Материал: part17

Table JJJJ.5.2.1-10. Multi-energy CT Processing Attributes​

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KKKK Encoding Quantitative Image Family​

Parameters (Informative)​

KKKK.1 Encoding of Quantitative Image Family Parameters With RWVM​

In this example, the real-world value mapped pixel value represents attenuation of water. The pixel values range from 0 to 4095 like​ a conventional CT Image and are mapped starting from -1024.​

Table KKKK.1-1. Example Material Specific Images for the Real World Value Mapping Macro​

This example shows how to use the Table C.7.6.16-12b “Real World Value Mapping Item Macro Attributes” in PS3.3 to describe pixel​ values of the encoding of Quantitative Image Family parameters, by adding coded concepts to the RWVM that describe the material,​ the method and the value range in case of Value-based images.​

In this example, a Value-based material map image has been created where pixel values between 0 and 20 correspond to voxels​ that are associated with Uric Acid and pixel values between 20 and 40 correspond to voxels that are associated with Calcium:​

•​In the Quantity Definition Sequence (105590001, SCT, "Substance") is used to indicate that the pixel value in the specified range​ is deemed to represent the presence of that substance, regardless of the actual pixel value within that range. It would be inappro-​ priate to use (246205007, SCT, "Quantity") since the transformed pixel values do not represent a quantitative value.​

•​Themeasurementmethodof(113250,DCM,"Value-basedmaterialimage")mightbereplacedbyamorespecificcodethatactually​ described the method of computation such as "Gaussian distribution".​

•​For the sake of illustration, in this image a pixel value of 20 maps to both "Uric Acid" and "Calcium".​

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Page 864​ DICOM PS3.17 2020a - Explanatory Information​

Table KKKK.1-2. Example Value Based Images for the Real World Value Mapping Macro​

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LLLL Imaging Agent Administration Report​

Template (Informative)​

LLLL.1 Purpose of this Annex​

This Annex describes some use cases of the contrast agent administration reporting. The contrast agent administration report object​ records the planned and performed delivery of contrast agents.​

A Planned Imaging Agent Administration SR object is intended for representing the plan or program to deliver contrast agent to the​ patient for a contrast study. It could be prepared and customized for a patient by the radiologist, prior to the study. The plan may also​ be altered by the operating technologist prior to the study. For example, the injection plan might be adjusted for patient's condition​ such as weight. The plan is then loaded into the injector system to be performed.​

A Performed Imaging Agent Administration SR object is for reporting the actual program that was used to deliver the contrast agent​ during the study. During the study, the contrast-delivery system may alter the original delivery plan as a result of events that occur​ during the delivery of Imaging Agent such as limiting the flow rate due to high pressure, aborting the injection due to adverse events,​ etc. The Performed Image Agent Administration SR is then saved.​

The infusion manager sends the Performed Imaging Agent Administration SR to the PACS and optionally to other destinations like​ an acquisition modality, RIS, or reporting system.​

Figure LLLL.1-1 illustrates possible consumers of the Performed Imaging Agent Administration SR object (referred as "Imaging Agent​ Administration SR" in the figure) post administration.​

Figure LLLL.1-1. Possible Consumers of the Performed Imaging Agent Administration SR Object​

LLLL.2 Use Cases​

Note​

In the following use cases, the word event means a combination of injector and adverse events.​

LLLL.2.1 Use Case 1 - Manual Bolus Injection​

The use case shown in Figure LLLL.2-1 is an example of how a performed object can capture a manual contrast infusion. The oper-​ ator performs a manual administration of contrast for a study. The operator selects the patient from the contrast infusion manager​ (available through modality worklist) and reports the minimum parameters about the injection. The contrast infusion manager then​ generates a Performed Imaging Administration SR object and sends to the Contrast Usage Consumer such as PACS.​

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