CT-guided lung biopsy: Assessment of fiducials registration accuracy

CT-guided interventions have been widely used in lung biopsy procedures to minimize invasion and to improve biopsy accuracy. The basic mathematical statement of the point-based registration problem remains the same in most applications, whereas there are variations on the size and shape of the fiducial markers. In this paper, we measured registration error FLE_p and TRE respectively using two types of fiducial markers, ectrocardiograph electrode and steel bead. The TRE using ECG electrodes is lower than using steel beads. These experimental findings of registration accuracy indicate that ECG electrodes as fiducial markers can be accepted in the lung biopsy.