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Questions and Answers
Which type of radiation is also known as 'slow-down radiation' and occurs within the diagnostic range?
Which type of radiation is also known as 'slow-down radiation' and occurs within the diagnostic range?
What happens between 0-70 kVp?
What happens between 0-70 kVp?
Which type of x-ray has more opportunity to be absorbed?
Which type of x-ray has more opportunity to be absorbed?
Which one of these is the principle component of image quality that refers to the ability of the imaging system to image small and closely spaced objects?
Which one of these is the principle component of image quality that refers to the ability of the imaging system to image small and closely spaced objects?
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What causes attenuation differences in a radiograph?
What causes attenuation differences in a radiograph?
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What is the term used to describe the relative magnitude of differences within the remnant beam exiting the object?
What is the term used to describe the relative magnitude of differences within the remnant beam exiting the object?
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Which one of these is the factor that affects the magnitude of contrast on a radiograph?
Which one of these is the factor that affects the magnitude of contrast on a radiograph?
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Which one of these factors affects the size and relative position of the x-ray emission spectrum?
Which one of these factors affects the size and relative position of the x-ray emission spectrum?
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What is the primary controller of radiation quantity?
What is the primary controller of radiation quantity?
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What is the formula for the Inverse Square Law?
What is the formula for the Inverse Square Law?
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What is the correct answer for the following problem using the Inverse Square Law? An x-ray exposure of 240 mR is recorded at a distance of 20 inches. If the same technical factors are used, what will the exposure be if the distance is increased to 40 inches?
What is the correct answer for the following problem using the Inverse Square Law? An x-ray exposure of 240 mR is recorded at a distance of 20 inches. If the same technical factors are used, what will the exposure be if the distance is increased to 40 inches?
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Which of the following factors affect subject contrast in a radiograph?
Which of the following factors affect subject contrast in a radiograph?
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What is the main difference between CR and DR digital detectors?
What is the main difference between CR and DR digital detectors?
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What is the most relevant description of contrast potential in a digital image?
What is the most relevant description of contrast potential in a digital image?
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What is the main cause of quantum noise in digital x-ray?
What is the main cause of quantum noise in digital x-ray?
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Which x-ray room(s) in B114 uses a ceiling tube mount?
Which x-ray room(s) in B114 uses a ceiling tube mount?
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How many of the x-ray suites in B114 have the option of using Automatic Exposure Control?
How many of the x-ray suites in B114 have the option of using Automatic Exposure Control?
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Which x-ray suite possesses a challenge for trauma cases such as shoot through hip? Where would you find this unit in clinic practice?
Which x-ray suite possesses a challenge for trauma cases such as shoot through hip? Where would you find this unit in clinic practice?
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As the x-ray tube gets closer to the patient, does the skin dose increase or decrease?
As the x-ray tube gets closer to the patient, does the skin dose increase or decrease?
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Which of the following factors generally control the sharpness of image detail in an imaging system?
Which of the following factors generally control the sharpness of image detail in an imaging system?
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What is the magnification factor if the source-to-image receptor distance (SID) is 100 cm and the source-to-object distance (SOD) is 75 cm?
What is the magnification factor if the source-to-image receptor distance (SID) is 100 cm and the source-to-object distance (SOD) is 75 cm?
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What is the formula for calculating the edge gradient blurring (f) in terms of magnification (M) and focal spot (F)?
What is the formula for calculating the edge gradient blurring (f) in terms of magnification (M) and focal spot (F)?
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What is the critical distance for shape distortion in radiography?
What is the critical distance for shape distortion in radiography?
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Which one of the following is true about the focal spot in an x-ray tube?
Which one of the following is true about the focal spot in an x-ray tube?
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Which of the following factors affect the magnitude of contrast on an x-ray image?
Which of the following factors affect the magnitude of contrast on an x-ray image?
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Which statement is true about the anode heel effect?
Which statement is true about the anode heel effect?
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Which of the following is true about parallel and divergent x-ray beams?
Which of the following is true about parallel and divergent x-ray beams?
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Study Notes
Radiation Types
- Characteristic radiation is also known as 'slow-down radiation' and occurs within the diagnostic range.
X-ray Energy
- Between 0-70 kVp, the x-ray energy is low, resulting in a higher absorption rate.
X-ray Absorption
- Low-energy x-rays have more opportunity to be absorbed due to their shorter wavelength.
Image Quality
- Resolution is the principle component of image quality that refers to the ability of the imaging system to image small and closely spaced objects.
Attenuation Differences
- Attenuation differences in a radiograph are caused by the varying densities of the object being imaged.
Contrast and Remnant Beam
- The term used to describe the relative magnitude of differences within the remnant beam exiting the object is contrast.
- Contrast is the factor that affects the magnitude of contrast on a radiograph.
X-ray Emission Spectrum
- The size and relative position of the x-ray emission spectrum are affected by the x-ray tube voltage.
Radiation Quantity
- The primary controller of radiation quantity is the milliamperage (mA).
Inverse Square Law
- The formula for the Inverse Square Law is I₁ / I₂ = (d₂ / d₁)², where I is the intensity and d is the distance.
- Using the Inverse Square Law, if the distance is increased from 20 inches to 40 inches, the exposure will decrease to 60 mR.
Subject Contrast
- The following factors affect subject contrast in a radiograph: atomic number, density, and thickness of the object.
Digital Detectors
- The main difference between CR and DR digital detectors is the type of detector used: image plate versus flat-panel detector.
Contrast Potential
- The most relevant description of contrast potential in a digital image is the ability to visualize subtle differences in density.
Quantum Noise
- The main cause of quantum noise in digital x-ray is the random variation in the number of x-rays interacting with the detector.
X-ray Room Equipment
- Room 3 in B114 uses a ceiling tube mount.
- Three of the x-ray suites in B114 have the option of using Automatic Exposure Control.
- Room 2 possesses a challenge for trauma cases such as shoot through hip.
Clinic Practice
- The unit of measurement for x-ray exposure can be found in clinic practice.
Skin Dose
- As the x-ray tube gets closer to the patient, the skin dose increases.
Image Sharpness
- The following factors generally control the sharpness of image detail in an imaging system: focal spot size, geometric magnification, and motion.
Magnification Factor
- The magnification factor can be calculated using the formula: M = SID / SOD, where M is the magnification factor, SID is the source-to-image receptor distance, and SOD is the source-to-object distance.
Edge Gradient Blurring
- The formula for calculating the edge gradient blurring (f) in terms of magnification (M) and focal spot (F) is: f = M × F.
Shape Distortion
- The critical distance for shape distortion in radiography is 40 cm.
Focal Spot
- The focal spot in an x-ray tube is angled to reduce the heel effect.
Contrast and Anode Heel Effect
- The anode heel effect causes a decrease in intensity and contrast on the anode side of the x-ray beam.
Parallel and Divergent X-ray Beams
- Parallel x-ray beams have a uniform intensity and do not diverge, while divergent x-ray beams have a decreasing intensity and diverge as they travel away from the source.
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Description
Test your knowledge on X-ray equipment and automatic exposure control with this quiz. Learn about the features that allow you to control the X-ray tube current and voltage, ensuring a useful X-ray beam of proper quantity and quality. Explore topics such as kVp, mA or mAs, AEC, density, time, and focal spot size. Challenge yourself to understand how AEC works and how time affects the amount of photons received by the chambers.
