C.8.1 Computed Radiography Modules

This Section describes Computed Radiography Series and Image Modules. These Modules contain Attributes that are specific to Computed Radiography images. There is no Computed Radiography Equipment Module.

C.8.1.1 CR Series Module

Table C.8-1 contains IOD Attributes that describe a computed radiography series performed on the patient.

Table C.8-1CR SERIES MODULE ATTRIBUTES

Attribute Name Tag Type Attribute Description
Body Part Examined (0018,0015) 2 Text description of the part of the body examined. See PS 3.16 Annexes on Correspondence of Anatomic Region Codes and Body Part Examined for Humans and for Animals for Defined Terms
View Position (0018,5101) 2 Radiographic view associated with Patient Position (0018,5100). Defined Terms for humans: AP = Anterior/Posterior PA = Posterior/Anterior LL = Left Lateral RL = Right Lateral RLD = Right Lateral Decubitus LLD = Left Lateral Decubitus RLO = Right Lateral Oblique LLO = Left Lateral Oblique For animals, capitalized versions with hypens replaced by underscores of the abbreviations defined in “Smallwood et al. A Nomenclature For Radiographic Projections Used In Veterinary Medicine” shall be used. See PS 3.16 CID 7484 DX View for Animals, in which these abbreviations are listed. Notes: 1. For example, the Defined Term “CD10DI_CRPRO” would be used for a “Cd10Di-CrPrO” or “caudal 10-degree distal-cranioproximal oblique”. 2. The Code String value representation for this attribute constrains the characters to uppercase, digits and underscore.
Filter Type (0018,1160) 3 Label for the type of filter inserted into the x-ray beam
Collimator/grid Name (0018,1180) 3 Label describing any grid inserted.
Focal Spot (0018,1190) 3 Size of the focal spot in mm. For devices with variable focal spot or multiple focal spots, small dimension followed by large dimension.
Plate Type (0018,1260) 3 Label of the type of storage phosphor plates used in this series
Phosphor Type (0018,1261) 3 Label of type of phosphor on the plates

C.8.1.2 CR Image Module

Table C.8-2 contains IOD Attributes that describe computed radiography images.

Table C.8-2CR IMAGE MODULE ATTRIBUTES

Attribute Name Tag Type Attribute Description
Photometric Interpretation (0028,0004) 1 Specifies the intended interpretation of the pixel data. Shall have one of the following Enumerated Values: MONOCHROME1 MONOCHROME2
KVP (0018,0060) 3 Peak kilo voltage output of the x-ray generator used
Plate ID (0018,1004) 3 The ID or serial number of the sensing plate upon which the image was acquired
Distance Source to Detector (0018,1110) 3 Distance in mm from source to detector center. Note: This value is traditionally referred to as Source Image Receptor Distance (SID).
Distance Source to Patient (0018,1111) 3 Distance in mm from source to isocenter (center of field of view) . Note: This value is traditionally referred to as Source Object Distance (SOD).
Exposure Time (0018,1150) 3 Time of x-ray exposure in msec
X-Ray Tube Current (0018,1151) 3 X-Ray Tube Current in mA.
Exposure (0018,1152) 3 The exposure expressed in mAs, for example calculated from Exposure Time and X-Ray Tube Current.
Exposure in µAs (0018,1153) 3 The exposure expressed in µAs, for example calculated from Exposure Time and X-Ray Tube Current.
Imager Pixel Spacing (0018,1164) 3 Physical distance measured at the front plane of the Image Receptor housing between the center of each pixel. Specified by a numeric pair - row spacing value (delimiter) column spacing value - in mm. In the case of CR, the front plane is defined to be the external surface of the CR plate closest to the patient and radiation source.
Include Basic Pixel Spacing Calibration Macro (Table 10-10)
Generator Power (0018,1170) 3 Power in kW to the x-ray generator.
Acquisition Device Processing Description (0018,1400) 3 Describes device-specific processing associated with the image (e.g. Organ Description)
Acquisition Device Processing Code (0018,1401) 3 Code representing the device-specific processing associated with the image (e.g. CR Organ Filtering code)
Cassette Orientation (0018,1402) 3 Orientation of cassette, used to properly position the image for display. Enumerated Values: LANDSCAPE PORTRAIT
Cassette Size (0018,1403) 3 Size of cassette. Defined Terms: 18CMX24CM 8INX10IN 24CMX30CM 10INX12IN 30CMX35CM 30CMX40CM 11INX14IN 35CMX35CM 14INX14IN 35CMX43CM 14INX17IN
Exposures on Plate (0018,1404) 3 Total number of x-ray exposures that have been made on the plate identified in Plate ID (0018,1004)
Relative X-Ray Exposure (0018,1405) 3 Relative x-ray exposure on the plate. Meaning of values is implementation specific. May be used to adjust the dynamic range of the plate digitizer (scanner). Note: This value is manufacturer-specific. DICOM specifies standard Attributes in Table 10-23 ‘Exposure Index Macro’ which are recommended.
Sensitivity (0018,6000) 3 Read out sensitivity. Note: This value is manufacturer-specific. DICOM specifies standard Attributes in Table 10-23 ‘Exposure Index Macro’ which are recommended.
Include 'General Anatomy Optional Macro' Table 10-7 Defined Context ID for the Anatomic Region Sequence is 4009 for humans, and 7482 for animals.
Include Table 10-23 ‘Exposure Index Macro’