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The 142nd task force of the american association of medical physics (aapm) (tt-142) recommended that the surface kv image should be checked during the monthly quality assurance (qa) period in table vi: images。
For kv imaging qckv-1 module, qckv-1 module test parameters: contrast, noise, evenness (nema), spatial resolution, modem. Support sand distribution analysis。
Kv imaging qckv-1 model, qckv-1 model size specification:
Dimensions10. 7 cm width (4. 21 in)
Length 12. 7 cm (5. 0 in)
Height 1. 6 cm (0. 63 in)
0. 25 kg (0. 55 pounds)
The "uniform" and "noise" values are determined as follows:
- The analysis found six areas shown in yellow in the two images above。
- Subtract the corresponding area between the two images。
- Calculation of standard deviations for each area difference (6 figures at this time)
- Calculates the median of the six standard deviations。
- The median value is divided by the square root of 2。
Image collection recommendations
The following are general guidelines on image collection. The exact methodology will depend on the equipment and configuration of the site。
The movement made it possible to have the kv arm and the dragon door frame and then moved them in。
Removes all filters (e. G., half fans) from the kv source。
Places the model on a kv detector to ensure that the model is up and that the top image is marked with 1 area。
Ensure that the model is reasonably placed at the center of the field of view with a 45% angle on the kv detector. Some of the c series of valiant linac have a set of red lasers at kv source that can be used to match models. Truebeams does not have this function, but green wall lasers can be used to extrapolate location。
The adjustment is straight enough to expose the complete model and the entire image outside the model is empty. While image processing is robust, too many hypocritical images in and around the image may affect the ability to process the image。
In the imaging software, select the kv acquisition parameter. The following parameters are a good starting point, but may need to be adapted to the site environment:
Anatomy
Sid = 150 cm
50 kv/h
10 mas (250 ma, 50 ms)
In imaging software, images are captured and exported for use。
Repeat the above steps for the second image。
The movement made it possible to have the kv arm and the dragon door frame and then moved them in。
Removes all filters (e. G., half fans) from the kv source。
Places the model on a kv detector to ensure that the model is up and that the top image is marked with 1 area。
Ensure that the model is reasonably placed at the center of the field of view with a 45% angle on the kv detector. Some of the c series of valiant linac have a set of red lasers at kv source that can be used to match models. Truebeams does not have this function, but green wall lasers can be used to extrapolate location。
The adjustment is straight enough to expose the complete model and the entire image outside the model is empty. While image processing is robust, too many hypocritical images in and around the image may affect the ability to process the image。
In the imaging software, select the kv acquisition parameter. The following parameters are a good starting point, but may need to be adapted to the site environment:
Anatomy
Sid = 150 cm
50 kv/h
10 mas (250 ma, 50 ms)
In imaging software, images are captured and exported for use。
Repeat the above steps for the second image。