Which of the following imaging works based on the principle of piezoelectric effect?
**Core Concept**
The piezoelectric effect is a phenomenon where certain materials generate an electric charge in response to mechanical stress, such as pressure or vibration. This property is utilized in various medical imaging modalities.
**Why the Correct Answer is Right**
Ultrasound imaging works on the principle of piezoelectric effect, where high-frequency sound waves (ultrasound) are produced by a transducer, which converts electrical energy into mechanical energy. When the sound waves encounter tissues, they are reflected back and detected by the same transducer, which converts the mechanical energy back into electrical energy. The resulting signals are then processed to create images of the internal structures. The piezoelectric crystals in the transducer are responsible for this conversion, allowing for real-time imaging.
**Why Each Wrong Option is Incorrect**
**Option A:** MRI (Magnetic Resonance Imaging) works on the principle of nuclear magnetic resonance, not piezoelectric effect. It uses magnetic fields and radio waves to generate images of the body's internal structures.
**Option B:** CT (Computed Tomography) scans use X-rays to produce images of the body's internal structures, not the piezoelectric effect.
**Option C:** PET (Positron Emission Tomography) scans use radioactive tracers to produce images of metabolic processes in the body, not the piezoelectric effect.
**Clinical Pearl / High-Yield Fact**
The piezoelectric effect is also used in other medical devices, such as pacemakers and bone growth stimulators. Understanding the underlying principle of piezoelectric effect is essential for medical professionals to appreciate the technology behind various medical imaging modalities.
**Correct Answer: C. Ultrasound imaging.