TID 10012 CT Accumulated Dose Data

TID 10012 CT Accumulated Dose Data (Current)
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This general Template provides detailed information on CT X-Ray dose value accumulations over several irradiation events from the same equipment and over the scope of accumulation specified for the report (typically a Study or a Performed Procedure Step).

Type:: Extensible
Order:: Significant
Root:: No

Table TID 10012. CT Accumulated Dose Data

	NL	Rel with Parent	VT	Concept Name	VM	Req Type	Condition	Value Set Constraint
1			CONTAINER	EV (113811, DCM, "CT Accumulated Dose Data")	1	M
2	>	CONTAINS	NUM	EV (113812, DCM, "Total Number of Irradiation Events")	1	M		UNITS = EV ({events}, UCUM, "events")
3	>	CONTAINS	NUM	EV (113813, DCM, "CT Dose Length Product Total")	1	M		UNITS = EV (mGy.cm, UCUM, "mGy.cm")
3a	>	CONTAINS	NUM	EV (130745, DCM, "CT Dose Length Product Sub-Total")	2-n	UC	IFF irradiation events within the scope of accumulation use different phantoms for estimating the recorded per-event DLP (i.e., the values of TID 10013 “CT Irradiation Event Data” Row 23 are not all the same).	UNITS = EV (mGy.cm, UCUM, "mGy.cm")
3b	>>	HAS PROPERTIES	CODE	EV (113835, DCM, "CTDIw Phantom Type")	1	M		DCID 4052 “Phantom Device”
4	>	CONTAINS	NUM	EV (113814, DCM, "CT Effective Dose Total")	1	U		UNITS = EV (mSv, UCUM, "mSv")
5	>>	HAS PROPERTIES	TEXT	EV (121406, DCM, "Reference Authority")	1	MC	XOR Row 6
6	>>	HAS PROPERTIES	CODE	EV (121406, DCM, "Reference Authority")	1	MC	XOR Row 5	DCID 10015 “CT Dose Reference Authority”
7	>>	HAS CONCEPT MOD	CODE	EV (370129005, SCT, "Measurement Method")	1	M		DCID 10011 “Effective Dose Evaluation Method”
8	>>	HAS PROPERTIES	TEXT	EV (113815, DCM, "Patient Model")	1	MC	IF the value of Row 7 = (113800, DCM, "DLP to E conversion via MC computation") or equals (113801, DCM, "CTDIfreeair to E conversion via MC computation")
9	>>	HAS PROPERTIES	CONTAINER	EV (113816, DCM, "Condition Effective Dose measured")	1	MC	IF the value of Row 7 = (113802, DCM, "DLP to E conversion via measurement") or equals (113803, DCM, "CTDIfreeair to E conversion via measurement")
10	>>>	CONTAINS	TEXT	EV (113817, DCM, "Effective Dose Phantom Type")	1	M
11	>>>	CONTAINS	TEXT	EV (113818, DCM, "Dosimeter Type")	1	M
12	>	CONTAINS	TEXT	EV (121106, DCM, "Comment")	1	U
13	>	CONTAINS	INCLUDE	DTID 1021 “Device Participant”	1	MC	Required if the irradiating device is not the recording device and the dose was accumulated on a single device.	$DeviceProcedureRole = EV (113859, DCM, "Irradiating Device")

Content Item Descriptions

Row 2	Total Number of CT irradiation events. A CT irradiation event is one continuous irradiation procedure and is defined through consistent acquisition parameters. In the case of dose modulation the calculations are based on the effective parameters (e.g., the effective mA recorded in the Mean X-Ray Tube Current), and these acquisition parameters are consistent.
Row 3	The Dose Length Product (DLP) is calculated for every irradiation event. The Dose Length Product Total is the sum of the DLP values. The calculation is based on the CTDI_vol result of each irradiation event. If the individual DLP values are calculated using different phantoms, the separate per-phantom sub-totals may be encoded in Row 3a.
Row 3a	The sum of the per-event DLP values with the specified phantom.
Row 3b	The phantom used for the phantom-specific sub-total DLP estimate; shall be that specified at the irradiation event level in TID 10013 “CT Irradiation Event Data” Row 23 for the events included in the sub-total.
Row 4	Effective dose (E, in units of mSv) evaluated as a total over the scope is defined in Row 6 of TID 10011 “CT Radiation Dose”. Effective dose is defined by the reference in Rows 5 or 6 of this Template. It may be calculated from a product of DLP and an 'Effective Dose Conversion Factor' (E/DLP). Or it may be calculated from a product of the Mean CTDIfreeair and the ratio E/CTDIfreeair. The ratios E/DLP or E/CTDIfreeair may be evaluated either from computer simulations applying Monte Carlo (MC) sampling techniques or from dosimetric measurements in an anthropomorphic phantom, e.g., the Alderson-Rando phantom.. The specific method used is identified in Rows 7 through 11.
Rows 5, 6	Reference of the base publication defining the Effective Dose, either as a coded value, or a textual bibliographic reference. ICRP Publications shall be referenced using their assigned coded values.
Row 7	Description of the method used for Effective Dose evaluations.
Row 8	Description of the reference-patient mathematical or computational model used when Effective Dose is derived via Monte Carlo simulations of radiation transport in such models. Examples of publications that specify particular reference patient models are NUREG/CR-1159, ORNL/NUREG/TM-367 (1980); NRPB-R186 (1985); GSF-Bericht S-885 (1986); Fill et al., Health Physics Vol. 86 (3): 253-272 (2004).
Row 9	Description of the condition Effective Dose measured
Row 10	Type of Effective Dose phantom used, e.g., Alderson-Rando
Row 11	Type of dosimeter used, e.g., TLD (Thermo Luminescence Dosimeter)
Row 13	The device that produced the irradiation accumulated in this Template. I.e., the CT Scanner. This is not required to be present if the information is the same as that already recorded in TID 1004 “Device Observer Identifying Attributes” encoded via the inclusion of TID 1002 “Observer Context” in TID 10011 “CT Radiation Dose” Row 4, which in turn may be absent if identical to the content in the Enhanced General Equipment Module, or if more than one device produced the accumulated irradiation.