This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fundamentals in Radiology, Subject name: Radiology
In which of the following form of imaging, Harmonic imaging is related- 
Select and explain. 
A. Sonography, B. Digital radiography, C. MRCP, D. Nuclear imaging
A: Sonography
Answer: A: Sonography 
Explanation: Harmonic imaging is a newer technique in ultrasonography. Harmonic imaging exploits non-linear propagation of ultrasound through the body tissues. The high-pressure poion of the wave travels faster than low pressure resulting in distoion of the shape of the wave. This change in waveform leads to the generation of harmonics Advantages over conventional ultrasound * decreased aifacts * increased axial and lateral resolution * improved resolution in patients with large body habitus