TO.CTDI plus has been designed in accordance with standards: IEC 61223-3-5 IEC 61223-3-6 IEC 60601-2-44 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¡ã interval, centred 10mm from the edge of the cylinder. T
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