Update README.md

README.md

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 # EchoVLM Ultrasound Anonymization Tool
 This repository provides an ultrasound image anonymization toolkit built based on **YOLOv11**.
 It acts as the official supporting preprocessing tool for **[EchoVLM](https://huggingface.co/chaoyinshe/EchoVLM_V2_lingshu_base_7b_instruct_preview)** and **[EchoVLM-Thyroid-9B](https://huggingface.co/chaoyinshe/EchoVLM-Thyroid-9B)**.
-The tool automatically detects and obscures sensitive text labels, patient identifiers and identifiable markers on thyroid ultrasound images to meet medical data privacy compliance requirements.
+The tool automatically detects and obscures sensitive text labels, patient identifiers and identifiable markers on ultrasound images to meet medical data privacy compliance requirements.
 
 ## Environment Requirements
 ```bash