The Heart: Part 1 (Pretest)

12 Questions | Total Attempts: 74

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Heart Quizzes & Trivia

In humans and other mammals and in birds, the heart is a four-chambered double pump that is the center of the circulatory system. The heart is essentially a muscle and like any other muscle in the human body, it contracts and expands. Take the pretest below on the heart and get to learn more.


Questions and Answers
  • 1. 
    Which of the following organs generally receives the greatest radiation dose during Cardiac CT?
    • A. 

      Stomach

    • B. 

      Breast

    • C. 

      Heart

    • D. 

      Esophagus

  • 2. 
    Which of the following options will lead to the greatest reduction in radiations exposure to the patient?
    • A. 

      Decreasing peak tube voltage from 120 to 100 kVp

    • B. 

      Decreasing tube current from 500 to 400 mAs

    • C. 

      Increasing collimation from 64 x 0.5 to 32 x 1mm

    • D. 

      Decreasing pitch from 0.3 to 0.2

  • 3. 
    Which of the following should be considered in preparation for a cardiac CT scan to assess for anomalous coronary artery origin in a 32 year woman with a heart rate of 86 bpm despite beta-blocker administration?
    • A. 

      Increase pitch from 0.2 to 0.4

    • B. 

      Prospective ECG-triggering instead of retrospective ECG-gating

    • C. 

      Dual source CT and retrospective ECG-gating

    • D. 

      MRI examination

  • 4. 
    A major reason why thin collimation and thin slice reconstruction are required for coronary CTA is to:
    • A. 

      Increase scan coverage

    • B. 

      Minimize radiation dose

    • C. 

      Obtain adequate temporal resolution

    • D. 

      Achieve high z-axis resolution and avoid volume averaging

  • 5. 
    Which of the following factors does not influence the number of photons which contribute to a reconstructed slice?
    • A. 

      Tube current

    • B. 

      Scan time

    • C. 

      Reconstructed slice width

    • D. 

      Reconstruction kernel

  • 6. 
    Regarding data acquisition in axial (prospective) and helical (retrospective) scanning modes, which of the following statements is correct?
    • A. 

      In axial scanning mode, each detector row is dedicated to one z-axis slice per gantry rotation

    • B. 

      In axial scanning mode, each detector row is dedicated to multiple z-axis slice levels per gantry rotation

    • C. 

      In helical scanning mode, each detector row is dedicated to one z-axis slice level per gantry rotation

    • D. 

      Each detector row is always dedicated to one z-axis slice level per gantry rotation, in either axial or helical scanning mode.

  • 7. 
    A patient taking sildenafil (Viagra) for erectile dysfunction took the medication two days ago. He presents for a cardiac CTA for atypical chest pain, what is the most appropriate action?
    • A. 

      Proceed with scan without sublingual nitroglycerin

    • B. 

      Proceed with the scan with sublingual nitroglycerin

    • C. 

      Reschedule his test for next day

    • D. 

      Consider alternate testing

  • 8. 
    A 44 year-old man with chest pain and equivocal stress ECG test arrives for Cardiac CTA. His Calcium score is 400. The patient has a history of bronchospasm and daily use of bronchodilator. His heart rate at check-in is 88 bpm. How do you proceed?
    • A. 

      Perform scan without beta-blocker using retrospective gating

    • B. 

      Use a short-acting IV metoprolol immediately prior to scan

    • C. 

      Use a long-acting oral metoprolol one hour before the scan

    • D. 

      Cancel the study and consider alternative diagnostic test

  • 9. 
    Studies have shown the diagnostic accuracy of coronary CTA is decreased in patients with:
    • A. 

      Tachycardia

    • B. 

      BMI >30kg/m2

    • C. 

      Calcium score >400

    • D. 

      All of the above

  • 10. 
    For which patient would coronary CTA NOT be appropriate?
    • A. 

      Patients admitted for a ST elevation MI and have positive Troponin

    • B. 

      Patients with borderiine or equivocal positive stress tests

    • C. 

      Patient with atypical chest pain, a LBBB of unknown duration, with normal serial cardiac enzymes

    • D. 

      Patients who are admitted to rule out MI, with negative biomarkers (negative Troponin)

  • 11. 
    An advantage of performing a coronary CT angiogram with retrospectively ECG-gated CT compared to prospective ECG-triggered CT includes all EXCEPT:
    • A. 

      The ability to reconstruct overlapping slices for increased z-axis resolution.

    • B. 

      Considerably less radiation exposure.

    • C. 

      Ability to calculate ejection fraction.

    • D. 

      Arrhythmias are less likely to cause image artifacts.

  • 12. 
    When performing a "triple rule out" protocol, the simultaneous opacification of the coronary arteries, thoracic aorta, and pulmonary arteries requires which of the following?
    • A. 

      Faster contrast injection

    • B. 

      Larger contrast volume

    • C. 

      Higher tube current

    • D. 

      Thinner slice collimation

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