EchoDx Hub

16/04/2026

16/04/2026

🫀 EchoDx Hub | MCQ #

Q. Which of the following will increase the PRF?

A. Reducing depth
B. Decreasing transducer frequency
C. Reducing sector angle
D. Reducing filter

✅ Correct Answer: A. Reducing depth

📖 Explanation:
Pulse Repetition Frequency (PRF) is primarily determined by the depth of imaging.

🔹 Formula:
PRF = c / (2 × depth)

🔹 Reducing depth → shorter travel time → more pulses per second → increased PRF

🔹 Other options:
• Decreasing transducer frequency → ❌ no direct effect on PRF
• Reducing sector angle → ❌ increases frame rate, not PRF
• Reducing filter → ❌ affects Doppler signal processing, not PRF

👉 Key Concept:
Shallow depth = high PRF = higher Nyquist limit → less aliasing

16/04/2026

🫀 ASD Closure – Before vs After | TTE

Atrial Septal Defect (ASD) allows abnormal blood flow between the atria, leading to right heart volume overload.

🔴 Before Closure:
Color Doppler shows clear left-to-right shunt across the interatrial septum.

🟢 After Device Closure:
Septal occluder device in place with no residual shunt – a successful outcome ✔️

🎯 Key Echo Checks:
• Device position
• Residual flow
• RA/RV size

Early diagnosis + timely intervention = better cardiac outcomes ❤️

10/04/2026

🫀 Tests to Rule Out Heart Disease

Not every symptom means heart disease — but ruling it out early can save lives.

✔ ECG – Quick initial screening
✔ 2D Echo – Structure & function
✔ Troponin – Detects myocardial injury
✔ Stress Test – Unmasks ischemia
✔ CT Angio – Non-invasive coronary imaging
✔ Coronary Angio – Gold standard

🔍 No single test is enough — always correlate clinically.

❤️ Early testing = Early diagnosis = Better outcomes

🔖 Hashtags:

10/04/2026

🫀 EchoDx Hub | MCQ #

Q. Duty factor increases with:

A. Increasing gain
B. Increasing pulse duration
C. Decreasing pulse repetition frequency (PRF)
D. Decreasing dynamic range

✅ Correct Answer: B. Increasing pulse duration

📖 Explanation:
Duty factor is the fraction of time the transducer is transmitting ultrasound.

🔹 Formula:
Duty Factor = Pulse Duration / Pulse Repetition Period

🔹 Increasing pulse duration → more time transmitting → higher duty factor

🔹 Other options:
• Increasing gain → ❌ affects image brightness, not duty factor
• Decreasing PRF → ❌ increases repetition period → actually reduces duty factor
• Decreasing dynamic range → ❌ affects contrast resolution

👉 Key Concept:
Longer pulse duration = higher duty factor = more energy delivered