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Beamwidth Profiling Devices

Beamwidth Profiling Devices. TRUS-Bridge Phantom. Beamwidth for one lateral position Rubber membrane 45° inclined surface to the beam Side walls and screw holes Compatible with all commercial steppers. Beamwidth for multiple lateral positions 13 Nylon wires, with respect to grid

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Beamwidth Profiling Devices

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  1. Beamwidth Profiling Devices TRUS-Bridge Phantom • Beamwidth for one lateral position • Rubber membrane • 45° inclined surface to the beam • Side walls and screw holes • Compatible with all commercial steppers • Beamwidth for multiple lateral positions • 13 Nylon wires, with respect to grid • Smaller thickness than rubber membrane • Compatible with all commercial steppers

  2. Beam Profiling Experimental Setup • TRUS images acquired for every depth and manually segmented • Experimented with the SonixTouch US machine • US beam profile is generated

  3. TRUS Beam Profile R=Rectum PZ= Peripheral Zone U=Urethra TZ=Transitional Zone TZ U PZ R • Section-thickness starts diverging after the focal zone • Focal zone is closely located to the US transducer Figure: http://www.keyholeurology.co.uk/prostatecancer.html

  4. Needle Localization Measurement Needle localization of main beam Needle Localization of main and side lobe beams • Compare the observed reflections to a reference point • Ref. point=first inserted needle reflection on a column

  5. Needle Insertion Experimental Setup • Brachytherapy stepper and grid template are in submerged distilled water-glycerol bath • Experimented with the SonixTouch US machine • For each needle, the stepper position where the first reflection appears is recorded

  6. Needle Localization Offset • Average and std. of N(j)-N(1) for gain=0%, dynamic range= 15, 50 and 100 dB, and power=0,-4, and -7 • Beam converges to a point and diverges right after • Beam has a focal zone

  7. Needle Localization Offset • Average and std. of N(j)-N(1) for gain=0%, dynamic range= 15, 50 and 100 dB, and power=0,-4, and -7 • Beam converges to a point and diverges right after • Beam has a focal zone

  8. Side Lobe Effects Intensity profile of main beam Intensity profile of main and side lobe beams • Group of thin, parallel, low intensity bands on both sides corresponding to side lobes

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