On 13/12/2007, Bryan Fodness <[EMAIL PROTECTED]> wrote:
> I am new to doing anything like this. I have looked at
> http://www.leadtools.com/SDK/Medical/DICOM/ltdc1.htm and am
> not sure how to proceed.
I haven't much experience here, but this is how I'd proceed, I think:
1. Start by reading the file. It's binary data (I guess) so there's
no point in reading lines.:
rawData = open('file.dcm', 'rb').read()
2. Write a function to parse the preamble:
def parsePreamble(data):
preamble = data[:128]
dicm = data[128:132]
# you might need to read up on encodings and things to make sure
this test is valid
if dicm == 'DICM':
return preamble, 132
else:
raise NotAPreambleException
3. Write functions to parse data elements. The functions are going to
try to parse a data element starting at a particular position, and if
successful, return the position of the end of the element.
def parseDataelement(data, start):
# do stuff -- the web page you linked didn't have enough information here
return element, pos
4. Parse the whole thing;
def parseDICOM(data):
elements = []
try:
preamble, next = parsePreamble(data)
except NotAPreambleException:
preamble, next = None, 0
while True:
element, next = parseDataElement(data, next)
elements.append(element)
# you will need some way of breaking out of this loop, either by
checking the structure of
# element for an end condition, or by parseDataElement raising
an exception.
return elements # and maybe preamble too if you want it
HTH!
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