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What are reasons why IV contrast is administered during CT evaluation of the pelvis? 1. distention and contrast enhancement of the bladder 2. visualization of the rectosigmoid junction 3. differentiation of blood vessels and pelvic lymph nodes correct answers distention and contrast enhancement ...

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  • March 2, 2025
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CT boards practice test (Mosby) || All Questions Answered
Correctly.
What are reasons why IV contrast is administered during CT evaluation of the pelvis?
1. distention and contrast enhancement of the bladder
2. visualization of the rectosigmoid junction
3. differentiation of blood vessels and pelvic lymph nodes correct answers distention and contrast
enhancement of the bladder and differentiation fo blood vessels and pelvic lymph nodes

A straight line appearing vertically on the scanogram (pilot) of a fourth-generation CT scanner is
an artifact most likely caused by what? correct answers detector malfunction

The viscosity of a contrast material may be decreased through: correct answers increases in
temperature

severe reactions to intravenous iodinated contrast material occurs in approximately ______ of all
patients correct answers less than 1%

the _________ gland is located in the anterosuperior portion of the mediastinum and is often
identified with CT during scanning of younger patients. correct answers thymus

The types of detectors used in computed tomography are:
1. gas ionization
2. stimulable phosphor
3. scintillation correct answers gas ionization and scintillation

Dysphagia: correct answers Difficulty swallowing

How should a site be prepared with an antiseptic for an invasive procedure? correct answers
Paint the area with antiseptic in a circular motion, beginning at the center and working outward.

What is the term used to describe the ability of a PACS to transmit data from the imaging facility
to an off-site location? correct answers teleradiology

After initiation of rapid bolus administration of an iodinated contrast agent, the equilibrium
phase of hepatic contrast enhancement occurs at approximately: correct answers 120-180
seconds

The purpose of intravenous contrast agent administration during a CT study is to:
1. increase the contrast between adjacent structures
2. increase the overall image density
3. increase beam attenuation of enhanced structures correct answers increase the contrast
between adjacent structures and increase beam attenuation of enhanced structures

,During CT perfusion studies, the measured time (seconds) required for blood to pass through an
area of brain tissue is termed the: correct answers Mean transit time (MTT)

What austrian mathematician proved in 1917 that it was possible to reconstruct a three-
dimensional object from the infinite set of all of its projections? correct answers Radon

Where can the matrix size, algorithm type and section thickness be found on an image? correct
answers peripheral portion

What is the muscular contraction responsible for transporting material through the digestive tract
called? correct answers peristalsis

Coronal imaging through the paranasal sinuses is typically performed with the plane of imaging:
correct answers perpendicular to the hard palate

Cardiac CT images are typically acquired during which phase of the heart's cycle? correct
answers diastolic phase (period of relaxation)

What window setting would optimal display CT colonography images? correct answers level= -
400, width= 1600

The normal range of cerebral blood volume (CBV) contained within 100g of brain tissue is:
correct answers 4-5mL/100 g

During a CT scan, each sample of ray sum measurements made by the data acquisition system
(DAS) is called a: correct answers view

Parenteral contrast administration refers to what? correct answers intravenous administration

What quality control test should be performed daily on a CT scanner? correct answers CT
number calibration and Examine noise levels (standard deviation) of a water phantom)

The condition whereby a portion of the small intestine collapses or telescopes into itself is
termed: correct answers intussusception

What is the difference between ionic and nonionic iodinated contrast media? correct answers
nonionic contrast media have a lower osmolality than ionic media

What corresponds to the longitudinal dimension of the CT image voxel? correct answers z-axis

What is the azimuth setting? correct answers the relationship between the x-ray tube and
detectors during scout or localizer production

What is the medical term for vomit? correct answers emesis

What is the normal pulse rate range for a child? correct answers 70-120bpm

,What technical factor adjustment will result in a reduction in patient radiation dose? correct
answers Reduce mAs

What is the appropriate scan delay for a CTA exam with a contrast rate of at least 4mL/sec of the
mesenteric vasclature would be in the range of: correct answers 20-30 seconds

What are the sizes of butterfly needles in decreasing order in terms of bore dimension? correct
answers 19 gauge, 21 gauge, 23 gauge

What is the display FOV used for a 320^2 matrix image with a pixel dimension of 0.75 mm x
0.75 mm? correct answers 24cm

Each 1.0% in contrast between adjacent objects amounts to a difference in pixel value of
approximately: correct answers 10 HU

What is the best method of reducing the risk of contrast-induced nephrotoxicity (CIN)? correct
answers adequate patient hydration

Following a CTA of the chest for pulmonary embolism, an additional acquisition may be
performed through the lower extremities to evaluate for: correct answers deep vein thrombosis

The plasma half-life of intravenously administered iodinated contrast material is approximately:
correct answers 2 hours

A solitary pulmonary nodule can be assumed benign when its average density is within which of
the following ranges? correct answers 165-200 HU

How can pixel dimension be calculated? correct answers dividing the DFOV by the matrix size
and multiplying it by the length of the voxel.

What unit is used to quantify effective dose? correct answers sieverts (Sv)

The majority of pancreatic tumors occur in the pancreatic: correct answers head

Where is the Data Acquisition System (DAS) located correct answers Between the detector and
the computer

The technique that provides detail of outer portions of the 3D model while maintaining the
typical CT detail of the lungs inside is called: correct answers surface rendering

What are examples of mild adverse reactions to iodinated contrast? correct answers nausea,
warm/flushed sensation, uriticaria

Abnormal accumulation of fluid around a testicle: correct answers hydrocele

, pixel correct answers a picture element

During a CT-guided needle biopsy, the insertion site is usually anesthetized with: correct
answers lidocaine

What term(s) is/are used to describe a CT scanner's ability to differentiate objects with similar
linear attenuation coefficients? correct answers sensitivity and contrast resolution

What technical attributes enables MDCT systems to acquire motion-free images of the heart and
surrounding vasculature? correct answers superior temporal resolution

The detectors of a PET system absorb and measure what type of radiation? correct answers
annihilation photons

What scan parameters should be used for a 3D disarticulation study of the hip? correct answers 1
to 2mm section width and overlapping sections

HRCT exams of the temporal bones and IAC should include what technical parameters? correct
answers thin sections (1-2mm), small targeted DFOV, and use of high-resolution algorithm
(kernel) for reconstruction

The tortuous S-shaped portion of the internal carotid artery as it enters the bony skull may be
referred to as the carotid: correct answers siphon

Differentiation between the duodenum and the head of the pancreas is best accomplished with:
correct answers oral contrast given 30-45minutes before scan and placing patient in right lateral
decubitis position before scanning.

The period of peak enhancement of the renal cortex following rapid bolus injection of an
iodinated contrast is termed: correct answers corticomedullary phase

What laboratory values is used to measure the coagulation ability of a patient prior to an invasive
CT study? correct answers PTT and PT

What is a suitable range for contrast agent volume for a intrathecal injection during a
postmyelogram CT examination of the lumbar spine in an adult patient? correct answers 12-
14mL

In a female patient, honadal shielding may be applied during which CT exams?
1. chest
2. abdomen
3. brain correct answers chest, abdomen and brain

Compression of the spinal cord or nerve roots from a herniated intervertebral disc may result in
the referred limb pain commonly referred to as: correct answers sciatica

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