Radiotherapy/Experimental Runs/2022-07-26: Difference between revisions

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Green scintillator thin sheet measurements only.
Green scintillator thin sheet measurements only.


== Schematic ==
== 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------------------------------------------ -->
<b> First run </b>
<b> First run </b>
{|class="wikitable" style="display: inline-table;"
{|class="wikitable" style="display: inline-table;"
!colspan="4" | With scintillator sheet
|-
!Collimator Size (mm)
!Collimator Size (mm)
!Exposure (s)
!Exposure (s)
Line 71: Line 101:


{|class="wikitable" style="display: inline-table;"
{|class="wikitable" style="display: inline-table;"
!colspan="4" | No scintillator sheet
|-
!Collimator Size (mm)
!Collimator Size (mm)
!Exposure (s)
!Exposure (s)
Line 76: Line 108:
!Comments
!Comments
|-
|-
| 5 || 30 || <div class="image150px" style="text-align: center;">
| 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 84: Line 117:


{|class="wikitable" style="display: inline-table;"
{|class="wikitable" style="display: inline-table;"
!colspan="4" | With scintillator sheet
|-
!Collimator Size (mm)
!Collimator Size (mm)
!Exposure (s)
!Exposure (s)
Line 136: 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------------------------------------------ -->


{|class="wikitable" style="display: inline-table;"
{|class="wikitable" style="display: inline-table;"
!colspan="4" | No scintillator sheet
|-
!Collimator Size (mm)
!Collimator Size (mm)
!Exposure (s)
!Exposure (s)
Line 200: Line 241:
Section commented out
Section commented out
-->
-->
|}
----
<center>'''End of range telescope tests.'''</center>
== Experiment Plan ==
'''Rev. B Prototype'''
*Background & calibration shoot-throughs (background at all 8 DDC232 full-scale ranges – likely 12.5 pC is most appropriate FSR)
*Pencil beams, 70-130 MeV, 10 MeV steps, in both directions into stack. For direction with Bragg peak in clear sheets, test 2 currents (high/low)
'''Rev. C Prototype'''
*Background & calibration shoot-throughs (12.5 pC FSR)
*Pencil beams, 70-110 MeV, 5 MeV steps, at clinical current.
== Experiment Notes ==
Range calorimeter measurements with CMOS sensor + photodiodes.
Images from Sensor: '''[http://www.hep.ucl.ac.uk/pbt/wikiData/images/UCLH_Jun2022/Nikon /unix/www/html/pbt/wikiData/images/UCLH_Jun2022/CMOS]'''
Photodiode hexadecimal data: '''/unix/pbt/data/uclh/20220616/DDC232'''
{| class="wikitable"
!Run number
!Beam Energy (MeV)
!Estimated Range (mm)
!Current (nA)
!Spot size (mm, FWHM)
!DDC232 FSR (pC)
!DDC232 Integration Time (us)
!Degrader WET (mm)
!Comments
!Photodiode QB Fit
!CMOS QB Fit
!PDL Comparison
!Replay Fit
|-
|0 || Background || N/A || N/A || N/A || 350 || 170 || 0 || room light off || N/A || N/A || N/A || N/A
|-
|1 || Background || N/A || N/A || N/A || 300 || 170 || 0 || room light off || N/A || N/A || N/A || N/A
|-
|2 || Background || N/A || N/A || N/A || 250 || 170 || 0 || room light off || N/A || N/A || N/A || N/A
|-
|3 || Background || N/A || N/A || N/A || 200 || 170 || 0 || room light off || N/A || N/A || N/A || N/A
|-
|4 || Background || N/A || N/A || N/A || 150 || 170 || 0 || room light off || N/A || N/A || N/A || N/A
|-
|5 || Background || N/A || N/A || N/A || 100 || 170 || 0 || room light off || N/A || N/A || N/A || N/A
|-
|6 || Background || N/A || N/A || N/A || 50 || 170 || 0 || room light off || N/A || N/A || N/A || N/A
|-
|7 || Background || N/A || N/A || N/A || 12.5 || 170 || 0 || room light off (continued)|| N/A || N/A || N/A || N/A
|-
|8 || 240 || N/A || 10|| N/A || 350 || 170 || 50 || LH shoot through; 270° gantry; CMOS sensor saturated|| N/A || N/A || N/A || N/A
|-
|9 || 240 || N/A || 10 || N/A || 12.5 || 170 || 50 || LH shoot through; 270° gantry; CMOS sensor saturated || N/A || N/A || N/A || N/A
|-
|10 || 240 || N/A || 10 || N/A || 12.5 || 170 || 50 || RH shoot through; 90° gantry; CMOS sensor saturated || N/A || N/A || N/A || N/A
