US Multi-frame ImageCIOD
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VL Endoscopic ImageCIOD
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Grayscale Softcopy Presentation StateCIOD
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Basic Voice Audio WaveformCIOD
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PatientMModule - Patient
Clinical Trial SubjectUModule - Patient
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Clinical Trial StudyUModule - Study
General SeriesMModule - Series
Clinical Trial SeriesUModule - Series
Enhanced SeriesMModule - Series
CT Protocol SeriesMModule - Series
Frame of ReferenceMModule - Frame of Reference
General EquipmentMModule - Equipment
Enhanced General EquipmentMModule - Equipment
Protocol ContextMModule - Procedure Protocol
Patient Protocol ContextUModule - Procedure Protocol
InstructionsUModule - Procedure Protocol
Patient PositioningUModule - Procedure Protocol
(0008,2218) Anatomic Region Sequence2Sequence
(0008,2228) Primary Anatomic Structure Sequence2Sequence
(0018,991B) Patient Positioning Instruction Sequence3Sequence
(0018,991C) Positioning Method Code Sequence3Sequence
(0018,991D) Positioning Landmark Sequence3Sequence
(0018,991E) Target Frame of Reference UID3Unique Identifier
(0018,9947) Protocol Defined Patient Position1Code String
(0020,103F) Target Position Reference Indicator3Long String
Performed CT AcquisitionUModule - Procedure Protocol
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CT Defined Procedure ProtocolCIOD
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Built with by Innolitics, a team of medical imaging software developers.

Data synced with official DICOM standard on 12 May 2020. The DICOM Standard is under continuous maintenance, and the current official version is available at DICOM Parts 3, 4, and 6, © NEMA. Please note that the most recent PDF version of the standard is the official reference, and should checked when making technical decisions.

Protocol Defined Patient Position Attribute

TypeRequired (1)
Value Multiplicity1
Value RepresentationCode String (CS)

Patient position relative to the equipment described by the procedure protocol.

See Section C. for Defined Terms and further explanation.

Section C.

C. Patient Position

Patient Position (0018,5100) specifies the position of the patient relative to the imaging equipment space. This Attribute is intended for annotation purposes only. It does not provide an exact mathematical relationship of the patient to the imaging equipment.

When multiple subjects are present in the same image, and arranged with different positions, then the Patient Position (0018,5100) in the General Series Module is nominal, does not apply to each subject, but does define the relationship of the nominal Patient-Based Coordinate System to the machine.


In conjunction with the Patient Position (0018,5100) in each Item of the Group of Patients Identification Sequence (0010,0027), Patient Position (0018,5100) in the General Series Module may be helpful to compute patient-relative spatial information for each subject from the Attributes of the Image Plane Module.

When facing the front of the imaging equipment, Head First is defined as the patient's head being positioned toward the front of the imaging equipment (i.e., head entering the front of the equipment). Feet First is defined as the patient's feet being positioned toward the front of the imaging equipment (i.e., feet entering the front of the equipment). Left First is defined as the patient's left side being positioned towards the front of the imaging equipment (i.e., patient's left side entering the front of the equipment). Right First is defined as the patient's right being positioned towards the front of the imaging equipment (i.e., patient's right side entering the front of the equipment). Prone is defined as the patient's face being positioned in a downward (gravity) direction. Supine is defined as the patient's face being in an upward direction. Decubitus Right is defined as the patient's right side being in a downward direction. Decubitus Left is defined as the patient's left side being in a downward direction.

Defined Terms:


Head First-Prone


Head First-Supine


Head First-Decubitus Right


Head First-Decubitus Left


Feet First-Decubitus Right


Feet First-Decubitus Left


Feet First-Prone


Feet First-Supine


Left First-Prone


Left First-Supine


Right First-Prone


Right First-Supine


Anterior First-Decubitus Right


Anterior First-Decubitus Left


Posterior First-Decubitus Right


Posterior First-Decubitus Left


  1. For quadrupeds, separate concepts for ventral and dorsal are not introduced, rather it is expected that anterior and posterior will be considered synonymous as they are when applied to the trunk.

  2. There are no decubitus variants of left or right first, since for imaging equipment that is aligned horizontally with respect to gravity the patient cannot be both decubitus and have the left or right side towards the front of the imaging equipment.

  3. There are no prone or supine variants of anterior or posterior first, since for imaging equipment that is aligned horizontally with respect to gravity the patient cannot be prone or supine and have the anterior or posterior side towards the front of the imaging equipment.

The Figure C. illustrates some of these Defined Terms for imaging equipment with a table, such as in X-Ray Angiography. The orientation of the patient related to gravity is always recumbent.

Figure C. Representation of the Eight Different Patient Positions on the X-Ray Table

Figure C. Example of Right First-Prone (RFP) Patient Position Relative to the Gantry and Table for a Small Animal