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.


== Experiment Equipment ==
== Setup ==
{| class="wikitable"
 
! style="text-align: center;" | Item
=== Schematic ===
! style="text-align: center;" | Notes
|-
| style="text-align: center;" | Network Hub
| style="text-align: center;" | Set in control room to take output from experimental room ethernet connection. Control laptops connected via 5GHz WiFi.
|-
| style="text-align: center;" | Control Laptop x3
| style="text-align: center;" | 2 for remote control of CMOS sensor and FPGA, 1 for notes/web GUI.
|-
| style="text-align: center;" | Ethernet Cable x 3
| style="text-align: center;" | To connect DAQ laptops to network in the experimental room, network hub to network in control room.
|-
| style="text-align: center;" | Portable Enclosure
| style="text-align: center;" | Modified Big Zarges Waterproof Wheeled Equipment Case.
Features mount for scintillator stack, front and back openings for beam, patch panel with ports for SHV, BNC, SMA, USB, Camera Link cables. <br/>
Hole for sensor powering. <br/>
Mylar windows with Al support mounted to internal face: approximately light-tight.
|-
| style="text-align: center;" | Rev. B Scintillator stack
| style="text-align: center;" | 49 (25 clear, 23 white painted and 1 black painted) X x 100 mm, Y x 100 mm and Z x (approx) 2.8 mm sheets in ascending order from the front/beam of the end of the scintillator. Sheet numbers from front to end (in beam direction gantry angle 270°): 79, 68, 73, 62, 81, 72, 64, 67, 65, 71, 78, 77, 74, 75, 85, 82, 83, 76, 70, 80, 69, 84, 63, 66, 61, 34, 43, 32, 8, 40, 37, 38, 47, 46, 33, 42, 9, 39, 44, 49, 50, 31, 1, 45, 3, 54, 5, 51, 26. Full stack thickness measurements (in mm): 138.12, 137.74, 137.74.
|-
| style="text-align: center;" | Rev. C Scintillator stack
| style="text-align: center;" | 32 X x 105 mm, Y x 105 mm and Z x (approx) 3 mm sheets (21 3.4 mm and 11 2.0 mm) in ascending order from the front/beam of the end of the scintillator. Sheet numbers from front to end (in beam direction gantry angle 90°): 117, 113, 134, 110, 108, 128, 107, 106, 127, 105, 104, 125, 103, 102, 124, 101, 98, 123, 97, 96, 122, 94, 93, 121, 92, 90, 120, 89, 88, 119, 87, 135. Full stack thickness measurements (in mm): 95.87, 95.96, 95.97.
|-
| style="text-align: center;" | DAQ laptop x2
| style="text-align: center;" | Control CMOS sensor and photodiode acquisition.
|-
| style="text-align: center;" | ISDI CMOS sensor
| style="text-align: center;" | sensor pixel dimension: 1030 x 1536. NO optical grease between scintillator and sensor. Connected to DAQ PC via Camera Link cable.
|-
| style="text-align: center;" | Nexys Video FPGA development board.
| style="text-align: center;" | For interfacing between DDC232 and PC.
|-
| style="text-align: center;" | Rev. B Texas Instruments DDC232 custom circuit board (x3)
| style="text-align: center;" | Each housing 16x Hamamatsu S12915-16R photodiodes, coupled directly to scintillator sheets. Aligned by eye to scintillator sheets.
|-
| style="text-align: center;" | Rev. C Texas Instruments DDC232 custom circuit board (x1)
| style="text-align: center;" | Housing 32x Hamamatsu S12915-16R photodiodes, coupled directly to scintillator sheets. Aligned by eye to scintillator sheets.
|-
| style="text-align: center;" | Gloves
| style="text-align: center;" | For handling scintillator
|}
==== Schematic ====
<div class="image600px" style="text-align: center;">
<div class="image600px" style="text-align: center;">
[http://www.hep.ucl.ac.uk/pbt/wikiData/images/UCLH_Nov2021/UCL_Setup.png http://www.hep.ucl.ac.uk/pbt/wikiData/images/UCLH_Jun2022/UCL_Setup.png]
https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/setup.png
</div>
</div>


