Mass Spectrometry Data Processing with Adaptive Qualifier Ion Tolerance
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Solution Overview
Problem
Conventional chromatographic mass spectrometers require cumbersome operations for target ion identification, as they cannot automatically combine absolute and relative toleration modes for qualifier ion ratio settings, leading to increased workload and potential errors, especially when dealing with multiple target compounds or qualifier ions.
Innovation Solution
A data-processing system for mass spectrometry that allows selection of three modes for qualifier ion ratio determination, including absolute, relative, and a mode that compares both tolerances to determine an appropriate identification range, reducing operator workload and enabling automatic target ion identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If conventional chromatographic mass spectrometers use automatic identification range determination for qualifier ion ratios, then the extent of automation is improved, but the device complexity increases due to multiple tolerance modes
Solution Approach 1:
The patent merges absolute toleration mode and relative toleration mode into a unified identification range determination system. The system automatically selects between these modes based on which provides a broader identification range, thereby combining the advantages of both approaches while maintaining automation. This resolves the contradiction by integrating multiple tolerance modes into a single automated decision-making framework.
Solution Approach 2:
The system dynamically changes the tolerance parameter based on the selected mode (absolute or relative). By automatically adjusting which tolerance parameter is applied based on the calculated identification ranges, the system maintains flexibility without requiring manual intervention. This parameter adaptation enables automated operation while managing the complexity of multiple tolerance modes.
2Reliability
If multiple qualifier ions are used for one target compound, then the reliability of target ion identification is improved, but the ease of operation deteriorates due to increased workload for visual determination
Solution Approach 1:
The system performs self-service by automatically determining identification ranges and evaluating qualifier ion ratios without requiring operator intervention. The automated process calculates identification ranges based on selected tolerance modes and automatically determines whether measured qualifier ion ratios fall within these ranges. This eliminates the need for operators to manually verify multiple qualifier ions, thereby maintaining high reliability while significantly reducing operational workload.
Solution Approach 2:
The system provides automated feedback by comparing measured qualifier ion ratios against calculated identification ranges and automatically determining identification results. This feedback mechanism handles multiple qualifier ions systematically, providing clear identification outcomes without requiring operators to perform complex visual determinations. The feedback loop maintains reliability through systematic evaluation while easing operational burden.
3Ease of operation
If absolute toleration mode is used for qualifier ion ratio determination, then the ease of operation is improved, but the reliability deteriorates when the calculated identification range is insufficiently broad
Solution Approach 1:
The system dynamically selects between absolute toleration mode and relative toleration mode based on which mode produces a broader identification range. This dynamic selection ensures that the system adapts to different analytical scenarios automatically. When absolute toleration provides sufficient coverage, it is used for simplicity; when relative toleration provides broader coverage, it is automatically selected to enhance reliability. This dynamic adaptation resolves the contradiction between ease of operation and reliability.
Solution Approach 2:
The system creates a composite approach by combining both absolute and relative toleration modes into a unified identification system. Rather than relying on a single mode, the system evaluates both and selects the most appropriate one, creating a composite solution that leverages the strengths of both approaches. This composite strategy ensures broad identification range coverage while maintaining operational simplicity through automated mode selection.
4Reliability
If relative toleration mode is used for qualifier ion ratio determination, then the reliability is improved by providing broader identification range, but the device complexity increases due to additional calculation requirements
Solution Approach 1:
The patent replaces manual calculation and evaluation mechanisms with automated computational processing. The system automatically performs the complex calculations required for relative toleration mode, including calculating identification ranges based on relative tolerances and comparing measured ratios against these ranges. This substitution of automated computation for manual calculation reduces the perceived complexity for operators while maintaining the reliability benefits of broader identification ranges.
Solution Approach 2:
The system performs self-service by automatically executing the complex calculations and mode selections required for reliable identification. The automated process handles all computational aspects of relative toleration mode without requiring operator intervention, thereby providing broad identification range coverage while masking the underlying calculation complexity from the user. This self-service approach maintains reliability through comprehensive calculation while preserving ease of operation.
Data Source
AI summary
A check condition setting screen, for confirming, whether a target ion originates from a target compound, is provided with qualifier ion mode choices: “ABSOLUTE TOLERATION,”“RELATIVE TOLERATION”, and “ABSOLUTE TOLERATION OR RELATIVE TOLERATION”. When the “ABSOLUTE TOLERATION OR RELATIVE TOLERATION” mode is set, an identification range Pa is calculated from a qualifier ion ratio reference value and an absolute tolerance, and an identification range Pr is calculated from the qualifier ion ratio reference value and a relative tolerance, for each qualifier ion for one target ion, and whichever of the two identification ranges is the greater is selected. In addition, when a setting to limit the upper limit value of an identification range to 100% is enabled, the upper limit value of the identification range is limited to 100%, and when the lower limit value of the identification range exceeds 100%, a warning display indicating above upper limit is performed.


