Multi-Resolution Mass Spectrometer Scan Rate Segmentation
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Solution Overview
Problem
Current mass spectrometry systems face limitations in achieving varying resolutions across different regions of a mass spectrum without significantly increasing the duration of the scan, leading to practical issues such as detector saturation and system instability.
Innovation Solution
A multi-resolution mass spectrometer system and method that allows for discrete scanning rates within specific m/z regions to achieve appropriate resolutions, switching between known and desired scan rates to optimize peak resolution without extending the total scan duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the scan rate is reduced across the entire mass spectrum to improve mass resolution, then the mass resolution is improved, but the total scan duration is significantly increased
Solution Approach 1:
The mass spectrum scan range is divided into multiple segments or regions, each with different resolution requirements. The system applies different scan rates to different m/z regions, using slower scan rates only in regions requiring high resolution while maintaining faster scan rates in other regions, thereby achieving high resolution where needed without proportionally increasing the total scan time.
Solution Approach 2:
Different regions of the mass spectrum are assigned different quality characteristics in terms of resolution. The system identifies specific m/z regions that require high resolution and applies enhanced scanning parameters locally to those regions, while using standard scanning parameters in regions where lower resolution is acceptable, thus optimizing the balance between resolution and scan time.
2Measurement precision
If the scan rate is reduced to achieve unit mass resolution in selected regions, then the mass resolution is improved, but practical problems arise including detector saturation and system electronics instability
Solution Approach 1:
The scan rate is made dynamic rather than fixed, allowing the system to adjust the scanning speed in real-time based on the specific requirements of different m/z regions. This dynamic adjustment enables the system to achieve high resolution in critical regions while maintaining stability and avoiding detector saturation in other regions by using appropriate scan rates.
Solution Approach 2:
The system changes scanning parameters (scan rate) based on the specific requirements of different mass spectral regions. By modifying the scan rate parameter locally rather than globally, the system achieves high resolution where needed while maintaining system stability and avoiding the harmful effects of uniformly slow scanning such as detector saturation and electronics drift.
Data Source
AI summary
A multi-resolution mass spectrometer system and intra-scanning method is introduced to enhance the measured peak resolution at different regions of a given mass spectrum while not significantly increasing the total duration of the scan. Such an arrangement enables extra resolution where necessary, such as, for example, when incorporating a slower scan rate only over a predetermined narrow low mass marker region of a given mass spectrum. Once past the marker region, the scan rate can be increased to provide the appropriate resolution for peptide identification.