General Description
Df1 File Format is the image storage system used by "Volume Processor .Net". A df1
data consists of two files:
• an image file
• a header file
The files have the same name being distinguished by the extensions
.df1 for the image file and .hd1 for the header file.
Image File
The format of the image file is raw, only having
the file extension changed.
Header File
The header file is a simple file used to store
the basic information about the image file. It's structure is depicted below.
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Contents
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Data type
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Number
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Length, bytes
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Byte offset from beginning of file
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Comments
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Little-endian byte ordering is assumed.
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Width
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Integer
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1
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2
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0
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image width
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Height
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Integer
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1
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2
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2
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image height
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Number of Images
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Integer
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1
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2
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4
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Offset to first image
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Integer
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1
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2
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6
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X scale
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Float, 4 bytes
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1
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4
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8
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voxel dimension in mm scale
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Y scale
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Float, 4 bytes
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1
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4
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12
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voxel dimension in mm scale
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Z scale
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Float, 4 bytes
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1
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4
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16
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voxel dimension in mm scale
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Direction cosines
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Char, 1 byte
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6
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8-14
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20
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Direction cosines representing the direction of coordinate axes compared to Dicom
coordinate space
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