QUART nonius

Electronic X-Ray Ruler for Field and Fan-Beam Measurement

The QUART nonius is an easy-to-use and very sophisticated measuring instrument to verify size and geometrical properties of x-ray fields. It can also be used to analyse characteristics of fanned x-ray beams as used in CT or dental panoramic x-ray. The QUART nonius is incredibly flexible: it can be used for digital as well as conventional x-ray modalities. In any case, its precision is an absolute strong point – as it goes down into to the so-called nonius range of 0.1mm!

Digitisation in x-ray technology makes traditional screen-films less available. Originally, they were used for checks on x-ray beam properties. Today, the QUART nonius performs the same task. And it provides even more substantial features.

The QUART nonius can be used to verify if the light visor matches the actual x-ray field. In addition, the nonius provides the option to assess the position and width as well as the dose profile of fanned x-ray beams. For that purpose, it features markings to line-up the light field or positioning lasers.

Recent studies have proven that QUART nonius can also be used for field measurement in radiation therapy applications.*

Technical Specifications

Mode of Operation

  • Operating the QUART nonius is easy and straight-forward:
  • 1. Connect the device via USB to a Laptop or Tablet PC (Windows OS required).
  • 2. Position the head unit at the respective position.
  • 3. Use light field or a reference point for alignment.
  • 4. Trigger the QA/QC exposure.
  • 5. Immediately evaluate the results.


  • Accuracy / Resolution: +/- 0.1 mm
  • Exposure Threshold: Dose = 200 µGy / Dose Rate = 20 µGy/s
  • Minimum Exposure: Variable; depends on application
  • Measurement Method: Open measurement – w/o added filtration
  • Connectivity: Standard USB (2.0)
  • Plug and Play Component
  • System Requirements: Pentium III, 128 Mb RAM, min. 1x USB
  • Operating System: Windows 8, 7, Vista, XP
  • Sensor Area: 40 mm Length
  • Radiopaque center marker (Visible in test exposure)
  • Weight: 190 g (without USB Cable)
  • Size of Head Unit: 55 x 75 x 15 mm (W x L x H)