Radiotherapy/Experimental Runs/2022-07-26: Difference between revisions
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Second run
Replaced plastic blocks from first run with new un-irradiated plastic blocks, but using same green scintillator sheet.
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Green scintillator thin sheet measurements only. | Green scintillator thin sheet measurements only. | ||
== | == Setup == | ||
=== Schematic === | |||
<div class="image600px" style="text-align: center;"> | <div class="image600px" style="text-align: center;"> | ||
https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/setup.png | https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/setup.png | ||
</div> | </div> | ||
=== Photos of setup === | |||
<div class="image300px" style="text-align: center;"> | |||
[https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/_DSC4718.JPG https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/_DSC4718.JPG] | |||
[https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/_DSC4715.JPG https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/_DSC4715.JPG] | |||
[https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/_DSC4713.JPG https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/_DSC4713.JPG] | |||
[https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/_DSC4716.JPG https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/_DSC4716.JPG] | |||
</div> | |||
(Inside pelicase, outside pelicase, collimators, through pelicase window) | |||
=== Pre-data Taking Information and Notes === | |||
* Used 200mmx200mmx2mm green scintillator sheet polystyrene base sandwiched by two 200mmx200mmx50mm polystyrene clear plastic blocks | |||
* 53cm from lens to sheet | |||
* Check camera in focus with ruler on the sheet | |||
* Near/Far limit of focus 49.4cm 57.1cm calculated using https://dofmaster.com/dofjs.html | |||
* Pelicase on couch | |||
* Scintillator blocks aligned to laser cross hairs | |||
* 785 mm source to surface distance suitable for output factor/PDD/profile measurements. | |||
* Room lights out and pelicase window open. | |||
* Check optical axis aligned with top surface using crosshair in the image analysis. | |||
* Arrived at hospital at 11am, finished data taking at 5pm | |||
== Data Taking == | == Data Taking == | ||
All images taken with Nikon D7000, 20mm lens, f/2.8, 400ISO | * All images taken with Nikon D7000, 20mm lens, f/2.8, 400ISO | ||
* Used camera control pro 2 app | |||
* Image of ruler taken at sheet for pixels to mm conversion | |||
* 5 images taken at each collimator size with 1 background image each. | |||
* Change exposure time until near max saturation - get's best bit depth | |||
* View data analysis [https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/data_analysis.pdf here] | |||
<!-- ------------------------------------table1------------------------------------------ --> | <!-- ------------------------------------table1------------------------------------------ --> | ||
| Line 80: | Line 108: | ||
!Comments | !Comments | ||
|- | |- | ||
| | | 60 || 3 || <div class="image150px" style="text-align: center;"> | ||
[https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/nosheet_1/size_60mm.jpg https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/nosheet_1/size_60mm.jpg] | [https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/nosheet_1/size_60mm.jpg https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/nosheet_1/size_60mm.jpg] | ||
</div> | </div> | ||
|| Can see green discolouration caused by previous irradiations. <br> Blocks must have been rotated by 90 when re-assembling | |||
|- | |- | ||
| Line 142: | Line 171: | ||
[https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_2/size_60mm.jpg https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_2/size_60mm.jpg] | [https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_2/size_60mm.jpg https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_2/size_60mm.jpg] | ||
</div> | </div> | ||
|| | |||
Green discolouration probably from scintillator sheet. <br> Rotated by 90 when re-assembling blocks and sheet | |||
|- | |- | ||
<br> | <br> | ||
<b> Second run </b> | <b> Second run </b> | ||
<br> | |||
Replaced plastic blocks from first run with new un-irradiated plastic blocks, but using same green scintillator sheet. | |||
<br> | <br> | ||
<!-- ------------------------------------table4------------------------------------------ --> | <!-- ------------------------------------table4------------------------------------------ --> | ||
Latest revision as of 16:58, 19 August 2022
Second experimental measurements with Cyberknife at Birmingham. Green scintillator thin sheet measurements only.
Setup
Schematic
Photos of setup
(Inside pelicase, outside pelicase, collimators, through pelicase window)
Pre-data Taking Information and Notes
- Used 200mmx200mmx2mm green scintillator sheet polystyrene base sandwiched by two 200mmx200mmx50mm polystyrene clear plastic blocks
- 53cm from lens to sheet
- Check camera in focus with ruler on the sheet
- Near/Far limit of focus 49.4cm 57.1cm calculated using https://dofmaster.com/dofjs.html
- Pelicase on couch
- Scintillator blocks aligned to laser cross hairs
- 785 mm source to surface distance suitable for output factor/PDD/profile measurements.
- Room lights out and pelicase window open.
- Check optical axis aligned with top surface using crosshair in the image analysis.
- Arrived at hospital at 11am, finished data taking at 5pm
Data Taking
- All images taken with Nikon D7000, 20mm lens, f/2.8, 400ISO
- Used camera control pro 2 app
- Image of ruler taken at sheet for pixels to mm conversion
- 5 images taken at each collimator size with 1 background image each.
- Change exposure time until near max saturation - get's best bit depth
- View data analysis here
First run
| With scintillator sheet | |||
|---|---|---|---|
| Collimator Size (mm) | Exposure (s) | Image | Comments |
| 5 | 30 |
| |
| 7.5 | 20 |
| |
| 10 | 15 |
| |
| 12.5 | 10 |
| |
| 15 | 8 |
| |
| 20 | 8 |
| |
| 25 | 6 |
| |
| 30 | 6 |
| |
| 35 | 5 |
| |
| 40 | 4 |
| |
| 50 | 3 |
| |
| 60 | 3 |
| |
| No scintillator sheet | |||
|---|---|---|---|
| Collimator Size (mm) | Exposure (s) | Image | Comments |
| 60 | 3 |
|
Can see green discolouration caused by previous irradiations. Blocks must have been rotated by 90 when re-assembling |
Second run
Replaced plastic blocks from first run with new un-irradiated plastic blocks, but using same green scintillator sheet.
| With scintillator sheet | |||
|---|---|---|---|
| Collimator Size (mm) | Exposure (s) | Image | Comments |
| 5 | 30 |
| |
| 7.5 | 20 |
| |
| 10 | 15 |
| |
| 12.5 | 10 |
| |
| 15 | 8 |
| |
| 20 | 8 |
| |
| 25 | 6 |
| |
| 30 | 6 |
| |
| 35 | 5 |
| |
| 40 | 4 |
| |
| 50 | 3 |
| |
| 60 | 3 |
|
Green discolouration probably from scintillator sheet. |
| No scintillator sheet | |||
|---|---|---|---|
| Collimator Size (mm) | Exposure (s) | Image | Comments |
| 5 | 30 |
| |
| 7.5 | 20 |
| |
| 10 | 15 |
| |
| 12.5 | 10 |
| |
| 15 | 8 |
| |
| 20 | 8 |
| |
| 25 | 6 |
| |
| 30 | 6 |
| |
| 35 | 5 |
| |
| 40 | 4 |
| |
| 50 | 3 |
| |
| 60 | 3 |
| |
