12 Questions
What is the primary reason for the differential absorption of x-rays by different body parts?
The primary reason for differential absorption is due to the difference in density and atomic number of various body parts.
What is the effect of beam attenuation on the x-ray beam as it passes through tissue?
The intensity of the x-ray beam is halved for every 5cm of tissue it passes through.
What is the purpose of a side-marker in radiography?
A side-marker is used to identify the correct side (left or right) of the radiographic image.
What is the difference between high contrast and low contrast in radiographic imaging?
High contrast produces sharper differences with fewer grey scales, while low contrast produces more grey scales with smaller differences.
What is the function of a collimator in radiography?
A collimator is used to move the light beam diagram to change the field of view (FOV).
What is the difference between computed radiography (CR) and digital radiography (DR)?
CR uses phosphor plates, while DR uses flat-panel detectors.
What is the primary way electromagnetic radiation travels through air, and what happens when it interacts with matter?
Electromagnetic radiation travels in straight lines until it interacts with matter, at which point energy is transferred.
What is the difference between electrical and electromagnetic energy in the context of an X-ray machine?
Electrical energy is used to control the console, while electromagnetic energy is produced at the anode to generate X-rays.
What is the resulting image called when X-rays pass through a patient and are captured on an imaging receptor, and what type of energy is used to produce the final image?
The resulting image is called a latent image, and it is processed using chemical energy to produce a 2D X-ray image.
What is Compton scatter, and why is it undesirable in medical imaging?
Compton scatter is an interaction between X-rays and outer electrons, resulting in scattered X-rays that change direction and lose energy, creating image noise.
What are the three main interactions of X-rays with matter, and what are their respective effects on the X-ray beam?
The three main interactions are Compton scatter, photoelectric absorption, and transmission, which scatter, absorb, and transmit the X-ray beam, respectively.
What percentage of the primary X-ray beam reaches the image receptor, and how much of it interacts to create the final image?
Less than 1% of the primary beam reaches the image receptor, and only 0.5% of it interacts to create the final image.
Learn about the properties of electromagnetic radiation and its application in medical imaging, including X-ray production and detection. Understand how X-rays interact with matter and transfer energy. Explore the process of creating a latent image and its processing.
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