Radiation Dosimetry Descriptors Applied to Four C T Scanners in New Zealand

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Abstract
Doses to patients have been estimated for the four New Zealand CT Scanners, in terms of recently proposed dose descriptors. These descrip‐tors were computed tomography dose index (CTDI), multiple scan average dose (MSAD), “equivalent rectangular width (w), a figure of merit, and integral dose. X‐ray beam dose profiles, half‐value‐layer and peak kilovoltage were also determined. Dosimetry was by thermoluminescent dosimeters, pencil ionization chamber, and x‐ray films, in cylindrical solid perspex phantoms. The four scanners were all found to give comparable doses to patients.