10 Kvp Rule

Discussion: Apart from unknown dose errors in the input skin during knee imaging, no errors were found in the rules tested. The use of manual technique selection instead of automatic exposure control allowed for consistent handling of technical factors. TLDs provided relatively reliable and fast readings of any exposure, although they may have been the cause of an error in measuring exposure of the predefined knee technique. The environment and equipment remained unchanged to maintain consistency. Maintaining or adjusting IR exposure can be achieved with kVp using the 15% rule. The 15% rule states that changing the kVp by 15% has the same effect as doubling the mA or reducing the mA by 50%; For example, increasing kVp from 82 to 94 (15%) results in the same exposure to IR as increasing mA from 10 to 20. To determine the effects of using AEC and AEC not by applying the 10 kVp rule in two experiments with an anthropomorphic pelvic phantom. The images were taken in increments of 10 kVp (60 to 120 kVp) for both experiments. The first experiment, based on seven AEC combinations, produced 49 images. The average mA of each kVp increment was used as the basis for the second experiment, which produced 35 images. A total of 84 images were produced and a panel of 5 experienced observers participated in the evaluation of the images using the two alternative visual calibration software Forced Choice (2AFC).

PCXMC software was used to estimate E. The results show that applying the E-rule of 10 kVp significantly reduces without significantly reducing the quality of the perceptual image. Further investigations should be carried out for a series of examinations using CR and digital radiography (DD) systems. Conclusion: The results showed that the 15% rule and the 10 kVp rule maintained or slightly improved the image quality depending on the detector`s exposure indicators. The results also showed a reduced dose for the patient based on the entry skin doses. Based on these results, the 10 kVp rule could be a reasonable replacement for the 15% rule. Further research should be done with more repetitions that include digital X-ray equipment for a wider range of investigations. A decrease in perceptual image quality with an increase in kVp was observed in the non-AEC and AEC experiments, but no statistically significant difference (p > 0.05) was found.

The image quality values of all observers in 10 kVp increments for all mAs values in non-AEC mode show a better score of up to 90 kVp. The electronic results show a statistically significant decrease (p = 0.000) in the 75th quartile from 0.37 mSv to 60 kVp to 0.13 mSv to 120 kVp when applying the 10 kVp rule in non-AEC mode. X-rays are usually not repeated due to contrast errors. Most often, the radiologist evaluates the resulting contrast to improve contrast for additional X-rays or similar circumstances that occur in another patient. If a repeated X-ray is required and kVp needs to be adjusted to increase or decrease contrast, the 15% rule provides an acceptable method of adjustment. If a 15% change in kVp is performed to maintain exposure to riroses, the radiologist should adjust the mA by a factor of 2. Keep in mind that a 15% change in kVp does not produce the same effect over the entire range of kVp used in radiography. A high kVp (90 and above) requires a greater increase than the low kVp (less than 70). Objective: To determine whether an increase in tube voltage of 10 kVp while simultaneously reducing tube current by 50% (10 kVp rule) produces similar perception image quality. Method: 391 corresponding pairs of anthropomorphic thoracic ghost images were generated on a computerized X-ray (CR) system.

Five experienced clinicians evaluated the images using a method of forced selection comparison with 2 alternatives. Based on the acquisition parameters and the product values of the dose zone (DAP), the effective dose (E) for all images was calculated using dose calculation software. Results: It was found that the perception quality values before and after the application of the 10 kVp “rule” had no statistical difference (p > 0.1), suggesting that the increase in kVp and the reduction in mA had only a limited impact on the quality of the perceptual image. In all cases, E decreased by an average of 36% (n.d. 7%) after the “rule” was applied (p. < 0.001). Conclusion: The results show that applying the 10 kVp "rule" significantly reduces E without significantly reducing the quality of perception images. Further investigations should be carried out for a series of examinations using CR and digital radiography (DD) systems.

Methods: Three anteroposterian or posteroposterior exposures were made to 3 anthropomorphic phantom extremities: hand, knee and shoulder. Thermoluminescence dosimeters (TLDs) were placed in the middle of each phantom; A new TLD was used for each exhibition. The exhibitions were carried out on a Defininium 8000 digital radiography system (General Electric) using the unchanged techniques predefined by the system by the authors` imaging department, techniques adapted to the 10 kVp rule and techniques adapted by the 15% rule.