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Keywords:
Radiation safety, CT-Angiography, Radioprotection / Radiation dose, Dosimetric comparison
Authors:
K. Bates, A. K. Tootell, A. England, K. Szczepura; Salford, Manchester/UK
DOI:
10.1594/ecr2016/C-2394
Methods and materials
Phantom breast tissue was made using a gelatin/water mix,
3 volumes were made to create different size phantoms (Table 1).
An anthropomorphic multipurpose chest phantom “Lungman” was used as the employee in this study as this is an accurate life size modal of a human torso and the soft tissue and bone structures are closest to those of human tissue [6].
To vary chest size,
front and back chest plates were added in different combinations (Table 1)
The Lungman phantom was positioned to represent an average female height of 161.9cm [7].
The lead rubber apron used in the study was a MAVIG Comfortex lead apron in a size medium. According to their catalogue the medium size is recommended for chest size 103-110cm [8].
The phantom was placed into the CT room facing the CT table,
0.5m from the gantry and approximately 0.6m from the isocentre [9] with the left axillary region parallel with the front of the CT scanner (Fig. 1). According to Joemai et al [1] this is the position generally adopted during CT Fluoroscopy.
Dose rate was measured for each phantom combination,
with the apron closed,
apron open,
and no apron.
Measurements were repeated three times in order for the average dose rate reading to be calculated.