isocentre

Related to isocentre: Isocenter

isocentre

The point on a photograph intersected by the bisector of the angle between the plumbline and the photograph perpendicular.
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In order to adjust the RF pulse's phase to become in-resonance with the flowing spin's accumulated phase, the n RF pulse phase ([PHI]n) should be [PHI]n = [gamma] x n x G x T x Z, where y is the gyromagnetic ratio, G is the average gradient ([approximately equal to]1 mT/m in the labelling plane), T is the spacing of the RF pulses, and Z is the distance from the gradient isocentre to the particular point at which the gradient pulse of the labelling plane is applied.
The median total dose to the isocentre of the prostate was 66 Gy (range: 52.5-70), usually delivered in 2 Gy fractions.
Positioning errors and prostate motion during conformal prostate radiotherapy using on-line isocentre set-up verification and implanted prostate markers.