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Questions and Answers
What is one of the primary purposes of developing a technique chart in radiography?
What is one of the primary purposes of developing a technique chart in radiography?
- To avoid higher repeat rates (correct)
- To increase patient dose
- To reduce radiation dose to the radiographer
- To decrease image consistency
Which type of exposure system tends to decrease patient dose and increase consistency of image receptor exposure?
Which type of exposure system tends to decrease patient dose and increase consistency of image receptor exposure?
- Variable kilovoltage system
- Fixed kilovoltage system (correct)
- Phantom image system
- Clinical trial system
In a fixed kilovoltage system, what is held constant while a single factor is permitted to vary?
In a fixed kilovoltage system, what is held constant while a single factor is permitted to vary?
- $mAs$ and contrast
- $kVp$ (correct)
- $mAs$
- $mAs$ and $kVp$
What is the main function of an optimal kilovoltage peak in a fixed kilovoltage system?
What is the main function of an optimal kilovoltage peak in a fixed kilovoltage system?
For what reason should the optimal kVp not be changed in a fixed kVp system?
For what reason should the optimal kVp not be changed in a fixed kVp system?
What benefit do variable kilovoltage systems offer in terms of body part thickness variation?
What benefit do variable kilovoltage systems offer in terms of body part thickness variation?
In a variable kilovoltage system, what happens to the value of kVp as the body part thickness increases?
In a variable kilovoltage system, what happens to the value of kVp as the body part thickness increases?
What is one advantage of a variable kilovoltage system over a fixed kilovoltage system?
What is one advantage of a variable kilovoltage system over a fixed kilovoltage system?
What is the primary feature of anatomically programmed radiography systems?
What is the primary feature of anatomically programmed radiography systems?
What is the primary purpose of establishing a technique chart?
What is the primary purpose of establishing a technique chart?
Which step is involved in establishing a technique chart?
Which step is involved in establishing a technique chart?
What is the purpose of conducting phantom testing after extrapolating the technical chart?
What is the purpose of conducting phantom testing after extrapolating the technical chart?
Which statement accurately describes the clinical trials step in establishing a technique chart?
Which statement accurately describes the clinical trials step in establishing a technique chart?
What is the purpose of the clinical fine-tuning step in establishing a technique chart?
What is the purpose of the clinical fine-tuning step in establishing a technique chart?
Which statement accurately describes the ongoing fine-tuning process for a technique chart?
Which statement accurately describes the ongoing fine-tuning process for a technique chart?
What is the purpose of the $15%$ rule mentioned in the text?
What is the purpose of the $15%$ rule mentioned in the text?
Which statement accurately describes the role of a radiologist in establishing a technique chart?
Which statement accurately describes the role of a radiologist in establishing a technique chart?
What is the purpose of producing a series of test exposures using an appropriate phantom?
What is the purpose of producing a series of test exposures using an appropriate phantom?
Which factor may necessitate adjustments to the technique chart over time?
Which factor may necessitate adjustments to the technique chart over time?
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Study Notes
Establishing a Technique Chart
- A systematic approach to establishing a technique chart involves producing phantom images, selecting optimal phantom images, extrapolating technical charts, phantom testing, clinical trials, clinical fine-tuning, and ongoing fine-tuning.
Technical Factors
- The computerized control can be programmed to display any desired exposure system and then fine-tuned to meet existing needs.
- The radiographer can modify the technical factor to achieve the desired outcome if needed.
Technique Chart
- A technique chart is used to provide a method of consistency in the quality of image production.
- It helps to avoid higher repeat rates and excessive increases in radiation dose to the patient.
- Monitoring and revising technique charts are part of quality control functions.
Fixed Kilovoltage System
- Fixed kilovoltage systems tend to decrease patient dose, provide more information on the image, increase consistency of image receptor exposure, lengthen exposure latitude, and reduce x-ray tube wear.
- They produce more scatter radiation, which leads to lower contrast than a variable kilovoltage system.
- Fixed kilovoltage systems function best when the number of variables is held constant while a single factor is permitted to vary.
- The kVp is held constant for a given range of subject densities and contrasts, while the mAs is varied to achieve the appropriate image receptor exposure.
Optimal Kilovoltage Peak
- The optimal kilovoltage peak is the maximum kVp level that will produce images with the appropriate contrast that are consistently within acceptance limits.
- The optimal kVp ensures sufficient penetration of the subject, provides acceptable image contrast, and limits the diagnostic region.
Variable Kilovoltage Systems
- Variable kilovoltage systems permit small incremental changes in exposure to compensate for variation in body part thickness.
- They produce higher contrast images, which enhance the visibility of fine detail and increase the perception of resolution.
- The kilovoltage to be used is varied depending on measured body part thickness, and a mAs value is specified for each body part to be examined.
Anatomically Programmed Radiography
- Anatomically programmed radiography involves computerized exposure controls systems and computerized technique charts utilizing existing exposure systems.
- These units have anatomically based programming and store data in a memory bank.
- If a radiographer selects a hip as a projection of choice, the system will automatically present more projections.
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