Microwave Induced Thermoacoustic Tomography Part VI

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Microwave Induced Thermoacoustic TomographyPart
VI

• By Zaid Al-Husseini

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Sections

• Analog to Digital Converters Info.
• UHF Transducer Amplifiers
• Theoretical Apparatus Design
• Problems Experienced (by Others)
• Conclusion

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Analog to Digital Converters
Includes Data Logging Software, Dual Channel
Strain Gauge Module, Signal Conditioning Box, DAQ
Card Cable, Data Acquisition Board
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UHF Transducer Amplifiers
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Theoretical Apparatus Design
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Problems Experienced (by Others)

• A lot of noise was due to pulse amplifier
• Axial resolution is limited by the temporal width
  of microwave pulse and temporal width of the
  impulse response of UHF Transducer
• Later resolution at the plane is limited by the
  focal diameter of the ultrasonic transducer
• Resolution deterioration due to transducer
  diameter (being large), can be reduced at expense
  of SNR.
• Difficulty in having high penetration (more than
  4 cm) due to poor radio frequency penetration
  values.

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Conclusion

• Equipment seems expensive but better instruments
  will give better resolution.
• What gain values are needed?
• What resolution are we after?
• Some Useful Links
• http//focus.ti.com/analog/docs/analoghomepage.jsp
  ?templateId1navigationId9628familyId2
• http//www.transducertechniques.com/TMO-2.cfm