How to best read in specific number values from large quantity of dicom images

I want to read in the value (100\250) from following unique lines in a large .ima file (can be read in notepad):

• sAngio.sFlowArray.asElm[0].nVelocity = 100
• sAngio.sFlowArray.asElm[0].nDir = 4
• sAngio.sFlowArray.asElm[1].nVelocity = 100
• sAngio.sFlowArray.asElm[1].nDir = 1

with:

fid = fopen ('filename')

expTP = fscanf(fid,'%[asElm[0].nVelocity =*^\n')

vencTP=regexp(expTP,%d,'match')

vencTP = str2num(vencTP)

expPE = fscanf(fid,'%[asElm[1].nVelocity =*^\n')

vencPE = regexp(expPE,%d,'match')

vencPE = str2num(vencPE)

Questions: 1) I have 560 .ima files all with 3xn.Velocity information each, is it the best way to 'fopen' all of them or is there a better way?

2) Its not working and I can't figure out why. Is my expr wrong for regexp fct?

Answer 1

[Walter Roberson]

http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F

[su]

Dear Walter,

Thanks for your link. For clarification and regards my second question:

So I have 560 files names similar as below:

• 4D_FLOW_1.MR.4DFLOW_WIP680_SKYRAXQ.0015.0001.2012.06.28.17.36.57.625000.57146750.ima
• 4D_FLOW_1.MR.4DFLOW_WIP680_SKYRAXQ.0015.0002.2012.06.28.17.36.57.625000.57146822.ima

In the very long text file I want to read in following lines, extracting the number at the end of (here) the line 1 and 3 :

• sAngio.sFlowArray.asElm[0].nVelocity = 100
• sAngio.sFlowArray.asElm[0].nDir = 4
• sAngio.sFlowArray.asElm[1].nVelocity = 100
• sAngio.sFlowArray.asElm[1].nDir = 1

With the link you send I changed my code to following:

       for k = 1:lenght(fl_list)
                file_name = ['*' num2str(k) '.ima'];
                fid = fopen('*.ima');
                textData = fread(fid);
                velTPCode = 'asElm[0].nVelocity = * /n';
                vencTP = regexp(velTPCode, '\d\d\d', 'match');
                fclose(fid);
            end

I want to have following information in the end for this example (but automated for the whole code, so I can apply it to all 560files):

    >>vencTP  
    vencTP = 100
    >>vencPE
    vencPE = 100

[su]

I believe that in

velTPCode = 'asElm[0].nVelocity = * /n';

the * might be an issue, I want to include it in the line selection to extract the number value afterwards. How to do that?

Then I need to define that matlab should only read the number:

vencTP = regexp(velTPCode, '\d\d\d', 'match');

defined here with expr as '\d\d\d' (a 3degit number) but it comes up as empty, is that cause of the * above?