Computed Tomography Exam Review
(Mosby's Third Edition) - Exam 1 ( Updated
2025-2026 ) 1-100 Complete Questions &
Answers (Solved) With Rationales 100%
Correct Graded A+
An average range for activated partial thromboplastin time
(PTT) is:
a. 10-12 sec
b. 17-21 sec
c. 25-35 sec
d. 43-55 sec
- Ans:
- c. 25-35 sec
Rationale: - The partial thromboplastin time (PTT) is a
laboratory measure of blood coagulation. This value is
used to screen patients for invasive procedures. Because
of individual laboratory practices, the average range may
fluctuate slightly.
,Which of the following is the correct angle of insertion for
placing a butterfly needle into a vein for intravenous
administration of a contrast agent?
a. 5˚
b. 15˚
c. 45˚
d. 60˚
- Ans:
- b. 15˚
Rationale: - A butterfly needle should be inserted at an
angle of 15 degrees for the intravenous administration of
contrast material. It is also important that the vein be
properly stabilized and that the needle be inserted gently
with the bevel facing up.
A total volume of 125 mL of an iodinated contrast agent is
administered intravenously via automatic injector in 50
seconds. The flow rate for this injection is:
a. 0.74 mL/sec
b. 1.25 mL/sec
c. 1.75 mL/sec
d. 2.5 mL/sec
- Ans:
,- d. 2.5 mL/sec
Rationale: - The flow rate may be calculated by dividing
the total contrast volume by the time of the injection. In
this example, the total contrast volume is 125 mL and the
time for the injection is 50 seconds. The flow rate
programmed for this injection would be 125/50, or 2.5 mL
per second.
The condition whereby the patient suffers from a low
concentration of oxygen in the blood is called:
a. hypoxemia
b. hypotension
c. hypoxia
d. hyponatremia
- Ans:
- a. hypoxemia
Rationale: - Hypoxemia refers to a condition whereby the
patient suffers from a low concentration of oxygen in the
blood. Hypoxia describes insufficient oxygenation of
tissue at the cellular level. Hypotension refers to the
condition of low blood pressure. Hyponatremia describes
the condition of low sodium levels in the blood.
, While one is obtaining a thorough history from a patient
before the intravenous injection of an iodinated contrast
material, which of the following topics should be included?
1. any prior allergic reactions to contrast
2. presence of HIV or hepatitis infection
3. history of asthma
a. 1 only
b. 1 & 2 only
c. 1 & 3 only
d. 1, 2 & 3
- Ans:
- c. 1 & 3 only
Rationale: - Prior reactions to contrast and a history of
asthma are factors that increase the incidence of adverse
reaction to iodinated contrast media. It is therefore vital
to question the patient regarding these factors before
contrast agent administration. The presence of the
human immunodeficiency virus (HIV) or hepatitis does not
increase the incidence of adverse reaction to iodinated
contrast media. Because universal precautions govern the
protection of all patients and health care professionals,
there is no need to question the patient regarding these
factors.
(Mosby's Third Edition) - Exam 1 ( Updated
2025-2026 ) 1-100 Complete Questions &
Answers (Solved) With Rationales 100%
Correct Graded A+
An average range for activated partial thromboplastin time
(PTT) is:
a. 10-12 sec
b. 17-21 sec
c. 25-35 sec
d. 43-55 sec
- Ans:
- c. 25-35 sec
Rationale: - The partial thromboplastin time (PTT) is a
laboratory measure of blood coagulation. This value is
used to screen patients for invasive procedures. Because
of individual laboratory practices, the average range may
fluctuate slightly.
,Which of the following is the correct angle of insertion for
placing a butterfly needle into a vein for intravenous
administration of a contrast agent?
a. 5˚
b. 15˚
c. 45˚
d. 60˚
- Ans:
- b. 15˚
Rationale: - A butterfly needle should be inserted at an
angle of 15 degrees for the intravenous administration of
contrast material. It is also important that the vein be
properly stabilized and that the needle be inserted gently
with the bevel facing up.
A total volume of 125 mL of an iodinated contrast agent is
administered intravenously via automatic injector in 50
seconds. The flow rate for this injection is:
a. 0.74 mL/sec
b. 1.25 mL/sec
c. 1.75 mL/sec
d. 2.5 mL/sec
- Ans:
,- d. 2.5 mL/sec
Rationale: - The flow rate may be calculated by dividing
the total contrast volume by the time of the injection. In
this example, the total contrast volume is 125 mL and the
time for the injection is 50 seconds. The flow rate
programmed for this injection would be 125/50, or 2.5 mL
per second.
The condition whereby the patient suffers from a low
concentration of oxygen in the blood is called:
a. hypoxemia
b. hypotension
c. hypoxia
d. hyponatremia
- Ans:
- a. hypoxemia
Rationale: - Hypoxemia refers to a condition whereby the
patient suffers from a low concentration of oxygen in the
blood. Hypoxia describes insufficient oxygenation of
tissue at the cellular level. Hypotension refers to the
condition of low blood pressure. Hyponatremia describes
the condition of low sodium levels in the blood.
, While one is obtaining a thorough history from a patient
before the intravenous injection of an iodinated contrast
material, which of the following topics should be included?
1. any prior allergic reactions to contrast
2. presence of HIV or hepatitis infection
3. history of asthma
a. 1 only
b. 1 & 2 only
c. 1 & 3 only
d. 1, 2 & 3
- Ans:
- c. 1 & 3 only
Rationale: - Prior reactions to contrast and a history of
asthma are factors that increase the incidence of adverse
reaction to iodinated contrast media. It is therefore vital
to question the patient regarding these factors before
contrast agent administration. The presence of the
human immunodeficiency virus (HIV) or hepatitis does not
increase the incidence of adverse reaction to iodinated
contrast media. Because universal precautions govern the
protection of all patients and health care professionals,
there is no need to question the patient regarding these
factors.
