Voxel Near-isotropic

Subsequently, the same authors took advantage of the faster data acquisition provided by MDCT and demonstrated better bowel distension and fewer respiratory artefacts with a beam collimation (5.0 mm) and an effective radiation dose (4.7 mSv for men 6.7 mSv for women) comparable to those of SSCT (Kara et al. 2001). A different proposed approach was to use a thin (i.e., 1.0 mm) beam collimation protocol to obtain images with near isotropic voxels, but simultaneously decrease the effective mAs to 50 in order to keep the effective radiation dose to a level comparable to that of SSCT (5.0 mSv for men and 7.8 mSv for women) (Macari et al. 2002). Such a protocol provided excellent sensitivity for detection... 

Figure 6.17 illustrates reciprocal current injection by a small contact area PU electrode into an infinite volume of homogeneous and isotropic material with uniform current density [,(,. From the reciprocally excited PU electrode, the current spreads out in a hemispheric symmetrical geometry in accordance with Figure 6.1. The reciprocal current density near the electrode is very high, and one may be led to believe that the sensitivity is high in this zone. The voxels lying in the vertical line from the PU electrode have zero sensitivity because the reciprocal current hue is perpendicular to the horizontal current lines. Near the surface, the dot product is very high near the PU electrode.

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