Computed Tomography Test Practice Test

Computed Tomography Test Questions and Answers

A process that creates a succession of in-depth images of various body parts using an X-ray machine connected to a computer. Various angles of photographs are used to see tissues and organs in three dimensions.

The invention of CT dates to 1972.

A computed tomography scan is a type of medical imaging procedure used to produce in-depth pictures of the body’s inside.

The purpose of a CT scan of the thorax is to map out the size, shape, and location of the organs in the upper abdomen and chest. To inspect the lungs or other places for bleeding or fluid accumulations, check for chest inflammation or infection, and search for lung blood clots.

In order to create cross-sectional (slices) images inside certain body regions from different angles, CT scans—medical imaging procedures—use ionizing radiation.

A narrow X-ray beam is quickly spun around a patient’s body during a procedure known as “computed tomography,” or CT. This produces signals that are then analyzed by the machine’s computer to create cross-sectional images, or “slices,” of the patient’s body.

As of May 1st, 2026, the average compensation for a technologist performing computed tomography (CT) scans in the United States is $78,800, but the range frequently varies from $71,980 to $86,140.

While there may be a little increase in your risk of cancer at far greater levels, the modest radiation doses used in CT scans have not been proven harmful over the long term. The numerous advantages of CT scan far outweigh any minimal possible risks.

The skills required of a CT scan technologist include reading a doctor’s scanning orders correctly, giving contrast agents, setting up and using the CT scanner, and positioning the patient to get the best results.

A computerized axial tomography scan can be used to aid in the diagnosis of illness, the planning of treatment, or to assess the efficacy of that treatment.

Digital tomography Angiograms, or the imaging of arteries and veins throughout the human body, are performed using angiography computed tomography technology.

In many different parts of the body, CT scans can be used to detect disease or damage.

A medical imaging method called cone beam computed tomography uses divergent X-ray computed tomography to create a cone-shaped image. In various fields, including implant dentistry, ENT, orthopedics, and interventional radiology, CBCT has grown significantly for treatment planning and diagnosis.

A process that creates a succession of finely detailed images of locations inside the body using a computer connected to X-ray equipment that emits a very low dosage of radiation. Several angles of photography were used to construct 3-D views of tissues and organs. According to their age and smoking history, adults with a high risk of developing lung cancer are advised to undergo low-dose computed tomography as a screening test. Also known as a low-dose CT scan and LDCT.

Gamma rays are used in the nuclear medicine tomographic imaging technology known as single-photon emission computed tomography. While using a gamma camera is extremely comparable to traditional nuclear medicine planar imaging and can produce full 3D data.

It was invented by EMI Laboratories’ British engineer Godfrey Hounsfield and Tufts University’s South African-born physicist Allan Cormack.

• Determine whether you want to pursue a profession as a CT scan technician. As a CT scan technologist, your responsibilities often involve setting up and running diagnostic equipment, maintaining patient records, and arranging patients for clear CT scan images. The process must be repeated if the image needs to be clarified or clarified. You thoroughly discuss the process and address any patients’ queries before they undergo a CT scan. You are qualified to do ultrasounds and other radiology treatments since you are a certified radiologic technologist. 
• High school graduation is a prerequisite for a radiography degree program. A solid math, science, and computer science foundation will help you. Biology and psychology electives could be useful as well. 
• You have higher employment prospects if you have an associate’s degree in nuclear medicine technology, diagnostic medical sonography, or radiography. Through these classes, you can learn medical language, healthcare systems, radiology techniques, radiology gear, patient care, and anatomy. A clinical practicum is also a component of such curricula. Contact the community or technical college in your area for information on available programs.
• The American Registry of Radiologic Technologists offers voluntary certification (ARRT, www.arrt.org). Before seeking CT scan certification, you must first achieve ARRT certification in a supporting field, typically radiography, radiation therapy, or nuclear medicine technology. After receiving this initial certification from the ARRT, candidates must complete 16 credits of training in particular CT specialties and verify the supervised clinical practice. These courses can be completed in six months to a year. You can take the ARRT certification exam if you’ve met the prerequisites for clinical training.
• The U.S. Bureau of Labor Statistics reports that each state has its licensing standards. Through the American Society of Radiologic Technologists, you can learn more about the license requirements in your state.

Sample Computed Tomography Test Practice Questions

Try these questions from our free Computed Tomography Test practice tests. The correct answer and an explanation follow each question.

1. What is the name of the CT artifact that appears as concentric rings centered on the isocenter?

   • A. Beam hardening artifact
   • B. Aliasing artifact
   • C. Ring artifact
   • D. Partial volume artifact

Answer: C. Ring artifact

Ring artifacts are caused by defective or miscalibrated detector elements and manifest as circular bands centered on the gantry rotation axis.

Answer: C. Better soft tissue contrast

The fundamental principle behind Computed Tomography (CT) imaging is X-ray absorption. A CT scanner uses an X-ray tube to generate X-rays that pass through the patient's body, and detectors measure the amount of X-rays absorbed by different tissues. The varying absorption rates, based on tissue density, allow a computer to reconstruct detailed cross-sectional images.

Answer: C. The distance between adjacent slices

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.

Answer: B. Computed Tomography (CT)

Computed Tomography (CT) scans are highly effective at detecting calcifications due to their principle of measuring X-ray attenuation. Calcium has a very high density and thus strongly attenuates X-rays, appearing very bright (hyperdense) on a CT image. This makes CT superior to other imaging modalities like MRI, which often struggles to visualize calcifications clearly, for this specific purpose.

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