Image Type Attribute
| Tag | (0008,0008) |
|---|---|
| Type | Required (1) |
| Keyword | ImageType |
| Value Multiplicity | 2-n |
| Value Representation | Code String (CS) |
| Example Values |
|
Image characteristics. See Section C.8.16.1 and Section C.8.13.1.1.1.
Section C.8.16.1
C.8.16.1 Image Type and Frame Type
Image Type (0008,0008) and associated Attributes provide a high level description of a multi-frame SOP Instance. Image Type (0008,0008) contains the highest level summary of what is in the SOP Instance.
Frame Type (0008,9007) mirrors the corresponding Image Type Attribute and applies to the frame level.
If more than one value is used by the set of frames for a given Frame Type (0008,9007) Attribute value or associated Attribute value then the corresponding value of Image Type (0008,0008) or associated Attribute shall contain a value of MIXED. This indicates that a mixed set of values exists within the multi-frame SOP Instance.
The value MIXED shall only be used in Image Type (0008,0008) when the corresponding values for the individual frames are not equal. When a value of an Attribute is equal for all frames, the same value shall be used for the corresponding value of Image Type (0008,0008). Values 2 and 3 of Image Type (0008,0008) are an exception to the rule for MIXED: Values 2 and 3 may never have the value of MIXED as described in Section C.8.16.1.2 and Section C.8.16.1.3.
Image Type (0008,0008) and Frame Type (0008,9007) shall consist of four values, except that a fifth value shall be present if Multi-energy CT Acquisition (0018,9361) has a value of YES.
C.8.16.1.1 Pixel Data Characteristics
Value 1 of Image Type (0008,0008) and Frame Type (0008,9007) shall use one of the following Enumerated Values from Table C.8-127.
Value 1 of Image Type (0008,0008) and Value 1 of Frame Type (0008,9007) shall not be zero length.
Table C.8-127. Image Type and Frame Type Value 1
|
Enumerated Value Name |
Enumerated Value Description |
|---|---|
|
ORIGINAL |
An image or frame is original if its pixel data was directly reconstructed from the original data that is obtained from the sensors of the imaging equipment, Image Type (0008,0008) Value 4 is NONE, and Volume Based Calculation Technique (0008,9207) is NONE. Note
|
|
DERIVED |
An image or frame is derived if its pixel data was calculated from original or other derived pixel data (i.e., it is not original). |
|
MIXED |
Used only as a value in Image Type (0008,0008) if frames within the SOP Instance contain different values for Value 1 in their Frame Type (0008,9007). |
C.8.16.1.2 Patient Examination Characteristics
Value 2 for Image Type (0008,0008) and Frame Type (0008,9007) follows the standard definition and shall have the following Enumerated Value from Table C.8-128.
Value 2 of Image Type (0008,0008) and Value 2 of Frame Type (0008,9007) shall not be zero length.
Table C.8-128. Image Type and Frame Type Value 2
|
Enumerated Value Name |
Enumerated Value Description |
|---|---|
|
PRIMARY |
C.8.16.1.3 Image Flavor
Value 3 is an overall representation of the image type. This value may be a summary of several other Attributes or a duplication of one of the other Attributes to indicate the most important aspect of this image. Value 3 Image Flavor is to be used with Value 4 Derived Pixel Contrast to indicate the nature of the image set.
Note
For example Value 3 = DIFFUSION together with Value 4 = NONE indicates that the image set was originally collected for DIFFUSION.
If Value 3 = DIFFUSION together with Value 4 = DIFFUSION this indicates that the object contains DIFFUSION weighted post processed images.
Value 3 of Image Type (0008,0008) shall not be zero length.
Value 3 of Frame Type (0008,9007) may have the same value as found in Value 3 of Image Type (0008,0008), or may have a different value.
The Attribute value may not be MIXED as this value needs to be a summary of the primary purpose of the images, whether the frames have the same value or not.
Table C.8-129 specifies the Defined Terms for Value 3 for Image Type (0008,0008) and Frame Type (0008,9007) that are common to CT and MR. Additional Defined Terms are defined in the modality-specific Module and Macro definitions.
