SpinExchangeOpticalPumpingEfficiencyMonitor

Spin-Exchange Optical Pumping Efficiency Monitor

instrumental Hyperpolarized Xenon RPH Xe-129 medical gases CSV→JSON URS & FS rule-based

Utility description: Spin-Exchange Optical Pumping Efficiency Monitor

Spin-Exchange Optical Pumping Efficiency Monitor — SEOP Efficiency Monitor

ℹ️  Utility evaluates hyperpolarization process quality:
    • Achieved polarization level
    • Signal buildup time
    • Ratio to theoretical limit
    • Rubidium vapor density status

⚠️  CRITICAL: Low efficiency means loss of expensive gas!
    Main causes: laser degradation, heat leak, rubidium depletion.

Usage:
  SpinExchangeOpticalPumpingEfficiencyMonitor.exe                            → demo mode (console output)
  SpinExchangeOpticalPumpingEfficiencyMonitor.exe input.csv output.json      → evaluate your data

Input format:
BatchNumber,ProductName,Laser_W,Cell_T_C,Rb_Factor,B_Field_G,Initial_Pol_Percent,Buildup_Time_sec,Max_Theoretical_Pol,Min_Acceptable_Pol,Max_Buildup_Time

Example:
  SEOP-2026-001,Xe-129 Mix,100,180,1.0,15,45,40,55,40,60

— WHY IS THIS NEEDED?
SEOP efficiency control is critical for HP-Xe-129 production:
• Spin transfer process from optically pumped rubidium to xenon is complex and unstable
• Efficiency depends on laser power, cell temperature and gas purity
• Low efficiency results in gas with low polarization level, making MRI images unreadable
• Utility helps detect polarizer component degradation before entire gas batch is spoiled

⚠️  CRITICAL:
• Achieved polarization must be ≥80% of theoretical limit for given mixture
• Buildup Time must not exceed 60 seconds (for standard cells)
• Rubidium vapor density must match specified temperature (Rb factor control)
• Magnetic field stability is critical for spin orientation preservation

Key features:
• Relative process efficiency calculation (Actual vs Theoretical)
• Polarization buildup kinetics monitoring
• Rubidium cell problem diagnostics (temperature/density)
• Laser power impact assessment on final result

Critical parameters:
• Achieved Polarization: ≥40% (example threshold)
• Buildup Time: ≤60 sec
• Efficiency Ratio: ≥80%
• Rb Density Factor: 1.0 ± 0.2

💡 Usage tips:
1. Regularly calibrate rubidium cell temperature sensors
2. Monitor laser power at fiber output (degradation over time)
3. Use high-purity gases to maximize theoretical polarization limit
4. Perform pumping test cycles without gas to check magnetic field homogeneity
5. Maintain efficiency log to predict rubidium ampoule lifespan

⚠️ Note: Unlike chemical reactions where product yield is stable, SEOP efficiency can smoothly decrease over months due to cell wall "poisoning" or laser aging. The utility allows tracking this slow drift and planning preventive maintenance.

input.csv

BatchNumber,ProductName,Laser_W,Cell_T_C,Rb_Factor,B_Field_G,Initial_Pol_Percent,Buildup_Time_sec,Max_Theoretical_Pol,Min_Acceptable_Pol,Max_Buildup_Time
SEOP-2026-001,Xe-129 (90%) + N2,100,180,1.0,15,45,40,55,40,60
SEOP-2026-002,Xe-129 (85%) + O2,80,175,0.8,15,30,55,50,40,60
SEOP-2026-003,Xe-129 (Degraded Laser),100,180,1.0,15,20,80,55,40,60

URS & FS — user requirements and functional specification

URS & FS — User Requirements and Functional Specification

This document defines the controlled interface and behaviour of SpinExchangeOpticalPumpingEfficiencyMonitor for “Spin-Exchange Optical Pumping Efficiency Monitor”. Limits from the source description are an initial configuration and shall be reconciled with the approved specification, study protocol, equipment instructions and local SOPs before production use.

