Description
Normalize a supplied event offset by a positive cardiac-cycle duration.
Cardiology records distinguish event times, signal intervals, recording duration, paper calibration and Doppler angle conventions. A waveform distance requires a stated recording speed, and a signed projected velocity is not a diagnosis. Timing fractions and source labels do not establish cardiac function or appropriate care.
Normalize a supplied event offset by a positive cardiac-cycle duration.
When to use this tool
Use Cardiac Cycle Phase Fraction when you already have eventOffsetMilliseconds, cycleMilliseconds and need to normalize a supplied event offset by a positive cardiac-cycle duration.
How to use the tool and how it works
- Enter eventOffsetMilliseconds, cycleMilliseconds. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read phaseFraction, withinCycle. Inspect withinCycle before interpreting the associated values.
Require cycleMilliseconds>0; phase=eventOffset/cycle and withinCycle=0<=offset<cycle.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| eventOffsetMilliseconds | Event Offset Milliseconds | Required. Finite number. |
| cycleMilliseconds | Cycle Milliseconds | Required. Finite number; strictly above 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| phaseFraction | eventOffsetMilliseconds/cycleMilliseconds without wrapping. | Required. Finite number. |
| withinCycle | True for offset in [0,cycleMilliseconds), excluding the final endpoint. | Required. Boolean. |
{
"input": {
"eventOffsetMilliseconds": 200,
"cycleMilliseconds": 800
},
"output": {
"phaseFraction": 0.25,
"withinCycle": true
}
}Limitations and assumptions
- No wrapping is applied and fractions outside [0,1) are retained. No cycle, event, cardiac phase, rhythm or clinical interpretation is detected.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Review the original trace, acquisition settings, measurements and complete clinical context. Use the appropriate professional assessment for interpretation; local conversions and flags do not identify rhythms, assess disease or guide treatment.
References
Similar or alternative tools
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