== Experiment Plan ==
=== Photos of setup ===


'''Rev. B Prototype'''
<div class="image300px" style="text-align: center;">
*Background & calibration shoot-throughs (background at all 8 DDC232 full-scale ranges – likely 12.5 pC is most appropriate FSR)
[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]
*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)
[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 ===


'''Rev. C Prototype'''
* Used 200mmx200mmx2mm green scintillator sheet polystyrene base sandwiched by two 200mmx200mmx50mm polystyrene clear plastic blocks
*Background & calibration shoot-throughs (12.5 pC FSR)
* 53cm from lens to sheet
*Pencil beams, 70-110 MeV, 5 MeV steps, at clinical current.
* 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


== Experiment Notes ==
== 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 [https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/data_analysis.pdf here]


Range calorimeter measurements with CMOS sensor + photodiodes.
<!-- ------------------------------------table1------------------------------------------ -->
 
<b> First run </b>
Images from Sensor: '''[http://www.hep.ucl.ac.uk/pbt/wikiData/images/UCLH_Jun2022/Nikon /unix/www/html/pbt/wikiData/images/UCLH_Jun2022/CMOS]'''
{|class="wikitable" style="display: inline-table;"
 
!colspan="4" | With scintillator sheet
Photodiode hexadecimal data: '''/unix/pbt/data/uclh/20220616/DDC232'''
|-
 
!Collimator Size (mm)
{| class="wikitable"
!Exposure (s)
!Run number
!Image
!Beam Energy (MeV)
!Estimated Range (mm)
!Current (nA)
!Spot size (mm, FWHM)
!DDC232 FSR (pC)
!DDC232 Integration Time (us)
!Degrader WET (mm)
!Comments
!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
| 5 || 30 || <div class="image150px" style="text-align: center;">
[https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_1/size_5mm.jpg https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_1/size_5mm.jpg]
</div>
|-
|-
|1 || Background || N/A || N/A || N/A || 300 || 170 || 0 || room light off || N/A || N/A || N/A || N/A
| 7.5 || 20 || <div class="image150px" style="text-align: center;">
[https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_1/size_7-5mm.jpg https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_1/size_7-5mm.jpg]
</div>
|-
|-
|2 || Background || N/A || N/A || N/A || 250 || 170 || 0 || room light off || N/A || N/A || N/A || N/A
| 10 || 15 || <div class="image150px" style="text-align: center;">
[https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_1/size_10mm.jpg https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_1/size_10mm.jpg]
</div>
|-
|-
|3 || Background || N/A || N/A || N/A || 200 || 170 || 0 || room light off || N/A || N/A || N/A || N/A
| 12.5 || 10 || <div class="image150px" style="text-align: center;">
[https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_1/size_12-5mm.jpg https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_1/size_12-5mm.jpg]
</div>
|-
|-
|4 || Background || N/A || N/A || N/A || 150 || 170 || 0 || room light off || N/A || N/A || N/A || N/A
| 15 || 8 || <div class="image150px" style="text-align: center;">
[https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_1/size_15mm.jpg https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_1/size_15mm.jpg]
</div>
|-
|-
|5 || Background || N/A || N/A || N/A || 100 || 170 || 0 || room light off || N/A || N/A || N/A || N/A
| 20 || 8 || <div class="image150px" style="text-align: center;">
[https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_1/size_20mm.jpg https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_1/size_20mm.jpg]
</div>
|-
|-
|6 || Background || N/A || N/A || N/A || 50 || 170 || 0 || room light off || N/A || N/A || N/A || N/A
| 25 || 6 || <div class="image150px" style="text-align: center;">
[https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_1/size_25mm.jpg https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_1/size_25mm.jpg]
</div>
|-
|-
|7 || Background || N/A || N/A || N/A || 12.5 || 170 || 0 || room light off (continued)|| N/A || N/A || N/A || N/A
| 30 || 6 || <div class="image150px" style="text-align: center;">
[https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_1/size_30mm.jpg https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_1/size_30mm.jpg]
</div>
|-
|-
|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
| 35 || 5 || <div class="image150px" style="text-align: center;">
[https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_1/size_35mm.jpg https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_1/size_35mm.jpg]
</div>
|-
|-
|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
| 40 || 4 || <div class="image150px" style="text-align: center;">
[https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_1/size_40mm.jpg https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_1/size_40mm.jpg]
</div>
|-
|-
|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
| 50 || 3 || <div class="image150px" style="text-align: center;">
[https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_1/size_50mm.jpg https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_1/size_50mm.jpg]
</div>
|-
|-
|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
| 60 || 3 || <div class="image150px" style="text-align: center;">
[https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_1/size_60mm.jpg https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_1/size_60mm.jpg]
</div>
|-
|-
|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
 
