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R8218/CT/private/dicom_dict_lookup.m
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dicom_dict_lookup.m
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function attr = dicom_dict_lookup(group, element, dictionary)
%DICOM_DICT_LOOKUP Lookup an attribute in the data dictionary.
% ATTRIBUTE = DICOM_DICT_LOOKUP(GROUP, ELEMENT, DICTIONARY) searches for
% the attribute (GROUP,ELEMENT) in the data dictionary, DICTIONARY. A
% structure containing the attribute's properties from the dictionary
% is returned. ATTRIBUTE is empty if (GROUP,ELEMENT) is not in
% DICTIONARY.
%
% Note: GROUP and ELEMENT can be either decimal values or hexadecimal
% strings.
% Copyright 1993-2010 The MathWorks, Inc.
% IMPORTANT NOTE:
%
% This function must be wrapped inside of a try-catch-end block in order
% to prevent the DICOM file from being left open after an error.
MAX_GROUP = 65535; % 0xFFFF
MAX_ELEMENT = 65535; % 0xFFFF
%
% Load the data dictionary.
%
persistent tags values prev_dictionary;
mlock;
% Load dictionary for the first time or if dictionary has changed.
if ((isempty(values)) || (~isequal(prev_dictionary, dictionary)))
[tags, values] = dicom_load_dictionary(dictionary);
prev_dictionary = dictionary;
end
%
% Convert hex strings to decimals.
%
if (ischar(group))
group = sscanf(group, '%x');
end
if (ischar(element))
element = sscanf(element, '%x');
end
if (group > MAX_GROUP)
error(message('images:dicom_dict_lookup:groupOutOfRange', sprintf( '%x', group ), sprintf( '(%x,%04x)', group, element )))
end
if (element > MAX_ELEMENT)
error(message('images:dicom_dict_lookup:elementOutOfRange', sprintf( '%x', element ), sprintf( '(%04x,%x)', group, element )))
end
%
% Look up the attribute.
%
% Group and Element values in the published data dictionary are 0-based.
index = tags((group + 1), (element + 1));
if (index == 0)
attr = struct([]);
else
attr = values(index);
end
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