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	Creative Commons 4.0
Status	Published

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.

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)

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	RDE300
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	RDE302
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	RDE303
Definition	Ejection fraction (%) calculated as follows: (end-systolic volume – end-diastolic volume) / (end-systolic volume).
Data Type	Numeric
Value Set	[0,1]
Units	%

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