dicom metadata I need some loop to read item_1,item_2,item_3 in a dicom file

I have a file that contains a number of control points. Each one has several values that repeat and change from field to field:Here is an example

item_1
item_2
item_3
item_4

What kind of loop can I use to define these as an array like

for i=1,control points 
Segment(i) = (item_1 then Item_2 then item _3) or really item_i resulting in 3 separate segments segment1 segment2 segment3.

The underscore is driving me insane.

Nothing I have tried seems to work.

[robbie hakeem]

I understand that but these values are already in a Dicom file I am reading . So how do I read them .

Item-1 2 etc and those repeat very often .

Answer 1

[Walter Roberson]

http://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

[Walter Roberson]

dicominfo returns a struct; https://www.mathworks.com/help/images/ref/dicominfo.html

Do not store the items as individual variables: use dynamic field naming off of the struct.

[Harlan Romsdahl]

Yes, it does returns a nested struct. The problem is there can be variable length sequences in the metadata. For example, a multi-frame object will have PerFrameFunctionalGroupsSequence with an item per frame. In my case, I have a 152 frame image and I want to iterate through the frame sequence. However, it is a structure with eement names: Item_1, Item_2, ... Item_152. How do I iterate through the 152 named elements of the structure? This is what MATLAB function"dicomCollection()" returns. \

[Walter Roberson]

dinfo = dicominfo(FILENAME);
N = 152;
item_values = cell(N,1);
for K = 1 : N
    varname = "item_" + K;
    item_values{K} = dinfo.(varname);
end