FFF.2.1.5.4.2 Field of View on Digital Detector

The following examples show three different ways to create the stored image from the same detector matrix.

In the figures below:

Note that the detector active dimension is not necessarily the FOV dimension.

In all the examples,

In the first example, there is neither binning nor resizing between the detector matrix and the stored image.

Below are the encoded values of the key attributes of this example:

Rows       (0028,0010) = 8
Columns   (0028,0011) = 8
X-Ray Receptor Type (0018,9420) = DIGITAL_DETECTOR
Detector Binning (0018,701A) = 1.0\1.0
Detector Element Spacing (0018,7022) = 0.2\0.2
Position of Isocenter Projection (0018,9430) = 5\7
Per-Frame Functional Groups Sequence (5200,9230)    
           
  Item i    
    >Field of View Sequence (0018,9432)    
      Item 1      
        >>Field of View Shape (0018,1147)
      Item 1      
        >>Imager Pixel Spacing (0018,1164) =

[pic]

Figure FFF.2.1-26Attributes of the first example of Field of View on Digital Detector

In the second example, there is a binning factor of 2 between the detector matrix and the digital image. There is no resizing between the digital image (binned) and the stored image.

Below are the encoded values of the key attributes of this example:

Rows       (0028,0010) = 4
Columns   (0028,0011) = 4
X-Ray Receptor Type (0018,9420) = DIGITAL_DETECTOR
Detector Binning (0018,701A) = 2.0\2.0
Detector Element Spacing (0018,7022) = 0.2\0.2
Position of Isocenter Projection (0018,9430) = 5\7
Per-Frame Functional Groups Sequence (5200,9230)  
         
  Item i  
    >Field of View Sequence (0018,9432)
      Item 1  
        >>Field of View Shape (0018,1147)
      Item 1    
        >>Imager Pixel Spacing (0018,1164) =

[pic]

Figure FFF.2.1-27 Attributes of the second example of Field of View on Digital Detector

In the third example, in addition to the binning factor of 2 between the detector matrix and the digital image, there is a resizing of 0.5 (downsizing) between the digital image (binned) and the stored image.

Below are the encoded values of the key attributes of this example:

Rows       (0028,0010) = 2
Columns   (0028,0011) = 2
X-Ray Receptor Type (0018,9420) = DIGITAL_DETECTOR
Detector Binning (0018,701A) = 2.0\2.0
Detector Element Spacing (0018,7022) = 0.2\0.2
Position of Isocenter Projection (0018,9430) = 5\7
Per-Frame Functional Groups Sequence (5200,9230)    
           
  Item i    
    >Field of View Sequence (0018,9432)    
      Item 1      
        >>Field of View Shape (0018,1147)
      Item 1    
        >>Imager Pixel Spacing (0018,1164) =

[pic]

Figure FFF.2.1-28 Attributes of the third example of Field of View on Digital Detector

Note that the description of the field of view attributes (dimension, origin) is the same in these three examples. The field of view definition is independent from the binning and resizing processes.