DICOM PS3.3 2020b - Information Object Definitions

C.8.4.9 NM Image Module (Current)
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#### C.8.4.9 NM Image Module

Table C.8-9 contains the Attributes that describe Nuclear Medicine Images.

Table C.8-9. NM Image Module Attributes

Attribute Name | Tag | Type | Attribute Description
--- | --- | --- | ---
Image Type | (0008,0008) | 1 | Image identification characteristics. See Section C.8.4.9.1.1 for specialization.
Image ID | (0054,0400) | 3 | User or equipment generated Image identifier.
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 Lossy Compression has been performed on the Image. May be present otherwise.
Counts Accumulated | (0018,0070) | 2 | Sum of all gamma events for all frames in the image. See Section C.8.4.9.1.2 for specialization.
Acquisition Termination Condition | (0018,0071) | 3 | Description of how the data collection was stopped. Defined Terms: CNTS counts DENS density MANU manual OVFL data overflow TIME time TRIG physiological trigger See Section C.8.4.9.1.3 for specialization.
Table Height | (0018,1130) | 3 | The height of the patient table in mm. The range and values of this element are determined by the manufacturer. Should not be included if Image Type (0008,0008), Value 3, is TOMO, GATED TOMO, RECON TOMO or RECON GATED TOMO.
Table Traverse | (0018,1131) | 3 | Location of the patient table (or gantry relative to the table) in mm. The range and values of this element are determined by the manufacturer. Should not be included if Image Type (0008,0008), Value 3, is TOMO, GATED TOMO, RECON TOMO or RECON GATED TOMO.
Actual Frame Duration | (0018,1242) | 1C | Elapsed time for data acquisition in msec. Required if Image Type (0008,0008) Value 3 is: WHOLE BODY or STATIC. See Section C.8.4.9.1.4 for specialization.
Count Rate | (0018,1243) | 3 | Maximum count rate achieved during the acquisition in counts/sec.
Processing Function | (0018,5020) | 3 | Code or description of processing functions applied to the data.
Corrected Image | (0028,0051) | 3 | One or more values that indicate which, if any, corrections have been applied to the image. Corrections are applied to all frames in the image. Defined Terms: UNIF flood corrected COR center of rotation corrected NCO non-circular orbit corrected DECY decay corrected ATTN attenuation corrected SCAT scatter corrected DTIM dead time corrected NRGY energy corrected LIN linearity corrected MOTN motion corrected CLN count loss normalization; Any type of normalization applied to correct for count loss in Time Slots.
Whole Body Technique | (0018,1301) | 3 | The type of scan performed. Used only if Image Type (0008,0008), Value 3, contains the value WHOLE BODY. Enumerated Values: 1PS one pass 2PS two pass PCN patient contour following employed MSP multiple static frames collected into a whole body frame
Scan Velocity | (0018,1300) | 2C | The speed of the camera motion over the body in mm/sec. Required if Image Type (0008,0008) Value 3 contains the value WHOLE BODY.
Scan Length | (0018,1302) | 2C | Size of the imaged area in the direction of scanning motion, in mm. Required if Image Type (0008,0008) Value 3 contains the value WHOLE BODY.
Trigger Source or Type | (0018,1061) | 3 | Text indicating trigger source. Defined Terms: EKG
Include Table 10-7 “General Anatomy Optional Macro Attributes” | No CID for the Anatomic Region Sequence is defined.
Real World Value Mapping Sequence | (0040,9096) | 3 | The mapping of stored values to associated real world values. One or more Items are permitted in this Sequence.
>Include Table C.7.6.16-12b “Real World Value Mapping Item Macro Attributes” | Defined CID for Measurement Units Code Sequence is CID 84 “PET Units”.
Scan Progression Direction | (0054,0501) | 3 | The anatomical order in which the slices were acquired. Enumerated Values: FEET_TO_HEAD Slices closest to the patient's feet were acquired first. HEAD_TO_FEET Slices closest to the patient's head were acquired first.

### Note

1. Content Date (0008,0023) and Content Time (0008,0033) are included in the General Image Module, Table C.7-7, whenever the images are temporally related. For this purpose, all NM Images are considered temporally related, so that these elements are included in an NM Image.

2. Referenced Overlay Sequence (0008,1130) and Referenced Curve Sequence (0008,1145) were previously included in this Module as optional Attributes but have been retired. See PS3.3-2004. Referenced Image Real World Value Mapping Sequence (0040,9094) was previously used in this Module to enclose the Real World Value Mapping Sequence (0040,9096) but has been retired. See PS3.3-2011.

##### C.8.4.9.1 NM Image Module Attribute Descriptions

###### C.8.4.9.1.1 Image Type

For NM images, Image Type (0008,0008) Value 3 is specified to be Type 1.

Enumerated Values for Value 3:

STATIC

DYNAMIC

GATED

WHOLE BODY

TOMO

GATED TOMO

RECON TOMO

RECON GATED TOMO

Enumerated Values for Value 4:

EMISSION

TRANSMISSION

### Note

For NM images, Image Type (0008,0008) Value 1 will be ORIGINAL for all raw data and reconstructed images. DERIVED may be appropriate for some other results images.

For NM images, Image Type (0008,0008) Value 2 will be PRIMARY.

###### C.8.4.9.1.2 Counts Accumulated

Counts Accumulated (0018,0070) is the total of all gamma events accumulated in all frames of this Image. This Attribute applies to acquisition data, and often does not apply to processed images (DERIVED, SECONDARY).

###### C.8.4.9.1.3 Acquisition Termination Condition

Acquisition Termination Condition (0018,0071) is the method of acquisition termination that was actually applied to the data collection.

Defined Terms:

CNTS

  preset count limit was reached

DENS

  preset count density was reached

MANU

  acquisition was terminated manually

OVFL

  acquisition was terminated automatically by pixel data overflow condition

TIME

  preset time limit was reached

TRIG

  preset number of physiological triggers was reached

###### C.8.4.9.1.4 Actual Frame Duration

Actual Frame Duration (0018,1242) is defined as the elapsed time in msec for a single frame of an acquisition. For some types of multi-frame images, Actual Frame Duration (0018,1242) may have a more specialized meaning as defined in the appropriate IOD Module.

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DICOM PS3.3 2020b - Information Object Definitions