).​

2.​This explicit definition of aspect ratio implies that graphic objects that are specified relative to the Specified Display Area​ will not change their shape regardless of the size or shape of the presentation device (e.g., whether a landscape or​ portrait monitor is used).​

3.​The mechanism of interpolation, if necessary, is not specified.​

4.​The image may need to be cropped and scroll bars or a panning mechanism provided in order to provide access to​ sections of the image that do not fit within the available area on the display or window.​

Table C.10-4. Displayed Area Module Attributes​

One or more Items shall be included in this Sequence.​

Required if the displayed area selection in this Item does not apply to all the images​ and frames listed in the Presentation State Relationship Module.​

>>Include Table 10-3 “Image SOP Instance​ Reference Macro Attributes”​

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Required if Presentation Pixel Spacing (0070,0101) is not present.​

Note​

1.​This value may be different from the aspect ratio specified by Pixel​ Aspect Ratio (0028,0034) in the referenced image, or implied by the​ values of Pixel Spacing (0028,0030) or Imager Pixel Spacing​ (0018,1164) specified in the referenced image, which are ignored.​

2.​This value must be specified even if the aspect ratio is 1:1.​

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Magnification Ratio​

Required if Presentation Size Mode (0070,0100) is MAGNIFY.​

Note​

1.​Avalueof1.0wouldimplythatonepixelinthereferencedimagewould​ be displayed as one pixel on the display (i.e., it would not be​ interpolated if the aspect ratio of the image pixels is 1:1).​

2.​Avalueof2.0wouldimplythatonepixelinthereferencedimagewould​ be displayed as 4 pixels on the display (i.e., up-sampled by a factor of​ 2 in each of the row and column directions).​

3.​A value of 0.5 would imply that 4 pixels in the referenced image would​ be displayed as 1 pixel on the display (i.e., down-sampled by a factor​ of 2 in each of the row and column directions).​

4.​If the source pixels have an aspect ratio of other than 1:1, then they​ are assumed to have been interpolated to a display pixel aspect ratio​ of 1:1 prior to magnification.​

Note​

1.​In scale to fit mode, the Displayed Area Top Left Hand Corner (TLHC) and Bottom Right Hand Corner (BRHC) have​ the effect of defining how any zoom or magnification and/or pan has been applied to select a region of an image to be​ displayed (the Specified Displayed Area), without assuming anything about the size of the actual display.​

2.​The TLHC and BRHC may be outside the boundaries of the image pixel data (e.g., the TLHC may be 0 or negative, or​ the BRHC may be greater than Rows or Columns), allowing minification or placement of the image pixel data within a​ larger Specified Displayed Area. There is no provision to position a zoomed selected sub-area of the image pixel data​ within a larger Specified Displayed Area.​

3.​When Pixel Origin Interpretation (0048,0301) value is VOLUME, the selected Display Area may extend across multiple​ frames, and may include pixel locations for which there is no pixel data (outside the edge of the imaged volume, not​ encoded in a sparse encoding, or not within explicitly selected frames).​

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