Need help searching through a DICOM structure

I have a structure ( a DICOMDIR and its files) that I want to search and select certain items for further use. I have been able to read in the DICOMDIR as follows:

 dd = dicominfo('path/DICOMDIR');

The next step is to review the items in dd.DirectoryRecordSequence such as

 dd.DirectoryRecordSequence.Item_1

There are about 1400 items and I want to index through them with a loop. I can get the proper information with the following:

 getfield(dd.DirectoryRecordSequence,'Item_1')

and I can get an array of the field names,

 fn = fieldnames(dd.DirectoryRecordSequence);
so that fn(1) is

 ans =

 1×1 cell array

 {'Item_1'}

But

 getfield(dd.DirectoryRecordSequence, fn(1))

does not work. How do I go about getting this so I can index it by referencing

 fn(i) {where  i = 1 to 1400}?

Thank you

[Patrick Ford]

I need to use the char function:

 dd.DirectoryRecordSequence.(char(fn(3)))

Answer 1

[Walter Roberson]

 getfield(dd.DirectoryRecordSequence, fn{1})

or

dd.DirectoryRecordSequence.(fn{1})

You do not need char() -- just use the right indexing style