Certified Healthcare Constructor (CHC) Practice Exam

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What type of radiation is used in a positron emission tomography (PET) scan for imaging?

X-rays
Ultrasound waves
Intravenous radioactive materials
Magnetic resonance imaging

The correct answer is: Intravenous radioactive materials

In a positron emission tomography (PET) scan, intravenous radioactive materials are used as a key component in the imaging process. This method involves the injection of a radiotracer—a small amount of radioactive material that emits positrons. As the radiotracer accumulates in specific tissues, it allows for the detection of gamma rays produced when the positrons collide with electrons in the body. This imaging technique is particularly valuable for observing metabolic processes and can help detect diseases, including cancer, by highlighting areas of increased metabolic activity. The other choices are not applicable in the context of PET scans. X-rays are associated with different imaging modalities, primarily used in computed tomography (CT) scans. Ultrasound waves utilize sound waves for imaging and are commonly used for soft tissue evaluation but do not apply to PET technology. Magnetic resonance imaging (MRI) employs strong magnetic fields and radio waves for imaging and is distinct from the radioactive techniques utilized in PET scans. Each of these alternative methods serves different purposes and relies on different principles of physics and biology, affirming the unique role of intravenous radioactive materials in PET imaging.