Left Atrial Size
Purpose | Automate left atrial size measurements on CT |
Tag(s) | |
Panel | Cardiac |
Define-AI ID | 18040007 |
Originator | Jay Nance |
Panel Chair | Carlo De Cecco |
Panel Reviewers | Cardiac Panel |
License | |
Status | Published |
Clinical Implementation
Value Proposition
Evaluation of left atrial (LA) size is important to identify global cardiac abnormalities and intrinsic abnormalities of the left atrium and to suggest valvular disease. Cardiac CT angiography (CCTA) allows for accurate LA morphological assessment. Automated LA size quantification would save the interpreting physician time by eliminating manual measurements and preventing detection errors and would provide structured quantitative data that could be used in later studies or risk stratification schemes.Narrative(s)
All patients undergoing CCTA examinations should have automated quantification of LA size if data are available, which may then be automatically populated into the radiology report or a report supplement.Workflow Description
The patient receives ECG-synchronized CCTA of the heart. The algorithm retrieves the imaging data set and may ingest additional electronic medical record data such as age, sex, and body surface area (BSA). The algorithm calculates local values for LA size during diastole and systole. Both indexed volumes (ie, normalized to BSA) and absolute anteroposterior diameter should be reported. Volumes should be reported at end-systole and end-diastole if available. All future references to end-systole and end-diastole refer to ventricular systole and diastole, as per convention. The algorithm returns all measurements.Considerations for Dataset Development
Procedures(s): ECG-synchronized cardiac CT
View(s): CCTA – volumetric imaging dataset
Sex at Birth: {Male, Female}
Age (years): [15,100]
Body Surface Area (m2): [1,3]
Comorbidities: {Congenital heart disease, Ventricular septal defects}
Intervention: Congenital heart disease repair
Other: Contrast-enhanced (CCTA)
Technical Specifications
Inputs
DICOM Study
Procedure | ECG-synchronized cardiac CT |
Views | CCTA – volumetric imaging dataset |
Data Type | DICOM |
Modality | CT |
Body Region | Chest |
Anatomic Focus | Heart |
Primary Outputs
Left Atrial Volume During End Systole
RadElement ID | |
Definition | Measure LA volume during end-systole (ventricular systole), where it should be highest, and normalize to BSA |
Data Type | Numeric |
Value Set |
|
Units | mL3 |
Left Atrial Volume during End Diastole
RadElement ID | RDE301 |
Definition | Measure LA volume (mL3) during end-diastole (ventricular diastole), where it should be lowest, and normalize to BSA |
Data Type | Numeric |
Value Set |
|
Units | mL3 |
Left Atrial Diameter during End Systole
RadElement ID | |
Definition | Measure LA diameter during end-systole (ventricular systole), where it should be highest |
Data Type | Numeric |
Value Set |
|
Units | mm |
Left Atrial Ejection Fraction
RadElement ID | |
Definition | Ejection fraction (%) calculated as follows: (end-systolic volume – end-diastolic volume) / (end-systolic volume). |
Data Type | Numeric |
Value Set | [0,1] |
Units | % |
Related Datasets
No known related public datasets at this time, please alert us if you know of any.