Development of a biplane fluoroscope at the VA Puget Sound William - - PowerPoint PPT Presentation

▶
development of a biplane fluoroscope at the va puget sound
SMART_READER_LITE
LIVE PREVIEW

Development of a biplane fluoroscope at the VA Puget Sound William - - PowerPoint PPT Presentation

Aug 27, 2022 156 likes •531 views

Development of a biplane fluoroscope at the VA Puget Sound William R. Ledoux, Joseph M. Iaquinto, Richard Tsai, Bruce Sangeorzan, Grant Marchelli, Matthew Kindig, Eric Thorhauer, Duane Storti, and David Haynor RR&D Center of Excellence

slide-1
SLIDE 1

Development of a biplane fluoroscope at the VA Puget Sound

William R. Ledoux, Joseph M. Iaquinto, Richard Tsai, Bruce Sangeorzan, Grant Marchelli, Matthew Kindig, Eric Thorhauer, Duane Storti, and David Haynor

RR&D Center of Excellence for Limb Loss Prevention and Prosthetic Engineering, VA Puget Sound Departments of Mechanical Engineering, Radiology, Orthopaedics & Sports Medicine, University of Washington

slide-2
SLIDE 2

Motivation for biplane fluoroscope development

  • CT
  • MRI
  • Retro-reflective markers

Ledoux WR, et al., J Orthop Research, 24, 2006 Fassbind MJ, et al., Journal of Biomechanical Engineering, 133, 2011 Whittaker EC, et al., Gait and Posture, in review 2011

slide-3
SLIDE 3

Bone pins

Arndt et al., 2007

Invasive; not used for routine clinical care

slide-4
SLIDE 4

Fluoroscopy systems

Single plane; exposure to radiation

De Clercq et al., 1994

slide-5
SLIDE 5

Fluoroscopy systems

hindfoot only; exposure to radiation; 3D-2D

Yamaguchi et al., 2009

slide-6
SLIDE 6

Fluoroscopy systems

Portion of stance; exposure to radiation

Caputo et al., 2009 Li et al., 2008

slide-7
SLIDE 7

Biplane fluoroscopy

  • Custom biplane room too expensive

– Henry Ford Hospital, U Pittsburgh, Brown

  • C-arms

– Mass General Hospital, Duke

  • Modify existing C-arms

– Steadman-Philippon Research Institute

  • Hardware:

– Two Philips BV-Pulsera C-arms

  • Software:

– Customized

slide-8
SLIDE 8

Biplane fluoroscopy

slide-9
SLIDE 9

Biplane fluoroscopy

slide-10
SLIDE 10

Biplane fluoroscopy

slide-11
SLIDE 11

X-Ray Source X-Ray Source

Biplane fluoroscopy

slide-12
SLIDE 12

Foot phantom

www.phantomlab.com

slide-13
SLIDE 13

Dynamic data collection

slide-14
SLIDE 14

Biplane fluoroscopy

slide-15
SLIDE 15

Philips BV Pulsera C-Arms

  • Typical hospital C-arm
  • 30 pulses/s or continuous
slide-16
SLIDE 16

Synchronizing systems

slide-17
SLIDE 17

Disassembling C-arms

slide-18
SLIDE 18

Custom mounting devices

slide-19
SLIDE 19

Replacing cameras

slide-20
SLIDE 20

Final floor

slide-21
SLIDE 21

Light sabers?

slide-22
SLIDE 22

Laser alignment

slide-23
SLIDE 23

Customized software

  • Matlab, C/C++, CUDA
  • Phase I: distortion and bias correction,

3D calibration

  • Phase II: generation of digital

reconstructed radiographs (DRRs)

  • Phase III: implementation of similarity

measures and comparison methods

  • Phase IV: speed and memory
  • ptimization
slide-24
SLIDE 24

Distortion correction

slide-25
SLIDE 25

Flat-field correction

slide-26
SLIDE 26

3D Calibration

slide-27
SLIDE 27

3D calibration revised

slide-28
SLIDE 28

Validation: Bead-based

  • Machined block or “wand”

– 1.6mm tantalum beads – measured within 7 microns

  • Wand translated and rotated

via a 1 micron precision stepper-motor (static testing)

  • Wand manually waved

though FOV at ~0.5m/s (dynamic testing)

slide-29
SLIDE 29

Validation: Bead-based, Static

  • Average translational accuracy = 0.0811 mm
  • Average translational precision = ± 0.0103 mm
  • Average rotational accuracy = 0.1541°
  • Average rotation precision = ± 0.1382 °
slide-30
SLIDE 30

Validation: Bead-based, Dynamic

  • Average accuracy = 0.1260 mm
  • Average precision = ± 0.1218 mm
slide-31
SLIDE 31

Validation: Bone-based

  • Bones in foam block

– 1.6mm tantalum beads

  • Block translated and rotated via a 1 micron

precision stepper-motor (static testing)

  • Block manually waved though FOV at ~1 m/s

(dynamic testing)

slide-32
SLIDE 32

Validation: Bone-based, Static

slide-33
SLIDE 33

Sample DRR

slide-34
SLIDE 34

GUI: unoptimized

slide-35
SLIDE 35

GUI: optimized

slide-36
SLIDE 36

Sample videos