Pulmonary to Systemic Flow Ratio
| Purpose | Automate measurement of pulmonary to systemic flow ratio (Qp:Qs) |
| Tag(s) | #Qp:Qs |
| Panel | Cardiac |
| Define-AI ID | 18040022 |
| Originator | Benoit Desjardins |
| Panel Chair | Carlo De Cecco |
| Panel Reviewers | Cardiac Panel |
| License | |
| Status | Published |
Clinical Implementation
Value Proposition
Measurement of Qp:Qs is a well-established clinical parameter to determine degree of shunting that has fundamental diagnostic, therapeutic, and prognostic implications. Cardiac Magnetic Resonance (CMR) allow accurate assessment of flow parameters. Automated Qp:Qs quantification would save the interpreting physician time via elimination of manual measurements, prevent detection errors, and provide structured quantitative data, which could be used in later studies or risk stratification schemes.Narrative(s)
All patients undergoing CMR examinations which include flow measurements should have automated quantification of Qp:Qs if data are available, which may then be automatically populated into the radiology report or a report supplement.Workflow Description
Patient receives MRI of the chest/heart. Algorithm retrieves aortic and pulmonary flow imaging dataset if present and may ingest additional EMR data such as age, sex, and body surface area. Algorithm executes and calculates values of Qp:Qs. Algorithm also determines direction of shunting if shunt is present. Algorithm returns all measurements, which could populate the report (possibly within a supplement containing other quantitative data). Algorithm flags abnormal values.Considerations for Dataset Development
Procedures(s): MRI, Cardiac
View(s): CMR velocity-encoded phase contrast images, ascending thoracic aorta and pulmonary artery
Sex at Birth: {Male, Female}
Interventions: Congenital heart disease repair
Comorbidities: {Congenital heart disease, ventricular septal defects}
Pulmonary artery diameter (mm): [10,50]
Body Mass Index: [10,52]
Body Surface Area (m2): [1.0,3.5]
Other: Aliasing
Clinical Note: Alert radiologist to possible aliasing
Technical Specifications
Inputs
DICOM Study
| Procedure | MRI, Cardiac |
| Views | CMR velocity-encoded phase contrast images, ascending thoracic aorta and pulmonary artery |
| Data Type | DICOM |
| Modality | MR |
| Body Region | Chest |
| Anatomic Focus | Heart |
Primary Outputs
Pulmonary to Systemic Flow Ratio
| RadElement ID | RDE316 |
| Definition | Measurement of Qp:Qs using aortic and pulmonary flow measurements |
| Data Type | Numeric |
| Value Set | [0,5] |
| Units | N/A |
Secondary Outputs
Presence of Aliasing
| RadElement ID | |
| Definition | Presence of aliasing |
| Data Type | Categorical |
| Value Set | 0-Unknown 1-Aliasing present 2-Aliasing absent |
| Units | N/A |
Related Datasets
No known related public datasets at this time, please alert us if you know of any.