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British Journal of Radiology (2006) 79, 56-61
© 2006 British Institute of Radiology
doi: 10.1259/bjr/39775216
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Comparison of patient doses in 256-slice CT and 16-slice CT scanners

S Mori, MS, RT, MPR 1,2 M Endo, PhD, MPH 1 K Nishizawa, PhD, MPH 1 K Murase, PhD, MPH 2 H Fujiwara, PhD 2 and S Tanada, MD 3

1 Department of Medical Physics, National Institute of Radiological Sciences, Chiba 263-8555, Japan, 2 School of Allied Health Sciences, Faculty of Medicine, Osaka University, Osaka 565-0871, Japan and 3 Department of Medical Imaging, National Institute of Radiological Sciences, Chiba 263-8555, Japan


Figure 1
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  		Figure 1. (a) Front view of 256-slice CT-scanner. (b) A wide-area 2D detector is designed on the basis of the present CT technology and mounted on the gantry frame of the state-of-the-art CT-scanner.

 

Figure 2
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  		Figure 2. Clinical images. (a) The 0.5 mm isotropic normal anatomy images of auditory ossicles in sagittal section. (b) 3D visualization of the chest with four contiguous scans. (c) Normal anatomy images of abdomen (0.63 mm reconstruction increment). (d) Coronal image (0.63 mm reconstruction increment) of pelvis with three contiguous scans.

 

Figure 3
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  		Figure A1. Reconstruction geometry of cone-beam CT. An X-ray source and a 2D detector rotate around the z-axis. The volume that can be reconstructed with the Feldkamp algorithm is shown by the shaded region and is a double conical region within a cylinder of radius Rmax, which is determined by the detector size in the x-direction and shows the maximum field of view in the transverse plane. R and H show diameter and height, respectively, of a cylindrical reconstructed volume as it varied with an object. N x T show the nominal beam width where N is the number of slice and T is the slice collimation.

 




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