Podcast
Questions and Answers
What is the primary reason for assessing different densities of anatomical tissues in radiography?
What is the primary reason for assessing different densities of anatomical tissues in radiography?
Which radiographic technique results in high contrast imaging?
Which radiographic technique results in high contrast imaging?
What effect does low radiographic contrast have on image quality?
What effect does low radiographic contrast have on image quality?
Which of the following conditions can indicate the presence of an abnormality during a radiographic examination?
Which of the following conditions can indicate the presence of an abnormality during a radiographic examination?
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What principle should radiographers follow to ensure minimal exposure while achieving diagnostic image quality?
What principle should radiographers follow to ensure minimal exposure while achieving diagnostic image quality?
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What is the primary focus of training for a student radiographer?
What is the primary focus of training for a student radiographer?
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Which imaging modality involves the use of ionising radiation to create real-time images?
Which imaging modality involves the use of ionising radiation to create real-time images?
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Which of the following is NOT a responsibility of a radiographer?
Which of the following is NOT a responsibility of a radiographer?
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What is an essential consideration for radiographic techniques?
What is an essential consideration for radiographic techniques?
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Which imaging technique is primarily used for evaluating blood vessels?
Which imaging technique is primarily used for evaluating blood vessels?
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What is a standard outcome of a plain radiograph?
What is a standard outcome of a plain radiograph?
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Which statement is true regarding the imaging modalities studied in MRSC1150?
Which statement is true regarding the imaging modalities studied in MRSC1150?
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In which setting do radiographers typically work?
In which setting do radiographers typically work?
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What does kVp primarily influence in radiographic imaging?
What does kVp primarily influence in radiographic imaging?
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Which parameter would need to be adjusted when imaging a pediatric patient compared to the average adult?
Which parameter would need to be adjusted when imaging a pediatric patient compared to the average adult?
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Why are departmental protocols important in radiography?
Why are departmental protocols important in radiography?
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What effect does increasing the mAs have on radiographic imaging?
What effect does increasing the mAs have on radiographic imaging?
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In what way does collimation impact radiographic technique?
In what way does collimation impact radiographic technique?
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What is a crucial role of evaluating each projection during a radiographic examination?
What is a crucial role of evaluating each projection during a radiographic examination?
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Which of the following correctly describes the relationship between mA and mAs?
Which of the following correctly describes the relationship between mA and mAs?
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What does the FFD (Focus to Film Distance) primarily affect in radiographic images?
What does the FFD (Focus to Film Distance) primarily affect in radiographic images?
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Study Notes
Radiography: General Process
- The main purpose of radiography is to visualize different densities of tissue.
- Radiography depends on the differences in density between different tissues.
- Each anatomical area has a normal appearance.
- Departmental protocols are designed to provide required information in the minimum number of projections.
- Projections (radiographs) must be evaluated individually and as a part of a series to determine their value to the examination.
Technical Parameters
- Technical parameters are used to acquire the image.
- **Technical parameters include: **
- Positioning of the patient and tube
- Focus to film distance (FFD)
- Tube angle
- Exposure (kVp and mAs)
- Collimation
- Centring
Exposure
- Exposure is determined by the radiographer.
- Exposure will change when imaging patients who are smaller or larger than average.
- Paediatric patients will receive lower exposure levels.
Kilovoltage Peak (kVp)
- kVp is a tube voltage factor that radiographers manipulate on the x-ray console.
- kVp controls the acceleration of electrons from the cathode to the anode.
- kVp determines the penetration power of the x-ray beam.
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Increased kVp leads to:
- Increased beam energy
- Increased penetration
- Increased scattering
- Increased image density
- Decreased image contrast
Milliampere-Seconds (mAs)
- mAs controls the number of x-rays generated.
- mAs is also a factor that radiographers manipulate on the x-ray console.
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Increased mAs leads to:
- Increased image density
- Increased number of photons reaching the detector
- Increased number of interactions
- Increased patient absorbed dose
Radiographic Contrast
- Radiographic contrast refers to the difference in densities between structures next to each other.
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High contrast (low kVp):
- Few densities
- Greater difference among densities
- More "black and white"
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Low contrast (high kVp):
- Many grey tones
- Less difference between individual densities
- More "shades of grey"
Why is radiographic contrast important?
- High contrast can miss subtle details.
- Low contrast can lead to unwanted density or fog from scatter radiation.
- An appropriate kVp range is used to obtain the right amount of radiographic contrast for each anatomic region.
Radiation Protection
- The ALARA principle is the standard of radiation protection that all radiographers must uphold.
- ALARA stands for As Low As Reasonably Achievable.
- The exposure settings should be as low as possible to achieve a diagnostic image for reporting.
General Radiography
- General radiography is a major focus of a radiographer’s training and career.
- Plain radiographs are ordered for various clinical presentations and provide answers to clinical questions.
- There are standard and modified projections for each anatomic region.
- Radiographic technique must account for a wide range of patients of different sizes, ages, and mobility levels.
Why are densities important?
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Densities allow visualization of:
- Air in an area it shouldn’t be
- Fluid in an area it shouldn’t be
- Soft tissue lesions
- Anything that differs from normal anatomical structures
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Description
This quiz covers the basic principles of radiography, including the general process, technical parameters for image acquisition, and exposure considerations for different patient sizes. Understand how to evaluate radiographs and the importance of departmental protocols in delivering accurate imaging results.