<!-- ------------------------------------table2------------------------------------------ -->
 
{|class="wikitable" style="display: inline-table;"
!colspan="4" | No scintillator sheet
|-
|-
|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
!Collimator Size (mm)
!Exposure (s)
!Image
!Comments
|-
|-
|14 || 120 || N/A || 60 || N/A || 12.5 || 170 || 0 || 90° gantry; CMOS sensor saturated; || N/A || N/A || N/A || N/A
| 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]
</div>
|| Can see green discolouration caused by previous irradiations. <br> Blocks must have been rotated by 90 when re-assembling
|-
|-
|15 || 120 || N/A || 270 || N/A || 12.5 || 170 || 0 || 90° gantry; CMOS sensor saturated; || N/A || N/A || N/A || N/A
 
<!-- ------------------------------------table3------------------------------------------ -->
 
{|class="wikitable" style="display: inline-table;"
!colspan="4" | With scintillator sheet
|-
|-
|16 || 110 || N/A || 70 || N/A || 12.5 || 170 || 0 || 90° gantry; CMOS sensor saturated; || N/A || N/A || N/A || N/A
!Collimator Size (mm)
!Exposure (s)
!Image
!Comments
|-
|-
|17 || 110 || N/A || 300 || N/A || 12.5 || 170 || 0 || 90° gantry; CMOS sensor saturated; || N/A || N/A || N/A || N/A
| 5 || 30 || <div class="image150px" style="text-align: center;">
[https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_2/size_5mm.jpg https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_2/size_5mm.jpg]
</div>
|-
|-
|18 || 100 || N/A || 90 || N/A || 12.5 || 170 || 0 || 90° gantry; CMOS sensor saturated; || N/A || N/A || N/A || N/A
| 7.5 || 20 || <div class="image150px" style="text-align: center;">
[https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_2/size_7-5mm.jpg https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_2/size_7-5mm.jpg]
</div>
|-
|-
|19 || 100 || N/A || 350 || N/A || 12.5 || 170 || 0 || 90° gantry; CMOS sensor saturated; || N/A || N/A || N/A || N/A
| 10 || 15 || <div class="image150px" style="text-align: center;">
[https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_2/size_10mm.jpg https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_2/size_10mm.jpg]
</div>
|-
|-
|20 || 90 || N/A || 110 || N/A || 12.5 || 170 || 0 || 90° gantry; CMOS sensor fine; || N/A || N/A || N/A || N/A
| 12.5 || 10 || <div class="image150px" style="text-align: center;">
[https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_2/size_12-5mm.jpg https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_2/size_12-5mm.jpg]
</div>
|-
|-
|21 || 90 || N/A || 400 || N/A || 12.5 || 170 || 0 || 90° gantry; CMOS sensor fine; || N/A || N/A || N/A || N/A
| 15 || 8 || <div class="image150px" style="text-align: center;">
[https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_2/size_15mm.jpg https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_2/size_15mm.jpg]
