Microwave Induced Thermoacoustic Tomography Part IV

1
Microwave Induced Thermoacoustic TomographyPart
IV

• By Zaid Al-Husseini

2
Sections

• Improving Contrast
• Transducer Array Info
• Referenced Articles
• Conclusion

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Improving Contrast

• Using Gain compensation to counteract microwave
  attenuation improves image contrast.
• Using low pulse width of microwave radiation and
  ultrasonic transducer bandwidth
• This should be approximately T lt 1 msec to
  achieve millimeter spatial resolution
• The Ultra sound transducer should have a high
  freq. cut off 1/1 microsec, (1 MHz)
• The lateral resolution can be improved using
  focused ultrasonic transducer
• Using lower frequencies for deeper penetration

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Transducer Array Info.
5
Referenced Articles

• Title Imaging of small vessels using
  photoacoustics An in vivo study
• Author(s) Siphanto RI, Kolkman RGM, Huisjes A,
  Pilatou MC, de Mul FFM, Steenbergen W, van
  Adrichem LNA
• Source LASERS IN SURGERY AND MEDICINE 35 (5)
  354-362 2004
• Reference Kruger RA (Thermoacoustic computed
  tomography using a conventional linear transducer
  array )
• UNIVERSITY MEDICAL CENTER ROTERDAMN (Dept. of
  Plastic Surgery), The Netherlands
• University of Twente Biophyisical engineering,
  The Netherlands
• Title Thermoacoustic tomography - consistency
  conditions and the partial scan problem
• Author(s) Patch SK
• Source PHYSICS IN MEDICINE AND BIOLOGY 49 (11)
  2305-2315 JUN 7 2004
• Reference Kruger (Breast Cancer in Vivo)
• Language English
• Applied Science Lab, GE Medical Systems
  Milowakee,WI

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More Referenced Articles

• Title Microwave-induced thermal imaging of
  tissue dielectric properties
• Author(s) Shi Y, Witte RS, Milas SM, Neiss JH,
  Chen XC, Cain CA, O'Donnell M
• Source ULTRASONIC IMAGING 25 (2) 109-121 APR
  2003
• Reference Lihong Wang (Microwavebilogical
  tissues)
• Univ Michigan, Dept Biomed Engn, Ann Arbor, MI
• Title Exact frequency-domain reconstruction for
  thermoacoustic tomography - I Planar geometry
• Author(s) Xu Y, Feng DZ, Wang LHV
• Reference Lihong Wang (Microwavesynthetic
  aperture)
• Texas AM Univ, Opt Imaging Lab, Dept Biomed
  Engn, 3120 TAMU, College Stn, TX
• Title Thermoacoustic computed tomography with
  large planar receivers
• Author(s) Haltmeier M, Scherzer O, Burgholzer
  P, Paltauf G
• Source INVERSE PROBLEMS 20 (5) 1663-1673 OCT
  2004
• Innsbruck Univ, Dept Comp Sci, Technikerstr 25,
  Innsbruck, A-6020 Austria

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Conclusion

• There were many Wang et al experiments on this
  (Texas AM), pretty advanced.
• Not many people doing this research.
• Use Gain compensation to improve contrast
• Demo equipment is cheaper (around 7000 dollar,
  Acuson)
• Cary, NC they have a center (Acuson)
• Other good companies RDtech, Druck.com