dicomread for grayscale images

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alan shen
alan shen 2021-1-13
回答： Anshika Chaurasia 2021-1-19
I am trying to get grayscale values for a jawbone dicom image, however, the values obtained for pixels do not seem to make sense. It says that data type is uint16. When i try to visually check the value correctness, a relatively gray area gives me a value of only 1000. I am expecting a value much larger as it is uint16 ranging from 0 to 65535.
Can somebody please take a look at my dicom file?
Thanks a lot!
Alan
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alan shen
alan shen 2021-1-13
Supplement: I just tested the layer 1 (IMG0001.dcm) individually, the value appears to be -1000 for the black color. I have no idea why....

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回答（1 个）

Anshika Chaurasia
Anshika Chaurasia 2021-1-19
Hi Alan,
First thing, int16 and uint16 datatypes are different.
  • int16 - 16-bit signed integer, [-32768, 32767]
  • uint16 - 16-bit unsigned integer, [0, 65535]
The image attached by you shows that datatype is int16 not uint16.
Refer to the following documentations on int16 and uint16 for more information.
Hpoe it helps you!

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