9. Digital Mammography X-ray Image Information Overview
9.1 Digital Mammography X-ray Image Information IOD Module Table
9.2.5 DX Module
Attribute Name Tag Type DICOM Definition Implementation on CR Console Modality (0008,0060) 1 Type of equipment that originally acquired
the data used to create the image in this series.
(0008,1111) 1C Uniquely identifies the Study Component SOP Instance or Modality Performed Procedure step SOP Instance to which the series is related. The Sequence shall have one item.
Required if Study Component SOP Class or Modality Performed Procedure Step SOP Class is supported.
>Referenced SOP Class UID
(0008,1150) 1C Uniquely identifies the referenced SOP Class.
Required if Referenced Study Component Sequence (0008,1111) is sent.
>Referenced SOP Instance UID
(0008,1155) 1C Uniquely identifies the referenced SOP Instance.
Required if Referenced Study Component Sequence (0008,1111) is sent.
Presentation Intent Type
(0008,0068) 1 Identifies the intent of the images that are contained within this Series.
Enumerated Values:
Attribute Name Tag Type DICOM Definition Implementation on CR Console Image Type (0008,0008) 1 Image identification characteristics.
See DICOM PS3-3 C.8.11.3.1.1 for specialization.
See 9.2.5.2.1.
Samples per Pixel (0028,0002) 1 Number of samples in this image.
Shall have an Enumerated Value of 1.
1
Photometric Interpretation
(0028,0004) 1 Specifies the intended interpretation of the pixel data.
Enumerated Values:
MONOCHROME1 MONOCHROME2
MONOCHROME1
Bits Allocated (0028,0100) 1 Number of bits allocated for each pixel sample.
Enumalated Values: 8, 16
Bits Stored (0028,0101) 1 Number of bits stored for each pixel sample.
Enumerated Values: 6 to 16
High Bit (0028,0102) 1 Most significant bit for pixel sample data.
Shall have an Enumerated value of one less than the value in Bits Stored (0028,0101).
Pixel Presentation (0028,0103) 1 Data representation of the pixel samples.
Shall have an Enumerated value:
0000H = Unsigned Integer
0000H
(0028,1041) 1 The sign of the relationship between the Pixel sample values stored in Pixel Data (7FE0,0010) and the X-ray beam intensity.
Enumerated Values:
1 = Lower pixel values correspond to less X-ray beam intensity -1 = Higher pixel values correspond to
less X-ray beam intensity.
See DICOM PS3.3 C.8.11.3.1.2 for further explanation.
-1
Rescale Intercept (0028,1052) 1 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
See DICOM PS3.3 C.8.11.3.1.2 for further explanation.
0
Rescale Slope (0028,1053) 1 m in the equation specified by Rescale intercept (0028,1052).
Enumerated Value: 1
See DICOM PS3.3 C.8.11.3.1.2 for further explanation.
1
Rescale Type (0028,1054) 1 Specifies the output units of Rescale Slope (0028,1053) and Rescale Intercept (0028,1052).
Enumarated Value: US = Unspecified.
See DICOM PS3.3 C.8.11.3.1.2 for further explanation.
US
Presentation LUT Shape
(2050,0020) 1 Specifies an identity transformation of the presentation LUT, other than to account for the value of Photometric Interpretation (0028,0004), such that the output of all grayscale transformations defined to be P-Values.
Enumerated Values:
IDENTITY INVERSE
See DICOM PS3.3 C.8.11.3.1.2 for further explanation.
INVERSE
Lossy Image Compression
(0028,2110) 1 Specifies whether an Image has undergone lossy compression.
Enumerated Values:
00 = Image has not been subjected to lossy compression.
01 = Image has been subjected to lossy compression.
See PS3.3 C.7.6.1.1.5 for further explanation.
Either of 00 or 01.
Lossy Image Compression Ratio
(0028,2112) 1C See DICOM PS3.3 C.7.6.1.1 for further explanation.
Required if Lossy Compression has been performed on the image.
Compression ratio
Acquisition Device Processing Description
(0018,1400) 3 Indicates any visual processing performed on the images prior to exchange.
See DIOM PS 3.3 C.8.11.3.1.3 for further explanation.
Sets menu name.
Exposure menu name.
Acquisition Device Processing Code
(0018,1401) 3 Code representing the device-specific processing associated with the image.
Sets menu code. Codifies the body part, exposure method and exposure menu.
Taken to be FFFF if no value exists.
