C.8.6 Secondary Capture Modules

C.8.6.1 SC Equipment Module

This Module describes equipment used to convert images into a DICOM format.

Table C.8-24SC EQUIPMENT MODULE ATTRIBUTES

Attribute Name Tag Type Attribute Description
Conversion Type (0008,0064) 1 Describes the kind of image conversion. Defined Terms : DV = Digitized Video DI = Digital Interface DF = Digitized Film WSD = Workstation SD = Scanned Document SI = Scanned Image DRW = Drawing SYN = Synthetic Image
Modality (0008,0060) 3 Source equipment for the image. This type definition shall override the definition in the General Series Module. See C.7.3.1.1.1 for Defined Terms.
Secondary Capture Device ID (0018,1010) 3 User defined identification of the device that converted the image
Secondary Capture Device Manufacturer (0018,1016) 3 Manufacturer of the Secondary Capture Device
Secondary Capture Device Manufacturer's Model Name (0018,1018) 3 Manufacturer's model number of the Secondary Capture Device
Secondary Capture Device Software Versions (0018,1019) 3 Manufacturer's designation of software version of the Secondary Capture Device
Video Image Format Acquired (0018,1022) 3 Original format of the captured video image (e.g. NTSC, PAL, Videomed-H)
Digital Image Format Acquired (0018,1023) 3 Additional information about digital interface used to acquire the image

Notes: 1. The Attributes specified in the General equipment Module (see Table C.7-6) describe the equipment which created the image being captured. The Attributes of the SC Equipment Module define the equipment that captured the image. The following table illustrates typical scenarios for different conversion types:

Conversion Type (0008,0064) General Equipment Secondary Capture Equipment
Digitized Video (DV) The equipment generating the video signal. The equipment digitizing the video signal.
Digital Interface (DI) The equipment on the sending side of the digital interface. The equipment on the receiving side of the digital interface.
Digitized Film (DF) The equipment which created the film. The equipment digitizing the film.
Workstation (WSD) Application dependent, but often the equipment which placed the image on the workstation screen, or created the modified image. The equipment which captured the image from the screen, or which placed the modified image into a DICOM SOP Instance.
Scanned Document (SD) The equipment which created the document. The equipment digitizing the document.
Scanned Image (SI) The equipment which created the image that was digitized. The equipment digitizing the image.
Drawing (DRW) The equipment which created the drawing. The equipment digitizing (or rasterizing) the drawing.
Synthetic Image (SYN) The equipment creating the original images from which the synthetic image was derived. The equipment creating the synthetic image.

2. The Attribute Modality (0008,0060) specified in the General Series Module (see Table C.7-4) has been specialized by this Module and is defined as a Type 3 Attribute.

C.8.6.2 SC Image Module

Table C.8-25 contains IOD Attributes that describe Secondary Capture Images.

Table C.8-25SC IMAGE MODULE ATTRIBUTES

Attribute Name Tag Type Attribute Description
Date of Secondary Capture (0018,1012) 3 The date the Secondary Capture Image was captured.
Time of Secondary Capture (0018,1014) 3 The time the Secondary Capture Image was captured.
Nominal Scanned Pixel Spacing (0018,2010) 3 Physical distance on the media being digitized or scanned between the center of each pixel, specified by a numeric pair - adjacent row spacing (delimiter) adjacent column spacing in mm. See 10.7.1.3 for further explanation of the value order. Shall be consistent with Pixel Aspect Ratio (0028,0034), if present.
Document Class Code Sequence (0040,E008) 3 Classifications of a scanned document, e.g., for Modality (0008,0060) DOC. Equivalent to HL7 v2.x TXA-2. One or more items are permitted in this sequence.
>Include ‘Code Sequence Macro’ Table 8.8-1 No Baseline Context Group
Include Basic Pixel Spacing Calibration Macro (Table 10-10)

Note: The Attributes specified in the General Image Module (see Table C.7-7) describe this image (ie. the secondary capture image). For example, Instance Number (0020,0013) is the image number of the secondary capture image. Source Image Sequence (0008,2112) may reference the DICOM image from which this image was generated.

C.8.6.3 SC Multi-frame Image Module

Table C.8-25b contains IOD Attributes that describe SC Multi-frame images.

