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(0018,9920) Acquisition Protocol Element Sequence2Sequence
(0018,1120) Gantry/Detector Tilt1Decimal String
(0018,1130) Table Height1Decimal String
(0018,11C1) Requested Series Description Code Sequence3Sequence
(0018,9004) Content Qualification3Code String
(0018,9302) Acquisition Type1Code String
(0018,9303) Tube Angle1CDouble
(0018,9305) Revolution Time1CDouble
(0018,9306) Single Collimation Width1Double
(0018,9307) Total Collimation Width1Double
(0018,9309) Table Speed1Double
(0018,9310) Table Feed per Rotation1Double
(0018,9311) Spiral Pitch Factor1Double
(0018,9325) CT X-Ray Details Sequence1Sequence
(0018,9333) Constant Volume Flag1Code String
(0018,9334) Fluoroscopy Flag1Code String
(0018,9345) CTDIvol1CDouble
(0018,9346) CTDI Phantom Type Code Sequence1CSequence
(0018,9921) Protocol Element Number1Unsigned Short
(0018,9922) Protocol Element Name2Long String
(0018,9923) Protocol Element Characteristics Summary3Unlimited Text
(0018,9924) Protocol Element Purpose3Unlimited Text
(0018,9930) Acquisition Motion1Code String
(0018,9931) Acquisition Start Location Sequence3Sequence
(0018,9932) Acquisition End Location Sequence3Sequence
(0018,9937) Requested Series Description3Long String
(0018,9942) CTDIvol Notification Trigger3Double
(0018,9943) DLP Notification Trigger3Double
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Acquisition Protocol Element Sequence Attribute

Tag(0018,9920)
TypeRequired, Empty if Unknown (2)
KeywordAcquisitionProtocolElementSequence
Value Multiplicity1
Value RepresentationSequence (SQ)

Parameter values for each Protocol Element in the acquisition protocol. Each Item in the Sequence describes one Element. Elements are performed in the order of their Protocol Element Number (0018,9921).

See Section C.34.9.1.

Zero or more Items shall be included in this Sequence.

Section C.34.9.1

C.34.9.1 Acquisition Protocol Elements

A Protocol usually includes more than one Acquisition Protocol Element. For example, a chest Protocol in CT might include three elements in total: two localizer CT radiographs (AP and Lateral), and a single helical scan.

An illustrative example for CT is provided in Table C.34.9-2. In this example, since all parameters will be nested inside an Acquisition Protocol Element Sequence (0018,9920) and some of the parameters will be further nested inside a CT X-Ray Details Sequence (0018,9325), close attention must be paid to the use of the Selector Sequence Pointer (0072,0052) in the Attribute Value Constraint Macro.

Table C.34.9-2. Example Usage of Selector Macro Attributes for Acquisition Constraints

Example

Selector Attribute (0072,0026)

Selector Value Number (0072,0028)

Selector Sequence Pointer (0072,0052)

Selector Sequence Pointer Items (0074,1057)

Example Constraint

Constrain the value of Element Name (0018,9922) of the first Item in the Acquisition Protocol Element Sequence (0018,9920)

(0018,9922)

1

(0018,9920)

1

EQUAL"Localizer (AP) "

Constrain the value of Table Speed (0018,9309) of the second Item in the Acquisition Protocol Element Sequence (0018,9920)

(0018,9309)

1

(0018,9920)

2

EQUAL14 mm/sec

Constrain the value of KVP (0018,0060) of the first beam in the CT X-Ray Details Sequence (0018,9325) of the second Item in the Acquisition Protocol Element Sequence (0018,9920)

(0018,0060)

1

(0018,9920), (0018,9325)

2\1

RANGE_INCL(120,140)

Constrain the first and second value of Exposure Modulation Type (0018,9323) of the second beam in the CT X-Ray Details Sequence (0018,9325) of the third Item in the Acquisition Protocol Element Sequence (0018,9920)

(0018,9323)

1

(0018,9920), (0018,9325)

3\2

EQUAL"ANGULAR"

(0018,9323)

2

(0018,9920), (0018,9325)

3\2

EQUAL"ORGAN_BASED"