Domain constraints and critical parameters

Achieved Polarization: ≥40% (example threshold)
Buildup Time: ≤60 sec
Efficiency Ratio: ≥80%
Rb Density Factor: 1.0 ± 0.2

URS — User Requirements Specification

ID	Requirement	Criticality	Acceptance criterion
URS-001	The utility shall accept `input.csv` with the exact headers defined by the data contract.	High	The file is processed without manual header renaming.
URS-002	The utility shall perform a deterministic assessment for “Spin-Exchange Optical Pumping Efficiency Monitor”.	High	PASS / WARNING / FAIL is produced for each row.
URS-003	Required fields, types, ranges, units and data consistency shall be validated before domain rules.	High	Schema errors are separated from nonconformities.
URS-004	Critical limits from the description and approved local configuration shall create a critical finding.	High	A critical rule violation results in FAIL.
URS-005	The result shall be written to machine-readable `output.json`.	High	JSON contains source values, checks, warnings and failures.
URS-006	The conformity decision shall not use machine learning.	Medium	The result is reproducible from explicit rules and inputs.
URS-007	Traceability of batch, source file, rule version and final status shall be retained.	High	QA/QC can reproduce the decision.
URS-008	The utility shall have exactly one primary portal tag: `instrumental`.	Medium	The other api / instrumental / medical_devices tags are absent.
URS-009	Documentation shall support IQ/OQ/PQ or equivalent CSA/CSV verification.	Medium	The contract, test scenarios and change-control rules are supplied with the utility.

input.csv data contract

#	Field	Type	Unit	Sample	Purpose
1	`BatchNumber`	string	as specified	`SEOP-2026-001`	Batch/lot identifier for traceability.
2	`ProductName`	string	as specified	`Xe-129 (90%) + N2`	Name of the controlled product, gas, procedure or equipment.
3	`Laser_W`	decimal	W	`100`	SEOP laser-system parameter.
4	`Cell_T_C`	decimal	°C	`180`	Controlled input.csv field: Cell T C.
5	`Rb_Factor`	decimal	as specified	`1.0`	Controlled input.csv field: Rb Factor.
6	`B_Field_G`	decimal	G	`15`	Magnetic-field or field-homogeneity parameter.
7	`Initial_Pol_Percent`	decimal	%	`45`	Xe-129 hyperpolarization level, loss or target parameter.
8	`Buildup_Time_sec`	decimal	s	`40`	Time parameter for processing, relaxation, pumping or examination.
9	`Max_Theoretical_Pol`	decimal	as specified	`55`	Xe-129 hyperpolarization level, loss or target parameter.
10	`Min_Acceptable_Pol`	decimal	as specified	`40`	Xe-129 hyperpolarization level, loss or target parameter.
11	`Max_Buildup_Time`	decimal	as specified	`60`	Time parameter for processing, relaxation, pumping or examination.

BatchNumber,ProductName,Laser_W,Cell_T_C,Rb_Factor,B_Field_G,Initial_Pol_Percent,Buildup_Time_sec,Max_Theoretical_Pol,Min_Acceptable_Pol,Max_Buildup_Time
SEOP-2026-001,Xe-129 (90%) + N2,100,180,1.0,15,45,40,55,40,60
SEOP-2026-002,Xe-129 (85%) + O2,80,175,0.8,15,30,55,50,40,60
SEOP-2026-003,Xe-129 (Degraded Laser),100,180,1.0,15,20,80,55,40,60

FS — Functional Specification

ID	Function	Implementation
FS-001	CLI execution	`SpinExchangeOpticalPumpingEfficiencyMonitor.exe` supports demo mode and `input.csv output.json` mode.
FS-002	CSV import	Read UTF-8 CSV and validate header, column count and order.
FS-003	Schema validation	Validate required values, empties, types and basic plausibility.
FS-004	Domain rule engine	Apply explicit rules for “Spin-Exchange Optical Pumping Efficiency Monitor” and locally approved limits.
FS-005	Status aggregation	FAIL for a critical finding; WARNING for a non-critical deviation; PASS for conformity.
FS-006	JSON export	Write source values, applied rules, statuses, warnings, failures and configuration version.
FS-007	Audit support	Retain a result structure suitable for review, investigation, IQ/OQ and change control.
FS-008	Integration contract	LIMS/ELN/MES or an instrument wrapper creates CSV; the utility returns JSON.

