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C-1090 - Usefulness of iterative reconstruction algorithms for low-dose breast CT

M. Nishiura1, I. Yamaguchi1, Y. Ogata1, K. Murase2; 1 Sakai/JP 2 Siuita/JP Type: Scientific Exhibit
Area of Interest: Breast
Imaging Technique: CT
Procedures: Physics, Dosimetry, CAD
Special Focus: Cancer
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Aims and objectives: Background The 2007 recommendations of the International Commission on Radiological Protection (ICRP) stated that the breast tissue weighting factors have been increased from 0.05 to 0.12 in light of recent epidemiological findings and the focus on cancer incidence in detriment calculations [1]. The[...]

Methods and materials: CT protocol This study was performed with a 16-detector row CT scanner (Aquilion Lightning; Toshiba Medical Systems, Tochigi, Japan). Control images were obtained via scanning at 120 kVp and 120 mA, with a 1.0 s gantry rotation time (120 mAs), 16 × 0.5 mm collimation, 400 mm field of view, and 1.44 [...]

Results: The air kerma of the experimental image per rotation of the X-ray tube significantly decreased at both 80 and 60 mAs as compared to the control experiments (p < 0.05) (Fig. 4). The CTDIvol for all experimental groups other than that at 80 mAs and with a PF of 0.94 decreased more than in the contr[...]

Conclusion: Discussions This study evaluates whether radiation exposure dose during CT breast scans can be reduced with IR algorithms and image quality improvements compared with scans taken at standard parameters (120 kVp and 120 mAs with a PF of 1.44). In this study, we adopted AIDR 3D, which is an IR techn[...]

Personal information: Thank you for your visiting my presentation!   Motoko NISHIURA1),2)   Isao YAMAGUCHI1) Yuji OGATA1) Kenya MURASE2)   1) Faculty of Health Sciences, Butsuryo College of Osaka, 4-410-5 Otori higashi, Nishiku, Sakai, Osaka, 593-8328, Japan 2) Department of Medical Physics and Engineering[...]

References: [1] A. D. Wrixon, "New ICRP recommendations," J Radiol Prot, vol. 28, no. 2, pp. 161-8, Jun 2008.   [2] H. Mumtaz et al., "Staging of symptomatic primary breast cancer with MR imaging," AJR Am J Roentgenol, vol. 169, no. 2, pp. 417-24, Aug 1997.   [3] T. Hata et al., "Magnetic resonance im[...]

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