LIDC-IDRI preprocessing steps

[sajidalirander]

Hi @ymli39,

Thanks for sharing your work.

I have reproduced the results for LUNA16 dataset. I am working to do the same with LIDC-IDRI dataset.

I have encountered a problem and need some clarification.

I am using prepareLIDC.py file. It takes three inputs: (1) preprocess path, (2) data_path, (3) new_nodule csv file path.

new_nodule.csv contains patients nodules until LIDC-127 and multiple slices. When I run the script, xx, yy, and zz will be zero for other patients ID, i.e., beyond LIDC-127. Another question is that how did we know which slice has nodule with new_nodule.csv file alone?

I also explored new_non_nodule.csv which also have the same patients ID and until LIDC-127. It does not have slice information as well.

Another question is what was the data structure? I have as follows: LICD-IDRI-Data

• LICD-IDRI-0001 - dicom files
• LICD-IDRI-0002 - dicom files (...)

Thank you for your time and effort.

[ymli39]

Hi @sajidalirander, LIDC continas a subset of CT scans with slice thickness>=5mm and CT scans from LUNA dataset, I remember I excluded those LUNA scans from LIDC task. That's probably the reason you only see LIDC up to ID127. You can find the corresponding LIDC id from sid2csv.csv. Unfortunately, I don't recall the data structure since it has been several years.

[sajidalirander]

Thank you for the response. Could you provide details about extracting the mask without knowing the slice number?

[ymli39]

Sorry about taking some time to get back to you. I remember LIDC has the xml file online, it shows the location (x,y,z,d) of the nodule per scan. I extracted the info based on those files.

[shweta2266]

Hi @sajidalirander,

Can you please share the details of how you reproduced the results using luna dataset. I tried the same pipeline. The training was okay using luna_train.npy and I got around 97% tpr and 99% tnr. However, when I tested on test cases mentioned in luna_test.npy, I did not get any predicted bounding boxes with threshold -3. I also tried with different threshold, but still not getting any bounding box.

Hi @ymli39, can you please look into this and provide some help?

Thanks and regards Shweta

[sajidalirander]

Hi, @shweta2266

Is the evaluation script saving the bounding box files as empty?

Try the following debugging steps:

1. Please check the test.npy file. Make the samples code in 3 digits.
2. Check if the right configuration files is loaded.

If nothing works, please share the script you are working with.

[shweta2266]

Hi @sajidalirander,

Thank you so much for your response. I could reproduce the results.