The Heart: Part 1 (Pretest)
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.
- 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
Questions: 12 | Attempts: 84385 | Last updated: Sep 15, 2021
-
Sample QuestionWhat do you like to eat the most?
Questions: 12 | Attempts: 77001 | Last updated: Sep 13, 2021
Questions: 15 | Attempts: 21386 | Last updated: Apr 14, 2021
Back to top