GGGG.2 Dual-source CT Organ Radiation Dose Example

GGGG.2 Dual-source CT Organ Radiation Dose Example (Current)
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The following example shows the report of the organ dose calculated for a dual-source CT scan.

The calculation uses a Radiation Dose SR provided by a CT system that has dual X-Ray tubes. The Radiation Dose SR is created during the acquisition of Neck DE_CAROTID CT scan of an adult male of 75 kg and 165 cm height.

The dose calculations are performed on the CT system. The dose calculation application generates a Patient Radiation Dose Structured Report document and a Dose Point Cloud containing an image of the dose distribution for the patient model.

The dose calculation application uses the following settings and assumptions:

RDSR Source Data:
- The Irradiation Events associated with the CT Localizer Radiograph are excluded.
- The Irradiation Event UID from the helical CT series is used in the calculation of the organ dose.
Patient Model:
- The patient model is a stylized anthropomorphic model of the patient.
- Organs are represented by simple geometric shapes described by mathematical equations. The parameters of the equations describing the location, shape, and dimension of the organs are stored in a DICOM SOP Instance.
- In this example the gender and age of the patient are used to select the appropriate phantom from the existing phantom library.
Patient Model Registration:
- Image Content-based Alignment between the CT images Frame of Reference and the 3D stylized model Frame of Reference is used for registration.
Beam Attenuators:
- Additional Aluminum filtration is used in the methodology and the equivalent HVL for the scanner model used in the method is given.

Table GGGG.2-1. Dual-source CT Organ Radiation Dose Example

Node	Code Meaning of Concept Name	Code or Example Value	Comment
1	Patient Radiation Dose Report		TID 10030
1.1	Language of Content Item and Descendants	(En, IETF4646, "English")	TID 1204
1.1.1	Country of Language	(CA, ISO3166_1, "Canada")	TID 1204
1.2	Observer Type	(121007, DCM, "Device")	TID 1002
1.3	Device Observer UID	2.13.4.5.2.33.5	TID 1004
1.4	Device Observer Name	RUMC-213	TID 1004
1.5	Device Observer Manufacturer	Manufacturer DEX	TID 1004
1.6	Device Observer Model Name	Scanner 4500	TID 1004
1.7	Radiation Dose Estimate		TID 10031
1.7.1	Radiation Dose Estimate Name	Dual-source Neck DE_CAROTID CT scan Tube A&B	TID 10031
1.7.2	Comment	Tube A and B combined	TID 10031
1.7.3	Radiation Dose Estimation Methodology		TID 10033
1.7.3.1	SR Instance Used		TID 10033
1.10.3.1	SR Instance Used		Radiation Dose SR
1.10.3.1.1	SOP Class UID	1.2.840.1008.5.1.4.1.1.88.67
1.10.3.1.2	SOP Instance UID	1.2.3.4.566.77.1
1.7.3.1.1	Event UID Used	1.3.12.2.xxxxxx	TID 10033
1.7.3.2	Patient Radiation Dose Model		TID 10033
1.7.3.2.1	Patient Model Type	(128404, DCM, "Anthropomorphic Model")	TID 10033
1.7.3.2.2	Radiation Transport Model Type	(128421, DCM, "Geometric Radiation Transport Model")	TID 10033
1.7.3.2.3	Patient Radiation Dose Model Data	< UID of "Patient Radiation Dose Model Data">	TID 10033
1.7.3.2.3	Patient Radiation Dose Model Data		Parametric map
1.7.3.2.3.1	SOP Class UID	1.2.840.1008.5.1.4.1.1.30
1.7.3.2.3.2	SOP Instance UID	1.2.5.4.6.677
1.7.3.2.4	Patient Radiation Dose Model Reference	Cristy et al. 1987	TID 10033
1.7.3.2.5	Patient Model Demographics		TID 10033
1.7.3.2.5.1	Model Minimum Age	18 (a, UCUM, "year")	TID 10033
1.7.3.2.5.2	Model Maximum Age	18 (a, UCUM, "year")	TID 10033
1.7.3.2.5.3	Model Patient Sex	(M, DCM, "Male")	TID 10033
1.7.3.2.5.4	Model Minimum Weight	75 (kg, UCUM, "kilogram")	TID 10033
1.7.3.2.5.5	Model Maximum Weight	75 (kg, UCUM, "kilogram")	TID 10033
1.7.3.2.5.6	Model Minimum Height	165 (cm, UCUM, "Centimeter")	TID 10033
1.7.3.2.5.7	Model Maximum Height	165 (cm, UCUM, "Centimeter")	TID 10033
1.7.3.2.6	Patient Model Registration		TID 10033
1.7.3.2.6.1	Registration Method	(125024, DCM, "Image Content-based Alignment")	TID 10033
1.7.3.2.6.2	Spatial Registration	<UID of "Spatial Registration">	TID 10033
1.7.3.2.6.2.1	SOP Class UID	1.2.840. 1008.5.1.4.1.1.66.1
1.7.3.2.6.2.2	SOP Instance UID	1.4.9.87.11.223.5
1.7.3.3	X-Ray Beam Attenuator		TID 10033
1.7.3.3.1	Attenuator Category	(113771, DCM, "X-Ray Filters")	TID 10033
1.7.3.3.2	Equivalent Attenuator Material	(12503006, SCT, "Aluminum")	TID 10033
1.7.3.3.3	Equivalent Attenuator Thickness	1.4 (mm, UCUM, "Millimeter")	TID 10033
1.7.3.3.4	Attenuator Description	Mean equivalent Aluminum thickness of bowtie filter	TID 10033
1.7.3.3.5	X-Ray Beam Attenuator Model		TID 10033
1.7.3.3.5.1	Radiation Transport Model Type	(128421, DCM, "Geometric Radiation Transport Model")	TID 10033
1.7.3.4	Radiation Dose Estimate Method		TID 10033
1.7.3.4.1	Radiation Dose Estimate Method Type	(D009010, MSH, "Monte Carlo")	TID 10033
1.7.3.4.2	Radiation Dose Estimate Parameters		TID 10034
1.7.3.4.2.1	(111634, DCM, "Half Value Layer")	8.5 (mm, UCUM, "Millimeter")	TID 10034
1.7.3.4.3	Radiation Dose Estimate Method Reference	Simulation package XX version YY	TID 10033
1.7.4	Radiation Dose Estimate Representation		TID 10032
1.7.4.1	Distribution Representation	(128496, DCM, "Dose Point Cloud")	TID 10032
1.7.4.2	Radiation Dose Representation Data		TID 10032
1.7.3.2.3.1	SOP Class UID	1.2.840.1008.5.1.4.1.1.30	Parametric Map
1.7.3.2.3.2	SOP Instance UID	1.87.2.3.4.11.3
1.7.4.3	Organ	(38266002, SCT, "Entire Body")	TID 10032
1.7.5	Organ Radiation Dose Information		TID 10031
1.7.5.1	Organ	(39607008, SCT, "Lung")	TID 10031
1.7.5.1.1	(128533, DCM, "Mean Absorbed Radiation Dose")	9.6 (mGy, UCUM, "mGy")	TID 10031