Privacy Leakage in Federated Learning in Radiology Reports: Comparative Evaluation of Tokenizer and Batch-Size Privacy Risks

Santhosh Parampottupadam   ^{1, 2} , MSc, PhD ;   Andrés Martínez Mora   ¹ , PhD ;   Dimitrios Bounias   ^{1, 2} , PhD ;   Sinem Sav   ³ , Prof Dr ;   Klaus Maier-Hein   ^{1, 2, 4} , Prof Dr ;   Ralf Floca   ¹ , PhD

¹ Division of Medical Image Computing, German Cancer Research Center, Heidelberg, Baden-Wurttemberg, Germany

² Medical Faculty Heidelberg, Heidelberg University, Heidelberg, Germany

³ Department of Computer Engineering, Bilkent University, Ankara, Türkiye

⁴ Pattern Analysis and Learning Group, Department of Radiation Oncology, Heidelberg University Hospital, Heidelberg, Germany