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Investigation of dose reduction in neonatal radiography using specially designed phantoms and LiF:Mg,Cu,P TLDs

¹ Newcastle Mater Misericordiae Hospital, Department of Radiation Oncology, Waratah NSW 2298, ² University of Newcastle, School of Mathematical and Physical Sciences (Physics) Callaghan NSW 2308 and ³ University of Newcastle, School of Health Sciences (Medical Radiation Science), Callaghan NSW 2308, Australia

View larger version (47K): [in a new window]   Figure 1. Schematic drawing showing the dimensions of the small neonate phantom and lung insert used in this study. Thermoluminescence dosimeter (TLD) recesses are 1 cm apart.

View larger version (18K): [in a new window]   Figure 2. Simplified diagram showing the top view of a specially-constructed neonate phantom and the two collimation techniques. The region of overlap with Technique 1 is shown by cross-hatching (a) Diverging lines from the radiation source () represent beam divergence. Circles along the long axis of the phantom represent recesses on the phantom surface that hold thermoluminescence dosimeters. FFD, focus–film distance.

View larger version (27K): [in a new window]   Figure 3. Dose profile along the longitudinal axis of the small neonate phantom (10 cm long) from six thermoluminescence dosimeter positions (five positions at 3 cm depth). Data is given for Techniques 1 and 2 at 54 kVp. Dotted line delineates centre of single field. Region of field overlap for Technique 1 (limits of 10 cm x 10 cm fields) is also shown.