MINI MRI PROGRESS REPORT

1
MINI MRI PROGRESSREPORT
2
What Works

• LabView Control Interface
• FPGA Interface
• Physical Setup (Cage, Base, Mounting)
• RF and gradient coils

3
LabView

• LabView Works!
• Timing synchronized (within bounds).
• Digital IO with FPGA.
• Pattern generation signal processing.
• May need a new DIO board.

4
The FPGA

• THE FPGA WORKS!!!!
• It accepts data serially from LABView and routes
  it to the appropriate pins.
• Problems overcome
• Improper software modules
• Clocking
• Crosstalk
• Pin-out maps
• Non-robust design software

5
What Needs Work

• Transmitter
• Receiver
• Power Amplifier
• Stage Controller

6
PC Board

• Voltage Regulator works
• 2.5 MHz LPF works
• Amps only give up to 15dB of gain
• Attenuators only give up to 10dB of attenuation
• Filters around 42 MHz are not providing
  sufficient bandpass filtering
• Mixers produces extra side lobes

7
Filters Schematics and Simulations
Low pass 2.5 MHz
Low pass 43 MHz
High pass 41 MHz
8
Power Amplifier

• Ground is actually 120 volts! (RMS)
• Damaged the digital IO board.
• Needs a new wall plug to prevent accidents.

9
Newmark Status

• Control board returned to manufacturer and
  repaired under warranty
• Control board responds to data requests but wont
  drive the motors
• Possible damage to the driver circuits and/or the
  motors themselves

10
Recommendations

• Use Eagle for layout
• Focus project more on signal processing portions
  of MRI
• Recommend two of ECEn 443, 460, 487
• Buy an impedance analyzer