[16 - bit monochrome2] pixel data representation question - DICOM

This is a discussion on [16 - bit monochrome2] pixel data representation question - DICOM ; hi, I got image with the following parameters (TransferSyntax - implicit LittleEndian): (...) (0028,0002) US 1 # 2 Samples per Pixel (0028,0004) CS [MONOCHROME2] # 12 Photometric Interpretation (0028,0010) US 512 # 2 Rows (0028,0011) US 512 # 2 Columns ...

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Thread: [16 - bit monochrome2] pixel data representation question

  1. [16 - bit monochrome2] pixel data representation question

    hi,

    I got image with the following parameters (TransferSyntax - implicit
    LittleEndian):
    (...)
    (0028,0002) US 1
    # 2 Samples per Pixel
    (0028,0004) CS [MONOCHROME2] # 12
    Photometric Interpretation
    (0028,0010) US 512
    # 2 Rows
    (0028,0011) US 512
    # 2 Columns
    (0028,0030) DS [0.6250000000\0.6250000000]
    # 26 Pixel Spacing
    (0028,0100) US 16
    # 2 Bits Allocated
    (0028,0101) US 16
    # 2 Bits Stored
    (0028,0102) US 15
    # 2 High Bit
    (0028,0103) US 1
    # 2 Pixel Representation
    (0028,0106) US 0
    # 2 Smallest Image Pixel Value
    (0028,0120) SS (no value available)
    # 2 Pixel Padding Value
    (0028,1052) DS [-1024]
    # 6 Rescale Intercept
    (0028,1053) DS [1]
    # 2 Rescale Slope
    (...)

    and then I got stream of bytes as a piece of pixel data:

    byte 0: 00000000
    byte 1: 10000000
    byte 2: 00000000
    byte 3: 10000000
    ....and so on....

    i wonder how to interpret that stream of pixel datas, because
    byte1byte0 (LittleEndian) means 1000000000000000, which assuming pixel
    representation = 1 (2's complement) is equals to -32768.... but the
    Smallest Image Pixel Value is 0.
    Any idea how to interpret that portion of image data ?


    best regards
    darek


  2. Re: [16 - bit monochrome2] pixel data representation question

    What is Pixel Padding Value ?

    David

    darod wrote:
    > hi,
    >
    > I got image with the following parameters (TransferSyntax - implicit
    > LittleEndian):
    > (...)
    > (0028,0002) US 1
    > # 2 Samples per Pixel
    > (0028,0004) CS [MONOCHROME2] # 12
    > Photometric Interpretation
    > (0028,0010) US 512
    > # 2 Rows
    > (0028,0011) US 512
    > # 2 Columns
    > (0028,0030) DS [0.6250000000\0.6250000000]
    > # 26 Pixel Spacing
    > (0028,0100) US 16
    > # 2 Bits Allocated
    > (0028,0101) US 16
    > # 2 Bits Stored
    > (0028,0102) US 15
    > # 2 High Bit
    > (0028,0103) US 1
    > # 2 Pixel Representation
    > (0028,0106) US 0
    > # 2 Smallest Image Pixel Value
    > (0028,0120) SS (no value available)
    > # 2 Pixel Padding Value
    > (0028,1052) DS [-1024]
    > # 6 Rescale Intercept
    > (0028,1053) DS [1]
    > # 2 Rescale Slope
    > (...)
    >
    > and then I got stream of bytes as a piece of pixel data:
    >
    > byte 0: 00000000
    > byte 1: 10000000
    > byte 2: 00000000
    > byte 3: 10000000
    > ...and so on....
    >
    > i wonder how to interpret that stream of pixel datas, because
    > byte1byte0 (LittleEndian) means 1000000000000000, which assuming pixel
    > representation = 1 (2's complement) is equals to -32768.... but the
    > Smallest Image Pixel Value is 0.
    > Any idea how to interpret that portion of image data ?
    >
    >
    > best regards
    > darek
    >


  3. Re: [16 - bit monochrome2] pixel data representation question

    Ignore that ... your dump says Pixel Padding Value is not
    present.

    David

    David Clunie wrote:
    > What is Pixel Padding Value ?
    >
    > David
    >
    > darod wrote:
    >> hi,
    >>
    >> I got image with the following parameters (TransferSyntax - implicit
    >> LittleEndian):
    >> (...)
    >> (0028,0002) US 1
    >> # 2 Samples per Pixel
    >> (0028,0004) CS [MONOCHROME2] # 12
    >> Photometric Interpretation
    >> (0028,0010) US 512
    >> # 2 Rows
    >> (0028,0011) US 512
    >> # 2 Columns
    >> (0028,0030) DS [0.6250000000\0.6250000000]
    >> # 26 Pixel Spacing
    >> (0028,0100) US 16
    >> # 2 Bits Allocated
    >> (0028,0101) US 16
    >> # 2 Bits Stored
    >> (0028,0102) US 15
    >> # 2 High Bit
    >> (0028,0103) US 1
    >> # 2 Pixel Representation
    >> (0028,0106) US 0
    >> # 2 Smallest Image Pixel Value
    >> (0028,0120) SS (no value available)
    >> # 2 Pixel Padding Value
    >> (0028,1052) DS [-1024]
    >> # 6 Rescale Intercept
    >> (0028,1053) DS [1]
    >> # 2 Rescale Slope
    >> (...)
    >>
    >> and then I got stream of bytes as a piece of pixel data:
    >>
    >> byte 0: 00000000
    >> byte 1: 10000000
    >> byte 2: 00000000
    >> byte 3: 10000000
    >> ...and so on....
    >>
    >> i wonder how to interpret that stream of pixel datas, because
    >> byte1byte0 (LittleEndian) means 1000000000000000, which assuming pixel
    >> representation = 1 (2's complement) is equals to -32768.... but the
    >> Smallest Image Pixel Value is 0.
    >> Any idea how to interpret that portion of image data ?
    >>
    >>
    >> best regards
    >> darek
    >>


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