Spot the Difference: Can ChatGPT4-Vision Transform Radiology Artificial Intelligence?

OpenAIs flagship Large Language Model ChatGPT can now accept image input (GPT4V). "Spot the Difference" and "Medical" have been suggested as emerging applications. The interpretation of medical images is a dynamic process not a static task. Diagnosis and treatment of Multiple Sclerosis is dependent on identification of radiologic change. We aimed to compare the zero-shot performance of GPT4V to a trained U-Net and Vision Transformer (ViT) for the identification of progression of MS on MRI. 170 patients were included. 100 unseen paired images were randomly used for testing. Both U-Net and ViT had 94% accuracy while GPT4V had 85%. GPT4V gave overly cautious non-answers in 6 cases. GPT4V had a precision, recall and F1 score of 0.896, 0.915, 0.905 compared to 1.0, 0.88 and 0.936 for U-Net and 0.94, 0.94, 0.94 for ViT. The impressive performance compared to trained models and a no-code drag and drop interface suggest GPT4V has the potential to disrupt AI radiology research. However misclassified cases, hallucinations and overly cautious non-answers confirm that it is not ready for clinical use. GPT4Vs widespread availability and relatively high error rate highlight the need for caution and education for lay-users, especially those with limited access to expert healthcare. Key pointsO_LIEven without fine tuning and without the need for prior coding experience or additional hardware, GPT4V can perform a zero-shot radiologic change detection task with reasonable accuracy. C_LIO_LIWe find GPT4V does not match the performance of established state of the art computer vision models. GPT4Vs performance metrics are more similar to the vision transformers than the convolutional neural networks, giving some possible insight into its underlying architecture. C_LIO_LIThis is an exploratory experimental study and GPT4V is not intended for use as a medical device. C_LI Summary statementGPT4V can identify radiologic progression of Multiple Sclerosis in a simplified experimental setting. However GPT4V is not a medical device and its widespread availability and relatively high error rate highlight the need for caution and education for lay-users, especially those with limited access to expert healthcare.