18 Questions
Why does radiographic film fail to adequately demonstrate slight differences in subject contrast?
The film-screen combinations used today can only discriminate x-ray intensity differences of 5% to 10%.
What is a limitation of both radiography and tomography in terms of tissue contrast?
They are unable to adequately demonstrate slight differences in subject contrast.
What problem arises from the open geometry of the x-ray beam in tomography?
Degradation of image contrast due to scattered radiation.
How can digital imaging modalities like CT overcome the limitations of traditional film-based imaging?
By allowing alteration of contrast through digital postprocessing techniques.
What is a key advantage of CT scans over traditional radiography and tomography?
Ability to alter contrast after image acquisition.
How do radiography and tomography ensure that only the desired section of the patient is imaged?
By moving the x-ray tube and film simultaneously and in opposite directions.
What is the major shortcoming of film-based radiography?
Super-imposition of all structures on the film
What is another term for Computed Tomography (CT)?
Computerized axial tomography (CAT)
What does the term 'tomography' mean?
A cut, a slice, or a section
In what manner do Computed Tomography (CT) images produce results?
Cross-sectional images
What issues arise when structures differ only slightly in density in radiography?
Difficulty in distinguishing details
Which term describes the difficulty and sometimes impossibility in distinguishing a particular detail in radiography?
Super-imposition of structures
Which of the following is NOT an advantage of computed tomography (CT) over conventional radiography?
CT exposes the patient to a lower radiation dose
Which of the following is NOT a common application of computed tomography (CT)?
Monitoring the effectiveness of weight loss programs
What is the principle behind computed tomography (CT) imaging?
Detecting the absorption of X-rays as they pass through the body from multiple angles
What is the approximate size (diameter) of the bore or opening in a typical computed tomography (CT) scanner?
24-28 inches
Which of the following statements about computed tomography (CT) is FALSE?
CT is primarily used for diagnostic purposes in fields other than medicine
What is the main limitation of conventional radiography compared to computed tomography (CT)?
Conventional radiography has lower sensitivity to X-ray attenuation differences
Test your knowledge on the history of computed tomography and the limitations of conventional radiography in the Baghdad Radiological Techniques Department. Suitable for students of the second stage/2nd course. Name of the instructor: Lec.Dr.Lamyaa Fadhil Abdul Hussein.
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