Free Computed Tomography (CT) Questions and Answers

Question 1

X-rays of the body are captured from various angles during computed tomography (CT), which produces images that resemble 2- and 3-dimensional slices (cross-sections). All jewelry and metal objects, such as zippers and belt buckles close to the body portion being scanned, should be taken off by anyone getting a CT scan. Why are patients asked to remove metal before a CT scan?

Accepted Answer

The items may block the x-rays and blur the images

Answer

Agile Methodology is characterized by its iterative and incremental approach, focusing on flexibility, collaboration, and rapid delivery. It breaks down projects into small, manageable iterations (sprints) to allow for quick progressions and faster releases of working software. This enables teams to adapt to changing requirements and deliver value continuously.

Question 2

A radiopaque contrast agent, a material that can be seen on X-rays to aid in identifying one tissue from another, may be administered to patients before a CT scan. Which of the following contrast agents is used with CT the most frequently?

Accepted Answer

Iodine

Answer

Metal objects, such as jewelry and zippers, are radiopaque, meaning they absorb X-rays. During a CT scan, these items can block the X-ray beam, creating artifacts or streaks on the images. These artifacts can obscure important anatomical structures, making it difficult for radiologists to accurately interpret the scan results and potentially leading to misdiagnosis.

Question 3

Using CT and a radiopaque contrast agent, CT angiography creates 2- and 3-dimensional pictures of blood vessels to look for anomalies. Which of the following statements most accurately describes why CT angiography is frequently employed instead of traditional angiography?

Accepted Answer

Is less invasive

Answer

Iodine-based contrast agents are the most frequently used with CT scans due to their high atomic number, which allows them to effectively absorb X-rays and enhance the visibility of blood vessels and soft tissues. They are typically administered intravenously to highlight specific structures and differentiate them from surrounding tissues. Other agents like barium are used for gastrointestinal imaging, while gadolinium is primarily for MRI.

Question 4

What kind of detector is used now that is both effective and popular?

Accepted Answer

Solid state crystalline detectors

Answer

CT angiography is frequently preferred over traditional angiography because it is a significantly less invasive procedure. Traditional angiography involves inserting a catheter directly into an artery, which carries higher risks such as bleeding, infection, and arterial damage. CT angiography, on the other hand, only requires an intravenous injection of contrast material, making it safer and more comfortable for the patient.

Question 5

What part of the CT gantry measures photons that are transmitted and pass through the patient?

Accepted Answer

Detectors

Answer

Solid state crystalline detectors, such as those made from cadmium tungstate or ceramic scintillators, are widely used in modern CT scanners. They are highly efficient at converting X-ray photons into light, which is then converted into electrical signals. Their high efficiency and fast response times contribute to improved image quality and reduced patient radiation dose.

Computed Tomography Test Practice Test

Computed Tomography Test Practice Test

Free Computed Tomography (CT) Questions and Answers