Left Ventricle T2 Mapping Quantification
| Purpose | Quantify T2 relaxation time of the myocardium of the left ventricle. |
| Tag(s) |
|
| Panel | Cardiac |
| Define-AI ID | 19040032 |
| Originator | Benoit Desjardins |
| Lead | Benoit Desjardins |
| Panel Chair | Carlo De Cecco |
| Panel Reviewers | Cardiac Panel |
| License | |
| Status | |
| RadElement Set | RDES141 |
Clinical Implementation
Value Proposition
Cardiac MRI is a noninvasive tool to assess cardiac morphology, function and characteristics of myocardial tissue. An important tissue characteristic is myocardial edema, often present in acute heart disease, either ischemic and non-ischemic. Disease with increased myocardial T2 values include myocarditis, myocardial infarct, graft rejection, Takotsubo cardiomyopathy, etc. The technique of T2 mapping (T2 transverse relaxation time mapping) builds a parametric image based on the transverse relaxation time of each voxel and offers a quantitative assessment of myocardial edema. An algorithm can automatically measure T2 values from T2 maps and alert the user if these measurements are higher than the normal range.Narrative(s)
A 30-year-old female presents in the ER with chest pain and elevated troponins. Acute myocarditis is suspected, given her age and lack of prior cardiac disease history. A cardiac MRI is ordered to evaluate function and myocardial edema to help confirm this diagnosis. MRI shows diffusely increased T2 map values in lateral wall, indicating myocardial edema, some decreased function and nonischemic late gadolinium enhancement pattern. Given these findings, acute myocarditis is the most likely diagnosis.Workflow Description
Pre-contrast T2 mapping is performed at 2 or 3 different short-axis levels in the left ventricle. On the resulting T2 map images, the LV myocardium is segmented. On each T2 map image, ROIs are traced in the septum, anterior wall, lateral wall and inferior wall. The average T2 value is computed for each ROI and displayed. A normal range of T2 values depending on scanner and field strength is also displayed. The algorithm alerts the physician if any of the myocardial walls show values above the normal range.
Considerations for Dataset Development
| Procedure(s) | Cardiac MRI |
| Sex at Birth | {Male, Female} |
| Age | [15,90] |
| Weight | [90 lbs, 350 lbs] |
Technical Specifications
Inputs
DICOM Study
| Procedure | Cardiac MRI |
| Views | N/A |
| Data Type | DICOM |
| Modality | X-ray |
| Body Region | Chest |
| Anatomic Focus | Heart |
Primary Outputs
Native T2
| RadElement ID | RDE945 |
| Definition | Native average T2 tissue for each ROI |
| Data Type | Numeric |
| Value Set | N/A |
| Units | ms |
Secondary Outputs
Presence of myocardial edema
| RadElement ID | RDE946 |
| Definition | Alert if ROI shows higher signal than the normal range |
| Data Type | Categorical |
| Value Set |
|
| Units | N/A |