DICOM PS3.3 2021c - Information Object Definitions

10.40 Patient Support Position Macro (Current)
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## 10.40 Patient Support Position Macro

This Macro provides the device-specific geometric settings for the Patient Support device.

The information is intended for display to human readers and to support non-image-based patient positioning; however, the definition of the patient position with respect to the device is contained in the Image to Equipment Mapping Matrix (0028,9520).

Table 10.40-1. Patient Support Position Macro Attributes

Attribute Name | Tag | Type | Attribute Description
--- | --- | --- | ---
Patient Support Position Specification Method | (300A,065C) | 1 | Method of specification for patient support parameters. Enumerated Values: ABSENT No parameters are specified. GLOBAL Parameters are specified using a globally known method, irrespective of the device in use. DEVICE_SPECIFIC Parameters are specified using a device-specific method.
Patient Support Position Device Parameter Sequence | (300A,065D) | 1C | Translational and rotational parameters for Patient Support devices. Required if Patient Support Position Specification Method (300A,065C) does not equal ABSENT. One or more Items shall be included in this Sequence if Patient Support Position Specification Method (300A,065C) equals DEVICE_SPECIFIC. Only one Item shall be included in this Sequence if Patient Support Position Specification Method (300A,065C) equals GLOBAL.
>Referenced Device Index | (300A,0607) | 1C | The value of Device Index (3010,0039) in Patient Support Devices Sequence (300A,0686) corresponding to the Patient Support Device in use. Required if Patient Support Position Specification Method (300A,065C) equals DEVICE_SPECIFIC.
>Device Order Index | (300A,065E) | 1C | Index defining the order in which the Items in the Patient Support Position Device Parameter Sequence (300A,065D) are applied. The value shall start at 1 and increase monotonically by 1. Required if Patient Support Position Specification Method (300A,065C) equals DEVICE_SPECIFIC. See Section 10.40.1.
>Patient Support Position Parameter Sequence | (300A,065B) | 1 | Translational and rotational parameters for a particular Patient Support device. One or more Items shall be included in this Sequence.
>>Patient Support Position Parameter Order Index | (300A,065F) | 1C | Index defining the order in which the Items in the Patient Support Position Parameter Sequence (300A,065B) are applied. The value shall start at 1 and increase monotonically by 1. Required if Patient Support Position Specification Method (300A,065C) equals DEVICE_SPECIFIC. See Section 10.40.1.
>>Include Table 10-2 “Content Item Macro Attributes Description”. | DTID 15302 “Patient Support Position Parameters”.

### 10.40.1 Position Parameters and Order Index

The Device Order Index (300A,065E) and the Patient Support Position Parameter Order Index (300A,065F) are applied sequentially, meaning all the Items in a Patient Support Position Parameter Sequence (300A,065B) are applied before proceeding to the Item in the Patient Support Position Device Parameter Sequence (300A,065D) specified by the next Device Order Index (300A,065E) value.

A vendor may specify codes that are not included in TID 175001 and/or a set of codes which is not identical with the set defined in Section 10.40.1.1 or Section 10.40.1.2. The vendor shall document the codes used in this Macro in the Conformance Statement, as well as the corresponding parameters, their geometric interpretation, and the order in which they will be applied. These parameters shall use UCUM units of mm for lengths and degrees for angles.

#### 10.40.1.1 IEC 61217 Patient Support Device

Devices using the IEC 61217 coordinate systems to define geometric settings for the Patient Support device shall use the codes in Table 10.40-2 in the order specified in column Patient Support Position Parameter Order Index (300A,065F). Other codes shall not be used.

Table 10.40-2. Isocentric Patient Support Position Parameter Order Index

Code Value (0008,0100) | Code Meaning (0008,0104) | Patient Support Position Parameter Order Index (300A,065F)
--- | --- | ---
126801 | IEC61217 Patient Support Continuous Yaw Angle | 1
126806 | IEC61217 Table Top Lateral Position | 2
126807 | IEC61217 Table Top Longitudinal Position | 3
126808 | IEC61217 Table Top Vertical Position | 4
126802 | IEC61217 Table Top Support Continuous Pitch Angle | 5
126803 | IEC61217 Table Top Support Continuous Roll Angle | 6

#### 10.40.1.2 Isocentric Patient Support Device

Devices using an isocentric representation to define geometric settings for the Patient Support device shall use the codes in Table 10.40-3 in the order specified in column Patient Support Position Parameter Order Index (300A,065F). Other codes shall not be used.

Table 10.40-3. Isocentric Patient Support Position Parameter Order Index

Code Value (0008,0100) | Code Meaning (0008,0104) | Patient Support Position Parameter Order Index (300A,065F)
--- | --- | ---
126814 | Isocentric Patient Support Continuous Yaw Angle | 1
126812 | Isocentric Patient Support Continuous Pitch Angle | 2
126813 | Isocentric Patient Support Continuous Roll Angle | 3
126815 | Isocentric Patient Support Lateral Position | 4
126816 | Isocentric Patient Support Longitudinal Position | 5
126817 | Isocentric Patient Support Vertical Position | 6

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DICOM PS3.3 2021c - Information Object Definitions