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R8218/private/dicom_tag_lookup.m
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dicom_tag_lookup.m
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function tag = dicom_tag_lookup(attr_name, dictionary)
%DICOM_TAG_LOOKUP Look up the data dictionary tag from a attribute name.
% Copyright 1993-2011 The MathWorks, Inc.
persistent all_names all_tags prev_dictionary tag_cache;
mlock
if ((isempty(all_names)) || (~isequal(prev_dictionary, dictionary)))
[all_names, all_tags] = get_dictionary_info(dictionary);
prev_dictionary = dictionary;
tag_cache = struct([]);
end
% As an optimization, attributes are cached the first time they're found.
% Query the cache.
if (isfield(tag_cache, attr_name))
tag = tag_cache.(attr_name);
return
end
% Look for the name among the attributes.
idx = find(strcmp(attr_name, all_names));
if (isempty(idx))
if (~isempty(strfind(lower(attr_name), 'private_')))
% It's private. Parse out the group and element values.
tag = parse_private_name(attr_name);
else
% It's not a DICOM attribute.
tag = [];
end
else
if (numel(idx) > 1)
warning(message('images:dicom_tag_lookup:multipleAttrib', attr_name));
idx = idx(1);
end
% Look for the index in the sparse array.
% (row, column) values are (group + 1, element + 1)
[group, element] = find(all_tags == idx);
tag = [group element] - 1;
end
tag_cache(1).(attr_name) = tag;
function [all_names, all_tags] = get_dictionary_info(dictionary)
%GET_DICTIONARY_INFO Get necessary details from the data dictionary
if (findstr('.mat', dictionary))
dict = load(dictionary);
all_names = {dict.values(:).Name};
all_tags = dict.tags;
else
[all_tags, values] = dicom_load_dictionary(dictionary);
all_names = {values(:).Name};
end
function tag = parse_private_name(attr_name)
%PARSE_PRIVATE_NAME Get the group and element from a private attribute.
attr_name = lower(attr_name);
idx = find(attr_name == '_');
if (~isempty(strfind(lower(attr_name), 'creator')))
% (gggg,0010-00ff) are Private Creator Data attributes:
% "Private_gggg_eexx_Creator" --> (gggg,00ee).
if (isempty(idx))
tag = [];
return;
end
group = sscanf(attr_name((idx(1) + 1):(idx(1) + 4)), '%x');
element = sscanf(attr_name((idx(2) + 1):(idx(2) + 4)), '%x');
tag = [group element];
elseif (~isempty(strfind(lower(attr_name), 'grouplength')))
% Skip Private Group Length attributes.
group = sscanf(attr_name(9:12), '%x');
tag = [group 0];
else
% Normal private data attributes: "Private_gggg_eeee".
group = sscanf(attr_name((idx(1) + 1):(idx(1) + 4)), '%x');
element = sscanf(attr_name((idx(2) + 1):(idx(2) + 4)), '%x');
tag = [group element];
end
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