Abstract
Appropriate patient centering is of pivotal importance in CT scanning. Without good centering there can be increase in patient radiation dose and loss of image quality, effects that are especially pronounced with use of automatic exposure control techniques. This chapter discusses implications of off-centering of patients during CT scanning.
I have expressed some ideas that point to the center; I have saluted the dawn in my way, from my point of view. He who knows the way should do the same, in his way, and from his point of view.
Friedrich Von Schlegel.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Aviles Lucas P, Dance DR, Castellano IA, Vano E (2004) Monte Carlo simulations in CT for the study of the surface air kerma and energy imparted to phantoms of varying size and position. Phys Med Biol 49:1439–1454
Frush DP (2003) Responsible use of CT. Radiology 229:289–291
Gudjonsdottir J, Svensson JR, Campling S, Brennan PC, Jonsdottir B (2009) Efficient use of automatic exposure control systems in computed tomography requires correct patient positioning. Acta Radiol 50:1035–1041
Kalra MK, Maher MM, Saini S (2003) What is the optimum position of arms for acquiring scout images for whole-body CT with automatic tube current modulation? Am J Roentgenol 181:596–597
Kalra MK, Maher MM, Toth TL, Hamberg LM, Blake MA, Shepard JA et al (2004a) Strategies for CT radiation dose optimization. Radiology 230:619–628
Kalra MK, Maher MM, Toth TL, Schmidt B, Westerman BL, Morgan HT et al (2004b) Techniques and applications of automatic tube current modulation for CT. Radiology 233:649–657
Kalra MK, Maher MM, Toth TL, Kamath RS, Halpern EF, Saini S (2004c) Comparison of Z-axis automatic tube current modulation technique with fixed tube current CT scanning of abdomen and pelvis. Radiology 232:347–353
Kalra MK, Maher MM, Kamath RS, Horiuchi T, Toth TL, Halpern EF et al (2004d) Sixteen-detector row CT of abdomen and pelvis: study for optimization of Z-axis modulation technique performed in 153 patients. Radiology 233:241–249
Kim M, Singh S, Halpern E, Kalra MK. Relation between patient centering, mean CT numbers and noise in abdominal CT: Influence of anthropomorphic parameters. World J Radiology (in press)
Li J, Toth TL, Udayasankar U, Seamans J, Small WC, Kalra MK (2006) Automatic patient centering for MDCT: Effect on radiation dose. scientific paper at ARRS, Vancouver, Canada (in press)
Li J, Toth TL, Udayasankar U, Seamans J, Small WC, Kalra MK (2007) Automatic patient centering for MDCT: Effect on radiation dose. Am J Roentgenol 188:547–552
Li J, Udayasankar UK, Toth TL, Small WC, Kalra MK (2008) Application of automatic vertical positioning software to reduce radiation exposure in multidetector row computed tomography of the chest. Invest Radiol 43:447–452
Mayo JR, Aldrich J, Muller NL (2003) Fleischner Society Radiation exposure at chest CT: a statement of the Fleischner Society. Radiology 228:15–21
Mulkens TH, Bellinck P, Baeyaert M, Ghysen D, Van Dijck X, Mussen E et al (2005) Use of an automatic exposure control mechanism for dose optimization in multi-detector row CT examinations: clinical evaluation. Radiology 237:213–223
Matsubara K, Koshida K, Ichikawa K et al (2009) Misoperation of CT automatic tube current modulation systems with inappropriate patient centering: phantom studies. Am J Roentgenol 192:862–865
Namasivayam S, Kalra MK, Mittal P, Small WC (2006) Can radiation exposure associated with Abdominal and/or Pelvic CT be minimized with better practice? Initial results. scientific paper at ARRS, Vancouver, Canada (in press)
Toth TL, Cesmelia E, Ikhlef A, Horiuchi T (2006) Image quality and dose optimization using novel X-ray source filters tailored to patient size. In: Proceedings of SPIE 2005;5745:283-91 http://spiedl.aip.org/dbt/dbt.jsp?KEY=SISDG&Volume=5745&Issue=1&bproc=year&scode=2005. Accessed 16 Mar 2006)
Toth T, Ge Z, Daly MP (2007) The influence of patient centering on CT dose and image noise. Med Phys 34:3093–3101
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2011 Springer-Verlag Berlin Heidelberg
About this chapter
Cite this chapter
Kalra, M.K., Toth, T.L. (2011). Patient Centering in MDCT: Dose Effects. In: Tack, D., Kalra, M., Gevenois, P. (eds) Radiation Dose from Multidetector CT. Medical Radiology(). Springer, Berlin, Heidelberg. https://doi.org/10.1007/174_2011_447
Download citation
DOI: https://doi.org/10.1007/174_2011_447
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-24534-3
Online ISBN: 978-3-642-24535-0
eBook Packages: MedicineMedicine (R0)