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.8-79ENHANCED MR IMAGE MODULE ATTRIBUTES

Attribute Name Tag Type Attribute Description
Include ' MR Image and Spectroscopy Instance Macro' Table C.8-81
Image Type (0008,0008) 1 Image characteristics. See C.8.16.1 and C.8.13.1.1.1.
Include Common CT/MR Image Description Macro' Table C.8-131
Include 'MR Image Description Macro' Table C.8.82
Samples per Pixel (0028,0002) 1 Number of samples (planes) in this image. For Enumerated Values see 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 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 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 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 C.8.13.1.1.2
Planar Configuration (0028,0006) 1C Indicates whether the pixel data are sent color-by-plane or color-by-pixel. Required if Samples per Pixel (0028,0002) has a value greater than 1. See C.7.6.3.1.3 and C.8.13.1.1.2 for further explanation.
Spacing between Slices (0018,0088) 3 Value of the prescribed spacing to be applied between the slices in a volume that is to be acquired. The spacing in mm is defined as the center-to-center distance of adjacent slices.
Burned In Annotation (0028,0301) 1 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.
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) 1 Specifies whether an Image has undergone lossy compression. Enumerated Values: 00 = Image has NOT been subjected to lossy compression. 01 = Image has been subjected to lossy compression. See C.7.6.1.1.5 for further explanation.
Lossy Image Compression Ratio (0028,2112) 1C Describes the approximate lossy compression ratio(s) that have been applied to this image. See C.7.6.1.1.5 for further explanation. May be multivalued if successive lossy compression steps have been applied. Note: For example, a compression ratio of 30:1 would be described in this Attribute with a single value of 30. Required if Lossy Images 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 C.7.6.1.1.5 for further explanation. May be multivalued if successive lossy compression steps have been applied; the value order shall correspond to the values of Lossy Image Compression Ratio (0028,2112). 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 ‘Image Pixel Macro’ Table C.7-11b See Section F.7.

C.8.13.1.1 Enhanced MR Image Module Attribute Description

C.8.13.1.1.1 Image Type and Frame Type

The 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 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 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 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 C.8.16.1.3 for Value 3 for Image Type (0008,0008) and Frame Type (0008,9007).

Table C.8-80MR-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.
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 C.8.16.1.4 for Value 4 for Image Type (0008,0008) and Frame Type (0008,9007).

Table C.8-81MR-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
METABOLITE_MAP Metabolite Maps from spectroscopy data
NEI Created through Negative Enhancement Integral operation
PERFUSION_ASL Perfusion from an ASL series obtained by subtraction of control and label data
R_COEFFICIENT R-Coefficient Map (fMRI)
RHO Proton Density map
SCM Signal Change Map
SNR_MAP Signal to Noise Map
T1_MAP T1 Map
T2_STAR_MAP T2* Map
T2_MAP T2 Map
TCS Time Course of Signal
TEMPERATURE Temperature encoded
VELOCITY Velocity encoded

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.8-82ALLOWED 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

C.8.13.1.1.3 Pixel Presentation

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

C.8.13.1.1.3.1 Supplemental Palette Color LUTs

See C.8.16.2.1.1.1.

C.8.13.1.1.4 Volumetric Properties

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

C.8.13.1.1.5 Volume Based Calculation Technique

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