Table C.8-25bSC MULTI-FRAME IMAGE MODULE ATTRIBUTES

Attribute Name Tag Type Attribute Description
Burned In Annotation (0028,0301) 1 Indicates whether or not image contains sufficient burned in annotation to identify the patient and date the image was acquired. Enumerated Values: YES NO
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.
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, and BitsStored (0028,0101) is greater than 1. Note: If the VOI LUT Module is required by the IOD but no VOI LUT Sequence (0028,3010) or Window Center (0028,1050) is present, then the VOI LUT stage is an identity transformation.
Illumination (2010,015E) 3 Luminance of a hypothetical viewing device illuminating a piece of monochrome transmissive film, or for the case of reflective media, luminance obtainable from diffuse reflection of the illumination present. Expressed as L0, in candelas per square meter (cd/m2). Note: May be used together with Reflected Ambient Light (2010,0160) to recover Optical Density information from P-Values. See C.8.6.3.1.
Reflected Ambient Light (2010,0160) 3 For scanned monochrome transmissive film viewed on a hypothetical viewing device, the luminance contribution due to reflected ambient light. Expressed as La, in candelas per square meter (cd/m2). Note: May be used together with Illumination (2010,015E) to recover Optical Density information from P-Values. See C.8.6.3.1.
Rescale Intercept (0028,1052) 1C The value b in the relationship between stored values (SV) in Pixel Data (7FE0,0010) and the output units specified in Rescale Type (0028,1054). Output units = m*SV + b. Enumerated Value: 0 Required if Photometric Interpretation (0028,0004) is MONOCHROME2, and BitsStored (0028,0101) is greater than 1. Note: This specifies an identity Modality LUT transformation.
Rescale Slope (0028,1053) 1C m in the equation specified by Rescale Intercept (0028,1052). Enumerated Value: 1 Required if Photometric Interpretation (0028,0004) is MONOCHROME2, and BitsStored (0028,0101) is greater than 1. Note: This specifies an identity Modality LUT transformation.
Rescale Type (0028,1054) 1C Specifies the output units of Rescale Slope (0028,1053) and Rescale Intercept (0028,1052). Enumerated Value: US = Unspecified Required if Photometric Interpretation (0028,0004) is MONOCHROME2, and BitsStored (0028,0101) is greater than 1. Note: This specifies an identity Modality LUT transformation.
Frame Increment Pointer (0028,0009) 1C Contains the Data Element Tag of the attribute which is used as the frame increment in Multi-frame pixel data. See C.7.6.6.1.2 for further explanation. Shall be present if Number of Frames is greater than 1, overriding (specializing) the Type 1 requirement on this attribute in the Multi-frame Module.
Nominal Scanned Pixel Spacing (0018,2010) 1C Physical distance on the media being digitized or scanned between the center of each pixel, specified by a numeric pair - adjacent row spacing (delimiter) adjacent column spacing in mm. See 10.7.1.3 for further explanation of the value order. Required if Conversion Type (0008,0064) is DF (Digitized Film). May also be present if Conversion Type (0008,0064) is SD (Scanned Document) or SI (Scanned Image). Shall be consistent with Pixel Aspect Ratio(0028,0034), if present.
Include Basic Pixel Spacing Calibration Macro (Table 10-10)
Digitizing Device Transport Direction (0018,2020) 3 Enumerated Values: ROW COLUMN
Rotation of Scanned Film (0018,2030) 3 Angle of the edge of the film relative to the transport direction in degrees greater than or equal to -45 and less than or equal to +45.

C.8.6.3.1 Scanned Film, Optical Density and P-Values

Illumination (2010,015E) and Reflected Ambient Light (2010,0160) may be used to recover Optical Density information from P-Values.

Monochrome media that is being digitized is often measured in Optical Density values. These values need to be converted to P-Values for storage and display. The P-Values used in an image correspond to the perception of a human observer viewing the film on a hypothetical viewing device (such as a light box), using the specified values of Illumination (2010,015E) and Reflected Ambient Light (2010,0160).

The Grayscale Standard Display Function defined in PS 3.14 is used to convert Luminance to P-Values. In the case of scanned film, the Luminance is derived from Optical Density using the specified values of Illumination (2010,015E) and Reflected Ambient Light (2010,0160). An example of this derivation, as well as typical “default” values for these parameters, is specified in PS 3.14.

C.8.6.4 SC Multi-frame Vector Module

Table C.8-25c contains IOD Attributes that may be the target of the Frame Increment Pointer (0028,0009) for SC Multi-frame images.

Table C.8-25cSC MULTI-FRAME VECTOR MODULE ATTRIBUTES

Attribute Name Tag Type Attribute Description
Frame Time Vector (0018,1065) 1C An array which contains the real time increments (in msec) between frames for a Multi-frame image. See C.7.6.5.1.2 for further explanation. Required if Frame Increment Pointer (0028,0009) points to Frame Time Vector (0018,1065). Note: Frame Time Vector arrays may not be properly encoded if Explicit-VR transfer syntax is used and the VL of this attribute exceeds 65534 bytes.
Page Number Vector (0018,2001) 1C An array which contains, for each of the image frames, the corresponding page numbers of the original document. Required if Frame Increment Pointer (0028,0009) points to Page Number Vector (0018,2001).
Frame Label Vector (0018,2002) 1C An array which contains, for each of the image frames, a descriptive label. Required if Frame Increment Pointer (0028,0009) points to Frame Label Vector (0018,2002).
Frame Primary Angle Vector (0018,2003) 1C An array which contains, for each of the image frames, the primary angle of rotation about an undefined axis, in degrees. May be used for annotative purposes for “cine loops” of 3D reprojected images Required if Frame Increment Pointer (0028,0009) points to Frame Primary Angle Vector (0018,2003).
Frame Secondary Angle Vector (0018,2004) 1C An array which contains, for each of the image frames, the secondary angle of rotation about an undefined axis that is orthogonal to that used for Frame Primary Angle Vector (0018,2003), in degrees. May be used for annotative purposes for “cine loops” of 3D reprojected images Required if Frame Increment Pointer (0028,0009) points to Frame Secondary Angle Vector (0018,2004).
Slice Location Vector (0018,2005) 1C An array that contains, for each of the image frames, the relative position of the image plane expressed in mm, as defined for Slice Location (0020,1041). See C.7.6.2.1.2 for further explanation. Required if Frame Increment Pointer (0028,0009) points to Slice Location Vector (0018,2005).
Display Window Label Vector (0018,2006) 1C An array which contains, for each of the image frames, a label or number of the display window of a graphical user interface from which the frame was captured. Required if Frame Increment Pointer (0028,0009) points to Display Window Label Vector (0018,2006).