# Development and tracking of inferior vena cava diameter after filter placement using a circle-fitting predictive model

## TL;DR

A new model predicts the shape and size of the inferior vena cava after filter placement, improving accuracy over traditional methods.

## Contribution

A circle-fitting predictive model is introduced to estimate IVC diameter more accurately after filter placement.

## Key findings

- The IVC transforms from oval to near-circular after filter placement, affecting diameter measurements.
- The predictive model shows better concordance with post-placement IVC diameters than single-angle measurements.
- The model's diameter estimates are more reliable than using maximum or minimum diameters alone.

## Abstract

The diameter of the inferior vena cava (IVC) is a critical factor in the decision-making process for IVC filter (IVCF) placement. A mismatched filter can compromise its stability and potentially lead to adverse events. This study develops and validates a predictive model using a circle-fitting algorithm to estimate the IVC diameter after filter placement. The findings suggest that single-angle measurements may misrepresent the filter-vessel compatibility, since the IVC transforms from an oval to a near-circular cross-section following filter placement. The predictive model, integrating three-dimensional, multi-angle cavography with circumference-based calculations, demonstrates excellent concordance with both post-placement maximum and minimum diameters in animal and clinical samples. Compared to the conventional single-angle measurements prior to IVCF placement, the predictive diameter can provide a more accurate and reliable representation of the IVC size, which was superior to either the maximum or minimum diameter alone, suggesting a higher predictive reliability. This model may provide a valuable tool for more accurate IVCF diameter selection and support future research.

•Proposes a predictive model with circle-fitting algorithm to estimate IVC diameter•Predictive diameter matches post-placement IVC diameter, with circular shape shift•Model provides more accurate IVC size estimation than single-angle measurements•Superior to maximum or minimum diameter alone, with higher predictive reliability

Proposes a predictive model with circle-fitting algorithm to estimate IVC diameter

Predictive diameter matches post-placement IVC diameter, with circular shape shift

Model provides more accurate IVC size estimation than single-angle measurements

Superior to maximum or minimum diameter alone, with higher predictive reliability

Surgery