microct
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Table of Contents
µCT
X-Ray Source
PXS5-724EA Microfocus Source
- 20kV-70kV targe voltage
- 0-0.1 mA beam current
- 10µm x 10µm focal spot on tungsten target
- 34° (or 40°) cone angle
- 0.13mm Beryllium windows
Connector
- Chassis Ground
- 4.0V DC kV Control Source
- HV Programming (4.0V = 80kV)
- HV Programming Ground
- Current Programming (2.5V = 100µA)
- Standby Power (+12V DC)
- HV Monitor Voltage (4.0V = 80kV)
- Current Monitor (2.5V = 100µA)
- Monitor Ground
- +2.5V DC mA Control Source
- +12 DC Operate Power
- DC Operate Ground
Mating Connector :
- Backshell: TE 206322-9 (https://www.digikey.de/product-detail/de/206322-9/A33767-ND/1124058/?itemSeq=355818490)
Thoshiba DGO 73
- 65kV
- 8mA beam current
- 700µm x 700µm focal spot
- 2mm Aluminium filter (integrated in tube?)
X-Ray Detector
Dexis Platinum / GXS-700
- SN: 0104430711
- 19.5µm x 19.5µm Pixels
- 1324×1692 Resolution
- Sensor Firmware Version: 0.5.10, 0.3.6, 0.4.5
- CPLD Version: 3.3.0.0
- API Version: 1.0.10.0
- VID 5328 PID 2010
- SN: 1093330312
- 19.5µm x 19.5µm Pixels
- 1552×1040 Resolution
https://nucwiki.org/wiki/index.php/GXS700_FOSS
https://nucwiki.org/wiki/index.php/Gendex_GXS700
DigiPan
- 1244 x 61 pixels
- 104µm pixel pitch
- 12bits per pixel
- 1 Start bit, 1 Control bit (always 1)
https://hackaday.io/project/62710-taking-digital-xray-shots-for-cheap-300
Connector
- (BL) Ground
- (RD) +5V
- (OR) +15V
- (GR) -15V
- (BL) RS422 A
- (WH) RS422 B
Flatpanel Detector
Fluorescent Screen
Mechanics
Rotary Stage
- 0.1° minimum resolution
- AMS AS5147 Magnetic Encoder (On Axis) Datasheet
- Wormgear drive (AliExpress
- 29.5mm Center Distance
- ~50mm gear diameter
Source & Detector
- Distances must be known
- Source - Center of Rotation (SOD - Source Object Distance)
- Center of Rotation - Detector (ODD - Object Detector Distance)
- Source - Detector (SDD - Source Detector Distance)
Reconstruction
Correction
Convert x-ray images to projections:
p(s) = -ln(I(s) / I(0))
p(s) : Projected Intensity I(s) : Intensity recorded at detector after passing through an object I(0) : Intensity at source (white reference)
Filtered Backprojection
microct.1615644482.txt.gz · Last modified: by konstantin