|-
|11 || 200 || N/A || 90 || N/A || 12.5 || 170 || 50 || RH shoot through; 90° gantry; CMOS sensor saturated; || N/A || N/A || N/A || N/A
|-
|12 || 200 || N/A || 20 || N/A || 12.5 || 170 || 50 || RH shoot through; 90° gantry; CMOS sensor fine; || N/A || N/A || N/A || N/A
|-
|13 || 130 || N/A || 50 || N/A || 12.5 || 170 || 0 || 90° gantry; CMOS sensor slight saturation; || N/A || N/A || N/A || N/A
|-
|14 || 120 || N/A || 60 || N/A || 12.5 || 170 || 0 || 90° gantry; CMOS sensor saturated; || N/A || N/A || N/A || N/A
|-
|15 || 120 || N/A || 270 || N/A || 12.5 || 170 || 0 || 90° gantry; CMOS sensor saturated; || N/A || N/A || N/A || N/A
|-
|16 || 110 || N/A || 70 || N/A || 12.5 || 170 || 0 || 90° gantry; CMOS sensor saturated; || N/A || N/A || N/A || N/A
|-
|17 || 110 || N/A || 300 || N/A || 12.5 || 170 || 0 || 90° gantry; CMOS sensor saturated; || N/A || N/A || N/A || N/A
|-
|18 || 100 || N/A || 90 || N/A || 12.5 || 170 || 0 || 90° gantry; CMOS sensor saturated; || N/A || N/A || N/A || N/A
|-
|19 || 100 || N/A || 350 || N/A || 12.5 || 170 || 0 || 90° gantry; CMOS sensor saturated; || N/A || N/A || N/A || N/A
|-
|20 || 90 || N/A || 110 || N/A || 12.5 || 170 || 0 || 90° gantry; CMOS sensor fine; || N/A || N/A || N/A || N/A
|-
|21 || 90 || N/A || 400 || N/A || 12.5 || 170 || 0 || 90° gantry; CMOS sensor fine; || N/A || N/A || N/A || N/A
|-
|22 || 80 || N/A || 500 || N/A || 12.5 || 170 || 0 || 90° gantry; CMOS sensor fine; || N/A || N/A || N/A || N/A
|-
|23 || 70 || N/A || 700 || N/A || 12.5 || 170 || 0 || 90° gantry; CMOS sensor fine; || N/A || N/A || N/A || N/A
|-
|24 || 130 || N/A || 200 || N/A || 12.5 || 170 || 0 || 90° gantry; CMOS sensor saturated; || N/A || N/A || N/A || N/A
|-
|25 || 200 || N/A || 20 || N/A || 12.5 || 170 || 50 || LH shoot through; 270° gantry; CMOS sensor fine; || N/A || N/A || N/A || N/A
|-
|26 || 130 || N/A || 200 || N/A || 12.5 || 170 || 0 || 270° gantry; CMOS sensor saturated; || N/A || N/A || N/A || N/A
|-
|27 || 120 || N/A || 270 || N/A || 12.5 || 170 || 0 || 270° gantry; CMOS sensor saturated; || N/A || N/A || N/A || N/A
|-
|28 || 110 || N/A || 300 || N/A || 12.5 || 170 || 0 || 270° gantry; CMOS sensor saturated; || N/A || N/A || N/A || N/A
|-
|29 || 100 || N/A || 350 || N/A || 12.5 || 170 || 0 || 270° gantry; CMOS sensor saturated; || N/A || N/A || N/A || N/A
|-
|30 || 90 || N/A || 400 || N/A || 12.5 || 170 || 0 || 270° gantry; CMOS sensor saturated; || N/A || N/A || N/A || N/A
|-
|31 || 80 || N/A || 500 || N/A || 12.5 || 170 || 0 || 270° gantry; CMOS sensor saturated; || N/A || N/A || N/A || N/A
|-
|32 || 70 || N/A || 700 || N/A || 12.5 || 170 || 0 || 270° gantry; CMOS sensor saturated; || N/A || N/A || N/A || N/A
|-
|33 || background || N/A || N/A || N/A || 12.5 || 170 || 0 || RevC onwards; 270° gantry || N/A || N/A || N/A || N/A
|-
|34 || 240 || N/A || 13 || N/A || 12.5 || 170 || 50 || LH shoot through; 270° gantry || N/A || N/A || N/A || N/A
|-
|35 || 240 || N/A || 13 || N/A || 12.5 || 170 || 50 || RH shoot through; 90° gantry || N/A || N/A || N/A || N/A
|-
|36 || 110 || N/A || 300 || N/A || 12.5 || 170 || 0 || 90° gantry; || N/A || N/A || N/A || N/A
|-
|37 || 105 || N/A || 350 || N/A || 12.5 || 170 || 0 || 90° gantry; || N/A || N/A || N/A || N/A
|-
|38 || 100 || N/A || 350 || N/A || 12.5 || 170 || 0 || 90° gantry; || N/A || N/A || N/A || N/A
|-
|39 || 95 || N/A || 400 || N/A || 12.5 || 170 || 0 || 90° gantry; || N/A || N/A || N/A || N/A
|-
|40 || 90 || N/A || 400 || N/A || 12.5 || 170 || 0 || 90° gantry; || N/A || N/A || N/A || N/A
|-
|41 || 85 || N/A || 500 || N/A || 12.5 || 170 || 0 || 90° gantry; || N/A || N/A || N/A || N/A
|-
|42 || 80 || N/A || 500 || N/A || 12.5 || 170 || 0 || 90° gantry; || N/A || N/A || N/A || N/A
|-
|43 || 75 || N/A || 700 || N/A || 12.5 || 170 || 0 || 90° gantry; || N/A || N/A || N/A || N/A
|-
|44 || 70 || N/A || 700 || N/A || 12.5 || 170 || 0 || 90° gantry; || N/A || N/A || N/A || N/A

