Rad Drills

The following events take place at resonance except

• Relaxation

• Phase coherence

• Energy absorption

• All of the above

Applying a radiofrequency (RF) pulse at the same frequency as the precessing hydrogen nuclei, and at 90° to B0 induces _____________

• MR Signal

• Phase Recovery

• Resonance

• Rephrasing pulse

At Resonance, the hydrogen nuclei resonate whereas other MR active nuclei do not resonate because

• they are more abundant than the hydrogen nuclei

• they belong to the spin-up nuclei

• they have frequency higher than that of the resonance

• their gyromagnetic ratios are different from that of hydrogen.

Which of the following best describes the radiographic appearance of pulmonary edema?

• Hyperinflated lungs with flattened diaphragm

• Patchy alveolar opacities in a bat-wing distribution

• Hilar lymphadenopathy and widened mediastinum

• Bilateral ground-glass opacities with honeycombing

• Single large cavitating lesion in the upper lobe

Which pathology is most commonly associated with the “double bubble” sign on abdominal radiography of a neonate?

• Hirschsprung disease

• Pyloric stenosis

• Duodenal atresia

• Meconium ileus

• Volvulus

In a modern digital radiography system, which of the following statements best describes the role of the thin-film transistor (TFT) array in a flat panel detector?

• It amplifies the x-ray signal and transmits it directly to the image processor

• It acts as the scintillator layer, converting x-rays to visible light

• It stores the electrical charge generated by the photodiode array and sequentially transmits it for image formation

• It directly converts x-ray photons into electrons for immediate digital readout

• It filters low-energy x-rays to enhance spatial resolution

Which event was triggered by a massive earthquake?

• The Chernobyl disaster

• Hiroshima and Nagasaki bombings

• Fukushima nuclear disaster

• Three Mile Island incident

When inspecting an x-ray image, the order of densities from blackest to whitest is:

• Bone, water, fat, air

• Air, fat, water, bone

• Air, water, fat, bone

• Bone, air, water, fat

The indication for a ball catchers projection is:

• Carpal tunnel syndrome

• Rheumatoid arthritis

• Rickets

• Trauma

The following makes theatre radiography very challenging except

• The need for high accuracy

• Observing strict theatre environment protocols

• The need for speed

• patient condition