Patient Orientation (0020,0020) 1 Patient direction of the rows and columns of the image.
See DICOM PS3.3 C.7.6.1.1.1 for further explanation.
Burned In Annotation (0028,0301) 1 Indicates whether or not image contains sufficient burned in annotation to identify the patient and date the images acquired.
Enumerated Values:
YES NO
NO
Window Center (0028,1050) 1C Defines a Window Center for display.
See DICOM PS3.3 C.8.11.3.1.5 for further explanation.
Required if Presentation Intent Type (0008,0068) is FOR PRESENTATION and VOI LUT Sequence (0028,3010) is not present.
May be present if VOI LUT Sequence (0028,3010) is present.
This tag type is 1C, but CR Console keeps this attribute with any condition.
Window Width (0028,1051) 1C Window Width for display.
See DICOM PS3.3 C.8.11.3.1.5 for further explanation.
Required if Window Center (0028,1050) is sent.
This tag type is 1C, but CR Console keeps this attribute with any condition.
VOI LUT Sequence (0028,3010) 3 Defines a sequence of VOI LUTs.
>LUT Descriptor (0028,3002) 1C Specifies the format of the LUT Data in this Sequence.
See PS3.3 C.11.2.1.1 for further explanation. Required if the VOI LUT Sequence (0028,3010) is sent.
>LUT Explanation (0028,3003) 3 Free from text explanation of the meaning of the LUT.
>LUT Data (0028,3006) 1C LUT Data in this Sequence.
Required if the VOI LUT Sequence (0028,3010) is sent.
9.2.5.2.1 Image Type
See 8.2.5.1.1. Note however that Value 1 and Value 3 are as follows.
Value 1:
ORIGINAL Normalized image (an exposed image that has been subjected to image processing, such as gradation processing.)
DERIVED An image created through morphological processing (long-view image, energy subtraction image).
Value 3:
Not determined.
9.2.5.3 DX Detector Module
Attribute Name Tag Type DICOM Definition Implementation on CR Console Detector Type (0018,7004) 2 The Type of detector used to acquire this
image.
Defined Terms;
DIRECT = X-ray photoconductor SCINTILATOR = Phosphor used STORAGE = Storage Phosphor FILM = Scanned film/Screen
STORAGE
Detector Configuration
(0018,7005) 3 The physical configuration of the detector.
Defined Terms;
AREA = single or tiled detector SLOT = scanned slot, slit or spot
SLOT
Sensitivity (0018,6000) 3 Detector sensitivity in manufacturer specific units.
Reading sensitivity
Field of View Shape (0018,1147) 3 Shape of the Field of View, that is the image pixels stored in Pixels
Data(7FE0,0010). that is the image pixels stored in Pixel Data (7FE,0010).
If Field of View Shape (0018,1147) is ; RECTANGLE: row dimension followed by
column.
ROUND: diameter HEXAGONAL: diameter of a
circumscribed circle.
Sets image size.
Imager Pixel Spacing
(0018,1164) 1 Physical distance measured at the front place of the detector housing between the center of each image pixel specified by a numeric pair – row spacing value (delimiter) column spacing value in mm.
Same as for Imager Pixel Spacing (0018,1164) defined in 8.2.6.2 CR Image Module.
9.2.5.4 DX Positioning Module
Attribute Name Tag Type DICOM Definition Implementation on CR Console Estimated
Radiographic Magnification Factor
(0018,1114) 3 Ratio of Source Image Distance (SID) over Source Object Distance (SOD).
Set a 1/100 SID/SOD value.
Positioner Type (0018,1508) 2 Defined Terms:
CARM
Notes: 1. The term CARM can apply to any positioner with 2 degrees of freedom of rotation of the X-ray beam about the Imaging Subject.
2. The term COLUMN can apply to any positioner with 1 degree of freedom of rotation of the X-ray beam about the Imaging Subject.
When CR or DX is used for Modality (0008,0060) and the following value is determined for determine the following value.
MAMMOGRAPHIC
Positioner Primary Angle
(0018,1510) 3 Position of the X-ray beam about the patient from the RAO to LAO direction where movement from RAO to vertical is positive, if Positioner Type (0018,1508) is CARM.
Body Part Thickness (0018,11A0) 3 The average thickness in mm of the body part examined when compressed if compression has been applied during exposure.
Compression Force (0018,11A2) 3 The compression force applied to the body part during exposure, measured in Newtons.