Ultrasound tomography imaging of radiation dose distributions in polymer gel dosimeters

preliminary study

Melissa L. Mather, Clive Baldock

Research output: Contribution to journalArticle

58 Citations (Scopus)


A novel imaging system for investigation of absorbed dose distributions in radiotherapy polymer gel dosimeters using ultrasound is introduced. A prototype transmission ultrasound computed tomography (UCT) imaging system is developed and evaluated. The imaging capabilities of the system are assessed through investigation of an irradiated polyacrylamide gel test phantom. Images based on transmitted signal amplitude and time of flight (TOF) of the ultrasonic signal through the phantom are reconstructed using a filtered backprojection technique. In general, the reconstruction of the square field in the TOF image was superior to the transmission image, however, transmission images displayed superior contrast to TOF images. The image quality achieved with this prototype system is promising and could be significantly enhanced through improvements, in particular through the development of more sophisticated experimental equipment. It is concluded that UCT is a viable technique for imaging absorbed dose distributions in polymer gel dosimeters and investigations are continuing to further improve the system.
Original languageEnglish
Pages (from-to)2140-2148
Number of pages9
JournalMedical Physics
Issue number8
Publication statusPublished - 2003
Externally publishedYes


  • Polymer gel dosimeter
  • Tomography
  • Ultrasound

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