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PatientMModule - Patient
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General SeriesMModule - Series
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Clinical Trial SeriesUModule - Series
Frame of ReferenceMModule - Frame of Reference
General EquipmentMModule - Equipment
Enhanced General EquipmentMModule - Equipment
General AcquisitionMModule - Acquisition
Multi-Resolution PyramidUModule - Multi-Resolution Pyramid
General ImageMModule - Image
(0008,0008) Image Type3Code String
(0008,0023) Content Date2CDate
(0008,0033) Content Time2CTime
(0008,2218) Anatomic Region Sequence3Sequence
(0008,2228) Primary Anatomic Structure Sequence3Sequence
(0020,0013) Instance Number2Integer String
(0020,0020) Patient Orientation2CCode String
(0020,0062) Image Laterality3Code String
(0020,4000) Image Comments3Long Text
(0028,0300) Quality Control Image3Code String
(0028,0301) Burned In Annotation3Code String
(0028,0302) Recognizable Visual Features3Code String
(0028,2110) Lossy Image Compression3Code String
(0028,2112) Lossy Image Compression Ratio3Decimal String
(0028,2114) Lossy Image Compression Method3Code String
(0040,9096) Real World Value Mapping Sequence3Sequence
(0028,3003) LUT Explanation1Long String
(0040,08EA) Measurement Units Code Sequence1Sequence
(0040,9210) LUT Label1Short String
(0040,9211) Real World Value Last Value Mapped1CUS or SS
(0040,9212) Real World Value LUT Data1CDouble
(0040,9213) Double Float Real World Value Last Value Mapped1CDouble
(0040,9214) Double Float Real World Value First Value Mapped1CDouble
(0040,9216) Real World Value First Value Mapped1CUS or SS
(0040,9220) Quantity Definition Sequence3Sequence
(0040,9224) Real World Value Intercept1CDouble
(0040,9225) Real World Value Slope1CDouble
(0088,0200) Icon Image Sequence3Sequence
(2050,0020) Presentation LUT Shape3Code String
General ReferenceUModule - Image
Microscope Slide Layer Tile OrganizationMModule - Image
Image PixelMModule - Image
Acquisition ContextMModule - Image
Multi-frame Functional GroupsMModule - Image
Multi-frame DimensionMModule - Image
SpecimenMModule - Image
Whole Slide Microscopy ImageMModule - Image
Optical PathMModule - Image
Slide LabelCModule - Image
SOP CommonMModule - Image
Common Instance ReferenceMModule - Image
Frame ExtractionCModule - Image
Real-Time Video Endoscopic ImageCIOD
Real-Time Video Photographic ImageCIOD
Dermoscopic Photography ImageCIOD
Grayscale Softcopy Presentation StateCIOD
Color Softcopy Presentation StateCIOD
Pseudo-Color Softcopy Presentation StateCIOD
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Basic Structured DisplayCIOD
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Basic Voice Audio WaveformCIOD
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Real World Value MappingCIOD
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Surface SegmentationCIOD
Color PaletteCIOD
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Lensometry MeasurementsCIOD
Autorefraction MeasurementsCIOD
Keratometry MeasurementsCIOD
Subjective Refraction MeasurementsCIOD
Visual Acuity MeasurementsCIOD
Ophthalmic Axial MeasurementsCIOD
Intraocular Lens CalculationsCIOD
Generic Implant TemplateCIOD
Implant Assembly TemplateCIOD
Implant Template GroupCIOD
RT Beams Delivery InstructionCIOD
Ophthalmic Visual Field Static Perimetry MeasurementsCIOD
Intravascular Optical Coherence Tomography ImageCIOD
Ophthalmic Thickness MapCIOD
Surface Scan MeshCIOD
Surface Scan Point CloudCIOD
Legacy Converted Enhanced CT ImageCIOD
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Corneal Topography MapCIOD
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Wide Field Ophthalmic Photography Stereographic Projection ImageCIOD
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Tractography ResultsCIOD
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CT Performed Procedure ProtocolCIOD
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Built with by Innolitics, a team of medical imaging software developers.

Data synced with official DICOM standard on 18 April 2024. The DICOM Standard is under continuous maintenance, and the current official version is available at http://www.dicomstandard.org/current/. 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.

