Which applications, either for diagnostic purposes or for therapeutic purposes, involve the use of X-rays? Choose four correct answers.

CT scans, fluoroscopy, and radiography use X-rays to create diagnostic images. External beam radiation therapy can use high-energy X-rays to treat tumors. Radioisotope imaging and brachytherapy use radiation from radioactive materials, while MRI uses magnetic fields and radio waves; laser eye surgery uses lasers.

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