Q.24
What is a limitation of ultrasonography?
- Acoustic Impedance in Diagnostic Ultrasound:
- Diagnostic ultrasonography utilizes high-frequency sound waves ($2 - 15\text{ MHz}$) that travel efficiently through homogeneous soft tissues and fluids.
- Major Physical Limitations:
- Gas: The acoustic impedance mismatch between soft tissue and gas is nearly $99.9\%$, causing total reflection and reverberation artifacts, rendering gas-filled lungs and intestines impermeable to ultrasound.
- Bone / Mineralized Tissue: Bone strongly absorbs and reflects ultrasound beams, producing an acoustic shadow that obscures all underlying distal architecture.
- nalysis:
- (Its unable to penetrate gas-filled or bony structures): Correct primary limitation.
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