1. Which of the following diagnostic imaging tests uses sound waves to create images of internal body structures? A. MRI B. CT scan C. Ultrasound D. PET scan Answer: C. Ultrasound Rationale: Ultrasound utilizes sound waves to create images of internal organs and structures, making it a safe and non-invasive imaging modality. 2. What is the primary purpose of a CT scan? A. To assess blood flow in the brain B. To diagnose fractures and bone abnormalities C. To evaluate soft tissue structures in the abdomen D. To measure metabolic activity in the body Answer: B. To diagnose fractures and bone abnormalities Rationale: CT scans are an excellent tool for visualizing bone structures and detecting fractures, making them a common choice for trauma assessments. 3. Which of the following imaging modalities is best suited for assessing blood flow and evaluating cardiac function? A. MRI B. CT scan C. Echocardiography D. PET scan Answer: C. Echocardiography Rationale: Echocardiography uses sound waves to create detailed images of the heart and blood flow, making it an ideal tool for assessing cardiac function. 4. What is the primary advantage of using MRI over CT scans? A. MRI provides better images of bone structures B. MRI does not use radiation