TO CTDI plus permits the user to measure the dose index for computed tomography systems. The test object consists of three PMMA cylinders, one cylinder represents the paediatric head (100mm diameter), the second the adult head (160mm diameter) and the other represents the body (320mm diameter). The length of each cylinder is 140mm. Each cylinder contains holes large enough to accept a radiation detector, used to take the dose measurements.

There is a hole at the centre of the cylinders and one at each 90° interval, centred 10mm from the edge of the cylinder. This item is available as a nested phantom (the paediatric head phantom fits inside the adult head phantom which fits inside the body phantom).

TO CTDI plus enables the following tests to be made:

  • CTDI100 (centre)
  • CTDI100 (peripheral)
  • CTDIw (weighted CTDI100)
  • CTDIvol (weighted CTDIw)
  • CTDIfree air

TO CTDI plus is heavy and as such is provided in a tough case with wheels and telescopic handle.

Please note: a CTDI holder is now available for suspension of the TO CTDI plus over the couch end.

Specification Sheet