Материал: part03

if the Image Box Layout Type (0072,0304) is STACK, the frames are referenced in a monotonically increasing time order​ in the stack.​

PHASE​ Playback of frames in one Image Box is synchronized by the playback of frames in the other Image Boxes to effect an​ identical phase offset. This presumes that the referenced frames within each referenced Image Box constitute a uniform​ sampling across a single "cycle", and that relative position within that cycle is synchronized across all the referenced​ Image Boxes. For Image Boxes with Image Box Layout Type (0072,0304) value CINE, the set of frames to be displayed​ as one cycle may be specified either using the Referenced Frame Number (0008,1160) Attribute within the Referenced​ Image Sequence (0008,1140), or if that Attribute is not present, using the values of Attributes Start Trim (0008,2142)​ and Stop Trim (0008,2143).​

Note​

1.​PHASE may be used, for instance, to synchronize display of images representing a single cardiac cycle.​

2.​Synchronization of Image Boxes is an initial presentation control. The rendering Application Entity might allow a user​ to unlink the synchronization, e.g., to navigate to cine frames before the Start Trim (0008,2142) frame or after the Stop​ Trim (0008,2143) frame. Any such Application Entity functionality is beyond the scope of the Standard.​

C.11.18 Structured Display Annotation Module​

This Module defines Attributes of text annotation that shall be applied to a Structured Display. The text is defined in position and size​ relative to the Display Environment.​

Note​

1.​The text bounding box is specified using the same Attribute, Display Environment Spatial Position (0072,0108), which​ is used for Image Boxes in the Structured Display Module. This Attribute uses the coordinates (0.0,0.0) as the bottom​ left hand corner and (1.0,1.0) as the top right hand corner. In contrast, the image-related text annotations defined in the​ Graphic Annotation Module in image Presentation State IODs use the Attributes Bounding Box Top Left Hand Corner​ (0070,0010) and Bounding Box Bottom Right Hand Corner (0070,0011), which use the coordinates (0.0,0.0) as the top​ left hand corner and (1.0,1.0) as the bottom right hand corner.​

2.​Annotation of regions of interest in images included in the Structured Display, e.g., circling of a feature of interest, may​ be done with a Presentation State applied to the image in the Structured Display Image Box Sequence (0072,0422) in​ theStructuredDisplayImageBoxModule.ThisStructuredDisplayAnnotationModuleprovidesonlyfortextannotations,​ typically as used for captions for the Image Boxes or for the Structured Display as a whole.​

Table C.11.18-1 describes the Attributes of the Structured Display Annotation Module.​

Table C.11.18-1. Structured Display Annotation Module Attributes​

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

- Standard -​

C.11.18.1 Structured Display Annotation Attribute Descriptions​

C.11.18.1.1 Unformatted Text Value and Display Environment Spatial Position​

The Unformatted Text Value (0070,0006) rendered in Display Environment Spatial Position (0072,0108) need not be confined to the​ specified bounding box.​

Note​

1.​An implementation may render text outside the confines of the bounding box if necessary to display all the specified​ text.​

2.​Alternatively, an implementation may choose to render the text in a scrolling box, or a link to another fixed or popup​ window as appropriate.​

WhenthetextboundingboxoverlapsanImageBox(fromtheStructuredDisplayImageBoxModule),thetextboxhasahigherdisplay​ priority (i.e., it is on top of the image box). The background color of the bounding box is undefined.​

- Standard -​

Note​

1.​Commonly, the background region of the bounding box around the text will be rendered "transparently", i.e., the image​ will be visible, though some implementations may choose to opacify the bounding box behind the text to improve its​ readability.​

2.​With a transparent background, for example, an implementation may choose an "exclusive or" style opacification to be​ sure that the text is discernible over light and dark portions of the image.​

The size, font, and rotation of the individual rendered text characters are unspecified.​

C.11.19 XA/XRF Presentation State Mask Module​

Table C.11.19-1 specifies the Attributes that describe mask operations for a XA/XRF Multi-frame image.​

Table C.11.19-1. XA/XRF Presentation State Mask Module Attributes​

If Mask Operation is REV_TID, specifies the initial offset to be subtracted from​ the first contrast frame number. See Section C.7.6.10.1.1.​

If zero length, TID Offset defaults to 1. Required if Mask Operation (0028,6101)​ is TID or REV_TID.​

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More than one sub region of this frame(s) may be specified when pixel shift is​ different in different regions.​

The order of Items in this Sequence is significant, see Section C.11.19.1.2.​

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

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Two or more pairs of values follow and are the row and column coordinates of​ the other vertices of the polygon region. Each polygon region is implicitly closed​ from the last vertex to the origin vertex and all edges shall be non-intersecting​ except at the vertices. See Section C.11.19.1.2.​

The upper left pixel of the image has the coordinate 1\1.​

Required if the pixel shift does not apply to the entire set of pixels of the frames.​

C.11.19.1 XA/XRF Presentation State Mask Attributes​

C.11.19.1.1 Mask Sub-pixel Shift​

A pair of floating point numbers specifying the fractional vertical [adjacent row spacing] and horizontal [adjacent column spacing] pixel​ shift applied to the mask before subtracting it from the specified region of the contrast frame. The row offset results in a shift of the​ pixels along the column axis. The column offset results in a shift of the pixels along the row axis. A positive row offset is a shift toward​ the pixels of the lower row of the pixel plane. A positive column offset is a shift toward the pixels of the left hand side column of the​ pixel plane.​

C.11.19.1.2 Vertices of the Region​

Each Item of the Region Pixel Shift Sequence (0028,9502) specifies both a region of the contrast frame and a mask pixel shift to be​ applied during the subtraction of that region.​

When the Region Pixel Shift Sequence (0028,9502) contains more than one Item, each region of the contrast frame is subtracted by​ applying the corresponding pixel shift specified in that Item.​

When an Item of the Sequence does not contain the Attribute Vertices of the Region (0028,9503), the applicable region for that Item​ is the whole contrast frame.​

The union of all the regions defined in the Region Pixel Shift Sequence (0028,9502) does not cover necessarily the whole contrast​ frame, in which case the pixels outside the union of all the regions shall be subtracted with no pixel shift.​

If a set of pixels of the contrast frame is contained in more than one region, the applicable pixel shift is the one of the last Item with​ the region that contains this set of pixels, as shown in Figure C.11.19-1.​

- Standard -​