RTI CT Dose Profiler


RTI CT Dose Profiler probe for use with Piranha, Cobia FLEX, or Cobia SENSE (with PC com). Used for the evaluation of CT and CBCT systems. The probe fits into standard phantoms used for CTDI measurements.

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A pioneer of measuring CT Dose

One-shot accuracy
The RTI CT Dose Profiler has taken the CT quality assurance to the next level. Because of its revolutionary design, it has transformed CTDI measurement from being inaccurate, due to underestimation of the dose for wide beams, to becoming more exact. It also has the ability to further analyze the result – all in one shot!

The rapid advancements in CT technology are placing new demands on methods and equipment used for quality assurance. The wide beams of modern CT scanners make it difficult to use existing CT ionization chambers to measure the total dose given to the patient. Using a standard 10 cm CT ionization chamber may result in inaccurate measurements due to the underestimation of the dose profile for wide beams. The CT Dose Profiler was developed to solve this problem.

The dose is measured at every point of the X-ray beam and the total dose profile is acquired regardless of how wide the beam is. There is no limitation of the beamwidth. This makes it possible to measure without the drawbacks of traditional CT probes.

With the CT Dose Profiler, yous can avoid more expensive methods that require both preparations before and read-out after each scan (like TLD and X-ray film). The CT Dose Profiler is also ideal for measuring point dose and dose rate in the CT beam.

The CT Dose Profiler is based on solid-state technology. It is robust and it fits into existing standard phantoms used for CTDI measurements.

Following parameters are achieved from a single exposure:

  • CTDI(100)
  • Point Dose
  • CT dose profile
  • CTDI(w)
  • CTDI(vol)
  • DLP
  • Performance of the AEC
  • FWHM (Full Width at Half Maximum of the dose profile)
  • Geometric efficiency

All parameters presented with high resolution and accuracy.

General specifications

  • Length
    210 mm
  • Diameter
    12.5 mm
  • Weight
    50 g
  • Sensor width
    250 μm
  • Cable length
    4.0 m (13.1 ft)

Specifications with Piranha

  • Dose rate range
    67 nGy/s-2.2 Gy/s. 0.46 mR/min - 15000 R/min
  • Inaccuracy
    ±5 % or ±15 nGy/s
  • Spatial resolution
    0.25 mm

Specifications with Cobia FLEX/SENSE

  • Dose rate
    3.3 µGy/s to 3.3 Gy/s. 23 mR/min-23 kR/min
  • Inaccuracy
    ±5 % or ±0.4 µGy/s
  • Spatial resolution
    0.25 mm