A radiologist is a medical doctor who specializes in diagnosing and treating diseases using medical imaging techniques. These techniques include X-rays, CT scans, MRI scans, and ultrasound. Radiologists interpret the images produced by these technologies to identify conditions such as fractures, tumors, and infections. In addition to diagnosis, radiologists may also perform certain procedures, such as biopsies or image-guided treatments. They work closely with other healthcare professionals, including primary care physicians and surgeons, to provide comprehensive patient care. Their expertise is crucial in guiding treatment decisions and monitoring the progress of various medical conditions.