Which of the following are common types of imaging studies?

The correct answer highlights common types of imaging studies like X-rays and MRI scans. X-rays are one of the oldest and most commonly used imaging techniques, utilizing ionizing radiation to create images of the bones and certain tissues to diagnose fractures, infections, and various conditions. MRI (Magnetic Resonance Imaging), on the other hand, uses strong magnetic fields and radio waves to produce detailed images of organs and tissues, particularly useful for soft tissue evaluation such as the brain, muscles, and ligaments.

In contrast, the other choices contain diagnostic procedures that do not primarily focus on imaging. Blood tests and urinalysis are laboratory tests that analyze bodily fluids to assess health or diagnose conditions but do not provide visual imaging. A biopsy involves the extraction of tissue samples for microscopic examination, and endoscopy is a procedure that allows direct visual examination of organs using a flexible tube, rather than producing imaging studies. CT scans and PET scans are indeed imaging studies, but the most common introductory examples are X-rays and MRIs, making the first choice the best representative answer regarding common imaging studies.