Latest revision as of 16:58, 19 August 2022

Second experimental measurements with Cyberknife at Birmingham. Green scintillator thin sheet measurements only.

Setup

Schematic

setup.png

Photos of setup

_DSC4718.JPG _DSC4715.JPG _DSC4713.JPG _DSC4716.JPG

(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

size_5mm.jpg

7.5 20

size_7-5mm.jpg

10 15

size_10mm.jpg

12.5 10

size_12-5mm.jpg

15 8

size_15mm.jpg

20 8

size_20mm.jpg

25 6

size_25mm.jpg

30 6

size_30mm.jpg

35 5

size_35mm.jpg

40 4

size_40mm.jpg

50 3

size_50mm.jpg

60 3

size_60mm.jpg

No scintillator sheet
Collimator Size (mm) Exposure (s) Image Comments
60 3

size_60mm.jpg

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

size_5mm.jpg

7.5 20

size_7-5mm.jpg

10 15

size_10mm.jpg

12.5 10

size_12-5mm.jpg

15 8

size_15mm.jpg

20 8

size_20mm.jpg

25 6

size_25mm.jpg

30 6

size_30mm.jpg

35 5

size_35mm.jpg

40 4

size_40mm.jpg

50 3

size_50mm.jpg

60 3

size_60mm.jpg

Green discolouration probably from scintillator sheet.
Rotated by 90 when re-assembling blocks and sheet

No scintillator sheet
Collimator Size (mm) Exposure (s) Image Comments
5 30

size_5mm.jpg

7.5 20

size_7-5mm.jpg

10 15

size_10mm.jpg

12.5 10

size_12-5mm.jpg

15 8

size_15mm.jpg

20 8

size_20mm.jpg

25 6

size_25mm.jpg

30 6

size_30mm.jpg

35 5

size_35mm.jpg

40 4

size_40mm.jpg

50 3

size_50mm.jpg

60 3

size_60mm.jpg

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