</div>
|-
|-
|22 || 80 || N/A || 500 || N/A || 12.5 || 170 || 0 || 90° gantry; CMOS sensor fine; || N/A || N/A || N/A || N/A
| 20 || 8 || <div class="image150px" style="text-align: center;">
[https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_2/size_20mm.jpg https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_2/size_20mm.jpg]
</div>
|-
|-
|23 || 70 || N/A || 700 || N/A || 12.5 || 170 || 0 || 90° gantry; CMOS sensor fine; || N/A || N/A || N/A || N/A
| 25 || 6 || <div class="image150px" style="text-align: center;">
[https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_2/size_25mm.jpg https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_2/size_25mm.jpg]
</div>
|-
|-
|24 || 130 || N/A || 200 || N/A || 12.5 || 170 || 0 || 90° gantry; CMOS sensor saturated; || N/A || N/A || N/A || N/A
| 30 || 6 || <div class="image150px" style="text-align: center;">
[https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_2/size_30mm.jpg https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_2/size_30mm.jpg]
</div>
|-
|-
|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
| 35 || 5 || <div class="image150px" style="text-align: center;">
[https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_2/size_35mm.jpg https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_2/size_35mm.jpg]
</div>
|-
|-
|26 || 130 || N/A || 200 || N/A || 12.5 || 170 || 0 || 270° gantry; CMOS sensor saturated; || N/A || N/A || N/A || N/A
| 40 || 4 || <div class="image150px" style="text-align: center;">
[https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_2/size_40mm.jpg https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_2/size_40mm.jpg]
</div>
|-
|-
|27 || 120 || N/A || 270 || N/A || 12.5 || 170 || 0 || 270° gantry; CMOS sensor saturated; || N/A || N/A || N/A || N/A
| 50 || 3 || <div class="image150px" style="text-align: center;">
[https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_2/size_50mm.jpg https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/sheet_2/size_50mm.jpg]
</div>
|-
|-
|28 || 110 || N/A || 300 || N/A || 12.5 || 170 || 0 || 270° gantry; CMOS sensor saturated; || N/A || N/A || N/A || N/A
| 60 || 3 || <div class="image150px" style="text-align: center;">
[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>
||
Green discolouration probably from scintillator sheet. <br> Rotated by 90 when re-assembling blocks and sheet
|-
|-
|29 || 100 || N/A || 350 || N/A || 12.5 || 170 || 0 || 270° gantry; CMOS sensor saturated; || N/A || N/A || N/A || N/A
<br>
<b> Second run </b>
<br>
Replaced plastic blocks from first run with new un-irradiated plastic blocks, but using same green scintillator sheet.
<br>
<!-- ------------------------------------table4------------------------------------------ -->
 
