Michael Francois Nel on Radiopaedia.org

Michael Francois Nel

MBChB, BSC (Med) Hons

Michael is a medical doctor (MBChB, BSc (Med) Hons) from Cape Town, South Africa.

In 2023, he started Radiology Tutorials, which provides online radiology education for junior doctors and radiology trainees.

Michael has created three Radiopaedia imaging physics learning pathways.

Disclosures:
  • Nothing to disclose
95 results found
Question

Question 2934

Loss of the transverse magnetization vector over time is known as what?

Question

Question 2935

Which of the following MRI machine components has NO direct effect on the precession frequency of hydrogen atoms?

Question

Question 2936

The radiofrequency pulse is...

Question

Question 2937

Protons have a spin value of ±½. Paired protons in an atomic nucleus have a net spin value of...

Question

Question 2938

Concerning nuclear spin, which of the following is FALSE?

Question

Question 2939

What does the T2 time constant represent?

Question

Question 2940

Which of the following time constants is shortest?

Question

Question 2941

Which of the following is the primary mechanism for T1 relaxation (longitudinal recovery)?

Question

Question 2942

Which of the following will have the most T1 contrast?

Question

Question 2943

Which of the following will prolong acquisition time?

Question

Question 2944

In magnetic resonance imaging (MRI), which of the following does NOT affect slice thickness?

Question

Question 2945

In MRI imaging, which of the following contributes most to nuclear precession frequency?

Question

Question 2946

Which of the following compensates for signal loss due to magnetic field non-uniformity?

Question

Question 2947

Half Fourier imaging results in an increase in...

Question

Question 2948

The periphery of k-space stores information encoding predominantly for what?

Question

Question 2949

Which of the following will increase the receiver bandwidth?

Question

Question 2950

What effect will doubling the matrix size in the frequency encoding axis have?

Question

Question 2951

What does a reduction in receiver bandwidth cause?

Question

Question 2952

In a 1T magnetic field, what is the approximate difference in hydrogen precession frequency between water and fat? (The gyromagnetic ratio of hydrogen is 42.6 MHz/T)

Question

Question 2953

What will doubling the echo train length (ETL) in fast spin echo do?

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