C.7.6.4b Enhanced Contrast/Bolus Module

Table C.7-12b specifies the Attributes that describe the contrast/bolus used in the acquisition of the Image.

Table C.7-12bENHANCED CONTRAST/BOLUS MODULE ATTRIBUTES

Attribute Name Tag Type Attribute Description
Contrast/Bolus Agent Sequence (0018,0012) 1 Sequence that identifies one or more contrast agents administered prior to or during the acquisition. One or more Items shall be included in this sequence.
>Include ‘Code Sequence Macro’ Table 8.8-1 Baseline CID 12.
>Contrast/Bolus Agent Number (0018,9337) 1 Identifying number, unique within this SOP Instance, of the agent administered. Used to reference this particular agent from the Contrast/Bolus Functional Group Macro. The number shall be 1 for the first Item and increase by 1 for each subsequent Item.
>Contrast/Bolus Administration Route Sequence (0018,0014) 1 Sequence that identifies the route of administration of contrast agent. Only a single Item shall be included in this sequence.
>>Include ‘Code Sequence Macro’ Table 8.8-1 Baseline CID 11.
>Contrast/Bolus Ingredient Code Sequence (0018,9338) 2 Active ingredient of agent. Zero or more Items shall be included in this sequence.
>>Include ‘Code Sequence Macro’ Table 8.8-1 Baseline CID 13.
>Contrast/Bolus Volume (0018,1041) 2 Total volume administered in milliliters of diluted contrast agent.
>Contrast/Bolus Ingredient Concentration (0018,1049) 2 Milligrams of active ingredient per milliliter of agent.
>Contrast/Bolus Ingredient Percent by Volume (0052,0001) 3 Percentage by volume of active ingredient in the total volume.
>Contrast/Bolus Ingredient Opaque (0018,9425) 3 Absorption of the ingredient greater than the absorption of water (tissue). Enumerated Values: YES NO See Section C.7.6.4b.1.
>Contrast Administration Profile Sequence (0018,9340) 3 Sequence that describes one or more phases of contrast administered. One or more Items are permitted in this sequence.
>>Contrast/Bolus Volume (0018,1041) 2 Volume administered during this phase in milliliters of diluted contrast agent.
>>Contrast/Bolus Start Time (0018,1042) 3 Time of start of administration.
>>Contrast/Bolus Stop Time (0018,1043) 3 Time of end of administration.
>>Contrast Flow Rate (0018,1046) 3 Rate of administration in milliliters/sec. Only a single value shall be present.
>>Contrast Flow Duration (0018,1047) 3 Duration of injection in seconds. Only a single value shall be present.

C.7.6.4b.1 Enhanced Contrast/Bolus Module Attributes

C.7.6.4b.1.1 Contrast/Bolus Ingredient Opaque for X-Ray equipment

Contrast/Bolus Ingredient Opaque (0018,9425) attribute specifies the type of relative X-Ray absorption of the contrast/bolus ingredient, compared to the X-Ray absorption of water. The the meaning for the Enumerated Values are:

YES The contrast/bolus ingredient absorbs more X-Ray photons than water;

NO The contrast/bolus ingredient absorbs less X-Ray photons than water;

Note: The Contrast/Bolus Ingredient Opaque (0018,9425) attribute determines the sign of the gradient of X-Ray beam intensity from inside to outside the injected vessel, thus allowing optimal settings of the image processing applications (e.g. vessel edge detection, etc.), see Figure C.7.6.4b-1.

The relative gray level of the injected vessel with respect to the gray level of the water of Pixel Data (7FE0,0010) is determined by the Contrast/Bolus Ingredient Opaque (0018,9425) and by the Pixel Intensity Relationship Sign (0028,1041). For example, if the contrast/bolus ingredient is more radio graphically dense than water (i.e. YES), and the Pixel Intensity Relationship Sign (0028,1041) is -1, then the contrast/bolus ingredient is represented by higher values of Pixel Data than water.

[pic]

Figure C.7.6.4b-1X-Ray beam intensity vs. Contrast/Bolus Ingredient Opaque