STIR Inversion Time Calculator
Ideal180degreefullrecoverySTIR fat null TI=T1ln2, actualfatT1independent, finiteTR/non ideal flip correction omitted; not recommendedscanTIor diagnosis.
Description
Ideal inversion recovery nulls a component at a time related to its longitudinal relaxation constant.
Ideal inversion recovery nulls a component at a time related to its longitudinal relaxation constant.1
This tool evaluates the fully recovered ideal STIR fat-null relation without choosing a clinical scan setting.
When to use STIR Inversion Time Calculator
This tool evaluates the fully recovered ideal STIR fat-null relation without choosing a clinical scan setting.
How to use STIR Inversion Time Calculator and how it works
- Prepare independent fat t1 milliseconds, using the input definitions and matching units below.
- Enter the required fields and run STIR Inversion Time Calculator.
- Read result.value using the units, signs and ordering explained below.
- Correct any rejected inputs and rerun; interpret the result within the stated model and its assumptions.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| callerIndependentFatT1Milliseconds | Caller Independent Fat T1 Milliseconds. Use the units and matching context stated in the calculation below. | number | Required; strictly positive; finite; other constraints below |
Require positive independently established fat T1 in milliseconds. Return T1*ln(2) as milliseconds under ideal 180-degree inversion and full longitudinal recovery. Finite repetition-time, nonideal inversion and clinical scan selection are not modeled.
idealNullTiMs=fatT1Ms*ln(2) Apply the input ordering, units and branch conditions stated above.
| Output field | Meaning | Value type |
|---|---|---|
| result | Object containing the calculated or selected fields below. | object |
| result.value | Ideal fat-null inversion time in milliseconds. | number |
{
"input": {
"callerIndependentFatT1Milliseconds": 200
},
"output": {
"result": {
"value": 138.62943611198907
}
}
}Limitations and assumptions
The calculation uses the supplied observations and model inputs. It does not collect measurements, select a reference population or coefficient, or establish that the model applies to the actual case. The stated branch conditions and output units remain part of the result.
All fields require explicit values. Unexpected fields, wrong types, nonfinite numbers and sparse arrays are rejected. Alignment, bounds and supported-token rules are explained above; extremely large inputs or nonfinite results can also fail. Input errors differ from successful false comparisons, unavailable-domain flags and empty match lists.
Alternative or Complementary methods
Use Fat Saturation Frequency Offset Calculator for a complementary operation: A chemical shift in ppm becomes a frequency offset when multiplied by a matched resonance-frequency basis.
Use Chemical Shift Hz to PPM Converter for a complementary operation: A chemical shift in ppm expresses a signed frequency difference relative to a specified resonance frequency.
References
-
STIR Inversion Time Calculator — tool.io
Similar or alternative tools
- Fat Saturation Frequency Offset Calculator
A chemical shift in ppm becomes a frequency offset when multiplied by a matched resonance-frequency basis.
- Chemical Shift Hz to PPM Converter
A chemical shift in ppm expresses a signed frequency difference relative to a specified resonance frequency.