{|class="wikitable" style="display: inline-table;"
!colspan="4" | No scintillator sheet
|-
|-
|30 || 90 || N/A || 400 || N/A || 12.5 || 170 || 0 || 270° gantry; CMOS sensor saturated; || N/A || N/A || N/A || N/A
!Collimator Size (mm)
!Exposure (s)
!Image
!Comments
|-
|-
|31 || 80 || N/A || 500 || N/A || 12.5 || 170 || 0 || 270° gantry; CMOS sensor saturated; || N/A || N/A || N/A || N/A
| 5 || 30 || <div class="image150px" style="text-align: center;">
[https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/nosheet_2/size_5mm.jpg https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/nosheet_2/size_5mm.jpg]
</div>
|-
|-
|32 || 70 || N/A || 700 || N/A || 12.5 || 170 || 0 || 270° gantry; CMOS sensor saturated; || N/A || N/A || N/A || N/A
| 7.5 || 20 || <div class="image150px" style="text-align: center;">
[https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/nosheet_2/size_7-5mm.jpg https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/nosheet_2/size_7-5mm.jpg]
</div>
|-
|-
|33 || background || N/A || N/A || N/A || 12.5 || 170 || 0 || RevC onwards; 270° gantry || N/A || N/A || N/A || N/A
| 10 || 15 || <div class="image150px" style="text-align: center;">
[https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/nosheet_2/size_10mm.jpg https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/nosheet_2/size_10mm.jpg]
</div>
|-
|-
|34 || 240 || N/A || 13 || N/A || 12.5 || 170 || 50 || LH shoot through; 270° gantry || N/A || N/A || N/A || N/A
| 12.5 || 10 || <div class="image150px" style="text-align: center;">
[https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/nosheet_2/size_12-5mm.jpg https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/nosheet_2/size_12-5mm.jpg]
</div>
|-
|-
|35 || 240 || N/A || 13 || N/A || 12.5 || 170 || 50 || RH shoot through; 90° gantry || N/A || N/A || N/A || N/A
| 15 || 8 || <div class="image150px" style="text-align: center;">
[https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/nosheet_2/size_15mm.jpg https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/nosheet_2/size_15mm.jpg]
</div>
|-
|-
|36 || 110 || N/A || 300 || N/A || 12.5 || 170 || 0 || 90° gantry; || N/A || N/A || N/A || N/A
| 20 || 8 || <div class="image150px" style="text-align: center;">
[https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/nosheet_2/size_20mm.jpg https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/nosheet_2/size_20mm.jpg]
</div>
|-
|-
|37 || 105 || N/A || 350 || N/A || 12.5 || 170 || 0 || 90° gantry; || N/A || N/A || N/A || N/A
| 25 || 6 || <div class="image150px" style="text-align: center;">
[https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/nosheet_2/size_25mm.jpg https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/nosheet_2/size_25mm.jpg]
</div>
|-
|-
|38 || 100 || N/A || 350 || N/A || 12.5 || 170 || 0 || 90° gantry; || N/A || N/A || N/A || N/A
| 30 || 6 || <div class="image150px" style="text-align: center;">
[https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/nosheet_2/size_30mm.jpg https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/nosheet_2/size_30mm.jpg]
</div>
|-
|-
|39 || 95 || N/A || 400 || N/A || 12.5 || 170 || 0 || 90° gantry; || N/A || N/A || N/A || N/A
| 35 || 5 || <div class="image150px" style="text-align: center;">
[https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/nosheet_2/size_35mm.jpg https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/nosheet_2/size_35mm.jpg]
</div>
|-
|-
|40 || 90 || N/A || 400 || N/A || 12.5 || 170 || 0 || 90° gantry; || N/A || N/A || N/A || N/A
| 40 || 4 || <div class="image150px" style="text-align: center;">
[https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/nosheet_2/size_40mm.jpg https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/nosheet_2/size_40mm.jpg]
</div>
|-
|-
|41 || 85 || N/A || 500 || N/A || 12.5 || 170 || 0 || 90° gantry; || N/A || N/A || N/A || N/A
| 50 || 3 || <div class="image150px" style="text-align: center;">
[https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/nosheet_2/size_50mm.jpg https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/nosheet_2/size_50mm.jpg]
</div>
|-
|-
|42 || 80 || N/A || 500 || N/A || 12.5 || 170 || 0 || 90° gantry; || N/A || N/A || N/A || N/A
| 60 || 3 || <div class="image150px" style="text-align: center;">
[https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/nosheet_2/size_60mm.jpg https://www.hep.ucl.ac.uk/pbt/wikiData/images/Cyberknife_Birmingham_Jul2022/nosheet_2/size_60mm.jpg]
</div>
|-
|-
|43 || 75 || N/A || 700 || N/A || 12.5 || 170 || 0 || 90° gantry; || N/A || N/A || N/A || N/A
 
|-
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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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