output.json example

{
  "utilityId": "spin-exchange-optical-pumping-efficiency-monitor",
  "primaryTag": "instrumental",
  "overallStatus": "PASS|WARNING|FAIL",
  "sourceFile": "input.csv",
  "checks": [
    {
      "parameter": "BatchNumber",
      "value": "SEOP-2026-001",
      "status": "PASS|WARNING|FAIL",
      "message": "Rule-based check result"
    },
    {
      "parameter": "ProductName",
      "value": "Xe-129 (90%) + N2",
      "status": "PASS|WARNING|FAIL",
      "message": "Rule-based check result"
    },
    {
      "parameter": "Laser_W",
      "value": "100",
      "status": "PASS|WARNING|FAIL",
      "message": "Rule-based check result"
    },
    {
      "parameter": "Cell_T_C",
      "value": "180",
      "status": "PASS|WARNING|FAIL",
      "message": "Rule-based check result"
    },
    {
      "parameter": "Rb_Factor",
      "value": "1.0",
      "status": "PASS|WARNING|FAIL",
      "message": "Rule-based check result"
    },
    {
      "parameter": "B_Field_G",
      "value": "15",
      "status": "PASS|WARNING|FAIL",
      "message": "Rule-based check result"
    },
    {
      "parameter": "Initial_Pol_Percent",
      "value": "45",
      "status": "PASS|WARNING|FAIL",
      "message": "Rule-based check result"
    },
    {
      "parameter": "Buildup_Time_sec",
      "value": "40",
      "status": "PASS|WARNING|FAIL",
      "message": "Rule-based check result"
    }
  ],
  "warnings": [],
  "criticalFindings": []
}

OQ/PQ test scenarios

ID	Scenario	Expected result
OQ-001	Valid example row	PASS or an allowed WARNING under local rules.
OQ-002	Required column missing	Schema error; domain checks do not mask it.
OQ-003	Non-numeric value in numeric field	Type-conversion error.
OQ-004	Critical parameter outside its limit	FAIL and a critical finding.
OQ-005	Boundary value	The result follows the configured ≤ / ≥ / < / > operator.
PQ-001	Real site data	Agreed QA/QC review retaining CSV, JSON, version and checksum.

QA/QC and change control

Do not change column names without updating the validator, documentation and test set.
Retain input.csv, output.json, executable version, rule version and checksums.
Before production use, verify local limits and execute IQ/OQ/PQ or equivalent CSA.
Changes affecting patient safety, dosimetry, gas composition, polarization or equipment require documented impact assessment.

Included in packages

Rph Hyperpolarized Xenon Lifecycle QC Suite

29 utilities for the hyperpolarized xenon lifecycle: isotope composition and gas purity, SEOP and polarization, T1/storage/transport, safe blending and delivery, MRI/SPECT QC, dosimetry, scavenging, recovery and recycling.

Open

RPH isotope family: xenon and gas tracers

Xe-127, Xe-129 and Xe-133 for ventilation, hyperpolarized imaging, gas QC and safety.

Open

RPH organ/system: pulmonary and ventilation

Lung perfusion, MAA, V/Q, aerosol, xenon ventilation, shunt and pulmonary dosimetry.

Open

RPH use case: xenon, ventilation and medical gases

Xe-129, Xe-133, Xe-127, hyperpolarization, SEOP, T1, mixing, scavenging, transport, recovery and ventilation imaging.

Open

RPH workflow: dosimetry and therapy planning

Activity planning, absorbed dose, organ dose, lung shunt, preplanning and therapy verification.

Open

RPH workflow: imaging QC and quantitative interpretation

Acquisition, uptake, clearance, perfusion, transit, ejection fraction, segmentation and quantitative imaging.

Open

RPH workflow: stability, storage, decay and waste

Kinetic stability, shelf life, decay correction, expiry, storage, trend and radioactive waste.

Open