1. Which of the following is the primary concern when performing a
CT scan in pediatric patients?
A. Patient cooperation
B. Increased radiation exposure
C. Difficulty in obtaining clear images
D. Use of contrast agents
Answer: B) Increased radiation exposure
Rationale: Pediatric patients are more sensitive to radiation, and their
developing tissues are at a higher risk for radiation-induced damage.
Efforts are made to minimize radiation exposure, including using lower
doses and proper shielding.
2. What is the typical appearance of a lung with emphysema on a CT
scan?
A. Increased attenuation with white areas
B. Decreased attenuation with dark areas
C. Sharp boundary between lung and surrounding tissues
D. Nodules within the lung parenchyma
Answer: B) Decreased attenuation with dark areas
,Rationale: In emphysema, the lung tissue is destroyed, leading to areas
of decreased density, which appear dark on a CT scan due to reduced
tissue attenuation.
3. What does "pitch" refer to in helical CT scanning?
A. The speed at which the scanner rotates
B. The thickness of each slice taken during the scan
C. The ratio of table movement to slice thickness
D. The contrast material used in the scan
Answer: C) The ratio of table movement to slice thickness
Rationale: "Pitch" in helical CT refers to the table movement per slice
thickness, influencing scan speed and image quality. A higher pitch
means faster scanning but potentially lower image quality.
4. Which of the following factors has the greatest influence on the
quality of a CT image?
A. The amount of contrast used
B. The number of X-ray tubes in the scanner
C. The slice thickness and reconstruction algorithms
D. The patient's body position
Answer: C) The slice thickness and reconstruction algorithms
Rationale: The quality of CT images is highly dependent on the slice
thickness and the algorithms used for reconstruction. Thinner slices
, often provide higher image resolution, and advanced algorithms
improve clarity and detail.
5. When scanning a patient with a pacemaker, what is the most
important consideration?
A. Ensuring the patient is adequately hydrated
B. Ensuring the pacemaker does not cause image artifacts
C. Avoiding the use of contrast agents
D. Using a high-dose radiation protocol for better image clarity
Answer: B) Ensuring the pacemaker does not cause image artifacts
Rationale: Pacemakers can cause artifacts on CT images due to the
metal components. It is important to properly position the patient and
use appropriate scan parameters to minimize these artifacts.
6. Which of the following is the primary reason for performing a non-
contrast CT scan of the brain?
A. To evaluate for fractures or hemorrhage
B. To assess for tumors
C. To visualize blood vessels
D. To evaluate liver function
Answer: A) To evaluate for fractures or hemorrhage
CT scan in pediatric patients?
A. Patient cooperation
B. Increased radiation exposure
C. Difficulty in obtaining clear images
D. Use of contrast agents
Answer: B) Increased radiation exposure
Rationale: Pediatric patients are more sensitive to radiation, and their
developing tissues are at a higher risk for radiation-induced damage.
Efforts are made to minimize radiation exposure, including using lower
doses and proper shielding.
2. What is the typical appearance of a lung with emphysema on a CT
scan?
A. Increased attenuation with white areas
B. Decreased attenuation with dark areas
C. Sharp boundary between lung and surrounding tissues
D. Nodules within the lung parenchyma
Answer: B) Decreased attenuation with dark areas
,Rationale: In emphysema, the lung tissue is destroyed, leading to areas
of decreased density, which appear dark on a CT scan due to reduced
tissue attenuation.
3. What does "pitch" refer to in helical CT scanning?
A. The speed at which the scanner rotates
B. The thickness of each slice taken during the scan
C. The ratio of table movement to slice thickness
D. The contrast material used in the scan
Answer: C) The ratio of table movement to slice thickness
Rationale: "Pitch" in helical CT refers to the table movement per slice
thickness, influencing scan speed and image quality. A higher pitch
means faster scanning but potentially lower image quality.
4. Which of the following factors has the greatest influence on the
quality of a CT image?
A. The amount of contrast used
B. The number of X-ray tubes in the scanner
C. The slice thickness and reconstruction algorithms
D. The patient's body position
Answer: C) The slice thickness and reconstruction algorithms
Rationale: The quality of CT images is highly dependent on the slice
thickness and the algorithms used for reconstruction. Thinner slices
, often provide higher image resolution, and advanced algorithms
improve clarity and detail.
5. When scanning a patient with a pacemaker, what is the most
important consideration?
A. Ensuring the patient is adequately hydrated
B. Ensuring the pacemaker does not cause image artifacts
C. Avoiding the use of contrast agents
D. Using a high-dose radiation protocol for better image clarity
Answer: B) Ensuring the pacemaker does not cause image artifacts
Rationale: Pacemakers can cause artifacts on CT images due to the
metal components. It is important to properly position the patient and
use appropriate scan parameters to minimize these artifacts.
6. Which of the following is the primary reason for performing a non-
contrast CT scan of the brain?
A. To evaluate for fractures or hemorrhage
B. To assess for tumors
C. To visualize blood vessels
D. To evaluate liver function
Answer: A) To evaluate for fractures or hemorrhage
