C.36.2.4.7 MV Radiation Image Acquisition Parameters Macro

C.36.2.4.7 MV Radiation Image Acquisition Parameters Macro (Current)
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The MV Radiation Image Acquisition Parameters Macro contains parameters specifying details of X-Ray generation for image acquisition using MV-level radiation.

Table C.36.2.4.7-1. MV Radiation Image Acquisition Parameters Macro Attributes

Attribute Name	Tag	Type	Attribute Description
Energy Derivation Code Sequence	(3002,0133)	1C	How the value of imaging energy is derived from the device configuration. Required if Radiation Generation Mode Sequence (300A,067B) is not present. Only a single Item shall be included in this Sequence. See Section C.36.2.4.7.1.1.
>Include Table 8.8-1 “Code Sequence Macro Attributes”			BCID 9262 “Energy Derivation Types”.
Radiation Generation Mode Sequence	(300A,067B)	2C	The beam parameters of the imaging energy. Required if Energy Derivation Code Sequence (3002,0133) is not present. Zero or one Items shall be included in this Sequence. See Section C.36.2.4.7.1.1.
>Include Table C.36.2.2.7-1 “Radiation Generation Mode Macro Attributes”			DCID 9525 “Radiation Therapy Particle” for Radiation Type Code Sequence (300A,067F). DCID 9521 “Radiotherapy Treatment Energy Unit” for Energy Unit Code Sequence (300A,0684). DCID 9549 “Radiation Generation Mode Type” for Radiation Fluence Modifier Code Sequence (300A,0683). The Number of Radiation Generation Modes (300A,0685) shall have the value one.
Maximum Cumulative Meterset Exposure	(3002,0134)	3	The maximum allowed exposure described in Meterset values between start and stop of acquisition. The radiation shall be stopped at latest when the difference between the start value and the current value exceeds this value. The unit is defined in the Radiation Dosimeter Unit Sequence (300A,0658).
Radiation Dosimeter Unit Sequence	(300A,0658)	1C	Measurement unit of the machine dosimeter. Required if Maximum Cumulative Meterset Exposure (3002,0134) is present. Only a single Item shall be included in this Sequence.
>Include Table 8.8-1 “Code Sequence Macro Attributes”			DCID 9269 “RT Radiation Meterset Units”
Delivery Rate	(300A,063D)	2C	The nominal rate of delivery of the Meterset during acquisition. Required if the acquisition is not taken simultaneously during the delivery of the therapeutic radiation. The unit is defined in the Delivery Rate Unit Sequence (300A,063E).
Delivery Rate Unit Sequence	(300A,063E)	1C	The unit of a delivery rate value. Required if Delivery Rate (300A,063D) is present and has a value. Only a single Item shall be included in this Sequence.
>Include Table 8.8-1 “Code Sequence Macro Attributes”			No Baseline CID defined.

C.36.2.4.7.1 MV Radiation Image Acquisition Parameters Macro Attribute Description

C.36.2.4.7.1.1 Energy-related Attributes

The Imaging Energy can be described in either Energy Derivation Code Sequence (3002,0133) or Radiation Generation Mode Sequence (300A,067B).

When the Radiation Generation Mode Sequence (300A,067B) is present with zero Items, the imaging energy may be defined as follows:

When the acquisition occurs before or after the therapeutic radiation delivery, the energy may be defined by the imaging protocol or set by the user.
When the acquisition occurs during the therapeutic radiation delivery, the energy is defined by parameters set for the therapeutic beam.

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