sicritfix 0.0.9

Python package to detect and correct oscillatory artifacts in mass spectrometry mzML data.

Oscillations_Corrector_Algorithm_SICRIT

Suppressing Signal Artifacts in CE-SICRIT-MS via Oscillation Processing

This repository contains a Python tool to detect and correct oscillations that appear in mass spectrometry (MS) spectra acquired with the SICRIT ionization source. The program reads .mzXML or .mzML files, identifies oscillatory m/z signals via FFT analysis, corrects their intensities, and outputs cleaned .mzML files.

The tool includes a command-line interface (CLI) to process single files or whole folders.

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Table of Contents

• Introduction
• Installation
• Usage
  • Processing a Single File
  • Processing a Folder of Files
  • Command-Line Options
• Detection and Correction Workflow
• Examples
• License

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Introduction

This Python module provides a pipeline for correcting oscillatory artifacts in CE-SICRIT-MS spectra.
It includes:

• Automatic loading of .mzML and .mzXML files.
• Conversion of .mzXML to .mzML using ProteoWizard MSConvert.
• Detection of oscillatory m/z values using FFT-based power analysis.
• Correction of intensity oscillations via residual signal reconstruction.
• Saving corrected spectra in .mzML format.

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Installation

If you want to use the last released version, it is published in pypy already.

pip install sicritfix

If you want to install the source code or develop over it, clone the repository and install the dependencies inside a conda environment. If you want to run the CLI you shall install it as a module.

git clone https://github.com/ceu-biolab/Oscillations_Corrector_Algorithm_SICRIT.git
cd Oscillations_Corrector_Algorithm_SICRIT

conda create -n sicritfix python=3.12
conda activate sicritfix
pip install -e .

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Usage

You can run the program from the command line after installation.
Both single files and folders are supported.

Processing a Single File

Run the tool with an input file:

sicritfix input_file.mzXML --output corrected.mzML --overwrite

If no --output is provided, the tool will automatically generate a filename by appending _corrected.mzML.

Processing a Folder of Files

To process an entire folder of .mzXML files, simply pass the folder path as input.
Each file will be automatically converted to .mzML, processed, and saved.

python CLI.py /path/to/folder --overwrite --verbose

During execution you’ll see messages like:

file: sample1.mzXML loaded correctly
file: sample2.mzXML loaded correctly

Command-Line Options

• --output : Output path (optional).
• --overwrite : Overwrite existing files.
• --plot : Show diagnostic plots.
• --verbose : Print detailed execution logs.
• --mz_window : m/z bin size for oscillation detection (default: 0.01). Increasing this value groups nearby m/z peaks into larger bins, making the algorithm less sensitive to small differences in m/z but more tolerant to noise. Decreasing it makes detection more precise at the cost of possibly missing weak or noisy signals.
• --rt_window : Retention time window for XIC smoothing (default: 0.01). This controls how intensities are aggregated across retention time. A larger value smooths the signal more strongly, which can improve frequency detection but may blur fine details in short peaks. A smaller value preserves fine temporal resolution but may leave more noise in the XIC. Note: Both parameters should be adjusted depending on the type of signa being processed.

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Detection and Correction Workflow

1. Load the input file(s).

   • If .mzXML is detected, it is converted to .mzML.

2. Extract relevant MS data.

   • Retention times (RT), m/z values, and intensities.

3. Detect oscillating m/z values.

   • Uses FFT-based power spectrum analysis.

4. Correct oscillations.

   • Subtracts a modeled sinusoidal component to recover residual signal.

5. Update spectra.

   • Replace oscillating intensities with corrected values.

6. Save results.

   • Corrected file is written to disk in .mzML format.

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Examples

Process a single file:

sicritfix data/sample.mzXML --plot

or

python CLI.py data/sample.mzXML --plot

Process all files in a folder:

sicritfix data/sample.mzXML --overwrite

or

python CLI.py data/sample.mzXML --overwrite

Verbose mode:

sicritfix data/sample.mzXML --verbose

or

python CLI.py data/sample.mzML --verbose

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License

This project is licensed under the GNU General Public License v3.0.

You are free to use, modify, and distribute the software, but any derivative work must also be open-source under the GPL-3.0 license.

For more details, see the full GPL-3.0 license.