The document discusses ultrasonic transmission tomography using ray interval correction based on echo profiles. It presents research from a 1996 doctoral thesis that used ray interval correction on echo profiles to perform ultrasonic limited-angle tomography on agar phantoms and porcine kidneys. The thesis aimed to improve reconstruction precision in ultrasonic transmission tomography.

1.  Doctor Thesis (1996)
 “Ultrasonic Transmission Tomography Using Ray Interval Correction
Based on Echo Profiles”
Precision Machinery Engineering Dept., Dohi Laboratory
Ray Interval Correction
on Echo Profile
Agar phantom
Complete projections Limited and partial
Porcine kidney
Ultrasonic Limited-Angle
Partial Projections

2. (No GPS...)
Sensors: strap-down inertial unit (accelerometers
& gyros), electronic compass & odometry
Actual trajectory
Trajetória Real x Estimada
Trajetória Real x Estimada
200
3000
2000
Real
Estimada
Ponto de partida
Ckeckpoints
Real
Estimada
Ponto de partida
Ckeckpoints
100
0
-100
coordenada y (m)
coordenada y (m)
1000
0
-200
-300
-400
-1000
-500
-600
-2000
região ampliada
-700
-3000
-1200 -1000 -800
-600
-400 -200
0
200
coordenada x (m)
400
600
800
Reconstruction without sensor fusion
-800
-600
-500
-400
-300
-200
-100
0
coordenada x (m)
100
200
300
400
Reconstruction with sensor fusion

3.  Corrosion assessment on
pipeline internal walls
 Problems:
 noise
 multiple echo overlap
 lateral reflections
Phase-shift encoded pulse signal
Dispersion and lateral reflections of ultrasonic signals on
corroded pipeline wall
Received echo signal
Processed Echo signal

4. Arduino MEGA 256
E-puck Robot
Lasersaur cutter
RepRap 3D printer
Elphel Camera
Computer Systems, Cameras, Amateur Radio, Audio and Music,
Telephony, Machine and Tools, Robotics, ...
http://en.wikipedia.org/wiki/List_of_open-source_hardware_projects

5.  Arduino and shield boards for 3D printer
 3D printer
 Joint work with Faculty of Dentistry, USP
Use of 3D printer on dental filling training