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 sent 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.

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)

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 for further explanation.

May be multi-valued if successive lossy compression steps have been applied; the value order shall correspond to the values of Lossy Image Compression Method (0028,2114).

Note

  1. For example, a compression ratio of 30:1 would be described in this Attribute with a single value of 30.

  2. For historical reasons, the lossy compression ratio may also be described in Derivation Description (0008,2111).

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 for further explanation.

May be multi-valued if successive lossy compression steps have been applied; the value order shall correspond to the values of Lossy Image Compression Ratio (0028,2112).

Note

For historical reasons, the lossy compression method may also be described in Derivation Description (0008,2111).

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 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

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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