Applications of Ultrasound – Long Answer Questions

Medium Level (Application & Explanation)

Answer:

Ultrasonography sends ultrasound waves into the body using a transducer.
These waves reflect from organs and the fetus and return as echoes.
A computer converts the echoes into real-time images on a screen.
It is non-invasive, so there are no cuts or injections needed.
It does not use ionizing radiation like X-rays, so it is safer for the mother and baby.
Doctors can check heartbeat, growth, and position, and look for abnormalities.
A coupling gel is used to remove air between skin and probe for clear images.

Answer:

Ultrasonic cleaning uses high-frequency sound waves in a liquid.
The waves create tiny bubbles that form and collapse. This process is called cavitation.
Collapsing bubbles produce minute jets that dislodge dirt from surfaces.
It reaches tiny gaps, holes, and intricate designs that brushes cannot reach.
It uses mild solutions, so it reduces the need for harsh chemicals.
It is safe for jewelry, lenses, and surgical tools when used with proper settings.
Time, power, and the right solution are adjusted to avoid damage to soft materials.

Answer:

This method is called Non-Destructive Testing (NDT) with ultrasound.
A probe sends sound waves into the metal or weld.
If there is a crack or void, part of the wave reflects back earlier.
The time taken by the echo tells the depth of the defect.
Since sound waves do not cut or heat the metal, the test is safe for the object.
It helps in quality control in construction, aerospace, and manufacturing.
It prevents failures by catching flaws before they cause accidents.

Answer:

Bats emit ultrasound pulses that are above 20 kHz.
The sound hits objects and returns as echoes to the bat’s ears.
From the echo time and loudness, bats judge distance and size.
They can hunt insects and navigate in complete darkness.
Ultrasound has short wavelengths, so it detects small objects well.
Similar skills are used by dolphins and porpoises for communication and navigation.
This ability helps in survival, avoiding obstacles, and finding food.

Answer:

Lithotripsy is a non-invasive method to break kidney stones into small pieces.
Ultrasound waves are focused on the stone to deliver high energy.
The repeated pulses cause the stone to crack and fragment.
The smaller pieces pass out through the urinary tract more easily.
It avoids surgery, reduces pain, and shortens recovery time.
Doctors choose settings to protect surrounding tissues from harm.
Patients may be advised hydration and rest after the procedure.

Answer:

Ultrasound is non-invasive and uses sound waves, not ionizing radiation.
X-rays/CT use ionizing radiation, which may pose risk to the fetus.
Ultrasound provides real-time views of the fetus and organs.
It helps assess heartbeat, growth, and placenta without harm.
It may be limited when gas or bone blocks sound, but it is still the first choice.
For safety and adequate diagnosis, doctors usually prefer ultrasound for pregnancy.
Other scans are used only if essential and with strict precautions.

Answer:

The probe may have had poor coupling; without gel, air gaps block sound.
The frequency may be too high, causing more attenuation in thick steel.
The beam angle might be wrong, so echoes from the crack did not return.
Surface roughness or scale may have scattered the waves.
Using a lower frequency, proper angle probes, and better surface prep can help.
Multiple scans from different sides and calibration blocks improve detection.
Recording time-of-flight and echo amplitude helps estimate depth and size.

Answer:

Use ultrasound therapy to promote blood flow and reduce inflammation.
Choose pulsed mode for acute pain; use continuous only for chronic tightness.
Keep the intensity and duration within safe limits advised by protocols.
Move the transducer slowly to avoid hot spots and discomfort.
Avoid areas with open wounds, metal implants, or bone growth plates.
Combine with rest, ice/heat, and physiotherapy for faster recovery.
Monitor feedback; stop if the athlete feels pain or unusual heat.

Answer:

Ultrasonic cleaning is safe for metals and hard stones like diamonds.
Porous or soft gems (like pearls, opals, emeralds) can be damaged.
Adhesive-set stones may loosen due to cavitation.
Use lower power, shorter time, and the right solution for delicate items.
Clean pearls and soft gems by hand with mild soap and cloth.
Inspect settings and mounts before and after cleaning to prevent loss.
Separate items to avoid scratches and collisions in the tank.

Answer:

Insufficient gel can leave air gaps that block sound.
Wrong frequency choice: high frequency gives detail but poor depth; low frequency penetrates deeper with less detail.
Patient movement causes blur; ask for stillness and use faster frame rates.
Gas in the gut and bone can block waves; change position or scan window.
Obesity increases attenuation; choose lower frequency and optimize gain.
Check probe for damage and ensure correct preset for the organ scanned.
Adjust focus, depth, and time-gain compensation (TGC) for clearer echoes.