Radiotherapy/Experimental Runs/2020-02-04: Difference between revisions
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=== Schematic === | === Schematic === | ||
<div class="image600px" style="text-align: center;"> | <div class="image600px" style="text-align: center;"> | ||
https://www.hep.ucl.ac.uk/pbt/wikiData/images/ | https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Feb2020/setup.png | ||
</div> | </div> | ||
=== Pre-data Taking Information and Notes === | === Pre-data Taking Information and Notes === | ||
* Used 200mmx200mmx2mm | * Used 200mmx200mmx2mm blue scintillator sheet polystyrene base sandwiched by two 200mmx200mmx50mm polystyrene clear plastic blocks | ||
* | * 565mm from lens to centre | ||
* Check camera in focus with ruler on the sheet | * Check camera in focus with ruler on the sheet | ||
* | * Ruler in focus at sheet | ||
* Scintillator blocks aligned to laser cross hairs | * Scintillator blocks aligned to laser cross hairs | ||
* 785 mm source to surface distance suitable for output factor/PDD/profile measurements. | * 785 mm source to surface distance suitable for output factor/PDD/profile measurements. | ||
* | * Wooden box is covered with black cloth | ||
* | * Camera height adjusted with wooden plates | ||
* | * Top surfaces of plastic blocks and sheet aligned with paper underneath | ||
== Data Taking == | == Data Taking == | ||
Revision as of 15:23, 24 August 2022
Second experimental measurements with Cyberknife at Birmingham. Green scintillator thin sheet measurements only.
Setup
Schematic
Pre-data Taking Information and Notes
- Used 200mmx200mmx2mm blue scintillator sheet polystyrene base sandwiched by two 200mmx200mmx50mm polystyrene clear plastic blocks
- 565mm from lens to centre
- Check camera in focus with ruler on the sheet
- Ruler in focus at sheet
- Scintillator blocks aligned to laser cross hairs
- 785 mm source to surface distance suitable for output factor/PDD/profile measurements.
- Wooden box is covered with black cloth
- Camera height adjusted with wooden plates
- Top surfaces of plastic blocks and sheet aligned with paper underneath
Data Taking
- All images taken with
- Canon EOS 1100D
- 18-55mm lens
- f/5
- 200ISO
- 30s exposure
- Beam turned on for a given amount of time within the 30s exposure
- This is noted in monitor units, with the beam having constant 1000MU/minute
- Used EOS utility app for controlling camera
- Image of ruler taken at sheet for pixels to mm conversion
- 3 images taken at each collimator size with 1 background image each.
| With scintillator sheet | |||
|---|---|---|---|
| Collimator Size (mm) | Monitor Units | Image | Comments |
| 5 | 400 |
| |
| 7.5 | 400 |
| |
| 10 | 400 |
| |
| 12.5 | 400 |
| |
| 15 | 400 |
| |
| 20 | 400 |
| |
| 25 | 300 |
| |
| 30 | 300 |
| |
| 35 | 250 |
| |
| 40 | 250 |
| |
| 50 | 150 |
| |
| 60 | 150 |
|
|
| No scintillator sheet | |||
|---|---|---|---|
| Collimator Size (mm) | Monitor Units | Image | Comments |
| 5 | 400 |
| |
| 7.5 | 400 |
| |
| 10 | 400 |
| |
| 12.5 | 400 |
| |
| 15 | 400 |
| |
| 20 | 400 |
| |
| 25 | 300 |
| |
| 30 | 300 |
| |
| 35 | 250 |
| |
| 40 | 250 |
| |
| 50 | 150 |
| |
| 60 | 150 |
| |
