Search Results for author: Nicholas Petrick

Found 7 papers, 3 papers with code

Image registration based automated lesion correspondence pipeline for longitudinal CT data

no code implementations25 Apr 2024 Subrata Mukherjee, Thibaud Coroller, Craig Wang, Ravi K. Samala, Tingting Hu, Didem Gokcay, Nicholas Petrick, Berkman Sahiner, Qian Cao

The algorithm employs a sequential two-step pipeline: (a) Firstly, an adaptive Hungarian algorithm is used to establish correspondence among lesions within a single volumetric image series which have been annotated by multiple radiologists at a specific timepoint.

TorchSurv: A Lightweight Package for Deep Survival Analysis

1 code implementation16 Apr 2024 Mélodie Monod, Peter Krusche, Qian Cao, Berkman Sahiner, Nicholas Petrick, David Ohlssen, Thibaud Coroller

TorchSurv is a Python package that serves as a companion tool to perform deep survival modeling within the PyTorch environment.

Survival Analysis

Designing monitoring strategies for deployed machine learning algorithms: navigating performativity through a causal lens

no code implementations20 Nov 2023 Jean Feng, Adarsh Subbaswamy, Alexej Gossmann, Harvineet Singh, Berkman Sahiner, Mi-Ok Kim, Gene Pennello, Nicholas Petrick, Romain Pirracchio, Fan Xia

When an ML algorithm interacts with its environment, the algorithm can affect the data-generating mechanism and be a major source of bias when evaluating its standalone performance, an issue known as performativity.

Causal Inference Ethics

Is this model reliable for everyone? Testing for strong calibration

1 code implementation28 Jul 2023 Jean Feng, Alexej Gossmann, Romain Pirracchio, Nicholas Petrick, Gene Pennello, Berkman Sahiner

In a well-calibrated risk prediction model, the average predicted probability is close to the true event rate for any given subgroup.

Fairness

Data AUDIT: Identifying Attribute Utility- and Detectability-Induced Bias in Task Models

no code implementations6 Apr 2023 Mitchell Pavlak, Nathan Drenkow, Nicholas Petrick, Mohammad Mehdi Farhangi, Mathias Unberath

To safely deploy deep learning-based computer vision models for computer-aided detection and diagnosis, we must ensure that they are robust and reliable.

Attribute Causal Inference +1

Monitoring machine learning (ML)-based risk prediction algorithms in the presence of confounding medical interventions

1 code implementation17 Nov 2022 Jean Feng, Alexej Gossmann, Gene Pennello, Nicholas Petrick, Berkman Sahiner, Romain Pirracchio

Performance monitoring of machine learning (ML)-based risk prediction models in healthcare is complicated by the issue of confounding medical interventions (CMI): when an algorithm predicts a patient to be at high risk for an adverse event, clinicians are more likely to administer prophylactic treatment and alter the very target that the algorithm aims to predict.

Bayesian Inference Selection bias +1

Sequential algorithmic modification with test data reuse

no code implementations21 Mar 2022 Jean Feng, Gene Pennello, Nicholas Petrick, Berkman Sahiner, Romain Pirracchio, Alexej Gossmann

Each modification introduces a risk of deteriorating performance and must be validated on a test dataset.

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