DICOM PS3.3 2018a - Information Object Definitions

C.8.13 Enhanced MR Image
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### C.8.13 Enhanced MR Image

This section describes the specific modules for the Enhanced MR Image IOD.

#### C.8.13.1 Enhanced MR Image Module

This section describes the Enhanced MR Image Module.

Table C.8-79 specifies the attributes of the Enhanced MR Image module.

Table C.8-79. Enhanced MR Image Module Attributes

Attribute Name | Tag | Type | Attribute Description
--- | --- | --- | ---
Include Table C.8-83 “MR Image and Spectroscopy Instance Macro Attributes” |
Image Type | (0008,0008) | 1 | Image characteristics. See Section C.8.16.1 and Section C.8.13.1.1.1.
Include Table C.8-131 “Common CT/MR Image Description Macro Attributes” |
Include Table C.8-84 “MR Image Description Macro Attributes” |
Samples per Pixel | (0028,0002) | 1 | Number of samples (planes) in this image. For Enumerated Values See Section C.8.13.1.1.2.
Photometric Interpretation | (0028,0004) | 1 | Specifies the intended interpretation of the pixel data. Enumerated Values are specified in the IOD that invokes this Module. See Section C.7.6.3.1.2 for definition of this term.
Bits Allocated | (0028,0100) | 1 | Number of bits allocated for each pixel sample. Each sample shall have the same number of bits allocated. For Enumerated Values See Section C.8.13.1.1.2.
Bits Stored | (0028,0101) | 1 | Number of bits stored for each pixel sample. Each sample shall have the same number of bits stored. For Enumerated Values See Section C.8.13.1.1.2.
High Bit | (0028,0102) | 1 | Most significant bit for pixel sample data. Each sample shall have the same high bit. Shall be one less than the value in Bits Stored (0028,0101).
Pixel Representation | (0028,0103) | 1 | Data representation of the pixel samples. Each sample shall have the same pixel representation. For Enumerated Values See Section C.8.13.1.1.2
Planar Configuration | (0028,0006) | 1C | Indicates whether the pixel data are encoded color-by-plane or color-by-pixel. Required if Samples per Pixel (0028,0002) has a value greater than 1. See Section C.7.6.3.1.3 and Section C.8.13.1.1.2 for further explanation.
Burned In Annotation | (0028,0301) | 1C | Indicates whether or not the image contains sufficient burned in annotation to identify the patient and date the image was acquired. Enumerated Values: NO This means that images that contain this Module shall not contain such burned in annotations. Required if SOP Class UID is not "1.2.840.10008.5.1.4.1.1.4.4" (Legacy Converted), may be present otherwise.
Recognizable Visual Features | (0028,0302) | 3 | Indicates whether or not the image contains sufficiently recognizable visual features to allow the image or a reconstruction from a set of images to identify the patient. Enumerated Values: YES NO If this Attribute is absent, then the image may or may not contain recognizable visual features.
Lossy Image Compression | (0028,2110) | 1C | Specifies whether an Image has undergone lossy compression (at a point in its lifetime). Enumerated Values: 00 Image has NOT been subjected to lossy compression. 01 Image has been subjected to lossy compression. Once this value has been set to 01 it shall not be reset. See Section C.7.6.1.1.5. Required if SOP Class UID is not "1.2.840.10008.5.1.4.1.1.4.4" (Legacy Converted). May be present otherwise.
Lossy Image Compression Ratio | (0028,2112) | 1C | Describes the approximate lossy compression ratio(s) that have been applied to this image. See Section C.7.6.1.1.5.2. Required if Lossy Image Compression (0028,2110) is "01".
Lossy Image Compression Method | (0028,2114) | 1C | A label for the lossy compression method(s) that have been applied to this image. See Section C.7.6.1.1.5.1. Required if Lossy Image Compression (0028,2110) is "01".
Presentation LUT Shape | (2050,0020) | 1C | Specifies an identity transformation for the Presentation LUT, such that the output of all grayscale transformations defined in the IOD containing this Module are defined to be P-Values. Enumerated Values: IDENTITY output is in P-Values. Required if Photometric Interpretation (0028,0004) is MONOCHROME2.
Icon Image Sequence | (0088,0200) | 3 | This icon image is representative of the Image. Only a single Item is permitted in this Sequence.
>Include Table C.7-11b “Image Pixel Macro Attributes” | See Section C.7.6.1.1.6.
Include Table 10-25 “Optional View and Slice Progression Direction Macro Attributes” |

##### C.8.13.1.1 Enhanced MR Image Module Attribute Description

###### C.8.13.1.1.1 Image Type and Frame Type

Image Type (0008,0008) and Frame Type (0008,9007) are not included in this Macro but one or the other is always included in the Module or Macro that invokes this Macro, and they are therefore described here.

In addition to the requirements specified in Section C.8.16.1 Image Type and Frame Type, the following additional requirements and Defined Terms are specified.

###### C.8.13.1.1.1.1 Pixel Data Characteristics

Value 1 of Image Type (0008,0008) and Frame Type (0008,9007) is discussed in Section C.8.16.1.1. No additional requirements or Defined Terms.

###### C.8.13.1.1.1.2 Patient Examination Characteristics

Value 2 of Image Type (0008,0008) and Frame Type (0008,9007) is discussed in Section C.8.16.1.2. No additional requirements or Defined Terms.

