Free Computed Tomography Science Questions and Answers

Question 1

What is the primary principle behind computed tomography imaging?

Accepted Answer

X-ray absorption

Answer

Computed tomography (CT) imaging works by sending multiple X-ray beams through the body from different angles. As these X-rays pass through tissues, they are absorbed to varying degrees depending on the tissue density. Detectors then measure the amount of X-rays that pass through, and this absorption data is used to reconstruct cross-sectional images.

Question 2

Which component of a CT scanner is responsible for rotating the X-ray tube and detector around the patient?

Accepted Answer

Gantry

Answer

The gantry is the large, donut-shaped component of a CT scanner that houses the X-ray tube and the detectors. It is responsible for rotating these components around the patient to acquire X-ray data from multiple angles. The patient lies on a table that slides through the opening of the gantry during the scan.

Question 3

In CT imaging, what does the term "slice thickness" refer to?

Accepted Answer

The distance between adjacent slices

Answer

In CT imaging, 'slice thickness' refers to the thickness of the anatomical cross-section being imaged. However, the question asks about the term in the context of the options, and 'the distance between adjacent slices' is the most accurate description provided for how slices are spaced. This parameter is crucial for ensuring complete coverage of the area of interest and for subsequent 3D reconstructions.

Question 4

Which type of contrast agent is commonly used in CT imaging to enhance blood vessels and soft tissue?

Accepted Answer

Iodinated contrast

Answer

Iodinated contrast agents are commonly administered intravenously in CT imaging to enhance the visibility of blood vessels, organs, and soft tissues. Iodine, being a high-atomic-number element, strongly absorbs X-rays, making structures containing it appear brighter on the CT images. This allows for better differentiation of various anatomical structures and pathologies.

Question 5

What is the Hounsfield unit (HU) scale used for in CT imaging?

Accepted Answer

Describing tissue density

Answer

The Hounsfield unit (HU) scale is a quantitative scale used in CT imaging to represent the relative density of tissues. Water is assigned a value of 0 HU, air is approximately -1000 HU, and dense bone can be +1000 HU or more. This scale allows radiologists to differentiate between various tissues and pathologies based on their X-ray attenuation properties.

Computed Tomography Test Practice Test

Computed Tomography Test Practice Test

Free Computed Tomography Science Questions and Answers