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B-0139 - Effective dose comparison between fixed tube current FTC and automatic tube current ATC methods for abdominal CT examinations

M. Alrowily, A. England, P. Hogg; Manchester/UK Type: Scientific Paper
Area of Interests: Radioprotection / Radiation dose, Radiation physics, Abdomen
Imaging Technique: CT
Procedure: Dosimetry
Special Focus: Dosimetric comparison
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Purpose: There has been an increasing use of abdominal CT scans in recent years contributing to an increase in radiation dose to patients. Abdominal CT scans generally require higher exposure factors compared with other regions that are scanned, this drives a need to reduce dose generally and particularly fo[...]

Methods and materials: Using a Toshiba Aquilion 16 CT scanner (120 kVp, 0.5 seconds tube rotation) an adult ATOM dosimetry phantom was exposed to a series of FTC and ATCM CT protocols (27 in total) for each techniques with variations in tube current (FTC: 100, 200 and 250mA; ATCM: Standard [SD 5.00], Low dose [SD 7.50], L[...]

Results: To compare the radiation dose between ATCM and FTC techniques, the corresponding mA values were used.  As previously discussed, the purpose of an ATCM system is to change the tube current across different locations within the scan volume.  To understand and compare this process, the mA val[...]

Conclusion: During abdominal CT scanning, the average E reduced during FTC more than that during ATCM techniques at 250mA. Similarly, lower E dose was achieved at FTC for both fast pitch factors (1.438) and 0.5×16mm detector configurations [both MOSFETs and DLP methods]. However, a lower average E was recorded [...]

Personal information: M Alrowily is a PhD student at the University of Salford. A England is a Senior Lecturer at the University of Salford.   P Hogg is Professor of Radiography at the University of Salford. 

References: Kulama, E. (2004). Scanning protocols for multislice CT scanners. British journal of radiology,    77(Special Issue 1). Toshiba. (2014). Manual Toshiba Ct Aquilion One User. Link http://www.beritakamu.com/manual-toshiba-ct-aquilion-one-user.pdf CIRS (2013), Computerized Imaging Re[...]

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