character: Dr. Chen
topic: Ultrasound Imaging and Its Uses
grade: 9
subject: Physics
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character: Dr. Smith
topic: The Principles of Sound Waves in Medicine
grade: 9
subject: Physics
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character: Professor Lee
topic: Applications of Physics in Medical Imaging
grade: 9
subject: Physics
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character: Ms. Johnson
topic: Understanding Wave Properties: Sound and Ultrasound
grade: 9
subject: Physics
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