###### C.8.13.1.1.1.3 Image Flavor

Table C.8-80 specifies the Defined Terms for MR additional to those defined in Section C.8.16.1.3 for Value 3 for Image Type (0008,0008) and Frame Type (0008,9007).

Table C.8-80. MR-Specific Image Type and Frame Type Value 3

Defined Term Name | Defined Term Description
--- | ---
ANGIO_TIME | Angio time acquisition (peripheral vascular/carotid)
ASL | Arterial Spin Labeling
CINE | Cardiac CINE
DIFFUSION | Collected to show diffusion effects.
DIXON | Dixon Water Fat Imaging Techniques.
FLOW_ENCODED | Flow Encoded
FLUID_ATTENUATED | Fluid Attenuated T2 weighted
FMRI | Collected for functional imaging calculations.
MAX_IP | Maximum Intensity Projection
MIN_IP | Minimum Intensity Projection
M_MODE | Image line over time
METABOLITE_MAP | Metabolite Maps from spectroscopy data
MULTIECHO | Multiple echoes with different contrast weighting (e.g., proton density and T2 weighted)
PROTON_DENSITY | Proton density weighted
REALTIME | Real-time collection of single slices
STIR | Short Tau Inversion Recovery
TAGGING | Images with superposition of thin saturation bands
TEMPERATURE | Images record temperature
T1 | T1 weighted
T2 | T2 weighted
T2_STAR | T2* weighted
TOF | Time Of Flight weighted
VELOCITY | Velocity encoded

###### C.8.13.1.1.1.4 Derived Pixel Contrast

Table C.8-81 specifies the Defined Terms for MR additional to those defined in Section C.8.16.1.4 for Value 4 for Image Type (0008,0008) and Frame Type (0008,9007).

Table C.8-81. MR-Specific Image Type and Frame Type Value 4

Defined Term Name | Defined Term Description
--- | ---
ADC | Apparent Diffusion Coefficient
DIFFUSION | Diffusion weighted
DIFFUSION_ANISO | Diffusion Anisotropy
DIFFUSION_ATTNTD | Diffusion Attenuated. Derived by removing the T2 contributions from a Diffusion Weighted image.
DIFFUSION_ISO | Isotropic images derived from Directional Diffusion images
FAT | Fat images derived using Dixon or other techniques
FAT_FRACTION | Fat Fraction images derived using Dixon or other techniques
FIELD_MAP | Field Map images derived using Dixon or other techniques
IN_PHASE | Water/Fat In Phase images derived using Dixon or other techniques
METABOLITE_MAP | Metabolite Maps from spectroscopy data
NEI | Created through Negative Enhancement Integral operation
OUT_OF_PHASE | Water/Fat Out of phase images derived using Dixon or other techniques
PERFUSION_ASL | Perfusion from an ASL series obtained by subtraction of control and label data
R_COEFFICIENT | R-Coefficient Map (fMRI)
R2_MAP | R2 Map
R2_STAR_MAP | R2* Map images derived using Dixon or other techniques
RHO | Proton Density map
SCM | Signal Change Map
SNR_MAP | Signal to Noise Map
T1_MAP | T1 Map
T2_STAR_MAP | T2* Map images derived using Dixon or other techniques
T2_MAP | T2 Map
TCS | Time Course of Signal
TEMPERATURE | Temperature encoded
VELOCITY | Velocity encoded
WATER | Water images derived using Dixon or other techniques
WATER_FRACTION | Water fraction images derived using Dixon or other techniques

###### C.8.13.1.1.2 Photometric Interpretation, Pixel Representation, Samples Per Pixel, Planar Configuration, Bits Allocated and Bits Stored

Table C.8-82 specifies the Enumerated Values and allowed combinations of Samples per Pixel (0028,0002), Planar Configuration (0028,0006), Pixel Representation (0028,0103), Bits Allocated (0028,0100) and Bits Stored (0028,0101) for each allowable Photometric Interpretation allowed by the IOD that invokes this Module.

Table C.8-82. Allowed Combinations of Attribute Values for Photometric Interpretation, Samples Per Pixel, Planar Configuration, Pixel Representation, Bits Allocated and Bits Stored

Photometric Interpretation | Samples per Pixel | Planar Configuration | Pixel Representation | Bits Allocated | Bits Stored
--- | --- | --- | --- | --- | ---
MONOCHROME2 | 1 | - | 0 or 1 | 8 | 8
MONOCHROME2 | 1 | - | 0 or 1 | 16 | 12, 16
RGB | 3 | 0 | 0 | 8 | 8
YBR_ICT | 3 | 0 | 0 | 8 | 8
YBR_RCT | 3 | 0 | 0 | 8 | 8
YBR_PARTIAL_420 | 3 | 0 | 0 | 8 | 8
YBR_FULL_422 | 3 | 0 | 0 | 8 | 8
YBR_FULL | 3 | 1 | 0 | 8 | 8

###### C.8.13.1.1.3 Pixel Presentation

See Section C.8.16.2.1.1. No additional requirements or Defined Terms.

###### C.8.13.1.1.3.1 Supplemental Palette Color LUTs

See Section C.8.16.2.1.1.1.

###### C.8.13.1.1.4 Volumetric Properties

See Section C.8.16.2.1.2. No additional requirements or Defined Terms.

###### C.8.13.1.1.5 Volume Based Calculation Technique

See Section C.8.16.2.1.3. No additional requirements or Defined Terms.

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DICOM PS3.3 2018a - Information Object Definitions