Abstract：
BACKGROUND:CT optimization has a special importance in children. Smaller body size accentuates the importance of patient positioning affecting both radiation dose and image quality. OBJECTIVE:To determine the effect of vertical positioning on organ dose, image noise and contrast in pediatric chest CT examination. MATERIALS AND METHODS:Chest scans of a pediatric 5-year anthropomorphic phantom were performed in different vertical positions (-6 cm to +5.4 cm) with a 64-slice CT scanner. Organ doses were measured with metal-oxide-semiconductor field-effect transistor (MOSFET) dosimeters. Image noise and contrast were determined from the CT number histograms corresponding to different tissues. RESULTS:Significant changes in organ doses resulting from vertical positioning were observed, especially in radiosensitive anterior organs. The breast dose increased up to 16% and the thyroid dose up to 24% in lower positions. The noise was increased up to 45% relative to the centre position in the highest and lowest vertical positions, with a particular increase observed on the anterior and posterior sides, respectively. Off-centering also affected measured image contrast. CONCLUSION:Vertical off-centering markedly affects organ doses and measured image-quality parameters in pediatric chest CT examination. Special attention should be given to correct patient centering when preparing patients for CT scans, especially when imaging children.
journal_name
Pediatr Radioljournal_title
Pediatric radiologyauthors
Kaasalainen T,Palmu K,Lampinen A,Kortesniemi Mdoi
10.1007/s00247-012-2611-zsubject
Has Abstractpub_date
2013-06-01 00:00:00pages
673-84issue
6eissn
0301-0449issn
1432-1998journal_volume
43pub_type
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