Real World Value Slope Attribute

Tag(0040,9225)
TypeConditionally Required (1C)
KeywordRealWorldValueSlope
Value Multiplicity1
Value RepresentationDouble (FD)

The Slope value in relationship between stored values (SV) and the Real World Values.

See Section C.7.6.16.2.11.1.2 for further explanation.

Required if Float Pixel Data (7FE0,0008) or Double Float Pixel Data (7FE0,0009) are present or Real World Value LUT Data (0040,9212) is not present.

Section C.7.6.16.2.11.1.2

C.7.6.16.2.11.1.2 Real World Value Mapping Sequence Attributes

The Real World Value First Value Mapped (0040,9216) and Real World Value Last Value Mapped (0040,9211) Attributes describe the range of stored pixel values that are mapped by the Sequence Item. Stored pixel values less than the first value mapped, or greater than the last value mapped have no real value attached.

When the Real World Value Intercept (0040,9224) and Real World Value Slope (0040,9225) Attributes are supplied, the stored value (SV) is converted to a Real World Value (RV) using the equation:

RV = (Real World Value Slope) * SV + Real World Value Intercept

When the Real World Value LUT Data (0040,9212) Attribute is supplied, Real World Values are obtained via a lookup operation. The stored pixel value of the first value mapped is mapped to the first entry in the LUT Data. Subsequent stored pixel values are mapped to the subsequent entries in the LUT Data up to a stored pixel value equal to the last value mapped.

The number of entries in the LUT data is given by:

Number of entries = Real World Value Last Value Mapped- Real World Value First Value Mapped + 1

Note

If the stored pixel values that are encoded as floating point rather than integer values, only the equation and not the lookup operation is defined.

The Value Representation of Real World Value First Value Mapped (0040,9216) and Real World Value Last Value Mapped (0040,9211) (US or SS) is determined by the value of Pixel Representation (0028,0103) in the case of integer pixel data, or is SS in the case of floating point pixel data if these Attributes are present.

Note

In practice, integer values may well be sufficient to define an input range that exceeds the actual stored floating point pixel value range. The reason to permit floating point alternatives to an integer range is that sometimes the stored floating point values may be very large and exceed what can be specified as an integer value.

The physical units for the Real World Values obtained from the Sequence Item are given by the Measurement Units Code Sequence (0040,08EA).

The quantity that the Real World Values represent may be described by the Quantity Definition Sequence (0040,9220), which consists of a list of name-value pairs, in which the coded concept name specifies what aspect of the physical quantity is being described.

Note

  1. For example, Relative Regional Blood Flow may be described by units and quantity as follows:

    Additional information about how the relative blood flow was derived, e.g., the reference region used, can also be encoded as name-value pairs in the Quantity Definition Sequence (0040,9220). See the example in Annex EEEE “Encoding Diffusion Model Parameters for Parametric Maps and ROI Measurements (Informative)” in PS3.17.

  2. For example, the Apparent Diffusion Coefficient (ADC) may be described by units and quantity as follows:

    Additional information about how the ADC was derived, e.g., the model used, method of fitting and acquisition b-values used, can also be encoded as name-value pairs in the Quantity Definition Sequence (0040,9220). Other diffusion models and quantities are also defined. See the example in Annex EEEE “Encoding Diffusion Model Parameters for Parametric Maps and ROI Measurements (Informative)” in PS3.17.

The Quantity Definition Sequence (0040,9220) describes only the stored pixel values that are mapped using the Real World Values Mapping, and does not describe derived values from multiple pixels to which the Real World Values Mapping applies.

Note

I.e., the mapping is a "point" operation, and as a consequence various modifiers that might be applied to a group of pixels, such as in an ROI, should not be used. E.g., an ROI encoded in a Structured Report using TID 1419 "ROI Measurements" might be the mean or maximum value (e.g., SUVbw mean or SUVbw max), and be encoded with (121401, DCM, "Derivation") = (373098007, SCT, "Mean") or (56851009, SCT, "Maximum"), respectively. These would not be appropriate to use within Quantity Definition Sequence (0040,9220), unless the individual pixel values were themselves derived in such a manner, e.g., when multiple images are averaged together. Thus the Content Items used in an SR to describe an ROI might be a superset of the name-value pairs used in Quantity Definition Sequence (0040,9220).

Figure C.7.6.16-7. Example of Mapping Stored Values to Real World Values