Author

A. Katumba

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Sep 2026

Enhancing Visual Reasoning in Chest X-Ray Report Generation Using Reinforcement Learning

Medical report generation has made significant progress with the rise of modern vision-language models and the growing availability of large-scale medical datasets. However, hallucinations remain a major challenge, largely due to the limitations of supervised fine-tuning (SFT), which prioritizes lexical similarity to r...

D. Musinguzi, A. Katumba, Prasenjit Mitra · arXiv.org · 0 citations

Preprint Sep 2026

Does Vision-Language Pretraining Granularity Matter? A Controlled Evaluation of Vision-Language Objectives Across Chest X-Ray Interpretation Tasks

Vision-language pretraining objectives differ in the spatial granularity of their supervision, yet the implications of this distribution for chest X-ray interpretation remain underexplored. We present a controlled study that isolates the pretraining objective: holding the encoder and pretraining data fixed, we train ni...

D. Musinguzi, A. Katumba, Prasenjit Mitra · 0 citations