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Re: Byte to Real conversion [message #14335 is a reply to message #14334]

Fri, 19 February 1999 00:00

David Foster
Messages: 341
Registered: January 1996

Senior Member

Michael A. Wirth wrote:
>
> Hi,
>
> I am reading some data in from an Magnetic Resonance image which stores
> information about the image in
> a 14336 byte header. I want to extract some of the data from this header
> and am having a problem
> with converting data to integers and reals. The integers are 2-bytes and
> the reals 4-bytes in length. How does
> one convert 4 bytes into a real number?

Michael -

Hmm, that number 14336 sure looks familiar! Are you working with
GE Signa images by any chance? I have C code that has routines to
pull out integer, byte, and float information from the header. The
main routine prints out a listing of important information from
the header. There is also a .h file that lists the offsets for
every entry in the file.

The conversion of floats does *not* look straightforward!

I'll send you an email with this code attached. I haven't had time
to port the code to IDL, so I wrote a short wrapper that spawns
the C program and returns the info in a structure. Let me know
if you're interested in this.

Hope this helps.

Dave
--

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~
David S. Foster Univ. of California, San Diego
Programmer/Analyst Brain Image Analysis Laboratory
foster@bial1.ucsd.edu Department of Psychiatry
(619) 622-5892 8950 Via La Jolla Drive, Suite 2240
La Jolla, CA 92037
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~

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[Message index]

		Re: Byte to Real conversion By: David Foster on Fri, 19 February 1999 00:00
		Re: Byte to Real conversion By: David Foster on Fri, 19 February 1999 00:00
		Re: Byte to Real conversion By: Liam Gumley on Fri, 19 February 1999 00:00

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