Table C.8-129. Image Type and Frame Type Value 3 Common
|
Defined Term Name |
Defined Term Description |
|---|---|
|
ANGIO |
Collected for the purpose of angiography. |
|
CARDIAC |
Images of the heart. |
|
CARDIAC_GATED |
Cardiac gated images, other than of the heart. |
|
CARDRESP_GATED |
Cardiac and respiratory gated images. |
|
DYNAMIC |
An image in which the same anatomical volume is imaged at multiple times in order to capture images of a non-cyclic, time varying event. For example, imaging of the uptake of a tracer or contrast in a specific organ over time. NoteThis is different from gating techniques, in which the same anatomical volume is imaged during some portion of a cyclic event, e.g., inspiration or R-R Interval. |
|
FLUOROSCOPY |
Real-time collection of single slices (e.g., CT or MR Fluoroscopy). |
|
LOCALIZER |
Collected for the purpose of planning other images. |
|
MOTION |
Collected for looking at body motion. |
|
PERFUSION |
Collected for the purposes of perfusion calculations. |
|
PRE_CONTRAST |
Collected before contrast was administered. |
|
POST_CONTRAST |
Collected during or after contrast was administered. |
|
RESP_GATED |
Respiratory gated images. |
|
REST |
Cardiac rest image set. |
|
STATIC |
A group of frames at varying spatial locations acquired at the same time. |
|
STRESS |
Cardiac stress image set. |
|
VOLUME |
Set of frames that define a regularly sampled volume. |
|
NON_PARALLEL |
Set of frames that are not parallel. |
|
PARALLEL |
Set of frames that are parallel but do not constitute a regularly sampled volume. |
|
WHOLE_BODY |
A group of frames of the whole body; the frames may be acquired at various times (as distinct from STATIC). |
C.8.16.1.4 Derived Pixel Contrast
Value 4 shall be used to indicate derived pixel contrast - generally, contrast created by combining or processing images with the same geometry. Value 4 shall have a value of NONE when Value 1 is ORIGINAL.
Value 4 may have the value QUANTITY if the derived pixel contrast is described in the Quantity Definition Sequence (0040,9220) of the Real World Value Mapping Macro.
Note
If more than one of the following derived types is applicable, then it is up to the generating application to specify the value that best characterizes the derived image.
Value 4 of Image Type (0008,0008) and Value 4 of Frame Type (0008,9007) shall not be zero length unless the SOP Class UID is "1.2.840.10008.5.1.4.1.1.2.2" or "1.2.840.10008.5.1.4.1.1.4.4" or "1.2.840.10008.5.1.4.1.1.128.1" (Legacy Converted).
Table C.8-130 specifies the Defined Terms for Value 4 for Image Type (0008,0008) and Frame Type (0008,9007) that are common to CT and MR. Additional Defined Terms are defined in the modality-specific Module and Macro definitions.
Table C.8-130. Image Type and Frame Type Value 4 Common
|
Defined Term Name |
Defined Term Description |
|---|---|
|
ADDITION |
Created through Pixel by pixel addition operation. |
|
DIVISION |
Created through Pixel by pixel division operation. |
|
MASKED |
Created through Pixel by pixel masking operation. |
|
MAXIMUM |
Created through Pixel by Pixel maximum operation. |
|
MEAN |
Created through Pixel by pixel mean operation. |
|
MINIMUM |
Created through Pixel by Pixel minimum operation. |
|
MULTIPLICATION |
Created through Pixel by pixel multiplication operation. |
|
RESAMPLED |
Pixels have been spatially re-sampled, e.g., MPR. |
|
STD_DEVIATION |
Standard Deviation. |
|
SUBTRACTION |
Created through Pixel by pixel subtraction operation. |
|
NONE |
Not a calculated image. |
|
QUANTITY |
Derived pixel values are a quantity described by Quantity Definition Sequence (0040,9220) of the Real World Value Mapping Macro. |
|
MIXED |
Used only as value in Image Type (0008,0008) if frames within the image SOP Instance contain different values for value 4 in their Frame Type (0008,9007) Attribute. |
Section C.8.13.1.1.1
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 |
|---|---|
|
|
|
Note
This table formerly contained defined terms such as ADC, etc. These have been replaced with the use of QUANTITY and the appropriate coded entry used in Quantity Definition Sequence (0040,9220) of the Real World Value Mapping Macro. For former defined terms, see PS3.3-2018c.